Core TradesQuestion 124 of 700
Assuming proper placement and curing, which change to a concrete mix will produce the GREATEST increase in compressive strength?
a.Adding extra mixing water to improve workability
b.Lowering the water-cement ratio
c.Increasing the slump
d.Adding more fine aggregate
Explanation
Compressive strength is governed primarily by the water-cement ratio; a lower ratio yields a denser, stronger cement paste. Adding water or increasing slump raises the water-cement ratio and weakens the concrete. Adding fine aggregate changes gradation and workability but does not directly increase strength.
Practice all 700 questions free — no signup required.
Related questions on this topic
- Under normal ambient conditions, what is the MINIMUM period that standard structural concrete should be kept continuously moist to develop adequate strength and durability?
- What is the MINIMUM concrete cover required to protect reinforcing steel in concrete that is cast against and permanently exposed to earth?
- A rectangular slab measures 30 ft by 40 ft and is 4 inches thick. How many cubic yards of concrete are needed (before any waste allowance)?
- For a one-story wood-frame dwelling on stable soil with no deeper frost-line requirement, what is the MINIMUM depth below the undisturbed ground surface to the bottom of an exterior footing?
- The primary purpose of providing an adequate lap length where two reinforcing bars overlap is to:
- A continuous footing is 12 inches wide, 12 inches deep, and 60 feet long. How many cubic yards of concrete are required (before waste)?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review