1. Following data are given for designing a Portland cement concrete mix for a nonstructural sidewalk slab: • Design strength f´c= 26 MPa • Standard deviation of f´c obtained from 25 tests=1.4 MPa • Freezing and thawing and exposed to chlorides • Use air entrained concrete • Slab thickness= 300 mm • Fineness modulus of fine aggregate=2.7 • 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 • Type I cement, relative density=3.1 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.
1. Following data are given for designing a Portland cement concrete mix for a nonstructural sidewalk slab:
• Design strength f´c= 26 MPa
• Standard deviation of f´c obtained from 25 tests=1.4 MPa
• Freezing and thawing and exposed to chlorides
• Use air entrained concrete
• Slab thickness= 300 mm
• Fineness modulus of fine aggregate=2.7
• 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
• Type I cement, relative density=3.1
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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