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Advances in Civil Engineering
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Advances in Civil Engineering
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2019
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Article
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Tab 6
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Research Article
Selection of Optimal Threshold of Generalised Rock Quality Designation Based on Modified Blockiness Index
Table 6
Standard ratings of RQD.
RQD
90–100
75–90
50–75
25–50
<25
Rating
I
II
III
IV
V
Description
Very good
Good
Fair
Poor
Very poor