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针对云南格巧高速公路双河特大桥C60巨型塔柱大体积高强混凝土在干热河谷地区体积稳定性控制要求,采用L16(44)正交试验,以水胶比、胶凝材料、矿物掺合料取代量、粉煤灰与矿粉复合比例为四因素,研究分析混凝土抗压强度和绝热温升为指标最优设计方案,并通过收缩变形试验优化配合比。结果表明,影响混凝土强度因素逐次为水胶比>胶凝材料>复合掺合料比例>矿物掺合料掺量;影响混凝土绝热温升因素逐次为水胶比>胶凝材料>矿物掺合料掺量>复合掺合料比例;粉煤灰和矿粉均可降低水化放热,并抑制混凝土自收缩和干燥收缩,且粉煤灰收缩抑制效果优于矿粉。
Aiming at the requirement of volume stability of C60 giant tower concrete pylons in Shuanghe super large bridge in Yunnan Qiaoqiao expressway, the L16 (44) orthogonal test was used to control the volume stability of the dry-hot valley. Material substitution, fly ash and slag composite ratio of four factors, the analysis of concrete compressive strength and adiabatic temperature rise as the optimal design options, and through the shrinkage deformation test to optimize the mix. The results show that the factors influencing the strength of concrete are the ratio of water to binder, the ratio of cementitious material to composite admixture, the content of mineral admixture, the influence factors of concrete adiabatic temperature rising successively are water-binder ratio, cementitious material, mineral admixture Dosage> content of composite admixture; Both fly ash and mineral powder can reduce the hydration exotherm, and inhibit self-shrinkage and dry shrinkage of concrete, and fly ash shrinkage inhibition is better than mineral powder.