Pozzolana cement Pozzolana cement is used for underwater construction. It is extremely water resistant.
- 1 Which cement is best for marine construction?
- 2 Can you cement underwater?
- 3 Which is better cement grade 43 or 53?
- 4 How is construction done underwater?
Which cement is best for marine construction?
Free 20 Questions 20 Marks 20 Mins The blast furnace slag cement has very low permeability and provides good resistance to chloride and sulphate attack which is present in seawater. The blast furnace slag cement is widely used in the marine structure.
Blast furnace slag cement other uses: Used for structures meant for water retaining such as retaining wall, rivers, ports, tunnels for improvement in impermeability. Used in mass concreting works such as dams, foundations which require low heat of hydration. Last updated on Sep 27, 2022 Uttarakhand Power Corporation Limited (UPCL) is soon going to announce the official notification for the UPCL AE 2022.
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Can you cement underwater?
Contrary to popular belief, concrete can in fact cure underwater. Using this knowledge, we are then able to use concrete underwater for building purposes. However, there is a compromise. When using concrete in water, you must ensure that the concrete is injected directly to where it is needed.
Which cement is used for marine structure Mcq?
Basic Civil Engineering Questions and Answers – Types of Cement and Uses This set of Basic Civil Engineering Questions and Answers for Experienced people focuses on “Types of Cement and Uses”.1. What is the abbreviation of PPC? a) Perfect Portland Cement b) Portland Produced Cement c) Portland Pozzolana Cement d) Productive Portland Cement View Answer Answer: c Explanation: Pozzolana is a material containing silica.
- PPC is formed by intergrinding ordinary Portland cement, clinker, gypsum and pozzolanic material.2.
- Which of the following is not an advantage of rapid hardening cement? a) Faster construction b) Short curing period c) Light in weight d) Higher final setting time View Answer Answer: d Explanation: The initial and final setting time of rapid hardening cement is the same as that of ordinary cement.
It attains higher strength in less time. It develops the same strength of ordinary cement in four days rather than 28 days.3. High alumina cement can be used for massive concrete work. a) True b) False View Answer Answer: b Explanation: High alumina cement is obtained by adding 55% bauxite and 35-45% lime.
It hardens rapidly and it is costlier. It cannot be used for massive concrete work.4. How many types of cement are there based on the ability to set in presence of water? a) 2 b) 3 c) 4 d) 5 View Answer Answer: a Explanation: The 2 types are hydraulic and non-hydraulic cement. Hydraulic cement sets and becomes adhesive due to reaction with water.
Non-hydraulic cement does not set under-water or in wet conditions.5. What property does air-entraining cement provide? a) Workability b) Soundness c) Fineness d) Strength View Answer Answer: a Explanation: Air-entraining agents are added to cement during manufacturing.
These create voids and in turn increases workability when used in concrete. Get Free Now! 6. Which of the following types of cement is used in marine structures? a) Expanding cement b) High alumina cement c) Blast furnace slag cement d) White cement View Answer Answer: c Explanation: Blast furnace slag cement is obtained by combining slag and cement clinkers.
These have less heat of hydration and are not affected by sea water. Hence, can be used for marine structures.7. Which pair of the compound and coloured cement mentioned below is wrong? a) Iron oxide-yellow b) Cobalt-black c) Chromium oxide-green d) Manganese dioxide-brown View Answer Answer: b Explanation: Cobalt imparts blue colour to cement.
- Iron oxide in different proportion imparts brown, red and yellow colour.
- Manganese dioxide produces brown and black coloured cement.8.
- Low heat cement is ideal for use in the construction of dams.
- A) True b) False View Answer Answer: a Explanation: Heat of hydration is heat produced during chemical action between cement and water.
In mass concreting works (dam) heat will be high and effect the stability of a structure. Hence, low heat cement is ideal for use.9. Which of the following is not a pozzolanic material? a) Fly ash b) Silica fume c) Cinder d) Slag View Answer Answer: c Explanation: Pozzolans are silicate based materials that form cementitious materials.
