Concrete is required for a sidewalk in NJ. A specified compressive strength, f'c, of 3800 psi is required at 28 days using an ASTM C 150 Type I portland cement. The design calls for a minimum of 2 in. of concrete cover over the reinforcing steel. The minimum distance between reinforcing bars is 3 in. The slab is 4 in thick. A slump of 5 inches should be the target. The sidewalk located in a severe climate (freezing/thawing, moist conditions and presence of deicing chemicals should be expected). No statistical data on previous mixes are available. Materials Available: ASTM C 150 Type VII Cement Relative density of 3.15 Coarse Aggregate: well-graded ¾ in. maximum-size aggregate (MSA), local river gravel Oven-dry specific gravity: 2.8 Absorption: 0.87% Oven-dry rodded bulk density: 96 lb/fA Moisture content of coarse stockpile: 0.60% Fine Aggregate: well-graded natural sand Oven-dry specific gravity: 2.4 Absorption: 2.0% Moisture content of fine stockpile: 5.0% Fineness Modulus: 2.6 A commercially available air-entraining admixture is supplied. The manufacturer recommends 3 fl oz per 100 lbs of cement as a dosage range which will give the required air content. In your design you should recommend a target value of +/-1 % of the desired air content. However, your design should be based on the maximum value (e.g. + 1%). Determine: a. The theoretical mixture proportions of all concrete constituents (fine aggregate, coarse aggregate, water, cement, chemical admixtures) based on 1 yd of concrete on an oven dry basis for aggregates. b. The as-batched mixture proportions based on the moisture contents provided in the materials available section. c. How much concrete would you need for 20 feet of sidewalk
Concrete is required for a sidewalk in NJ. A specified compressive strength, f'c, of 3800 psi is required at 28 days using an ASTM C 150 Type I portland cement. The design calls for a minimum of 2 in. of concrete cover over the reinforcing steel. The minimum distance between reinforcing bars is 3 in. The slab is 4 in thick. A slump of 5 inches should be the target. The sidewalk located in a severe climate (freezing/thawing, moist conditions and presence of deicing chemicals should be expected). No statistical data on previous mixes are available. Materials Available: ASTM C 150 Type VII Cement Relative density of 3.15 Coarse Aggregate: well-graded ¾ in. maximum-size aggregate (MSA), local river gravel Oven-dry specific gravity: 2.8 Absorption: 0.87% Oven-dry rodded bulk density: 96 lb/fA Moisture content of coarse stockpile: 0.60% Fine Aggregate: well-graded natural sand Oven-dry specific gravity: 2.4 Absorption: 2.0% Moisture content of fine stockpile: 5.0% Fineness Modulus: 2.6 A commercially available air-entraining admixture is supplied. The manufacturer recommends 3 fl oz per 100 lbs of cement as a dosage range which will give the required air content. In your design you should recommend a target value of +/-1 % of the desired air content. However, your design should be based on the maximum value (e.g. + 1%). Determine: a. The theoretical mixture proportions of all concrete constituents (fine aggregate, coarse aggregate, water, cement, chemical admixtures) based on 1 yd of concrete on an oven dry basis for aggregates. b. The as-batched mixture proportions based on the moisture contents provided in the materials available section. c. How much concrete would you need for 20 feet of sidewalk
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Concrete is required for a sidewalk in NJ. A specified compressive strength, f'c, of 3800 psi is
required at 28 days using an ASTM C 150 Type I portland cement. The design calls for a minimum
of 2 in. of concrete cover over the reinforcing steel. The minimum distance between reinforcing
bars is 3 in. The slab is 4 in thick. A slump of 5 inches should be the target. The sidewalk located
in a severe climate (freezing/thawing, moist conditions and presence of deicing chemicals should
be expected). No statistical data on previous mixes are available.
Materials Available:
ASTM C 150 Type I/II Cement
Relative density of 3.15
Coarse Aggregate: well-graded ¼ in. maximum-size aggregate (MSA), local river gravel
Oven-dry specific gravity: 2.8
Absorption: 0.87%
Oven-dry rodded bulk density: 96 lb/ft
Moisture content of coarse stockpile: 0.60%
Fine Aggregate: well-graded natural sand
Oven-dry specific gravity: 2.4
Absorption: 2.0%
Moisture content of fine stockpile: 5.0%
Fineness Modulus: 2.6
A commercially available air-entraining admixture is supplied. The manufacturer recommends 3
fl oz per 100 lbs of cement as a dosage range which will give the required air content. In your
design you should recommend a target value of +/-1 % of the desired air content. However, your
design should be based on the maximum value (e.g. + 1%).
Determine:
a. The theoretical mixture proportions of all concrete constituents (fine aggregate, coarse
aggregate, water, cement, chemical admixtures) based on 1 yd²of concrete on an oven
dry basis for aggregates.
b. The as-batched mixture proportions based on the moisture contents provided in the
materials available section.
c. How much concrete would you need for 20 feet of sidewalk
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