Using the following data for an unreinforced PCC Pavement slab:■ Design strength f′ c = 28 MPa■ Slab thickness = 300 mm■ Standard deviation of f′ c obtained from 20 samples = 1.4 MPa■ Ignore any exposure requirement■ Use air-entrained concrete■ Fineness modulus of fine aggregate = 2.60■ Maximum aggregate size = 50 mm and nominal maximum aggregatesize = 37.5 mm■ Bulk oven-dry specific gravity of coarse aggregate = 2.6■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3Find the following:a. Required compressive strengthb. w/c ratioc. Coarse aggregate amount (kg/m3)d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregateincrease, decrease or remain the same? Explain your answer.
Using the following data for an unreinforced PCC Pavement slab:
■ Design strength f′ c = 28 MPa
■ Slab thickness = 300 mm
■ Standard deviation of f′ c obtained from 20 samples = 1.4 MPa
■ Ignore any exposure requirement
■ Use air-entrained concrete
■ Fineness modulus of fine aggregate = 2.60
■ Maximum aggregate size = 50 mm and nominal maximum aggregate
size = 37.5 mm
■ Bulk oven-dry specific gravity of coarse aggregate = 2.6
■ Oven-dry rodded density of coarse aggregate = 2002 kg/m3
Find the following:
a. Required compressive strength
b. w/c ratio
c. Coarse aggregate amount (kg/m3)
d. If the w/c ratio is 10% reduced, will the quantity of coarse aggregate
increase, decrease or remain the same? Explain your answer.
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