Compressive Strength of Rock Cores at Natural Moisture Content
Compressive Strength of Rock Cores at Natural Moisture Content
(OP)
FHWA Drilled Shaft Manual (section 13.3.5.3) requires uniaxial compressive strength testing of the rock at its natural moisture content. How can you get cores at natural moisture content when you are coring with water? This is also a requirement of ASTM 4543. Thanks!





RE: Compressive Strength of Rock Cores at Natural Moisture Content
What I have done in the past is just tried to approach it with a little practicality...
For relatively non-absorptive rock we often follow ASTM C42 which is for compressive strength of concrete cores. Section 7.3 deals with moisture conditioning. Since the concrete cores are obtained in much the same manner as NQ & NX (wet) rock coring techniques - we often follow this method for testing the unconfined compressive strength of rock cores.
For absorptive rock - like some water sensitive shales - we do down-hole pressure-meter testing - assuming we can dry-drill (solid stem augers) to the test level.
RE: Compressive Strength of Rock Cores at Natural Moisture Content
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ípapß gordo ainÆt no madre flaca!
RE: Compressive Strength of Rock Cores at Natural Moisture Content
RE: Compressive Strength of Rock Cores at Natural Moisture Content