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?
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?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:%CBR According to Iraqi Specification for different layers:
Layers
Compacted sub grade
Sub-Base
Base
%CBR (lower limit)
4%
30%
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
Penetration (mm) 0 0.5 1 1.5 2 25 3
Load (Kg)
No. of Blows
MDD, gm/cm³
0 15 40 85 140 220 300 455 611 959
Table 2: MDD and CBR values for 10, 25 and 56 blows
25
2.07
29
?
4 5 7.5 10 12.5
1120
1100
CBR%
CBR% at 95% MDD
10
1.95
24
56
2.2
?
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