摘要
观音岩水电站大坝碾压混凝土主要是在丽江中热水泥中掺麻地湾磨细灰渣,对C_(180)15W_(90)6F_(90)100三级配碾压混凝土和C_(180)20W_(90)8F_(90)100二、三级配碾压混凝土进行配合比设计及其性能试验研究,对比分析90 d和180 d两种设计龄期混凝土的强度、热学、变形和耐久性等性能。在保证设计性能(强度、抗渗等级及抗冻等级)要求的基础上使碾压混凝土成本大大降低。由于加大了灰渣的掺量,碾压混凝土的绝热温升极大降低,由此引发的温度应力将得到有效控制;混凝土早期弹性模量、干缩、自生体积变形均较低,后期的强度和极限拉伸值等较高,碾压混凝土的抗裂性能和整体服役性能得到提高。
The roller compacted concrete of Guanyinyan Hydropower Station is mainly consisted of moderate heat cement produced in Lijiang mixed with Madiwan slag. The mix proportions of C_（180）15W_（90）6F_（90）100 third-graded roller compacted concrete and C_（180）20W_（90）8F_（90）100 second and third graded roller compacted concrete are designed respectively and the properties of them are then tested. The strength, heat, deformation and durability of concrete with design age of 90 d and 180 d are compared. The cost of roller compacted concrete is greatly reduced under the premise of ensuring concrete design properties （ strength, impermeability grade and frost resistance level）. Due to the increase of Madiwan slag content, the adiabatic temperature rise of RCC is greatly reduced, and so the temperature stress will be effectively controlled. The early elastic modulus, shrinkage and autogenous deformation of concrete are low, and the later strength and ultimate tensile strain are high. The cracking resistance and overall service performance of RCC are improved.
作者
刘数华
周伟
常晓林
LIU Shuhua ZHOU Wei CHANG Xiaolin(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, Hubei, Chin)
出处
《水力发电》
北大核心
2017年第1期48-54,58,共8页
Water Power
关键词
碾压混凝土
麻地湾灰渣
配合比设计
性能
试验
观音岩水电站
roller compacted concrete
Madiwan slag
mix proportion design
property
experiment
Guanyinyan Hydropower Station
