辉长岩骨料全级配碾压混凝土力学特性研究  

Mechanical properties of full-graded roller compacted concrete of gabbro aggregate

作　　者：刘尚坤 何金龙 刘紫玫 戈雪良[3] LIU Shangkun;HE Jinlong;LIU Zimei;GE Xueliang(PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,China;Huaneng Lancang River Hydropower,Kunming 650209,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210029,China)

机构地区：[1]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [2]华能澜沧江水电股份有限公司,云南昆明650209 [3]南京水利科学研究院,江苏南京210029 [4]河海大学水利水电学院,江苏南京210029

出　　处：《人民长江》2024年第3期190-198,共9页Yangtze River

基　　金：中国华能集团科技项目“TB水电站施工图阶段第一批重大科研项目”(HNKJ 22-H87)。

摘　　要：辉长岩坚硬致密,具有高强度、高弹模特性,但将辉长岩骨料应用于大型水电工程在国内外尚无先例,缺乏可借鉴的工程实践经验,且湿筛碾压混凝土试件的力学性能无法真实反映全级配碾压混凝土的力学特性。对辉长岩骨料最大粒径为80 mm的全级配碾压混凝土的力学特性演化规律开展了系统研究,包括抗压强度、劈拉强度、轴压性能、轴拉性能、抗剪性能等,对比分析了全级配碾压混凝土抗压、劈拉强度及其湿筛试件的尺寸效应,并将试验结果与国内典型工程所用碾压混凝土的力学性能发展规律进行对比分析,此外还建立了辉长岩骨料全级配碾压混凝土抗压强度、劈拉强度、轴压性能、轴拉性能等力学性能-养护龄期演化函数模型。结果表明:辉长岩骨料全级配碾压混凝土的抗压强度、劈拉强度、抗剪等力学性能随龄期的发展规律符合国内同类工程碾压混凝土力学性能发展的一般规律;C_(90)20W8F100辉长岩全级配碾压混凝土试件与其湿筛试件抗压强度平均尺寸效应系数为0.80、劈拉强度平均尺寸效应系数为0.66;相关力学性能演化模型相关性高(R^(2)=0.9643~0.9992)。可见辉长岩骨料用于大型水电工程碾压混凝土坝建设具有可行性。Gabbro is hard and dense,with high strength and high elastic modulus.However,there is no precedent for the application of gabbro aggregate in large hydropower projects at home and abroad,and there is a lack of engineering practice experience for reference.The mechanical properties of wet-screened roller compacted concrete specimens cannot truly reflect the mechanical properties of fully-graded roller compacted concrete.Therefore,the evolution law of mechanical properties of fully-graded roller compacted concrete prepared with gabbro aggregate with the maximum particle size of 80 mm was systematically studied,including compressive strength,splitting tensile strength,axial compressive strength and elastic modulus,axial tensile strength and elastic modulus,shear performance,etc.The compressive strength,splitting tensile strength and size effect of wet-screened specimens of fully graded roller compacted concrete were compared and analyzed,and the test results were compared with the development law of mechanical properties of roller compacted concrete in typical domestic projects.In addition,the mechanical properties-curing age evolution function model of compressive strength,splitting tensile strength,axial compression performance and axial tensile performance of full-graded RCC with gabbro aggregate was established.The results show that the development law of compressive strength,splitting tensile strength,shear strength and other mechanical properties of full-graded RCC of gabbro aggregate with age is in line with the general law of mechanical properties development of RCC in similar projects in China.The average size effect coefficient of the compressive strength of C_(90)20W8F100 gabbro full-graded roller compacted concrete specimen and its wet-screened specimen is 0.80,and the average size effect coefficient of the splitting tensile strength is 0.66.The correlation of the mechanical properties models are high(R^(2)=0.9643~0.9992).It is feasible to use gabbro aggregate for the construction of roller compacted con

关 键 词：辉长岩骨料 碾压混凝土 全级配试件 湿筛试件 尺寸效应 力学性能 

分 类 号：TV43[水利工程—水工结构工程]