Why Hollow Bricks Are Used For Construction?

Why Hollow Bricks Are Used For Construction
Cost-Effective: – Weight-wise, hollow bricks are much lighter than the traditional ones. One concrete hollow brick is equivalent to five traditional bricks, thus reducing the construction cost by a big margin. Due to its lightweight, the structural designs also require lesser materials. Not to mention how using them saves both labor costs and labor hours as well.

What is the benefit of hollow bricks?

What Are Hollow Bricks? – Hollow Bricks are the perforated vertically or horizontally and it is more useful than the traditional clay brick. It is very easy to handle on the construction site. It is light in weight and also reduces the time of construction. Hollow bricks are more efficient and also absorb less water or moisture as compared to traditional brick, Why Hollow Bricks Are Used For Construction Hollow Bricks The hollow brick has the property of low absorbing moisture so there is less chance of efflorescence on the surface of the brick. Hollow bricks building is also known as Green building of India because the hollow brick is the eco-friendly one and doesn’t spread any pollution to the environment.

It is made from recycled waste, fly ash, and coal hush. The main objective of the hollow brick is to reduce the self-weight preferably known as a dead load of the structure. It is widely used for the partition of buildings or it can be used as a load-bearing wall as per the strength of the wall. The hollow brick also has the property of thermal insulation so it can be cooled or heated as per the weather conditions which makes it durable.

The thermal insulation property of the hollow brick keeps the internal environment or inside the room cool in the summer and as well as warm in winter. The bonding capacity of hollow is quite good because the concrete is filled in the pores of the hollow brick.

Why hollow blocks are used for construction?

Hollow Concrete Blocks vs. Solid Concrete Blocks – There are two main types of concrete blocks used in the construction industry: hollow and solid. Fully solid blocks are often used for projects like paving, where stability and durability are important.

You wouldn’t want to try walking on pavement full of holes. Hollow blocks, which have holes that take up more than one-quarter (and usually more than half) of their cross-sectional area, are used when building boundary fences and other large structures. The holes make them lighter and can be useful when running wiring or piping through them.

You can also run rebar through the holes for greater stability.

Are hollow bricks stronger than solid?

Brick units generally have higher compressive strengths than other loadbearing masonry materials. This makes hollow brick particularly well-suited for reinforced masonry applications where the increased strength of the unit can allow thinner wall sections to handle the same loading.

Is hollow block strong?

Concrete Masonry Units or CMU are known as hollow concrete blocks, concrete bricks or concrete masonry. Concrete blocks are composed of Portland cement and aggregate, the high density blocks may use sand and gravel while low density blocks use industrial waste instead of aggregate.

They have a uniform size and have two hollow cores within it which make it very light in weight.The cores comprise of air pockets which make it a very good for heat insulation.They are very good for acoustics and sound insulation.They are economical and cost effective.It has a rough texture which allows good bonding between the concrete blocks and the mortar.Good resistance against external weather conditions.The internal walls can have a reduced thickness as it is very strong.It is an ecofriendly material as fly ash can also be used to manufacture these blocks.Cement Masonry Units are fire resistant.

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Does hollow block absorb water?

Nonconventional concrete hollow blocks evaluation by destructive and non-destructive testing – Avaliação de blocos de concreto vazados não convencionais por ensaios não destrutivos e destrutivos M.S. Rodrigues I ; G.C.S. Ferreira II ; L. Shiroma III ; A.L.

  1. Beraldo IV I Agricultural Engineering, State University of Campinas, [email protected], Av.
  2. Candido Rondon, 501, Cidade Universitária Zeferino Vaz, zip code 13083-875, Barão Geraldo, Campinas, São Paulo, Brazil II Faculty of Technology, State University of Campinas, [email protected],
  3. Rua Paschoal Marmo, 1888, zip code 13484-332, Limeira, São Paulo, Brazil III Agricultural Engineering, State University of Campinas, [email protected],

Av. Candido Rondon, 501, Cidade Universitária Zeferino Vaz, zip code 13083-875, Barão Geraldo, Campinas, São Paulo, Brazil IV Agricultural Engineering, State University of Campinas, [email protected], Av. Candido Rondon, 501, Cidade Universitária Zeferino Vaz, zip code 13083-875, Barão Geraldo, Campinas, São Paulo, Brazil ABSTRACT The aim of this study was to evaluate cementitious matrices properties by partial replacement of Portland cement by silica fume (SF) or by rice husk ash (RHA), and their application in nonbearing hollow blocks, tested by destructive and non-destructive methods.

