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542 questions
Describe about the Rebound Hammer test method and the ultrasonic pulse testing method for determining the strength of concrete.
It consist of a spring control hammer that slides on a plunger within a tubular housing. When the plunger is pressed against the surface of the concrete, the mass rebound from the plunger.
How do water-cement ratio and workability affect the strength of concrete? What are the factors promoting shrinkage?
w/c ratio is directly proportional to workability and inversely proportional to strength.
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.
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