SELECTION METHOD OF COARSE AGGREGATE FOR HIGH-STRENGTH CONCRETE

摘要

PROBLEM TO BE SOLVED: To provide a method for selecting easily and accurately a coarse aggregate suitable especially for compressive strength of high-strength concrete corresponding thereto, by searching earnestly for a character which has strong correlation with a modulus of static elasticity and is measurable from an aggregate sample itself without using the modulus, so that the character can be used as an alternative index.;SOLUTION: In a determination method of the modulus of static elasticity of a coarse aggregate for high-strength concrete, the modulus of static elasticity is measured from a sample cut out beforehand from a coarse aggregate ore, and the coarse aggregate ore is crushed to obtain the coarse aggregate, and a total pore volume in the range of a pore size whose lower limit value by a porosimeter of the coarse aggregate is set at 0.003-0.004 μm and whose upper limit value is set at 0.2-30 μm is measured. A correlation expression between the measured value and the measured value of the modulus of static elasticity is generated, and the total pore volume of the selection object coarse aggregate is measured in the range of the pore size, and the value of the modulus of static elasticity is determined from the correlation expression by using the correlation expression.;COPYRIGHT: (C)2010,JPO&INPIT