  1. The following mixtures were produced: reference (100% of Portland cement) and Portland cement replacement (10% by mass) with SF or RHA.
  2. The non-destructive testing showed that the highest values of UPV were obtained for SF-based blocks and RHA-based blocks.
  3. The destructive test showed better results for SF-based blocks, but there was no statistical difference between the RHA-based and control ones.

Keywords: concrete hollow blocks, rice husk ash, pozzolan, non-destructive testing. RESUMO O objetivo desse estudo foi o de avaliar as propriedades de matrizes cimentícias com a substituição parcial do cimento Portland por sílica ativa (SA) ou cinza de casca de arroz (CCA) e suas aplicações em blocos de concreto não estruturais, avaliados por métodos destrutivos e não destrutivos.

  • As seguintes misturas foram produzidas: referencia (100% de cimento Portland), e mistura de cimento com SA ou CCA (10% de substituição, em massa).
  • O ensaio não destrutivo mostrou que maiores valores de velocidade do pulso ultra-sônico (VPU) foram dos blocos com SA e com CCA.
  • No ensaio destrutivo, os melhores resultados foram obtidos para os blocos com SA, mas não há diferença estatisticamente significativa entre os blocos com CCA e os blocos controle.

Palavras-chave: blocos de concreto vazados, cinza de casca de arroz, pozolana, ensaio não destrutivo 1. Introduction Concrete hollow blocks applications are common in many countries. However, the manufacture of these blocks does not provide satisfactory technology control due to the need for quick release of the lots.

  • Brazilian and international standards (ABNT NBR6136, ASTM C55-11, BS 6073/81 ) describe hollow blocks compressive test at 28 days old, but this period can be considered long for practical purposes.
  • Therefore, the need for more rapid testing enables the application of non-destructive testing (ultrasound) for materials characterization.

Prassianakis & Prassianakis evaluated the ability of non-destructive testing to determine the integrity of concrete specimens, and they concluded that this methodology is feasible for blocks evaluation. Hamid et al. performed ultrasound tests on high performance concrete (HPC), with the addition of silica fume, on cubic specimens of 150 mm side.

  1. After that, the specimens were tested in compression.
  2. Results confirmed that ultrasonic pulse velocity (UPV) change was more evident between 1 and 14 days and that UPV increases only slightly at older ages (28, 56 and 90 days old).
  3. Moreover, there is an actual need to adopt practices to minimize environmental impacts with the use of admixtures in Portland cement (SNIC ).

The use of ash from agro-industrial and pozzolanic materials allow reducing the Portland cement consumption, thus making cement industry more sustainable. Additionally, cement replacement by ashes also improves the mechanical characteristics and the durability of cementitious matrices.

According to Mehta and Monteiro, the highly reactive pozzolan, even when present in small contents (30%) in a cementitious matrix, is able to consume almost completely calcium hydroxide, thus improving not only the mechanical strength but also the resistance to acid and sulfate attacks. Researchers studied the use of silica fume in concrete, comparing the results of destructive and non-destructive testing (ultrasound).

They observed that the mixtures with higher percentage of silica fume (30%) had smaller UPV when compared with mixtures with 10% and 20% silica fume. This can be justified because, with silica fume utilization, concrete becomes less dense, despite showing the same compressive strength (Hamid ).

Cement-based materials are heterogeneous mixtures, and the evolution of its strength over time is not properly understood. However, the use of non-destructive methods, such as the ultrasound monitoring of structural changes, could be a quick and efficient way to predict material behavior (Beraldo, Teixeira, Beraldo ).

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The aim of this study was to evaluate cementitious matrices properties by partial replacement of Portland cement with SF or RHA, and to analyze their applications in nonbearing hollow blocks, tested by destructive and non-destructive methods.2. Materials and experimental program 2.1 Raw materials It was employed a residual rice husk ash (RHA), obtained by non-controlled burning process in rice industry located in São Paulo State, Brazil.

