Composition of good brick earth:
- 1) Silica. Good brick earth should contain 50 – 60% of silica.
- 2) Alumina. Good brick earth should contain 20 – 30% of Alumina.
- 3) Lime. It should not be greater than 5% for good bricks.
- 4) Iron oxides. It should be in the range of 5 – 6% for the good bricks.
- 5) Magnesia.
- 1 What are the constituents of good brick clay?
- 2 Which is the main constituent of brick?
- 2.1 Which of the following constituent in brick earth gives plasticity?
- 2.2 What are the two primary constituents of clay?
- 2.3 Which of the following constituents should be present in least amount in good brick earth?
- 2.4 What are the properties of good quality brick?
- 2.5 What are the properties of good earth for manufacture of bricks?
- 2.6 What does brick earth mean?
- 3 Which constituent in earth prevents shrinkage of bricks?
- 4 What is an earth brick?
- 5 How many bonds does brick have?
How many constituents are there in the brick earth?
Basic Civil Engineering Questions and Answers – Composition of Good Brick Earth This set of Basic Civil Engineering Interview Questions and Answers for Experienced people focuses on “Composition of Good Brick Earth”.1. How many constituents are there in the brick earth? a) 5 b) 4 c) 6 d) 8 View Answer Answer: a Explanation: For a good brick earth, 5 major constituents are needed.
They are alumina, silica, lime, oxides of iron and magnesia.2. Which one of the below is the most important ingredient in the brick earth? a) Alumina b) Lime c) Silica d) Magnesia View Answer Answer: c Explanation: The amount of silica present in brick earth is 50-60% and it prevents cracking and warping of raw bricks.3.
In what form should lime be present in the brick earth? a) Paste b) Lump c) Clinker d) Powder View Answer Answer: d Explanation: Lime should be present in the brick earth in the form of very finely powdered state so as to prevent the flaking of bricks.
Note: Join free Sanfoundry classes at or 4. Excess of oxides of iron makes the brick: a) Red in colour b) Black in colour c) Dark blue in colour d) Yellow in colour View Answer Answer: c Explanation: Iron oxide imparts the red colour to the brick. Presence of magnesia makes brick yellowish and manganese makes it black.
Excess of oxides of iron makes the brick dark blue on burning.5. What happens to raw bricks if an excess of alumina is present? a) Becomes hard b) Becomes brittle c) Decay d) Shrinkage View Answer Answer: d Explanation: Raw bricks develop shrinkage, cracks, warping in presence of excess alumina.
- Other three changes happen on burnt bricks or final brick product due to excess of other constituents.6.
- What is the harmful effect of presents of alkali in brick earth on bricks? a) Discolourises bricks b) Efflorescence c) Porous bricks d) Flaking View Answer Answer: b Explanation: Alkali exists in the form of soda and potash.
Alkalis absorb moisture and with a passage of time, it gets evaporated, leaving white powdery deposits called efflorescence.7. Why do bricks become brittle when excess silica is present? a) Pores are created b) Flaking occurs c) Thermal stability is lost d) Cohesion is lost View Answer Answer: d Explanation: Silica is present is either free or combined form.
- It is usually present as sand, which is cohesionless in nature.
- So, excess of silica would lead to loss of cohesion between particles and this make the brick brittle.8.
- Which of the following leads to the formation of small pores in brick? a) Iron pyrites b) Pebbles c) Organic matter d) Alkalis View Answer Answer: c Explanation: Organic matter aids in the burning process.
If it does not get burnt completely, gases are released which will lead to the formation of small pores, making brick porous.9. The presence of which of the below renders clay totally unsuitable for brick manufacture? a) Kallar b) Kankar c) Hay d) Lime View Answer Answer: a Explanation: Kallar or Reh consists of sodium sulphate.
Bricks do not burn properly in its presence. After burning, it causes the surface of brick to peel off and crumble later on.10. Carbonaceous material in small amounts is good for the brick earth. a) True b) False View Answer Answer: b Explanation: It is a harmful ingredient that causes different colours in interior and exterior of brick.
Their presence defaces the plastering by discolouration.11. How many types of the brick earth are there? a) 3 b) 5 c) 2 d) 6 View Answer Answer: a Explanation: The three types are loamy, mild or sandy clay; marls, chalky or calcareous clay and plastic, strong or pure clay.12.
