METHOD FOR DETERMINING BLENDING RATIO OF EXPANSIVE ADMIXTURE FOR CONCRETE

摘要

PROBLEM TO BE SOLVED: To provide a method for determining the blending ratio of an expansive admixture for concrete by which an adequate blending ratio of the expansive admixture corresponding to the conditions or the like required to a concrete structure to be constructed can be obtained and the occurrence of cracks in concrete being placed can be prevented. SOLUTION: A plurality of concrete samples S for estimation, prepared by changing at least blending ratio of an expansive admixture in the blending of concrete used at a construction site are solidified under the same temperature condition as that of the construction site in a state where the deformation in the longitudinal direction of each sample is restricted by a restricting steel pipe 2 of a strain measuring device 1. Then, the strain in the longitudinal direction generated in the restricting steed pipe 2 in the solidification process is measured with a strain indicator 4 as the strain of each concrete sample S. The blending ratio of the expansive admixture is determined based on the generated stress of each concrete sample S, calculated from the measured data with a strain measuring instrument 6. COPYRIGHT: (C)2009,JPO&INPIT