CSLB Concrete C8 License Practice Test #2 Questions And 100% Verified Solutions

CSLB Concrete C8 License Practice Test #2 Questions And 100% Verified Solutions The size of the vibration needle to be used for concrete vibration for slab is ______________ inch. - ANSWER 3/4" (20mm) Explanation: It is based on the thickness of the slab, generally 3/4" needle is used and in rare cases 1 1/2" needle is also used. What are the compliance requirements that the concrete must meet to pass the acceptance test? - ANSWER ALL OF THESE! -Homogeneity -Strength -Workability The additives used to enhance the performance of concrete for the special purposes is/are called: - ANSWER Chemicals Explanation: Shall not be confused with admixtures Which of the following are the factors that affect the pulse velocity measurement on concrete? - ANSWER ALL OF THESE! Explanation: -Temperature on concrete -Presence of reinforcing steel -Smoothness of the surface Which of the following is NOT a concrete curing method? - ANSWER Water entrapment curing "Specific performance admixtures" are the admixtures that can provide a desired performance characteristics other than: - ANSWER ALL OF THESE -Reducing water content -Changing the setting time -Changing the functionality Construction joints in the pavement are generally created by ___________________. - ANSWER ALL OF THESE! -Scoring concrete with a grooving tool -Rounding corners with the edger tools -Saw cutting the hard concrete The average of the expansion of the aggregate at 16 days when tested in conformance with the requirements is less than or equal to ____________ percent. - ANSWER .15 Explanation: For one year and less the expansion limit is .040 percent The cement type that is recommended for rapid construction or cold weather is __________________. - ANSWER Type ||| According to Caltrans recommendations, air entraining admixtures are used in concrete in the climate zone _______________. - ANSWER ||| Explanation: Area ||| is classified as a severe climate, where freeze-thaw cycles and heavy salting occurs frequently and where chains are used. What is the minimum depth of excavation for the curbs below the sub grade? - ANSWER 6" In locations where fine aggregate is expensive or scarce, what can be used as an economical partial replacement? - ANSWER Air entraining admixtures Explanation: This is the air bubble that expands to reduce the requirements of fine aggregates, it also enhances the workability of fresh concrete and in turn reduces the water requirements. The activities carried out during concreting include but are not limited to: - ANSWER ALL OF THESE! -Batching -Placing -Compacting Explanation: In addition it includes mixing, transporting, curing etc. The function / value of the poissons ratio generally ___________________ with concrete mixing. - ANSWER Increases Explanation: Richer the mix, higher the value The minimum level at which the aggregates being tested is expected to comply, is referred to as - ANSWER Threshold Which of the following tools will be used to finish concrete that requires a dense and smooth finish? - ANSWER Steel trowel The cement type that is recommended for precast concrete elements is ____________________. - ANSWER Type