- Loamy, mild or sandy clay has _ percentage of alkali? a) 5% b) 1% c) 4% d) 0% View Answer Answer: d Explanation: It does not contain any alkali contents.
- It contains 5% of organics matter, 1% of lime, magnesia and oxides of iron, 66% of silica and 27% of alumina.
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What are the constituents of good brick clay?
Brick Clay suitable clay for the manufacturing of bricks or coarse pottery, Often an impure clay containing iron, calcium, magnesium and other ingredients is referred to as brick clay. The chief chemical composition of brick clays is silica, alumina, iron oxide, magnesia, lime and alkalis.
- Either more or less than the required amount of any of these constituents may cause serious damage to the products.
- The presence of some harmful constituents like iron concretions, stone particles, soluble salts and limestone has a detrimental effect on brick.
- In Bangladesh the mineralogical, chemical and engineering properties of the Pleistocene and Holocene brick clays of Dhaka, Narayanganj and Narsingdi districts are well documented.
Quartz, illite, chlorite and kaolinite are the major components of the Holocene samples whereas quartz, illite and kaolinite are the major constituents of the Pleistocene clays. Both potash and plagioclase feldspars are present in all the samples as minor constituents.
Montmorillonite is not detected in any of the samples. The bulk chemistry of the Holocene and Pleistocene samples has been found satisfactory for manufacturing good quality bricks. However, the Holocene clay is slightly enriched with silica (60.72 to 63.49%), lime (1.11 to 1.49%) and magnesia (2.16 to 2.87%) while the Pleistocene Madhupur clay is rich in alumina (19.95 to 21.07%) and iron oxide (8.12 to 9.82%).
Though the madhupur clay is rich in alumina, the concentration of alumina noted is considerably lower than that of the recommended value for an ideal brick clay. Harmful constituents like soluble salts, organic matter and vegetation are found at low concentrations.
But considerable amounts of iron concretions are detected in the Pleistocene samples. The Holocene samples are composed dominantly of silt-sized particles (53.24 to 84.31%) whereas the percentage of clay-sized particles (43.43 to 49.85%) in the Pleistocene samples are greater than that of the silt-sized particles (34.75 to 43.25%).
The obtained liquid limit, plastic limit and plasticity index values suggest that the Holocene samples have intermediate plasticity and the Pleistocene samples are in the range of intermediate to high plasticity. The Pleistocene Madhupur clay shows slightly greater swelling potential than the Holocene clay.
As far as the activity of the clay is concerned, all the samples are ‘inactive’ to ‘normal’ and are quite suitable for brick making. Linear shrinkage values of the samples indicate that the Holocene ones are ‘non-critical’ to ‘marginal’ while the Pleistocene ones are ‘marginal’. The volumetric shrinkage values, in all the samples, are within the range recommended for typical brick clays.
Recently clays of the dupi tila formation are also used in brickfields for the manufacture of good quality bricks.
Which is the main constituent of brick?
Chief Ingredients of Brick and Their Functions – Silica (Sand) and Alumina (Clay), these two are the most prominent ingredients in brick clay. When mixed with water in proper proportions, it gains plasticity. The plastic mass can be easily molded and dried. It should not go through cracking, shrinkage or warping.
Which of the following constituent in brick earth gives plasticity?
Alumina in Brick Good brick earth should contain about 20% to 30% of alumina. It is responsible for plasticity characteristic of earth, which is important in a moulding operation.
Which of the following is not a constituent of good brick earth?
Silica is the right answer. Major constituent is Alumina not silica.
What are the two primary constituents of clay?
General considerations – The term clay is generally applied to (1) a natural material with plastic properties, (2) particles of very fine size, customarily those defined as particles smaller than two micrometres (7.9 × 10 −5 inch), and (3) very fine mineral fragments or particles composed mostly of hydrous-layer silicates of aluminum, though occasionally containing magnesium and iron.
Although, in a broader sense, clay minerals can include virtually any mineral of the above-cited particle size, the definition adapted here is restricted to represent hydrous-layer silicates and some related short-range ordered aluminosilicates, both of which occur either exclusively or frequently in very fine-size grades.
The development of X-ray diffraction techniques in the 1920s and the subsequent improvement of microscopic and thermal procedures enabled investigators to establish that clays are composed of a few groups of crystalline minerals. The introduction of electron microscopic methods proved very useful in determining the characteristic shape and size of clay minerals.
