中国碾压混凝土拱坝材料特性研究

Studies on materials of RCC dam in China

通过对碾压混凝土原材料、配合比、技术性能三方面的研究结果表明,中国拱坝碾压混凝土具有水泥用量少、粉煤灰掺量高、胶凝材料用量适中、绝热温升低、抗裂性好等特性;对比沙牌拱坝碾压混凝土,高抗裂碾压混凝土强度提高、弹性模量下降、弹强比减小、极限拉伸值提高,表现出极好的抗裂性能。

According to studies on raw material, mix proportion and technical performance of RCC, it is found that the concrete used in China has the features of using less cement, more fly ash and moderate cementitious materials, low in adiabatic temperature rise and high in crack resistance. Comparing with RCC of Sha brand, high crack resistance RCC concrete shows excellent anti-crack performance, with higher strength, 5% lower in elastic modulus and ultimate pulling increase by 27%.