原材料品种对水工碾压混凝土性能的影响  

Influence of Raw Materials on Performance of Hydraulic Roller Compacted Concrete

作　　者：郭文康[1] 张晓波 王述银[1] 桂威 GUO Wen-kang;ZHANG Xiao-bo;WANG Shu-yin;GUI Wei(Engineering Quality Inspection Center,Yangtze River Scientific Research Institute,Wuhan 430010,China;Department of Project Resettlement Planning, Changjiang Institute of Survey, Planning,Design and Research Co., Ltd., Wuhan 430010, China)

机构地区：[1]长江科学院工程质量检测中心,武汉430010 [2]长江勘测规划设计研究有限责任公司,工程移民规划研究院,武汉430010

出　　处：《长江科学院院报》2020年第7期147-152,共6页Journal of Changjiang River Scientific Research Institute

摘　　要：为解决某大型水电站工程大坝碾压混凝土当地原材料品种的科学合理应用问题,选择当地原材料(普通硅酸盐水泥、花岗岩人工骨料、F类Ⅱ级粉煤灰)开展了碾压混凝土性能试验,并根据水泥、骨料和粉煤灰等材料品种,比较其与龙滩水电站工程碾压混凝土的拌和物性能、物理力学性能、变形性能、耐久性、热力学性能等方面的差异,探讨了主要原材料品种差异对碾压混凝土性能的影响及作用机理。结果表明:采用当地原材料可配制出满足设计技术要求的碾压混凝土;碾压混凝土的拌和物性能主要受水泥标准稠度用水量、骨料颗粒级配及吸水率等因素的影响;物理力学性能、变形性能和耐久性则由水泥品种、粉煤灰品种及掺量、粉煤灰中CaO和烧失量含量、骨料强度等综合因素控制;碾压混凝土的绝热温升值主要取决于水泥品种、水化热及水泥用量,水泥水化热值越低,水泥用量越少,则碾压混凝土绝热温升值越低。基于试验研究成果,提出了大坝碾压混凝土应合理选用当地材料的建议。To scientifically utilize local raw materials for the roller compacted concrete(RCC)of a large hydropower dam project,we conducted performance test on RCC prepared with local raw materials(ordinary Portland cement,artificial granite aggregate,and grade II fly ash),and compared the mixture properties,physical and mechanical performances,deformation,durability,and adiabatic temperature rise between the RCCs of the present project and Longtan hydropower project.On such basis,we further investigated the influences of raw materials on RCC performance.Results unveil that local raw materials can be used to prepare RCC that meets the requirements of design specification.The mixture property of RCC is mainly affected by water consumption for normal consistency of cement,particle gradation and water absorption of aggregate.The physical and mechanical properties,deformation,and durability of RCC are controlled by comprehensive factors inclusive of cement type,fly ash type and dosage,CaO content and loss on ignition in fly ash,as well as aggregate strength.The adiabatic temperature rise of RCC mainly depends on the type of cement,hydration heat,and cement consumption.The lower the heat value of cement hydration and the less the amount of cement consumption,the smaller the adiabatic temperature rise of RCC.According to the research results,we put forward suggestions for the rational selection of local materials for RCC dam.

关 键 词：碾压混凝土 水泥 骨料 粉煤灰 原材料 性能 

分 类 号：TV431[水利工程—水工结构工程]