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首页> 美国政府科技报告 >Development of Laboratory and Field Methods for Detecting D-Cracking Susceptibility of Ohio Coarse Aggregates in Concrete Pavements
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Development of Laboratory and Field Methods for Detecting D-Cracking Susceptibility of Ohio Coarse Aggregates in Concrete Pavements

机译：添加到阅览室添加到阅览室阅读软件下载阅读软件下载与<<检测混凝土路面俄亥俄粗骨料D-裂纹敏感性的实验室和现场方法研究>>

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The phenomenon known as D-cracking cannot be detected in concrete pavements, prior to its appearance at the surface, by any non-destructive method other than coring. Several potential methods of detection available to the researchers were investigated on test slabs and actual pavements without success. Drilling of cores near the intersection of the logitudinal and transverse joints and visual examination of these cores will detect the advent and/or extent of D-cracking near the bottom of a pavement slab. Several laboratory test methods were analyzed which it was hoped would indicate the D-cracking susceptibility of coarse aggregates, when used in concrete for pavement slabs. Two methods were modified versions of ASTM C-666 A and B, two were unconfined freeze-thaw tests of the aggregate and the remaining two were standard sodium and magnesium soundness tests. The major modification of the ASTM C-666 test methods was to substitute the elongation of the test specimens measured as they undergo cycles of freezing and thawing for the weight loss determinations or sonic modulus determination. Further modifications included plotting the percent expansion against the number of cycles completed and calculating the area under the curve generated.

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