A New Model for the Behaviour of Roller Compacted Concrete in Dams under Early Thermal Loading
The management of hydration heat has always been a significant issue in the engineering of large concrete dams. While a lower cementitious materials content in the case of Roller Compacted Concrete has resulted in reduced total heat development, the rapidity of the construction method implies that more of the heat generated is trapped within the body of the dam structure. In the case of the large dams now commonly being constructed in RCC, without artificial cooling, the hydration heat can require a period of several decades to be fully dissipated. When giving consideration to the design impacts of hydration heat development and dissipation in large gravity dams and arch dams, it is particularly important to understand the related behaviour of RCC as a material. While RCC has to date generally been treated as conventional mass concrete in respect of the effects of early thermal loading, instrumentation evidence from the Wolwedans and Knellpoort Dams in South Africa and Cine Dam in Turkey has demonstrated that RCC actually behaves quite differently. To develop realistic designs for large RCC gravity dams and for RCC arch dams, a meaningful understanding of the implications of the apparent early behaviour of RCC must accordingly be developed. In this paper, the authors compare the measured behaviour of Wolwedans Dam with a range of predictions through thermal- structural Finite Element analysis, applying a range of materials models. The implications of the behaviour characteristics and models proposed on the design and analysis of large RCC gravity dams and particularly arch dams are also discussed.
RCC thermal behaviour arch dams modeling
Quentin H. W. Shaw Robert P. Greyling
6 Daventry Street, Lynnwood Manor, 0081, South Africa
国际会议
第五届碾压混凝土坝国际研讨会(The Fifth International Symposium on Roller Compacted Concrete(RCC))
贵阳
英文
61-68
2007-11-02（万方平台首次上网日期，不代表论文的发表时间）