摘要
依托引江济淮工程,研究了5~31.5 mm和5~40 mm两种粗骨料粒径对混凝土工作性能、力学性能和变形性能的影响。结果显示:采用5~31.5 mm粗骨料粒径的混凝土用水量比采用5~40 mm粗骨料粒径制备的混凝土高3~4 kg/m^(3),但混凝土拌合物性能整体上无明显差异;与5~40 mm骨料制备混凝土相比,采用5~31.5 mm骨料制备C25和C30混凝土90 d龄期的抗压强度分别提高了1.8 MPa和1.1 MPa,劈拉强度分别提高了0.17 MPa和0.28 MPa,极限拉伸值分别提高了6×10^(-6)和5×10^(-6),混凝土的弹性模量差异较小;与5~40 mm骨料制备混凝土相比,采用5~31.5 mm骨料制备C25和C30混凝土90 d龄期的干缩分别增大22×10^(-6)和15×10^(-6),360 d龄期的自生体积变形增大3×10^(-6)和4×10^(-6)。结果表明:采用5~31.5 mm粗骨料粒径的混凝土用水量和胶材用量略有增大,致使混凝土的力学性能和变形性能增大,能够满足粗骨料粒径为5~40 mm的水工混凝土力学性能要求,有效解决了水利工程建设中粗骨料获取来源不足的现实问题,但应关注变形性能增大可能导致混凝土开裂的问题。
Based on the Yangtze-to-Huaihe Water Diversion Project,the effects of two coarse aggregate sizes,5~31.5 mm and 5~40 mm,on the workability,mechanical properties and deformation properties of concrete were investigated.The result showed that the water consumption of concrete with 5~31.5 mm coarse aggregate size increased by 3~4 kg/m^(3)than that of 5~40 mm concrete,and there was no significant difference in the mix properties.Compared with the concrete prepared with 5~40 mm aggregate,the compressive strength of C25 and C30 concrete at 90 d age prepared with 5~31.5 mm aggregate increased by 1.8 MPa and 1.1 MPa,the split tensile strength increased by 0.17 MPa and 0.28 MPa,the ultimate tensile value increased by 6×10^(-6)and 5×10^(-6),respectively,and the difference in the modulus of elasticity of the concrete was smaller.In addition,the drying shrinkage of C25 and C30 concrete prepared with 5~31.5 mm aggregates increased by 22×10^(-6)and 15×10^(-6)at the age of 90 d,respectively,and the autogenous volumetric deformation increased by 3×10^(-6)and 4×10^(-6)at the age of 360 d.The result show that the water consumption and cementitious material dosage of concrete with 5~31.5 mm coarse aggregate size slightly increase,resulting in an increase in the mechanical properties and deformation properties of concrete,which can meet with the mechanical properties of hydraulic concrete with a coarse aggregate size of 5~40 mm,and effectively solve the problem of insufficient access to sources of coarse aggregate for the construction of water conservancy projects.However,we should pay attention to the problem that the increase of deformation properties may lead to concrete cracking.
作者
高怀振
夏求林
李明霞
李盼盼
蒋文广
王世美
刘恒
GAO Huaizhen;XIA Qiulin;LI Mingxia;LI Panpan;JIANG Wenguang;WANG Shimei;LIU Heng(Anhui Provincial Group Limited for Yangtze-to-Huaihe Water Diversion,Hefei 23088,Anhui,China;Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan 430010,Hubei,China)
出处
《水利水电技术（中英文）》
北大核心
2024年第S01期476-481,共6页
Water Resources and Hydropower Engineering
基金
长江科学院中央级公益性科研院所基金(CKSF2019507/CL)
长江科学院中央级公益性科研院所基金(CKSF2023304/CL)
安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20210408381)
关键词
粗骨料粒径
工作性能
力学性能
变形性能
coarse aggregate particle size
workability
mechanical properties
deformation properties
