STUDY ON THE CHARACTERISTICS OF SHRINKAGE CRACKING OF MORTAR MADE WITH VARIOUS AGGREGATES

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  • JIANG Hanyan
    OITA UNIVERSITY, Graduate Student, Doctor’s Course of Environmental Engineering
  • SATO Yoshiaki
    OITA UNIVERSITY, Department of Architectural Engineering, Faculty of Engineering
  • OTANI Toshihiro
    OITA UNIVERSITY, Department of Architectural Engineering, Faculty of Engineering
  • UEDA Kenji
    ZEROTECHNO Co., Ltd.

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Other Title
  • 各種骨材を用いたモルタルの収縮ひび割れ特性に関する研究

Abstract

In order to reduce the drying shrinkage cracking of concrete, not only reducing the drying shrinkage strain but also reducing the restraint stress becomes important. Thus, Young’s modulus is considered to influence the drying shrinkage cracking of concrete. Therefore, using the mortar specimens with same strength level incorporated with 5 types of aggregate；mixed sand, crushed limestone sand, coral sand, pearlite, and shirasu balloon, which are considered to influence the Young’s modulus of mortar,. simple test for the drying shrinkage cracking by internal reinforcing bar restraint is conducted. As a result, no cracking occurred in the mortar with crushed limestone sand, and the cracking in coral sand mortar occurred late. The pearlite and shirasu balloon with large water absorption and a small density reduced Young’s modulus of the mortar but increased the drying shrinkage strain, thus caused an early cracking, so did the mixed sand. Finally, the stress analysis using the effective Young’s modulus method was performed and the period of the occurrence of cracking was discussed.

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