JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2018, Vol. 35 ›› Issue (12): 133-137.DOI: 10.11988/ckyyb.20180044

• HYDRAULIC STRUCTURE AND MATERIAL • Previous Articles     Next Articles

Comparison of Thermal and Mechanical Properties Between Low-heat and Medium-heat Portland Cement Concrete

FAN Qi-xiang1, YANG Hua-quan2, LI Wen-wei1, WANG Zhi-lin1, CHEN Xia2   

  1. 1.China Three Gorges Corporation, Beijing 100038, China;
    2.Structural Material Research Department, Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2018-01-13 Online:2018-12-01 Published:2018-12-18

Abstract: The thermal and mechanical properties of low-heat cement and medium-heat cement are compared with the concrete of Baihetan dam as a research object. The compared thermal and mechanical properties include compressive strength, drying shrinkage, autogenous volumetric deformation, and adiabatic thermal rise. Results indicate that given the same water-binder ratio and fly ash content, low-heat cement concrete possesses lower strength, ultimate tension and Young’s elastic modulus at 7 d and 28 d than medium-heat cement concrete does; with the extension of testing age, strength of low-heat cement concrete grows, approaching the strength of medium-heat cement concrete; while at the 180 d age, the strength and ultimate tension of low-heat cement concrete are larger than those of medium-heat cement concrete. No big difference was observed in terms of drying shrinkage, and both concretes exhibited micro-expansion in autogenous volume deformation. The insulated thermal rise of low-heated cement concrete at 28 d age is lower than that of medium-heat cement concrete by 2.0℃-3.5℃. Overall, low-heated cement concrete was rated better than medium-heated cement concrete in terms of crack resistance.

Key words: low-heat cement, medium-heat cement, concrete, thermal property, crack resistance

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