粗骨料最大粒径对预拌混凝土性能的影响  

Effect of Maximum Size of Coarse Aggregates on the Properties of Ready-Mixed Concrete

作　　者：卢超琦 宋少民 LU Chao-qi;SONG Shao-ming(Beijing Key Laboratory of Advanced Functional Materials for Building and Environment,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学,建筑结构与环境修复功能材料北京市重点实验室,北京100044

出　　处：《工程建设与设计》2025年第1期198-200,共3页Construction & Design for Engineering

基　　金：机制骨料预拌混凝土应用技术产学研合作(00362020218)。

摘　　要：通过制备4种不同粗骨料最大粒径混凝土,探究粗骨料最大粒径对C70预拌混凝土性能和微观结构的影响,结果表明,粗骨料最大粒径增大,预拌混凝土拌和物流动性变好,黏聚性变差;C70预拌混凝土各龄期抗压强度随着最大粒径增大,先增大后降低;当粗骨料最大粒径由25mm增大31.5 mm时,混凝土微观结构孔隙率增大,有害孔、多害孔显著增多。综合上述影响规律,明确配制C70大流态预拌混凝土宜选择最大粒径为25mm的粗骨料。Through the preparation of concrete with the maximum particle size of four different coarse aggregate,the influence of the maximum particle size of coarse aggregate on the performance and microstructure of C70 ready-mixed concrete is explored.The results show that the maximum particle size of coarse aggregate increases,the fluidity of premixed concrete mixture improves and the compressive strength of C70 premixed concrete increases with the maximum particle size;when the maximum particle size of coarse aggregate increases by 25 mm 31.5 mm,the porosity of concrete microstructure increases,and the harmful holes and harmful holes increase significantly.Based on the above influence rules,it is clear that the coarse aggregate with a maximum particle size of 25 mm should be selected for preparing C70 large liquid ready-mixed concrete.

关 键 词：粗骨料最大粒径 预拌混凝土 混凝土性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]