Question Two: The laboratory test data for a modified Proctor test and CBR test for (crushed limestone) are given below; Find the CBR value at 95% of MDD after necessary corrections, for the tested sample depending on Iraqi Specifications, R6 (after drawing the curve and stating your answer about which sort of sub-bases materials are used in highway construction? Table 1: CBR test data @56 blows 56 Blows Penetration (mm) 0 0.5 1 1.5 2 25 34 5 75 10 12.5 Load (Kg) 0 15 40 85 140 220 300 455 611 959 1120 1100 Table 2: MDD and CBR values for 10, 25 and 56 blows No. of Blows 10 25 56 MDD, gm/cm³ 1.95 2.07 2.2 CBR% 24 29 ? CBR% at 95% MDD ?
Question Two: The laboratory test data for a modified Proctor test and CBR test for (crushed limestone) are given below; Find the CBR value at 95% of MDD after necessary corrections, for the tested sample depending on Iraqi Specifications, R6 (after drawing the curve and stating your answer about which sort of sub-bases materials are used in highway construction? Table 1: CBR test data @56 blows 56 Blows Penetration (mm) 0 0.5 1 1.5 2 25 34 5 75 10 12.5 Load (Kg) 0 15 40 85 140 220 300 455 611 959 1120 1100 Table 2: MDD and CBR values for 10, 25 and 56 blows No. of Blows 10 25 56 MDD, gm/cm³ 1.95 2.07 2.2 CBR% 24 29 ? CBR% at 95% MDD ?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Transcribed Image Text:%CBR According to Iraqi Specification for different layers:
Layers
%CBR (lower limit)
Compacted sub grade
4 %
Sub-Base
30 %
Base
35 %
Transcribed Image Text:Question Two:
The laboratory test data for a modified Proctor test and CBR test for (crushed
limestone) are given below; Find the CBR value at 95% of MDD after necessary
corrections, for the tested sample depending on Iraqi Specifications, R6 (after
drawing the curve and stating your answer about which sort of sub-bases materials
are used in highway construction?
Table 1: CBR test data @56 blows
56 Blows
0.5 1 15 2.
15 40 85 140 220 300 | 455 611
Penetration(mm)
25-3
5
7.5
10
12.5
Load (Kg)
959
1120
1100
Table 2: MDD and CBR values for 10, 25 and 56 blows
No. of Blows
10
25
56
MDD, gm/cm
1.95
2.07
2.2
CBR%
24
29
CBR% at 95% MDD
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