Fly ash, silica fumes and slag are composed of oxide of silicon. Cinder is a coal residue.10. Water proof cement is prepared by mixing ordinary cement with: a) Resins b) Water repellent chemicals c) Sulpho-aminate d) Metal stearates View Answer Answer: d Explanation: Resins are added in air entraining cement.
Water repellent chemicals in hydrophobic cement. Sulpho-aminate is added in expanding cement. Metal stearates (Ca, Al, etc) are added in small percentage during grinding to get water proof cement. Sanfoundry Global Education & Learning Series – Basic Civil Engineering.
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Which is better cement grade 43 or 53?
The differences between 53 Grade cement and 43 Grade Cement The differences between 53 Grade cement and 43 Grade Cement
|Title||43 Grade||53 Grade|
|Introduction||The 43 grade OPC is a popular general-purpose cement in the country today.||The 53 Grade OPC cement is higher strength cement used for strength concrete.|
|Production||The production of 43-grade OPC is nearly 50 percent.||The production of 53-grade OPC is nearly 40-50 percent.|
|Setting||It sets less quick than OPC 53 cement.||It sets very quickly and it has low initial setting times.|
|IS Code||IS 8112||IS 12269|
|Complete strength at||Continues to gain strength after 28th days||Early strength gain Ultimate strength gain is the same for both cements.|
|The heat of hydration||Medium||Faster|
|Uses||It is basically used for PCC and RCC works and for the purpose of waterproofing, plastering, tiling, Brick and stone masonry, and Flooring. Also used for the Finishes of bridges, culverts, roads, and water retaining structures.||All structures like footing, column, beam, and slab. Precast concrete items such as paving blocks, blocks, railway sleepers, poles, etc.|
- Grade 43
- It is basically used for PCC and RCC works and for the purpose of waterproofing, plastering, tiling, Brick and stone masonry, and Flooring.
- Also used for the Finishes of bridges, culverts, roads, and water retaining structures.
- Grade 53
- All structures like footing, column, beam, and slab.
- Precast concrete items such as paving blocks, blocks, railway sleepers, poles, etc.
1 month ago : The differences between 53 Grade cement and 43 Grade Cement
Which cement is not used in the construction of hydraulic structure?
Hydraulic Cement and Non-Hydraulic Cement Difference – There are differences in their composition and the way they are used.
Hydraulic Cement is made out of limestone, clay and gypsum. Non Hydraulic Cement is composed of lime, gypsum plaster and oxychloride.Hydraulic Cement hardens when there is a chemical reaction between anhydrous cement powder with water. The hydrates that are formed are not soluble in water. It retains its strength and hardness below water. Non hydraulic Cement hardens when there is a reaction due to carbonation with the carbon di oxide which is naturally present in the air.Hydraulic Cement hardens under water or when in contact with wet weather. Hence it is suitable to work with in any climatic conditions. Non Hydraulic Cement should be kept dry to attain strength.Hydraulic cement is used in multiple applications like concrete, mortar in masonry, swimming pools, marine construction, foundations, manholes, reservoirs to name a few. Non hydraulic cement is becoming redundant and obsolete due to the long duration of time taken for setting of cement.
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Which cement is used for the construction of water retaining structure like tanks?
13. Hydrographic cement – Hydrographic cement is prepared by mixing water-repelling chemicals and has high workability and strength. It has the property of repelling water and is unaffected during monsoon or rains. Hydrophobic cement is mainly used for the construction of water structures such as dams, water tanks, spillways, water retaining structures, etc.
How is construction done underwater?
Civil engineering –
Construction below the water table is mostly managed by using cofferdams or pressurised caissons to exclude water sufficiently to work above the local water level within the enclosure, though it may also be possible to keep the water level down by pumping it out as fast as it seeps in, thereby artificially lowering the water table at the worksite. Dams, reservoirs, canals, locks Bridges and causeways over bodies of water often require foundation structure below water level. Usually this is done using coffer dams and caissons, which themselves may involve underwater work.
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