- More recent analytical techniques such as infrared spectroscopy, neutron diffraction analysis, Mössbauer spectroscopy, and nuclear magnetic resonance spectroscopy have helped advance scientific knowledge of the crystal chemistry of these minerals.
- Clay minerals are composed essentially of silica, alumina or magnesia or both, and water, but iron substitutes for aluminum and magnesium in varying degrees, and appreciable quantities of potassium, sodium, and calcium are frequently present as well.
Some clay minerals may be expressed using ideal chemical formulas as the following: 2SiO 2 ·Al 2 O 3 ·2H 2 O (kaolinite), 4SiO 2 ·Al 2 O 3 ·H 2 O ( pyrophyllite ), 4SiO 2 ·3MgO·H 2 O ( talc ), and 3SiO 2 ·Al 2 O 3 ·5FeO·4H 2 O ( chamosite ). The SiO 2 ratio in a formula is the key factor determining clay mineral types.
These minerals can be classified on the basis of variations of chemical composition and atomic structure into nine groups: (1) kaolin-serpentine (kaolinite, halloysite, lizardite, chrysotile), (2) pyrophyllite-talc, (3) mica (illite, glauconite, celadonite), (4) vermiculite, (5) smectite (montmorillonite, nontronite, saponite), (6) chlorite (sudoite, clinochlore, chamosite), (7) sepiolite-palygorskite, (8) interstratified clay minerals (e.g., rectorite, corrensite, tosudite), and (9) allophane-imogolite.
Information and structural diagrams for these groups are given below. Kaolinite is derived from the commonly used name kaolin, which is a corruption of the Chinese Gaoling (Pinyin; Wade-Giles romanization Kao-ling), meaning “high ridge,” the name of a hill near Jingdezhen where the occurrence of the mineral is known as early as the 2nd century bce,
Montmorillonite and nontronite are named after the localities Montmorillon and Nontron, respectively, in France, where these minerals were first reported. Celadonite is from the French céladon (meaning grayish yellow-green) in allusion to its colour. Because sepiolite is a light and porous material, its name is based on the Greek word for cuttlefish, the bone of which is similar in nature.
The name saponite is derived from the Latin sapon (meaning soap), because of its appearance and cleaning ability. Vermiculite is from the Latin vermiculari (“to breed worms”), because of its physical characteristic of exfoliation upon heating, which causes the mineral to exhibit a spectacular volume change from small grains to long wormlike threads.
Which of the following constituents should be present in least amount in good brick earth?
Composition, – A good brick-earth should be such that when prepared with water it can be easily moulded, dried and burnt with out cracking or warping. It should contain a small quantity of finely divided lime to help in binding the particles of brick together by melting the particles of sand.
A good brick earth should preferably conform to the following composition : Clay (Alumina) 20 to 30 per cent by weightSilt 20 to 35 per cent by weightSand 35 to 50 per cent by weightThe total content of clay and silt should not as far as possible be less than 50% by weight.
What are the properties of good quality brick?
Characteristics of Good Bricks It is always desirable to use the best quality brick in constructions. Therefore, the Characteristics of a good brick must be investigated. Generally good bricks possesses following properties-
Bricks should be uniform in color, size and shape. Standard size of brick should be maintained. They should be sound and compact. They should be free from cracks and other flaws such as air bubbles, stone nodules etc. with sharp and square edges. Bricks should not absorb more than 1 ⁄ 5 of their own weight of water when immersed in water for 24 hours (15% to 20% of dry weight). The compressive strength of bricks should be in range of 2000 to 5000 psi (15 to 35 MPa). Salt attack hampers the durability of brick. The presence of excess soluble salts in brick also causes efflorescence. The percentage of soluble salts (sulphates of calcium, magnesium, sodium and potassium) should not exceed 2.5% in brunt bricks. Brick should not change in volume when wetted. Bricks should neither overburnt nor under-brunt. Generally, the weight per brick should be 6 lbs. and the unit weight should be less than 125 lbs. per cubic ft. The thermal conductivity of bricks should be low as it is desirable that the building built with them should be cool in summer and warm in winter. Bricks should be sound proof. Bricks should be non-inflammable and incombustible. Bricks should be free from,
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What are the properties of good earth for manufacture of bricks?
A good brick earth should contain about 20 to 30 per cent of alumina. This constituent imparts plasticity to earth so that it can be moulded. constituent prevents cracking, shrinking and warping of raw bricks. It thus imparts uniform shape to the bricks.
