HW1- It is required to design a M20 grade concrete mix having a slump of the order of 25 mm for foundation of structure likely to be subjected to moderate exposure conditions during its service life. The contractor will exercise good quality control, and standard deviation estimated from past records is 4.8 MPa (for more than 30 samples). Test results of the material available at the site are the following: Coarse Aggregate: Round gravel aggregate; specific gravity =2.68; water absorption =1.46; bulk density kg/m³ (dry and compacted) 1600. Fine Aggregate: natural river sand; specific gravity = 2.6; water absorption= 0.5; Durability requirements: Maximum allowable w/c ratio= 0.55Minimum cement content for moderate exposure= 300 kg/m³. Sieve size (mm) Cumulative % passing Sieve size (mm) Cumulative % passing Sieve analysis of sand 4.75 2.36 95.4 90.6 0.15 1.18 0.6 0.3 82.2 54.4 26.6 2.9 Sieve analysis of coarse aggregate 20 95 40 100 10 25.6 4.75 3.3 2.36 0 pan 0 pan 2 Estimate the quantity of materials for 30 m³ of concrete and the required adjustment to mix proportion if the free surface moisture of sand is 1.4 and for coarse aggregate is zero.
HW1- It is required to design a M20 grade concrete mix having a slump of the order of 25 mm for foundation of structure likely to be subjected to moderate exposure conditions during its service life. The contractor will exercise good quality control, and standard deviation estimated from past records is 4.8 MPa (for more than 30 samples). Test results of the material available at the site are the following: Coarse Aggregate: Round gravel aggregate; specific gravity =2.68; water absorption =1.46; bulk density kg/m³ (dry and compacted) 1600. Fine Aggregate: natural river sand; specific gravity = 2.6; water absorption= 0.5; Durability requirements: Maximum allowable w/c ratio= 0.55Minimum cement content for moderate exposure= 300 kg/m³. Sieve size (mm) Cumulative % passing Sieve size (mm) Cumulative % passing Sieve analysis of sand 4.75 2.36 95.4 90.6 0.15 1.18 0.6 0.3 82.2 54.4 26.6 2.9 Sieve analysis of coarse aggregate 20 95 40 100 10 25.6 4.75 3.3 2.36 0 pan 0 pan 2 Estimate the quantity of materials for 30 m³ of concrete and the required adjustment to mix proportion if the free surface moisture of sand is 1.4 and for coarse aggregate is zero.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:HW1- It is required to design a M20 grade concrete mix having a slump of the order of 25 mm for
foundation of structure likely to be subjected to moderate exposure conditions during its service life.
The contractor will exercise good quality control, and standard deviation estimated from past
records is 4.8 MPa (for more than 30 samples). Test results of the material available at the site are
the following:
Coarse Aggregate: Round gravel aggregate; specific gravity =2.68; water absorption =1.46; bulk
density kg/m³ (dry and compacted) 1600.
Fine Aggregate: natural river sand; specific gravity = 2.6; water absorption= 0.5;
Durability requirements: Maximum allowable w/c ratio= 0.55Minimum cement content for moderate
exposure= 300 kg/m³.
Sieve size (mm)
Cumulative % passing
Sieve size (mm)
Cumulative % passing
4.75
95.4
Sieve analysis of sand
1.18
82.2
2.36
90.6
40
100
Sieve analysis of coarse aggregate
20
95
0.6
54.4
10
25.6
4.75
3.3
0.3
26.6
2.36
0
0.15
2.9
pan
0
pan
2
Estimate the quantity of materials for 30 m³ of concrete and the required adjustment to mix proportion if the
free surface moisture of sand is 1.4 and for coarse aggregate is zero.
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Step 1: Given
VIEWStep 2: Calculate amount of mixing water and air
VIEWStep 3: Calculate water cement ratio and cement content
VIEWStep 4: Calculation of fineness modulus of sand
VIEWStep 5: Calculation of coarse aggregate
VIEWStep 6: Calculation of fine aggregate
VIEWStep 7: Correction in mixing water and aggregates
VIEWStep 8: Calculate quantity of each material for 30 cubic meter concrete
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