Silica fume (SF) was used as reference. These residues were used without any treatment. Concrete hollow blocks were manufactured with ordinary Portland cement (CPV-ARI-40, according to Brazilian standard NBR 5733 ), natural sand, gravel and a plasticizer additive.2.2 Chemical and physical characterization of RHA and SF The chemical composition of residues was determined by X-ray fluorescence (XRF), and the loss on ignition (LOI) was determined by ASTM C-114,

Mineralogical characterization of the ashes was carried out by X-ray diffractions. Granulometric size distributions of ashes were performed using a Malvern Mastersizer 2000 apparatus, which allows an analysis of particles by laser diffraction from 0.02 to 2000 µm, in liquid mode as dispersant, with 10% – 15% of obscuration and ultrasonic agitation during 60 s.2.3 Pozzolanic activity evaluation by electrical conductivity The development of the reaction of pozzolan/calcium hydroxide produces insoluble products, therefore the concentration of CH in the solution decreases.

  • The decrease of Ca2+ ions due to the increase phase of CSH (calcium silicate hydrate) produces a decrease in conductivity, which rate depends if the reactivity of the pozzolan is higher or lower (Villar-Cociña ).
  • Several authors (Luxán, Tashiro, Payá ) applied the electrical conductivity test to evaluate the pozzolanic activity of a material.

This test involves taking measurements of the electrical conductivity of a solution of calcium hydroxide and pozzolan, or those of RHA. Thus, a qualitative analysis is obtained by means of an electrical conductivity curve as a function of the time for RHA and for SF.

It was added 200 mg of Ca (OH)2 in deionized water to obtain an unsaturated solution, at 60 °C. After stabilization of the solution’s conductivity, it was placed 5.25 g of ash into the solution, and electrical conductivity was obtained. Conductivity values were collected every 20 s, and the test duration was 24 h.2.4 Concrete hollow blocks manufacturing For the hollow blocks production, three difference mixtures were employed: a control (100% of Portland cement), blocks with RHA and blocks with SF.

The percentage of replacement of Portland cement by ashes was 10%. The ratios used in mixtures are presented in Table 1, The materials were placed in a mixer, and after complete mixture’s homogenization the mixture was pressed in a pneumatic machine Permac model MB0100.

  1. The pressure of the piston was 50 MPa.
  2. Hollow blocks were produced with dimensions of 390 x 190 x 140 mm, classified as M-15 block, according to Brazilian standard NBR 6136,
  3. The cure was performed in a laboratory environment with temperature range of 23+5 °C.2.5 Ultrasonic pulse velocity (UPV) The same hollow blocks were tested by nondestructive test and then by the destructive one.

UPV was recorded once a week during 28 days before the destructive test. An Ultrasonic Tester Steinkamp, model BP7, with exponential transducers with a resonance frequency of 45 kHz was employed. Measurements were carried out in three directions of the blocks, height, length and width, as showed in Figure 1,

Statistical analysis was conducted by the Statgraphics Software, version Centurion XV.I. UPV’s data were evaluated statistically aiming to obtain correlations with the compressive strength allowing applications for the control of material quality.2.6 Water absorption test The blocks were subjected to the water absorption test at 28 days of age, according to Brazilian standard NBR 12118,

Blocks were soaked in water at 23+5 °C during 24 h, and then, they were weighed in saturated condition. Block’s absorption was calculated according to equation 1. w (%) = water absorption; m h = block saturated mass (kg); m s = block dried mass (kg).2.7 Compressive strength The test was conducted in a universal testing machine model DL30000, with device displacement of 2 mm.min -1, The results of the compressive strength (MPa) were obtained by dividing the maximum load (N) by the area of section (mm 2 ), obtaining the average of repetitions, in accordance with standard.

  • Data were analyzed by statistical software (Statgraphics).
  • Average comparison was performed using the Tukey test at 5% of significance level.3.
  • Results and discussion 3.1 Residues characterization Chemical composition and LOI of the residues are shown in Table 2,
  • RHA shows high content of silica, thus corroborating the analysis presented by others researchers (Krishnaro, Bui ).

Potassium content was low for both samples, which is a favorable aspect, as the presence of potassium may cause problems with alkali-aggregate reaction in the cement matrix. However, LOI for RHA was high. According to the Brazilian standard (NBR 12653 ), pozzolan maximum content must be 6% of LOI.

  1. XRD patterns of SF and RHA are presented in Figures 2 and 3, respectively.
  2. As expected, crystalline phases were not identified for SF, and the amorphous material is evidenced.
  3. Peaks of cristobalite and quartz were observed at RHA diffractogram, showing the crystalline phases formation, probably as a consequence of non-controlled burning.

