Post by yag on Apr 11, 2015 23:09:08 GMT -5
Slump indicators DO NOT "measure" slump. They measure hydraulic resistance. There is only one method for determing slump and it is found in the ASTM guidelines. In fact, the only applicable use of the word slump is if it's used in relation to the accepted slump test procedure.
ASTM C-143
Standard Test Method for Slump of Hydraulic-Cement Concrete
9.2 Bias
"This test method has no bias since slump is deļ¬ned only in terms of this test method"
Everything is else is just opinion.
Even the accepted test procedure has tolerances (precision) like plus or minus 1 or 1.5 inches for a 4 inch slump so the test really doesn't prove anything either
Read ASTM C-143
ASTM C-143
Standard Test Method for Slump of Hydraulic-Cement Concrete
9.2 Bias
"This test method has no bias since slump is deļ¬ned only in terms of this test method"
Everything is else is just opinion.
Even the accepted test procedure has tolerances (precision) like plus or minus 1 or 1.5 inches for a 4 inch slump so the test really doesn't prove anything either
Read ASTM C-143