Q.Using the American Method, design a concrete mix for a continuous foundation with a cross section of 1500 mm (Width) x 400 mm (Depth). The smallest spacing between reinforcing steel is 200 mm. The average compressive strength required for the concrete at 28 days is 35 MPa and slump to be in the range of 30-50 mm. The foundation is extremely exposed to brackish water in a cold climate. The raw materials used for this concrete have the following properties: Cement used is Sulphate resistant Portland cement with a specific gravity of 3.15. The available coarse aggregate has a maximum size of 25 mm, a dry-rodded unit weight of 1745 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.45% and moisture content (OD) of 0.27%. The fine aggregate has a bulk specific gravity (SSD) of 2.6 and a fineness modulus of 2.40, absorption capacity of 1.4%, a moisture content (SSD) of 2.9%. The aggregates conform to the ASTM C33-84 requirements for grading. Note: Use the Volume method when calculating the sand Note :Just choose one of these answers by typing the number and the letter 1. the slump A.30-50 B.80-100 C.20-100 D.20-80 2.maximum aggregate size A.10 B.20 C.25 D.12.5 3.determine whether the concrete is A.air-entrained B.non air-entrained 4.the recommended mixing water amount is A.175 B.180 C.185 D.160 5.Average total air content A.6 B.5 C.0 D.3 6.w/c ratio is A. 0.40 B. 0.5 c. 0.35 D. 0.45 7.cement content is A.400 B.480 C.345 D.440 8.Volume of dry-rodded coarse aggregate per unit volume of concrete is A. 0.71 B. 0.59 C. 0.66 D. 0.12 9.The SSD weight of Coarse Aggregate is A. 1235.54 B.1336.23 C. 1310.63 D. 1244.52 10.Estimate of fine aggregate content (SSD) using the Volume Method is A. 503.5 B. 499.2 C. 510.5 D. 480.3 11.Stock weight of Course aggregate (W stock) is A. 1242.3 B. 1262.1 C. 1252.2 D. 1232.4 12.Stock weight of Fine aggregate (W stock) is * A. 513.68 B. 535.7 C. 567.6 D. 520.56 13.Mixing water after Adjustment is * A. 143.9 B. 159.64 C. 147.74 D. 157.8
Q.Using the American Method, design a concrete mix for a continuous foundation with a cross section of 1500 mm (Width) x 400 mm (Depth). The smallest spacing between reinforcing steel is 200 mm. The average compressive strength required for the concrete at 28 days is 35 MPa and slump to be in the range of 30-50 mm. The foundation is extremely exposed to brackish water in a cold climate. The raw materials used for this concrete have the following properties: Cement used is Sulphate resistant Portland cement with a specific gravity of 3.15. The available coarse aggregate has a maximum size of 25 mm, a dry-rodded unit weight of 1745 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.45% and moisture content (OD) of 0.27%. The fine aggregate has a bulk specific gravity (SSD) of 2.6 and a fineness modulus of 2.40, absorption capacity of 1.4%, a moisture content (SSD) of 2.9%. The aggregates conform to the ASTM C33-84 requirements for grading. Note: Use the Volume method when calculating the sand Note :Just choose one of these answers by typing the number and the letter 1. the slump A.30-50 B.80-100 C.20-100 D.20-80 2.maximum aggregate size A.10 B.20 C.25 D.12.5 3.determine whether the concrete is A.air-entrained B.non air-entrained 4.the recommended mixing water amount is A.175 B.180 C.185 D.160 5.Average total air content A.6 B.5 C.0 D.3 6.w/c ratio is A. 0.40 B. 0.5 c. 0.35 D. 0.45 7.cement content is A.400 B.480 C.345 D.440 8.Volume of dry-rodded coarse aggregate per unit volume of concrete is A. 0.71 B. 0.59 C. 0.66 D. 0.12 9.The SSD weight of Coarse Aggregate is A. 1235.54 B.1336.23 C. 1310.63 D. 1244.52 10.Estimate of fine aggregate content (SSD) using the Volume Method is A. 503.5 B. 499.2 C. 510.5 D. 480.3 11.Stock weight of Course aggregate (W stock) is A. 1242.3 B. 1262.1 C. 1252.2 D. 1232.4 12.Stock weight of Fine aggregate (W stock) is * A. 513.68 B. 535.7 C. 567.6 D. 520.56 13.Mixing water after Adjustment is * A. 143.9 B. 159.64 C. 147.74 D. 157.8
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Q.Using the American Method, design a concrete mix for a continuous foundation with a cross section of 1500 mm (Width) x 400 mm (Depth). The smallest spacing between reinforcing steel is 200 mm. The average compressive strength required for the concrete at 28 days is 35 MPa and slump to be in the range of 30-50 mm. The foundation is extremely exposed to brackish water in a cold climate. The raw materials used for this concrete have the following properties: Cement used is Sulphate resistant Portland cement with a specific gravity of 3.15. The available coarse aggregate has a maximum size of 25 mm, a dry-rodded unit weight of 1745 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.45% and moisture content (OD) of 0.27%. The fine aggregate has a bulk specific gravity (SSD) of 2.6 and a fineness modulus of 2.40, absorption capacity of 1.4%, a moisture content (SSD) of 2.9%. The aggregates conform to the ASTM C33-84 requirements for grading. Note: Use the Volume method when calculating the sand
Note :Just choose one of these answers by typing the number and the letter
1. the slump
A.30-50
B.80-100
C.20-100
D.20-80
2.maximum aggregate size
A.10
B.20
C.25
D.12.5
3.determine whether the concrete is
A.air-entrained
B.non air-entrained
4.the recommended mixing water amount is
A.175
B.180
C.185
D.160
5.Average total air content
A.6
B.5
C.0
D.3
6.w/c ratio is
A. 0.40
B. 0.5
c. 0.35
D. 0.45
7.cement content is
A.400
B.480
C.345
D.440
8.Volume of dry-rodded coarse aggregate per unit volume of concrete is
A. 0.71
B. 0.59
C. 0.66
D. 0.12
9.The SSD weight of Coarse Aggregate is
A. 1235.54
B.1336.23
C. 1310.63
D. 1244.52
10.Estimate of fine aggregate content (SSD) using the Volume Method is
A. 503.5
B. 499.2
C. 510.5
D. 480.3
11.Stock weight of Course aggregate (W stock) is
A. 1242.3
B. 1262.1
C. 1252.2
D. 1232.4
12.Stock weight of Fine aggregate (W stock) is *
A. 513.68
B. 535.7
C. 567.6
D. 520.56
13.Mixing water after Adjustment is *
A. 143.9
B. 159.64
C. 147.74
D. 157.8
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