The more crystalline ashes, the lower its reactivity (John ). Table 3 and Figure 4 show the particle size distribution and particle size curve, respectively. It is observed that SF has the smallest particles size when compared to RHA; however, RHA has 90% of its particles below 80 µm, and it presents small average diameter.

  1. Materials with a high fineness may show high reactivity in contact with calcium hydroxide (NBR 12118 ).
  2. Moreover, the fine material fills the voids and presents the effect of a “filler”.
  3. With the combination of these two positive effects, a material might partially replace the cement with advantage, as it does not imply a large increase in water/binder ratio (Cordeiro ).

In this work, it was observed a small increase of water/binder ratio in blocks produced with replacement (by SF or by RHA), due to the fineness of the materials.3.2 Pozzolanic evaluation In order to evaluate the reactivity of RHA, the electrical conductivity of a solution of CH/ash was measured, which was also carried out for SF.

  1. The curves are shown in Figure 5,
  2. It was observed that the CH/SF solution is highly reactive, with large decreases in conductivity in the first hours.
  3. This behavior was already expected, as SF is well known as pozzolan.
  4. The CH/RHA curve shows the reactivity of this ash.
  5. It is observed that RHA reacts slower than SF; however, RHA presented low electrical conductivity, thus showing that it may indicate the formation of CSH products.

After 12 h, for both samples, it was observed the electrical conductivity stabilization, with values close to 0.5 mS.cm-1.3.3 Ultrasonic pulse velocity (UPV) Figures 6, 7 and 8 show the ultrasonic pulse velocity (UPV) values across the concrete hollow blocks at three different directions, respectively width, length and height.

At the width direction ( Figure 6 ), UPV across the hollow blocks with SF was higher than for other hollow blocks, which was expected, as SF is commercially known as a pozzolan, which presents high reactivity. It was observed that, as age increases, there was a small UPV variation across the blocks. There was a statistically significant difference among the UPV for all of the blocks.

At the length direction ( Figure 7 ), it was observed a similar behavior with those from Figure 6, However, control hollow blocks and RHA-based hollow blocks showed no statistical difference between them, but both were statistically different when compared to the SF-based hollow blocks, which showed the highest values of UPV.

  1. The same behavior was observed for the UPV at the height direction.
  2. UPV was higher across the SF-based hollow blocks.
  3. RHA-based and SF-based hollow blocks present higher values of UPV when compared to the control ones due to the “filler” physical effect, with the filling of voids in concrete produced by the different particles size.

Statistical analysis comparing the UPV values at 7 days among the hollow blocks directions shows that there was a statistical significant difference. For length and width, there is no statistical difference; however, they showed statistical difference when compared with the height direction.

The same behavior was observed when comparing UPV at 28 days. For the length and width directions, there is the effect of confinement of the wall mold, which does not happen to the height direction.3.4 Water absorption According to the Brazilian standard (NBR 12118 ), the maximum water absorption for concrete hollow blocks must be 15%.

It is observed in Table 4 that the hollow blocks manufactured with SF or RHA showed low water absorption, when compared to the control ones. If pozzolanic reaction occurs, the products reaction formed are very effective in filling the capillary spaces, thus improving the mechanical strength and impermeability of the matrix (ASTM C55-11 ), as it was observed for the replacements tested.3.5 Compressive strength of concrete hollow blocks As expected, the compressive strength of the SF-based hollow blocks was higher than the other ones ( Figure 9 ).

  • However, statistical analysis showed no statistically difference among the compressive strength of the hollow blocks from the three different mixtures employed (control, cement/SF, cement/RHA).
  • Therefore, according to this test, it is possible to produce hollow blocks with partial replacement of Portland cement by RHA, without decreasing compressive strength.
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Based on the results of physical and mechanical tests, it was observed that, in addition to the residues acting as pozzolans, they may also perform as fillers, thus contributing to lower water absorption and, therefore, increasing the durability of the hollow blocks.3.6 Correlation between UPV and compressive strength In order to obtain a correlation between UPV and compressive strength, a simple regression was performed.

UPV data are related to height direction that was also considered for destructive test. The software used for regression analysis was Statgraphics. Despite a positive tendency of the compressive strength with respect to the UPV, the determination coefficient was only 0.38, thus denoting a small dependence of the variables.

The linear model presented by the software is presented by equation 2. Rc = compressive strength (MPa); UPV = ultrasonic pulse velocity (km.s -1 ) 4. Conclusions The characterization of RHA showed high content of silica, low content of potassium and high fineness, thus denoting its reactivity. However, this ash presents high LOI content, and XRD showed a crystalline material with peaks of cristobalite and quartz.

