Core TradesQuestion 10 of 700
During hot-weather concreting, plastic shrinkage cracking is BEST prevented by:
a.Increasing the mixing water to raise the slump
b.Adding an accelerating admixture to speed the set
c.Delaying all curing until the next day
d.Reducing surface moisture loss by shading, wind breaks, and prompt curing
Explanation
Plastic shrinkage cracks form when the surface dries faster than bleed water rises, so limiting evaporation with shading, wind breaks, fog, and prompt curing is the fix. Adding water weakens the concrete, an accelerator worsens rapid drying, and delaying curing increases moisture loss.
Law Reference: 2025 CA Building Code (CBC) Chapter 19 (Concrete)Practice all 700 questions free — no signup required.
Related questions on this topic
- A No. 5 reinforcing bar has a nominal diameter of 5/8 inch. If the specified tension lap splice is 40 bar diameters, what is the MINIMUM lap length?
- For a typical residential interior slab-on-ground, what is a common MINIMUM slab thickness?
- When placing concrete in cold weather, fresh concrete must generally be protected from freezing until it reaches a compressive strength of at least about:
- Six cylindrical concrete piers are each 18 inches in diameter and 4 feet deep. Approximately how many cubic yards of concrete are needed for all six?
- A rectangular slab measures 20 feet by 25 feet and is 5 inches thick. Approximately how many cubic yards of concrete does it require?
- Mechanical vibration of freshly placed concrete is done PRIMARILY to:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review