Question
Download Solution PDFConsider the below statements with respect to cement concrete and identify the correct statement(s).
i. Size and shape of aggregates used in making concrete influence the workability of concrete.
ii. As the water cement ratio in making concrete increases, the strength of concrete increases.
iii. Maturity of concrete is independent of temperature at which it is cured.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation
Effect of water-cement ratio on concrete:
- The ratio of water-cement is generally lying in between 0.35 to 0.65.
- Water cement ratio inversely proportional to the strength of concrete. If the water-cement ratio increases then the strength decreases and vice versa.
- And W/C is directly related to workability because if the water-cement ratio increases then the concrete gets wetter and more consistent and can be placed easily.
Size of Aggregates
- Finer aggregate requires more water because of larger surface area, hence aggregate with finer particles need more water to make it workable.
- On the other hand, bigger particles have less surface area,and therefore demand less water for wetting surface and require less amount of paste for lubricating.
- So bigger particles gives higher workability for fixed water content.
The Shape of Aggregates
- Irregular shape and rougher texture of angular aggregate require more water as compared with the round shaped aggregate.
- For fixed volume or weight, rounded particles has lesser surface area and lesser voids.
- Hence round shaped aggregates gives higher workability than angular, flaky or elongated aggregates.
Concrete Maturity
- Concrete maturity reflects how far curing has progressed.
- Maturity is the relationship between concrete temperature, time, and strength gain.
From above information we can conclude that only statement 1 is correct and rest of them are incorrect.
Last updated on May 28, 2025
-> SSC JE notification 2025 for Civil Engineering will be released on June 30.
-> Candidates can fill the SSC JE CE application from June 30 to July 21.
-> The selection process of the candidates for the SSC Junior Engineer post consists of Paper I, Paper II, Document Verification, and Medical Examination.
-> Candidates who will get selected will get a salary range between Rs. 35,400/- to Rs. 1,12,400/-.
-> Candidates must refer to the SSC JE Previous Year Papers and SSC JE Civil Mock Test, SSC JE Electrical Mock Test, and SSC JE Mechanical Mock Test to understand the type of questions coming in the examination.
-> The Staff Selection Commission conducts the SSC JE exam to recruit Junior Engineers in different disciplines under various departments of the Central Government.