粉煤灰和磨细矿渣对北京地铁5号线清河斜拉桥大体积混凝土性能的影响

本文研究了粉煤灰和磨细矿渣对大体积承台混凝土抗压强度、水化热、收缩率的影响。试验结果表明：在水泥掺量一定时，随矿渣粉掺量的增加水化放热量、最大放热速率和干缩率均增大；水泥用量为200kg／m^3、粉煤灰为140kg／m^3、矿渣粉为50kg／m^3时，混凝土水化热较小、干缩率较小；SEM形貌图表明，粉煤灰和磨细矿渣的综合效应，使火山灰反应更加充分，Ca(OH)2含量降低，在水泥用量200kg／m^3时，混凝土28天结构致密。

Effects of fly ash and grinding slag to mass volume concrete performance of Beijing subway No.5 Qinghe cable-stayed bridge

It researched the influence of fly ash and grinding slag to compressive strength,heat of hydration and shrinkage rate of mass volume concrete.The results shows that when the cement is fixed,the inerease of slage keep the hydrothermal dissipation amount,speed and shrinkage will increase at the same time;While cement is 200kg/m~3,fly ash is 140kg/m~3,slag powder is 50kg/m~3,heat of hydration and shrinkage is lower,From the SEM, synthetic effects of fly ash and grinding slag can improve the reaction of lava ash,and decrease the Ca(OH)_2;While cement is 200kg/m~3,concrete structure is fixed in the 28~(th) day.