INFLUENCE OF PHYSICAL PROPERTIES OF CRUSHED SAND WITH ADJUSTED PARTICLE SIZE DISTRIBUTION ON FLUIDITY OF MORTAR

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  • KOIZUMI Shohei
    THE UNIVERSITY OF KITAKYUSHU, Graduate School of Environmental Engineering（1-1, Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka 808-0135, Japan）
  • TAKASU Koji
    THE UNIVERSITY OF KITAKYUSHU, Faculty of Environmental Engineering（1-1, Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka 808-0135, Japan）
  • KOYAMADA Hidehiro
    THE UNIVERSITY OF KITAKYUSHU, Faculty of Environmental Engineering（1-1, Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka 808-0135, Japan）
  • SUYAMA Hiroki
    THE UNIVERSITY OF KITAKYUSHU, Faculty of Environmental Engineering（1-1, Hibikino, Wakamatsu-ku, Kitakyushu-shi, Fukuoka 808-0135, Japan）

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  • 粒度調整した砕砂の物性値がモルタルの流動性に与える影響

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<p>In this study, it was discussed the fluidity of mortar when adjusting the particle size distribution of crushed sand within the range defined by JIS for the purpose of improving the fresh properties when using the whole crushed sand. Using the physical property values of the fine aggregate and the particle shape coefficient as the evaluation index, the particle size distribution and the fluidity of the mortar under different paste properties were verified. As a result, it was difficult to use water absorption, solid volume and particle shape coefficient of fine aggregate as an evaluation index of the fluidity of mortar which changed depending on the particle size distribution of crushed sand, and it became clear that the most suitable one is fineness modulus. In addition, when the fine aggregate volume and the paste volume were constant, the particle size composition had the most influence on the flowability of the mortar, so even when crushed sand was used, it was possible to evaluate and predict the fluidity by finesses modulus. From now on, it is considered to be important for stable utilization of crushed sand, to investigate in middle and high flow areas and to grasp the compressive strength properties. Also, since it was experimented with mortar this time, it is necessary to verify with concrete in the future.</p>

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