考虑粗集料充填体积率与级配的混凝土配合比设计方法(公路交通科技应用技术版).docVIP

考虑粗集料充填体积率与级配的混凝土配合比设计方法 赵尚传1，4 杨永顺2 梁奎基3 1 交通部公路科学研究院；2 山东省交通厅公路局； 3山东省公路建设集团有限公司；4道路结构与材料交通行业重点实验室（北京） 摘要：分析了粗集料充填体积率对混凝土拌合物工作性、混凝土强度和耐久性能的影响，提出粗集料的充填体积率在60%-75%之间对混凝土的工作性和开裂性能的控制比较合适；分析了级配对粗集料振实容重和空隙率的影响，试验结果表明最大公称粒径19mm的石灰岩粗集料，振实容重有20kg/m3的差异，空隙率有0.7%的差异；分析了连续级配的粗集料最大粒径对振实容重和空隙率的影响，最大公称粒径19mm和26.5mm之间，振实容重有60-70kg/m3的差异，空隙率有2%-3%的差异；对石灰岩粗集料配制的混凝土密度与粗集料充填体积率的相关性进行了试验研究，相关性好，拟合得到最大公称粒径19mm、26.5mm石灰岩粗集料配制的混凝土密度与粗集料充填体积率之间相关性为0.83-0.98；基于现有混凝土配合比设计理论，提出考虑粗集料充填体积率、级配等特征指标的混凝土配合比计算方法，实例分析表明利用该方法的计算结果与实测情况非常吻合。 关键词：公路工程 设计方法 混凝土性能 粗集料级配 充填体积率 配合比 Mixture Design Method of Concrete Based on Volume Ratio and Gradation of Coarse Aggregate ZHAO-Shangchuan1、4, YANG-Yongshun2, LIANG-Kuiji3 1 Research Institute of Highway, Ministry of Communications, PRC 2 Shandong Highway Administration Bureau, Shandong Province 3 Shandong Highway Engineering Construction Group Co.,Ltd 4 Key Laboratory of Road structures and Materials Ministry of Communications, PRC ABSTRACT: Concrete working performance, strength and durability are tested in different coarse aggregate volume ratio, which shows that it is appropriate for concrete working and cracking performance when coarse aggregate volume ratio is controlled between 60 percent and 75 percent. Influence on tap density and void ratio is analyzed for coarse aggregate gradation, which shows that there exist 20 kg/m3 difference in tap density and 0.7 percent difference in void ratio for lime coarse aggregate whose maximum particle size is 19 mm. Influence on tap density and void ratio is analyzed also for coarse aggregate maximum particle size, which shows that there exist 60-70 kg/m3 variance in tap density and 2%-3% variance between 19 mm and 26.5mm. Tests are carried out to gain the correlation between concrete density and coarse aggregate volume ratio for lime rock, which shows that coefficients of correlation is in 0.83-0.98 when coarse aggregate maximum particle size is 19mm and 26.5mm. Mixture Design Method of Concrete is put forth base