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原文传递 KANSAS EXPERIENCE WITH STRATEGIC HIGHWAY RESEARCH PROGRAM WASHINGTON HYDRAULIC FRACTURE INDEX TEST.

题名：	KANSAS EXPERIENCE WITH STRATEGIC HIGHWAY RESEARCH PROGRAM WASHINGTON HYDRAULIC FRACTURE INDEX TEST.
作者：	Zubery-MH; Hossain-M; Clowers-KC
关键词：	BASE-COURSES; AGGREGATES-; FREEZE-THAW-DURABILITY; TEST-METHODS; STRATEGIC-HIGHWAY-RESEARCH-PROGRAM; AGGREGATE-TESTING; LIMESTONE-AGGREGATES; KANSAS-; CORRELATIONS-; ASTM-C666; TEST-SPECIMENS; FROST-SUSCEPTIBILITY; CONCRETE-PRISM-SPECIMENS
摘要：	D-cracking due to frost-susceptible coarse aggregates has been a problem on Kansas pavements since the 1930s. However, a reliable, reproducible, easily performed, and inexpensive test method for rapidly assessing the freeze-thaw durability of aggregates is yet to be developed. A method was developed in the Strategic Highway Research Program (SHRP)--the Washington hydraulic fracture index (WHFI) test--apparently capable of identifying nondurable aggregates in about 8 days. Thirty-two limestone aggregates from Kansas sources were tested according to the WHFI procedure. A comparison of existing Kansas criteria for durable aggregates and the percentage fracture values obtained in the WHFI tests indicates that if 5% or more fracture percentage is used as the failure criterion, then 14 out of 32 aggregates (44%) are identified correctly with respect to the durability criterion. For 3% or more fracture percentage, 18 out of 32 aggregates (56%) are identified correctly. A correlation study shows that the WHFI test results are correlated significantly with the results of the freeze-thaw tests of the Kansas Department of Transportation on unconfined aggregates. However, the WHFI test results are poorly correlated with the results of ASTM C666 tests on concrete prism specimens of these aggregates. Since ASTM C666 is universally accepted to predict the frost-susceptibility of aggregates in concrete, the SHRP WHFI test method, in its current form, does not appear to be a viable choice to replace it. However, if the WHFI test can be modified to test concrete prisms, better correlations with ASTM C666 results can be expected.
总页数：	Transportation Research Record. 1997. (1577) pp45-52 (5 Fig., 4 Tab., 9 Ref.)
报告类型：	科技报告