  • The pozzolanic assessment of RHA showed pozzolanic reactivity when evaluated by electrical conductivity in a CH /ash solution.
  • Non-destructive evaluation of the concrete hollow blocks showed that the highest values of UPV were obtained across the SF-based hollow blocks for three different directions.

Statistical analysis showed that, for length and height directions, the UPV for these hollow blocks presents statistically significant difference when compared to the others ones. RHA-based hollow blocks and SF-based hollow blocks presented lower water absorption when compared to the control ones.

Are hollow bricks load-bearing?

Disadvantages of Hollow Bricks –

  • Hollow blocks have poor bearing capacity because the total mass of wall decoration materials is reduced, the load-bearing capacity is also reduced.
  • It is very dangerous to hang heavy objects on such walls.

Is hollow block load-bearing?

Types of Concrete Blocks –

  1. Hollow Concrete Block (Open and Closed Cavity)
  2. The hollow blocks are divided into below categories
  3. Grade A

This type of block is used in a load-bearing unit and has a minimum block density of 1500 kg/m 3, These blocks are made with average compressive strengths of 3.5, 4.5, 5.5, 7.0, 8.5, 10, 12.5, and 15 N/mm 2 at 28 days. Grade B The Grade-B type blocks are also used as load-bearing units and have block density between 1100 kg/m 3 and 1500 kg/m 3,

Which is better hollow block or solid block?

Advantages of Hollow Blocks Over Solid Blocks: –

  1. Hollow blocks are light in weight thus dead load on structure is less thus consumption of steel per sq.ft will be lower to when solid blocks are used in masonry walls.
  2. The cost of production of hollow block per unit is low as the raw materials consumed for a same sized block will be less as compared to a solid block
  3. Hollow blocks are light in weight than solid ones so the productivity of masons working on masonary works will increase since its easy to handle and place these blocks as compared to Solid Blocks
  4. The Jointing mortar requirement for Hollow blocks is less than Soild blocks as the surface area of application is reduced
  5. Hollow blocks are better acoustic and thermal insulators as compared to Solid blocks. This will reduce the electricity consumed for heating and cooling the rooms inside the house

Happho’s Recommendation: Although Happho recommends using hollow blocks instead of Solid blocks for House construction, we prefer even more new technologies like AAC or CLC blocks for house construction. These blocks are light weight blocks made by creating small voids/pores (which are not interconnected) inside concrete. These blocks have all the advantages of the hollow blocks mentioned above.

Which brick is better for construction?

Hey, When we are constructing our house, we want to make sure we are using the best raw materials in the process. I have conducted research on the best bricks for house construction. I would recommend, you take a look at the list and speak with an engineer about the same.

Eep reading to know more. Which brick is best for construction ? Usually, bricks that are burnt well in kilns, have a table-molded shape and are copper-colored are considered to be a good choice. Bharat Bricks is one of the most coveted brick brands in the country. People have been choosing their bricks and tiles because of their high quality.

Sun-Dried Bricks : These are also known as unburnt bricks. These bricks are famously used in construction in rural areas. These are not as durable and have lower water resistance and less fire resistance. Burnt Clay Bricks : These bricks are of good quality and are used for the construction of walls, columns, foundations, etc.

  • There are 4 different types of burnt bricks: First-Class Bricks, Second-Class Bricks, Third-Class Bricks, and Fourth-Class Bricks.
  • Concrete Bricks : These are made of solid concrete and ingredients such as cement, sand, and water.
  • You will see these bricks being used in hidden/internal brickworks, and fences.

This is all from my end on best bricks for house construction. Buy the house of your dreams ! Check out the real estate platform NoBroker to see properties in your area. Read more : How many bricks required for 12×12 feet room ? How many bricks used in 1 square feet? How many bricks required for 100 square feet?

Which block is best for construction?

