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在紧水滩上游拱围堰上,首次采用低热微膨胀水泥混凝土进行81m浇筑块不分缝一次滑模到顶的快速施工试验。试验结果说明,低热微膨胀水泥混凝土的力学变形性能符合设计要求。混凝土平均强度R_(28)=28.15MPa,离差系数为8.3%,保证率为99.99%,混凝土自生体变形28天平均值为268×10~(-6),比堰体埋设仪器实际变形的平均值201×10~(-6)稍大。低热微膨胀水泥混凝土的膨胀性能具有对试验堰段补偿收缩的作用,从观测数据分析,堰体内混凝土早期膨胀性
On the upstream cofferdam of Jinshuitan, the first time the low-thermal micro-expansive cement concrete was used to carry out the rapid construction test of sliding block top-to-top with 81m pouring blocks. The test results show that the mechanical deformation properties of low thermal expansion cement concrete meet the design requirements. The average concrete strength R 28 was 28.15 MPa, the coefficient of variation was 8.3% and the guarantee rate was 99.99%. The mean value of self-deformation of concrete during 28 days was 268 × 10 -6, which was lower than that of the actual deformation Average 201 × 10 ~ (-6) slightly larger. The expansion behavior of the low-thermal micro-expansive cement concrete has the effect of compensating and shrinking the experimental weir section. From the observation data, the early expansibility of the concrete in the weir