Effects of Setup and Material Parameters on the Standard Test for Strand Bond
Date Issued
September 2013
Abstract
ASTM recently adopted the Standard Test Method for Evaluating Bond of
Seven-Wire Steel Prestressing Strand as ASTM A 1081. The precision and
bias statement for this test method has not however been developed. The first
step in developing the precision and bias statement is to perform a ruggedness
study to determine how the results are affected by allowable variations in
methods and materials. A ruggedness study was performed for ASTM A 1081
as the first step in an ongoing interlaboratory study to determent the test
method precision and bias. After an initial survey of the pull-out strength of
North American Strand in mortar, three strands of differing pull-out strengths
were selected for inclusion in the ruggedness study. During this study, the
mortar flow, compressive strength at testing, and test loading rate were varied
in order to determine their effect on the test results. The results showed that
flow was a significant variable in the testing program.
Seven-Wire Steel Prestressing Strand as ASTM A 1081. The precision and
bias statement for this test method has not however been developed. The first
step in developing the precision and bias statement is to perform a ruggedness
study to determine how the results are affected by allowable variations in
methods and materials. A ruggedness study was performed for ASTM A 1081
as the first step in an ongoing interlaboratory study to determent the test
method precision and bias. After an initial survey of the pull-out strength of
North American Strand in mortar, three strands of differing pull-out strengths
were selected for inclusion in the ruggedness study. During this study, the
mortar flow, compressive strength at testing, and test loading rate were varied
in order to determine their effect on the test results. The results showed that
flow was a significant variable in the testing program.
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