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All Q&A
1

Discuss plasticizers and superplasticizers, indicating their purpose. Name some products and their dosage for use as plasticizers and superplasticizers.

 30 June, 2022
Plasticizers is used mainly to fluidity the mix and improve the workability of concrete, mortar or grout. Plasticizers are high range water – reducers.
2

Introduce Flow table test. How can sulphate attack be controlled?

 30 June, 2022
This is a laboratory test, which gives an indication of the quality of concrete with respect to consistency, cohesiveness and the proneness to segregation.
3

Distinguish between retarders and accelerators. Under what circumstances are they used? Name some products and their dosage for use as accelerating and retarding admixtures.

 30 June, 2022
It is an admixture that slows down the chemical process of hydration so that the concrete remains plastic and workable for long time.
4

How standard consistency test is done on cement? Explain the procedure briefly.

 30 June, 2022
Standard consistency of cement paste is defined as that consistency which permits the Vicat plunger to penetrate to a point 5 to 7 mm from the bottom of the Vicat mould in this test.
5

What is an air entraining agents? Give some examples. What is efflorescence in concrete structure?

 30 June, 2022
Air entraining concrete is made by mixing a small quantity of air entraining agent or by using air entraining cement.
6

Short notes on :

  • Light Weight Concrete
  • Segregation
  • White Cement
  • Abrasion Value
 30 June, 2022
The most significant property is reduced weight at no sacrifice in strength. Structural lightweight concrete available today are rotary kiln expanded shale, clay or slate (roughly 80% of structural use) and sintered expanded shale or clay (20%) provides the same compressive strength as normal weight aggregates with approximately the same cement content.
7

What are the raw materials used for the production of Portland pozzalana cement?What are the main stages of manufacturing Portland pozzalana cement?

 30 June, 2022
The raw materials required for manufacture of PPC are OPC clinkers with 10 – 25 % of Pozzolanic material.
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Irrigation Engineering surveying Design of Reinforced Concrete Structures
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