Question

A concrete masonry unit is tested for compressive strength and produces the following results: Failure load = 100000 lb Gross area = 170 in2 Gross volume = 960 in3 Net volume = 836 in3 Please round to the nearest hundredth (i.e., 0.01). 1. What is the percentage of net cross-sectional area? = Answer % 2. Is the unit categorized as solid or hollow? Write down either solid or hollow. No spaces, and case is unimportant. Answer 3. What is the net area? = Answer in2 4. What is the net area compressive strength? = Answer psi 5. Does the compressive strength satisfy the ASTM requirements for load bearing units? Write down either yes or no. No spaces, and case is unimportant. Answer

Answer #1

A concrete masonry unit is tested for compressive strength and
produces the following results:
Failure
load = 120,000 lb
Gross
area = 130 in2
Gross
volume = 960 in3
Net
volume = 447 in3
Is the unit categorized as solid or hollow? Why? What is the
compressive strength? Does the compressive strength satisfy the
ASTM requirements for load bearing units shown in Table 8.2?

A concrete masonry unit was tested for compressive strength and
produced the following results:
Failure load = 750 kN
Gross area = 0.085 m2
Gross volume = 0.013 m3
Net volume = 0.008 m3
Is the unit categorized as solid or hollow?
What is the compressive strength? Does the compressive strength
satisfy the ASTM requirements for load bearing units?

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