Q1. Using the British methods, design a concrete mix to bear an average compressive strength of 35 MPa at 28 days, to cast a room slab with the following dimensions (5 width × 4 length × 0.2 depth m) and 200 mm space distance of reinforcement. Consider the following properties: Cement used is type I Portland cement Required slump = 30 – 60 mm Coarse aggregate: • Crushed rocks • Maximum size of 40 mm, The fine aggregate: • Crushed rocks falls in zone 3 Assume zone A for figure 1 Assume K = 1.64
Q1. Using the British methods, design a concrete mix to bear an average compressive strength of 35 MPa at 28 days, to cast a room slab with the following dimensions (5 width × 4 length × 0.2 depth m) and 200 mm space distance of reinforcement. Consider the following properties: Cement used is type I Portland cement Required slump = 30 – 60 mm Coarse aggregate: • Crushed rocks • Maximum size of 40 mm, The fine aggregate: • Crushed rocks falls in zone 3 Assume zone A for figure 1 Assume K = 1.64
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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1.Target mean strength Fm (MPa). 1. 42.67 /2. 48.12 /3. 40.04 /4.45.67
2.Approximate for Compressive Strength ( MPa )
1.55
2.48
3.49
4.42
3.Water/cement ratio (w/c) is
1. 0.41
2. 0.35
3. 0.51
4. 0.61
4.The free water content is ( kg / m3 )
1. 190
2. 180
3. 205
4. 160
5.Cement content is ( kg / m3)
1. 362.5
2. 382.5
3. 392.5
4. 372.5
6.Estimate of the wet density of the fully compacted concrete (D) is (kg / m3)
1. 2320
2. 2520
3. 2420
4. 2220
7.Total Aggregate Content is ( kg / m3 )
1. 1657.5
2. 1757.5
3. 1457.5
4. 1857.5
8.the proportion of fine aggregate in the total aggregate is ( kg / m3 )
1. 492.95
2. 482.95
3. 582.95
4. 472.95
9.The Coarse aggregate is ( kg / m3 )
1. 1574.55
2. 1274.55
3. 1474.55
4. 1374.55
10.The summary of mix proportions ( PWSG )
1. 1:0.51:1.29:3.6
2. 1:0.35:1.19:3.9
3. 1:0.61:1.4:4.1
4. 1:0.41:1.20:2.9
Transcribed Image Text:Q1. Using the British methods, design a concrete mix to bear an average compressive strength
of 35 MPa at 28 days, to cast a room slab with the following dimensions (5 width x 4 length x
0.2 depth m) and 200 mm space distance of reinforcement. Consider the following properties:
Cement used is type I Portland cement
Required slump = 30 – 60 mm
Coarse aggregate:
Crushed rocks
Maximum size of 40 mm,
The fine aggregate:
Crushed rocks
1 falls in zone 3
Assume zone A for figure 1
Assume K = 1.64
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