Ingredients
What are water, aggregate, and Portland cement?
TWO reasons concrete may crack.
What are improper temperature and incorrect water ratio?
The unit in which concrete is measured.
What are cubic yards?
The tool that smooths and rounds corners in concrete laying.
What is an edger?
The ideal temperature range when curing concrete.
What is above 50 degrees F but below 90 degrees F?
The ideal starting ratio for mixing concrete.
What is 1 part cement, 2 parts fine aggregate, and 3 parts coarse aggregate?
The type of failure that does not give any indication before it fully breaks.
What is brittle failure?
The amount of cement needed for a pad that is 6’ x 12’ and 3 inches thick.
What is .66 cubic yards?
The tool that levels the top of the concrete.
What is a screed?
The difference between cement and concrete.
What is cement is an ingredient in concrete?
Also acceptable: cement is wet and concrete is hard.
An example of a fine aggregate.
What is sand?
The type of failure that give an indication it will happen by cracking before completely failing.
What is ductile failure?
The amount of concrete needed to pour a floor 4 inches thick, 20 feet wide and 32 feet long.
What is 7.9 cubic yards?
The tool responsible for smoothing the surface of concrete by pushing larger aggregates below the surface.
What is a bullfloat?
The definition of slump.
What is a measurement of concrete consistency?
An example of a coarse aggregate.
What is crushed rock, gravel, etc?
The biggest reason concrete on its own is not a good structural material.
What is concrete is strong in compression but weak in tension?
The amount of concrete needed to pour a silo that is 6" thick and 144' tall with a 12 ' diameter base.
What is 32 cubic yards?
The tool used second when smoothing concrete after it's been poured.
What is a bullfloat?
A disadvantage of rebar as a reinforcer for concrete.
What is steel lengthens with stress?
(Rebar can't start to help resist tension until it has had a chance to stretch out, usually waiting until after concrete has already begun to crack).
The ingredient that accounts for 60 - 80% of the concrete mixture.
What are aggregates?
The 2 biggest reasons reinforcers are added to concrete.
What are to add tensile strength and to change failure mode from brittle to ductile?
The amount of SAND that is needed in a mixture that is 3 - 2 - 1 for a pad that is 8' x 11' and 4 inches thick.
What is 0.36 yards?
((4/12) * 8 * 11) / 27 = 1.09 cubic yards
3 + 2 + 1 = 6
Sand is 2 parts (2/6 = 1/3)
1/3 * 1.09 = 0/36
The name of the tool with a handle extending from a flat blade.
What is an edger?
THREE famous structures made of concrete.
What are the Erie Canal, Grand Coulee Dam, and Hoover Dam?