粗骨料种类对高强混凝土工作性和力学性能的影响  

Impact of Coarse Aggregate Types on Workability and Mechanical Properties of High Strength Concrete

作　　者：詹伟[1] 杨林[1] 苗苗[2] 

机构地区：[1]四川公路桥梁建设集团有限公司,四川成都610041 [2]重庆大学材料科学与工程学院,重庆400045

出　　处：《重庆建筑》2017年第12期52-55,共4页Chongqing Architecture

摘　　要：该文选用同级配的石灰石碎石、卵碎石和玄武岩碎石3种粗骨料,研究粗骨料种类对高强混凝土工作性和力学性能的影响。通过对高强混凝土的塌落度、扩展度、抗压强度、弹性模量等指标的测试和分析,结果表明:玄武岩组新拌混凝土的工作性稍逊于石灰石组和卵碎石组,卵碎石组最好。对于石灰石组和玄武岩组,由于骨料表面吸水导致玄武岩组早期混凝土强度较石灰石组偏低,而后期因为玄武岩强度高而使得其配制的混凝土28d强度提高。卵碎石粒形在强度上的劣势导致其28d强度最低。三种粗骨料中,骨料弹性模量越高,同等条件下配制的混凝土弹性模量也越大,但混凝土弹性模量要远小于骨料弹性模量值,且混凝土弹性模量的增幅远远小于相应粗骨料的增幅。In this paper,the three types of graded coarse aggregates--limestone gravel, pebble gravel and basalt gravel are selected to study the impact of coarse aggregate types on the workability and mechanical properties of high strength concrete. Based on the test and analysis of the slump degree, extension degree, compressive strength, elasticity modulus, etc., the results show that the workability of fresh concrete with basalt gravels is worse than that with gravels and that with pebble gravels, and the workability of concrete with pebble gravels is the best. For the limestone gravel group and the basalt gravel group, the concrete strength of the basalt gravel group is lower than that of the limestone gravel group in the early stage due to water absorption of the aggregate surface, and the 28 d concrete strength is improved for the high strength of basalt. The disadvantage of the pebble gravel in shape causes its 28 d strength to be the lowest. Among the three types of coarse aggregates,the higher the elasticity modulus of the aggregate, the greater the elasticity modulus of the concrete prepared under the same condition, but the elasticity modulus of the concrete is much smaller than that of the aggregate, and the growth rate of the elasticity modulus of the concrete is far smaller than that of the corresponding coarse aggregate.

关 键 词：粗骨料 高强混凝土 力学性能 弹性模量 玄武岩组新拌混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]