关键词: 尾矿骨料, 混凝土, 温控措施, 温度应力, 有限单元法

Abstract: Concrete laboratory test results have indicated that the concrete performance with tailings aggregate of Panzihua steel plant can meet all the requirements of Jinsha Hydropower Station. While using tailings aggregate makes the concrete cementing material content increase by 10~20 kg/m3, and therefore the concrete adiabatic temperature increases by 1～2℃. According to the temperature sensitivity analysis aiming at different construction schemes, a temperature control and crack prevention scheme for tailing aggregate concrete of the gravity dam was proposed. The 3D finite element method was used to simulate the transient temperature and the thermal stress field. The result showed that by using recommended temperature control measures, the maximum temperature in entire region of the gravity dam could meet the design standards, and the concrete crack resistance safety coefficient could reach more than 1.8. The research proved the feasibility of using steel factory tailings as concrete aggregate for dam construction and temperature control, which has tremendous benefits of economics and environment.

Key words: tailings aggregate, concrete, temperature control measures, thermal stress, finite element method