What does brick earth mean?
: clay used for making bricks.
Which constituent in earth prevents shrinkage of bricks?
Free Gujarat Engineering Service 2019 Official Paper (Civil Part 1) 150 Questions 150 Marks 90 Mins Explanation a) Lime in Bricks For good brick earth, it is desirable not to have lime more than 5%. Lime prevents shrinkage of raw bricks Excess of Lime causes the brick to melt and therefore its shape can be lost. Important Points The constituents of good brick earth: i) Alumina: It is the chief constituent of every kind of clay. This constituent imparts plasticity to the earth so that it can be moulded. ii) Silica: The presence of this constituent prevents cracking, shrinking, and warping of raw bricks.
It thus imparts a uniform shape to the bricks. ii) Oxide of iron: It acts as a catalyst in the fusion of ingredients of bricks. It also imparts a red color to the bricks. vi) Magnesia: A small quantity of magnesia in brick earth imparts a yellow tint to the bricks and decreases shrinkage. Latest GPSC Engineering Services Updates Last updated on Oct 1, 2022 The Gujarat Public Service Commission (GPSC) has released a new notification for the GPSC Engineering Services Recruitment 2022.
The commission has released 28 vacancies for the recruitment process. Candidates can apply for the applications from 15th October 2022 to 1st November 2022 and their selection will be based on Prelims, Mains and Interview. Candidates with a Graduation degree as the basic GPSC Engineering Services Eligibility Criteria are eligible to appear for the recruitment process.
Which is most important ingredient of the Brickearth?
Free CT 1: सामान्य हिंदी (संधि और संधि विग्रह) 10 Questions 10 Marks 10 Mins Explanation Composition of good brick earth: 1) Silica A good brick earth should contain 50 – 60% of silica. It prevents cracking, shrinking and wrapping of raw bricks. Silica imparts uniform shape to the bricks.
Excess of silica make the bricks brittle.2) Alumina A good brick earth should contain 20 – 30% of Alumina. Alumina imparts plasticity to the earth, so that it can be moulded. If it is excess raw bricks shrink and wrap during drying and burning.3) Lime It should not be greater than 5% for good bricks 4) Iron oxides It should be in the range of 5 – 6% for the good bricks.5) Magnesia It imparts colour to the brick.
It also deceases shrinkage in the bricks. Last updated on Sep 26, 2022 The Uttarakhand Public Service Commission (UKPSC) released the provisional answer key for the UKPSC AE (Assistant Engineer) Recruitment Exam on 24th May 2022. The candidates can calculate the total marks obtained by them in the written exam but the commission made it clear that it must not be treated as the final result of the exam.
How many Brickforce are there?
There are 4 products.
How many classes of brick are there?
ON FIELD PRACTICE: – Based upon the physical and mechanical properties the bricks are classified into four types such as, first class, second class, third class and fourth class.
What is an earth brick?
Building a CEB project in Midland, Texas in August 2006 A compressed earth block ( CEB ), also known as a pressed earth block or a compressed soil block, is a building material made primarily from an appropriate mix of fairly dry inorganic subsoil, non-expansive clay, sand, and aggregate,
Forming compressed earth blocks requires dampening, mechanically pressing at high pressure, and then drying the resulting material. If the blocks are stabilized with a chemical binder such as Portland cement they are called compressed stabilized earth block (CSEB) or stabilized earth block (SEB). Typically, around 3,000 psi (21 MPa) of pressure is applied in compression, and the original material volume is reduced by about half.
Creating CEBs differs from rammed earth in that the latter uses a larger formwork into which earth is poured and manually tamped down, creating larger forms such as a whole wall or more at one time, rather than building blocks. CEBs differ from mud bricks in that the latter are not compressed, but solidify through chemical changes that take place as they air dry.
The compression strength of properly made CEB usually exceeds that of typical mud brick. Building standards have been developed for CEB. CEBs are assembled onto walls using standard bricklaying and masonry techniques. The mortar may be a simple slurry made of the same soil/clay mix without aggregate, spread or brushed very thinly between the blocks for bonding, or cement mortar may also be used for high strength, or when construction during freeze-thaw cycles causes stability issues.
Hydraform blocks are shaped to be interlocking.
How many bonds does brick have?
There are five basic structural bonds commonly used today which create typical patterns. These are: Running bond, common or American bond, Flemish bond, English bond and block or stack bond, as illustrated in Fig.