Why use concrete blocks for construction? –

Cheaper option: As compared to brick masonry, block masonry is much less expensive. They are known to cost Rs.1,500 less per cubic meter than brick masonry. This is not an insignificant distinction. According to estimates, the cost of constructing a wall out of AAC blocks is 17.65% less than the cost of constructing a wall out of conventional bricks. Better eco-friendly alternative: They do not affect or deplete nature in any way in the process of their production or manufacturing. They’re made of Fly Ash, which is a waste product from thermal power plants. Red bricks, on the other hand, absorb topsoil in their processing and manufacturing, depriving nature of its valuable protective layer of soil. That is the primary explanation for the National Green Tribunal’s opposition to red bricks. Soundproofing quality: Soundproofing may be a blessing for those who live in industrial areas or along busy roads. As opposed to brick constructions, block walls have a higher density and therefore have greater soundproofing. If your home is constantly surrounded by noise that prevents you from having a good night’s sleep, their powerful acoustic insulation is a huge help. Lighter weight: As compared to red bricks, concrete blocks are lighter, allowing for greater workability, stability, and durability. Their dry density ratio lowers the dead load on buildings, making them more functional and ideal for modern structures. Better strength: Concrete blocks are considered to be more resistant to earthquakes, hurricanes, and tornadoes, all of which are becoming more common these days. Countries that facilitate and encourage the use of blocks put a high priority on their resilience in the face of natural disasters. The way they’re built adds to their durability and strength. Space-saving: Concrete blocks are often recommended by builders and contractors because they save a significant amount of space overall. The width is reduced, but the reliability is not compromised, increasing the amount of space needed in the construction of walls. The traditional brick walls are being phased out, particularly in big cities where there is a lot of competition for space.

When it comes to choosing between concrete block and burnt brick, it’s a toss-up. Anyone who is about to begin building must consider the advantages and disadvantages of both concrete blocks and burnt brick. However, a lot is dependent on the budget, the builder’s situation, and the available space.

  1. If you want a one-time investment and want to avoid a lot of maintenance, then going for burnt bricks would be right for you.
  2. However, the production of burnt bricks is not eco-friendly.
  3. While concrete bricks are cheaper, the waste from them is non-recyclable.
  4. All in all, you have to keep in mind all the points and weigh which option suits better to your construction needs.

Also Read:

How does determining slab height affect construction cost? How does Concrete & Steel Testing help in reducing construction costs? How fine aggregate affects concrete mix design

What are the advantages and disadvantages of hollow blocks?

Advantages of Hollow Concrete Block – Hollow block helps in saving construction materials and therefore the use of hollow block reduces construction cost. Use of larger size concrete blocks reduces the number of joints in work and hence helps in saving mortar.

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Can you lay hollow blocks while raining?

Can You Lay Bricks in the Rain? For many, the idea of laying bricks in the rain might seem like one that is relatively straightforward. After all, in the UK, bricks and mortar are exposed to the elements all year round so why wouldn’t it be possible to lay bricks in the rain? The reality is that there is a lot more to laying bricks in the rain than putting on waterproof clothing and getting on with the job because this is a recipe for disaster.

  1. Laying Bricks During Winter Sure, in the UK, we don’t just get rain during the winter but that is when we get most of it.
  2. The approach to bricklaying should be the same regardless of the time of year.
  3. Additional or excess moisture can cause severe problems for bricks and mortar and that’s why it’s important to take a considered approach.

The most obvious source of moisture comes in the form of rain. The main message here is to not lay bricks in the rain. If you lay bricks in the rain then first and foremost, you will be exposing all brickwork to water over a prolonged period of time. This means that there is an increased risk of leaching, while cement residues and efflorescence will rise and that can lead to a poor finish to the front of,

When laying bricks, the mortar and bricks have to work together to ensure that they bond together but laying brick in the rain reduces the chances of this working correctly. When mortar becomes over-hydrated, a chemical process takes place and it can also lead to the mortar being unable to harden correctly and that could mean that it flushes out of the joints.

As mentioned, the winter months are notoriously bad for long periods of rain and that means that it’s vital to ensure that the brickwork is protected adequately throughout. How to Approach the Weather When Bricklaying The most important thing is to ensure that you check the weather.

The last thing you want to do is begin laying bricks when there is a 99% chance of rain as that will undo all of the hard work you have done. On a damp but not wet day, take practical precautions before you lay bricks. However, to ensure you can pick up the job once the rain has passed, it’s vital to ensure that you protect and store materials correctly.

This will also include any part-finished work that you have completed because sometimes, the elements can creep up on us when we are not even expecting it. Therefore, you will need to ensure that any brick structure is protected and insulated where necessary, especially if the weather is cold and frost is likely.

  1. A hessian blanket is useful for this but it’s not suitable in the rain on its own, so a polythene sheet will provide waterproof protection.
  2. Furthermore, you will also need to make sure that all unused bricks are protected too, especially if rain and freezing temperatures are likely to arrive together.

