摘要
为研究外掺一定量的MgO,能否使碾压混凝土产生微膨胀,并利用其膨胀来补偿碾压混凝土在温降时产生的收缩,防止或减少碾压混凝土由于温降产生的裂缝。使用一种新型MgO材料,从施工现场取样进行了碾压混凝土的全级配自生体积变形试验。试验结果证明:掺MgO的碾压混凝土在标准养护条件下365 d龄期的最大膨胀量为114×10-6,高温养护条件下365 d龄期的最大膨胀量为168×10-6;其膨胀量满足设计的要求。二级配碾压混凝土的膨胀量稍大于三级配碾压混凝土的膨胀量。
Due to addition of a new type MgO material, RCC shows a stable expansion to compensate the shrinkage resulted from intemal or extemal temperature gradient, thus minimizing the risk of cracking. Autogenous volume deformation of full-sized RCC is tested, the experimental results show that the maximum expansion ratio is 114×10-6 and 168×10-6 at the age of 365 days under standard temperature or high temperature curing conditions, respectively. Expansion ratio of wet-screened RCC is a little more than that of full-sized RCC.
出处
《长江科学院院报》
CSCD
北大核心
2006年第3期43-46,共4页
Journal of Changjiang River Scientific Research Institute
