粗水泥改善碾压混凝土抗裂性试验研究  

Experimental Research on Coarse Cement Improving Crack-resistance of RCC

作　　者：龚英[1,2] 高江林[1,2] 丁晶晶[1] 

机构地区：[1]江西省水利科学研究院,江西南昌330029 [2]江西省水工安全工程技术研究中心,江西南昌330029

出　　处：《水电能源科学》2015年第7期135-138,191,共5页Water Resources and Power

基　　金：国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(50539040);水利部公益性行业科研专项经费项目(200701014)

摘　　要：为改善碾压混凝土(RCC)的抗裂性,结合西部某工程RCC重力坝抗裂问题,从材料角度探讨粗水泥改善RCC抗裂性的可行性。采用同种水泥熟料分别磨制4种细度的PⅠ42.5水泥,按照C18015三级配RCC设计要求,配制4组RCC,研究水泥细度对RCC力学性能、变形性能、热学性能的影响,并采用抗裂指标K研究水泥细度对RCC综合抗裂能力的影响。结果表明,粗水泥配制的RCC性能可达设计指标要求,且与细水泥的发展水平相当;粗水泥可改善RCC抗裂性(尤其是早期);水泥细度与抗裂指标K呈负线性相关,即在满足RCC设计性能要求前提下,水泥越粗,其RCC综合抗裂能力越强;采用粗水泥配制低热高抗裂RCC是一项技术经济良好的有效措施。In a western engineering, the problem how to improve crack-resistance of RCC gravity dam should be solved. From the standpoint of material, the paper explored the feasibility of improving crack-resistance of RCC with the coarse cement. The 4 kinds of fineness P I 42. 5 cement were grounded by the same clinker and gypsum. And then 4 groups of RCC were made based on three-gradation RCC design demand of C180 15. The influence of cement fineness on the mechanical property, deformation performance and thermal property of RCC was studied. Finally, the crack-resist- ance index （K） was used to research the impact of cement fineness on the general crack-resistance of RCC. The results show that the RCC made with coarse cement could satisfy the design demand and reach the level of fine cement; crack-re- sistance of RCC could be improved by coarse cement especially on the early age; crack-resistance index （K） was linearly decreased with the increase of cement fineness. Under the design requirement of RCC, the coarser the cement was, the stronger the general crack-resistance of RCC was. The technology of using coarse cement was an effective and economical measure to make up low heat crack-resistance of RCC.

关 键 词：粗水泥 碾压混凝土 抗裂性 力学性能 变形性能 热学性能 

分 类 号：TV41[水利工程—水工结构工程]