成达万高铁资阳沱江大桥C60高抗裂主塔 混凝土的研究  

Study on the C60 high crack resistance main tower concrete of Ziyang Tuojiang Bridge of Chengdu-Dazhou-Wanzhou high-speed railway

作　　者：罗德立 LUO Deli(Cheng Lan Railway Co.,Ltd.,Chengdu 610037,China)

机构地区：[1]成兰铁路有限责任公司,四川成都610037

出　　处：《混凝土与水泥制品》2024年第5期90-93,共4页China Concrete and Cement Products

摘　　要：为了解决成达万高铁资阳沱江大桥C60主塔混凝土高空养护作业难、开裂风险高等问题,通过单掺降黏剂、复掺降黏剂和抗裂剂对C60主塔混凝土的配合比进行了优化设计。结果表明:与基准组相比,单掺降黏剂、复掺降黏剂和抗裂剂均可改善混凝土的孔结构,降低孔隙率、干燥收缩和绝热温升,提高混凝土的抗裂性;与单掺降黏剂相比,复掺降黏剂和抗裂剂对混凝土的抗压强度略有不利,但仍满足设计要求,且对温度裂缝的抑制效果略差。In order to solve the problems of difficult high-altitude curing operation and high cracking risk of C60 main tower concrete of Ziyang Tuojiang Bridge of Chengdu-Dazhou-Wanzhou high-speed railway,the mix proportions of C60 main tower concrete was optimized by adding single viscosity reducer,compound viscosity reducer and anti-cracking agent.The results show that compared with the benchmark group,single addition of viscosity reducer,and compound addition of viscosity reducer and anti-cracking agent can improve the pore structure of concrete,reduce porosity,drying shrinkage and adiabatic temperature rise,and improve the crack resistance of concrete.Compared with single addition of viscosity reducer,compound addition of viscosity reducer and anti-cracking agent has a slightly unfavorable effect on the compressive strength of concrete,but still meets the design requirements and has a slightly poorer inhibition effect on the temperature cracks.

关 键 词：大体积混凝土 降黏剂 抗裂剂 抗压强度 孔结构 干燥收缩 绝热温升 

分 类 号：TU528.53[建筑科学—建筑技术科学]