Identify the FALSE statement from the following options:
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Always remember that curing conditions and moisture content significantly influence the compressive strength of concrete. Proper curing leads to better hydration and, hence, higher strength.
The compressive strength of a concrete test specimen can vary depending on its shape and size
Air-dried and saturated test specimens show the same compressive strength for concrete
Curing conditions, such as temperature and relative humidity, can influence the compressive strength of concrete
Compressive strength depends on the water-to-binder ratio used in the concrete mixture
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The Correct Option isB
Solution and Explanation
The compressive strength of concrete is influenced by various factors such as curing conditions, moisture content, and the water-to-binder ratio. Let's examine each option:
(A) The compressive strength of concrete can indeed vary based on the shape and size of the test specimen. Larger or differently shaped specimens can show different strengths due to factors like the distribution of stress and the length of the specimen. Thus, this statement is TRUE.
(B) Air-dried and saturated test specimens do not show the same compressive strength. Saturated specimens have higher strength than air-dried ones because the presence of water in the specimen contributes to the hydration of the cement particles, making the concrete stronger. Thus, this statement is FALSE.
(C) Curing conditions, including temperature and relative humidity, have a significant impact on the compressive strength of concrete. Proper curing ensures the hydration process continues effectively, improving the strength of the concrete. This statement is TRUE.
(D) The water-to-binder ratio is one of the most critical factors in determining the compressive strength of concrete. A lower water-to-binder ratio generally results in higher strength, as the hydration process is more efficient with less water. This statement is TRUE.
