Abstract：
Factors influencing early age cracks on massive concrete of routine island foundation of a nuclear power station are tested and researched through adjustment of ingredients of cementing material, hydration heat measurement and analysis, aggregate gradation optimization and free shrinkage test of concrete. The test results show that optimization of ingredients of cementing material could reduce hydration heat and slow down cementing material hydration; the optimized mix proportion of cementing material could not only guarantee the pressure strength of concrete, but also satisfy the requirements of high-slump pumped concrete after polypropylene fiber is added; the fiber added could effectively reduce the free shrinkage of concrete and improve concrete performance against shrinkage. At last, adiabatic temperature rise test of massive concrete is carried out and test results show that the optimized proportion could reduce the peak temperature of concrete hydration temperature rise, and then reduce the temperature stress of massive concrete during hydration reaction and the probability of crack generation caused by temperature variation; meanwhile, the fiber added could obviously reduce visible early age shrinkage cracks.
GAO Hui-xiao,NING Xi-liang,DING Yi-ning. FACTORS INFLUENCING EARLY AGE CRACKS ON MASSIVE CONCRETE OF NUCLEAR POWER STATION[J]. Architecture Technology, 2013, 44(5): 394-398.
