537 questions and answers
What are flaky and elongated aggregates? How can the shape of aggregate influence strength of concrete? Following is the result of a sieve analysis of 500 gm aggregate:
| IS sieve size | 10 mm | 4.75 mm | 2·36 mm | 1·18 mm | 600 micron | 300 micron | 150 micron | lower than 150 micron |
| Weight retained in gm | 0 | 10 | 50 | 50 | 95 | 175 | 85 | 35 |
Find out the 'Fineness Modulus' of the sample
This agg. Are those whose least dimension i.e. thickness is less than 3/5 th of their mean dimension.
Short notes on :
It is a composite material essentially consisting of conventional concrete reinforced by the random dispersal of short, discrete and discontinuous fine fibers.
State the effect of shape and size of aggregate on strength of concrete.
The shape of aggregate influence workability in good measure.
Short notes on :
slump cone test is done to determine the workability of concrete or how much the concrete is fluid or plastic . This test is suitable for high workability mix.
What are the raw materials used for the production of Portland pozzalana cement?What are the main stages of manufacturing Portland pozzalana cement?
The raw materials required for manufacture of PPC are OPC clinkers with 10 – 25 % of Pozzolanic material.
Short notes on :
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.
Discuss the role of Gel-space ratio. How can it be determined? Calculate the gel-space ratio and theoretical strength of a sample of concrete made with 500gm of cement with 0.5 w/c ratio on full hydration and 40% partial hydration. Discuss the factors which influence creep in concrete?
Instead of relating the strength to w/c ratio, the strength can be more correctly related to the solids products of hydration of cement to the space available for formation of this product.
What is an air entraining agents? Give some examples. What is efflorescence in concrete structure?
Air entraining concrete is made by mixing a small quantity of air entraining agent or by using air entraining cement.
How standard consistency test is done on cement? Explain the procedure briefly.
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.
Distinguish between retarders and accelerators. Under what circumstances are they used? Name some products and their dosage for use as accelerating and retarding admixtures.
It is an admixture that slows down the chemical process of hydration so that the concrete remains plastic and workable for long time.
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