QUALITY CONTROL TESTING METHOD FOR CRACK-RESISTANT CONCRETE

摘要

PROBLEM TO BE SOLVED: To provide a quality control testing method of crack-resistant concrete for readily estimating the presence of additives (agent) mixed into the drying shrinkage crack-resistant concrete which os carried into a concrete-placing site, and the approximate mixing amount.;SOLUTION: In the method, the presence of mixing with expansive material or shrinkage-reducing admixture can be determined, by checking that a circumferential strain amount obtained from a strain gauge attached to the central position height-wise on the lateral surface of a disposable form, such as a thin/thick steel plate mold, namely, a thin cylindrical form used for concrete strength testing, indicates a transition in values for a certain trend. Furthermore, when variations in the strain amount from immediately after concrete placing, until two days of material age reaches 100-300 μ, the concrete can be determined as one having a standard usage amount with expansive material mixed.;COPYRIGHT: (C)2011,JPO&INPIT