So, laying bricks in the rain is not something that is recommended and if you want to ensure that you achieve the best finish and minimise problems then you should make sure that the weather is dry before you begin laying bricks. : Can You Lay Bricks in the Rain?

Why hollow blocks have holes?

The openings are called “cells” and one reason they are there is because they make the blocks lighter and easier for a mason to handle. But the primary purpose of the cells is that they align from top to bottom of the wall when laid, and enable a builder to fill some cells with grout/concrete to strengthen the wall.

It is often done at sides of larger window and door openings, and vertical steel reinforcing bars are added. This detail is especially important in hurricane-prone areas of South Florida that are designated by the Florida Building Code (FBC) as within the High Velocity Hurricane Zone (HVHZ). See our blog post What are the pros and cons of concrete block versus wood frame construction? to learn more about concrete construction.

• • • • • • • • • • • • • • • • • • • • • • • • • • • • To learn more about exterior walls and structures, see these other blog posts: • What is the average lifespan of a house foundation? • What causes vertical cracks in fiber cement siding planks? • What causes raised white lines of residue on a block wall that are crusty and crumbling? • What is the difference between soil subsidence, heave, creep, and settlement? • How much ventilation is required for the under-floor crawl space of a home? • What causes stair-step cracks in a block or brick wall? • What causes a horizontal crack in a block or brick wall? • How can I tell if a diagonal crack in drywall at the corner of a window or door indicates a structural problem? • What causes the surface of old bricks to erode away into sandy powder? • What are the pros and cons of concrete block versus wood frame construction? • Should I buy a house with a crawl space? • Why is my stucco cracking? • There’s cracks running along the home’s concrete tie beam. What’s wrong? • What would cause long horizontal lines of brick mortar to fall out? • How do I recognize serious structural problems in a house? • What is engineered wood siding? • Should I buy a house that has had foundation repair? • What is a “continuous load path”? • Should I buy a house with asbestos siding? • How can I tell if cracks in the garage floor are a problem or not? • What do you look for when inspecting vinyl siding? • Why is housewrap installed on exterior walls under the siding? • How do I recognize serious structural problems in a house? • Why did so many concrete block homes collapse in Mexico Beach during Hurricane Michael? • How can I tell if the concrete block walls of my house have vertical steel and concrete reinforcement? • Should I buy a house with structural problems? • What are those powdery white areas on my brick walls? • What causes cracks in the walls and floors of a house? • How can I tell if the exterior walls of a house are concrete block (CBS) or wood or brick? • What are the common problems of different types of house foundations? • What are the warning signs of a dangerous deck? • How can I tell whether my house foundation problems are caused by a sinkhole or expansive clay soil? Visit our EXTERIOR WALLS AND STRUCTURE page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

What is the disadvantage of hollow concrete block masonry?

7. Disadvantages of Hollow Blocks –

  1. The disadvantages of Hollow blocks are as follows:
  2. ✔ Maintenance cost is high.
  3. ✔ Concrete blocks have a low bearing capacity as the average of wall decoration materials is reduced, and the load-bearing capacity is usually decreased.
  4. ✔ It is very risky to hang huge things on walls.
  5. ✔ Hollow blocks are porous so, a high chance of water seepage.

Is hollow bricks good for home?

In a structural sense, combining hollow concrete bricks with concrete core filling and steel reinforcement are superior to traditional brickwork in terms of compression strength and sheer strength.

Is hollow bricks good for home?

In a structural sense, combining hollow concrete bricks with concrete core filling and steel reinforcement are superior to traditional brickwork in terms of compression strength and sheer strength.

Which is better hollow blocks or pure cement?

The pros and cons of hollow blocks versus poured concrete – There are advantages and disadvantages to both methods. Using hollow blocks can be cheaper, easier, and faster to install, given that you have skilled masons who have years of experience on the job.

  • One drawback however is that the load bearing capacity of concrete block walls are less than that of poured concrete walls.
  • Thus, they more prone to cracks, structural failure, and leaks as they age.
  • Poured concrete walls meanwhile, are typically more expensive and labor extensive to build.
  • However, they are stronger by at least five times than concrete hollow blocks.

Poured concrete also carries the benefit of being better load bearing walls and are known to better withstand earthquake impacts. So there you have it. Which method better fits your needs and budget best? That is one detail that your architect and engineer will not miss, so better decide on it right away.