'Shrinkage' of concrete is the volumetric reduction due to:
Choose the correct answer
Thermal expansion reversal only
Moisture loss (drying shrinkage primary), autogenous (low w/c), and plastic (before set) — affects PSC loss, deflection, cracking
Increase in curing temperature
Compressive loading
Correct Answer
B. Moisture loss (drying shrinkage primary), autogenous (low w/c), and plastic (before set) — affects PSC loss, deflection, cracking
Why is this the answer?
Concrete shrinkage types: (1) Drying shrinkage — loss of moisture to ambient air (most significant; 400–800 microstrain); (2) Autogenous — self-desiccation in low w/c concrete (capillary suction); (3) Plastic shrinkage — rapid surface drying before set (craze cracking); (4) Carbonation shrinkage — CaCO3 formation. Total shrinkage strain affects: prestress loss, deflection of beams, crack width. Reduced by: aggregate, lower w/c.
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