姚江水利枢纽工程掺纤维水工混凝土性能试验研究  

Experimental study on performance of hydraulic concrete blended with fiber in Yaojiang water conservancy project

作　　者：李栖鹏 韩燕华[2] 石妍[3] 彭尚仕[3] LI Qipeng;HAN Yanhua;SHI Yan;PENG Shangshi(Gansu province Water Engineering Association,Lanzhou 730000,China;Hubei Engineering University,Xiaogan 432000,China;Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]甘肃省水利水电工程局有限责任公司,甘肃兰州730000 [2]湖北工程学院,湖北孝感432000 [3]长江水利委员会长江科学院,湖北武汉430010

出　　处：《混凝土》2022年第10期71-74,共4页Concrete

基　　金：国家自然科学基金资助项目(U2040222,52179122);中央级公益性科研院所基本科研业务费项目(CKSF2019374/CL)。

摘　　要：为给姚江防涝排涝调控水利枢纽工程的设计与施工提供必要的技术依据,对该工程所用掺纤维水工混凝土展开了力学性能、绝热温升及抗裂试验。试验结果表明:其他条件一定、掺入纤维时,混凝土的引气剂用量比未掺纤维时高约0.002%;掺纤维的C20与C35混凝土的7 d抗压强度低于未掺纤维时的强度值,但28 d时的抗压强度比未掺纤维时高约1.0 MPa;掺纤维混凝土的28 d极限拉伸值均高于未掺纤维时,且增长幅度比抗压强度的增长幅度大。掺入纤维后,混凝土绝热温升均有降低,混凝土表面仅出现非常细的裂纹,但混凝土自生体积变形较大,且随龄期有较大幅度地缩减。因此,建议工程中适量掺入纤维,以提高混凝土力学性能,降低绝热温升,提高抗裂性能。In order to provide the necessary technical basis for the design and construction of Yaojiang hydraulic project,the mechanical properties,adiabatic temperature rise and crack resistance tests of the fibrous blended concrete used in the project were carried out.The test results show that the amount of air entraining agent is about 0.002%higher than that without fiber when other conditions are constant and fiber is added.The compressive strength of C20 and C35 concrete specimen with fiber is lower than that without fiber at 7 d,but the compressive strength of 28 d is about 1.0 MPa higher than that without fiber.The 28 d ultimate tensile values of concrete with fiber are higher than those without fiber,and the increase range is larger than that of compressive strength.The adiabatic temperature rise of concrete decreases with the addition of fiber,and only very fine cracks appear on the surface of concrete.However,the autogenous volume deformation of concrete is large and decreases greatly with age.Therefore,it is suggested that proper amount of fiber should be added in engineering to improve mechanical properties of concrete,reduce adiabatic temperature rise and improve crack resistance.

关 键 词：水工混凝土 聚丙烯纤维 力学性能 绝热温升 抗裂性能 水利枢纽工程 

分 类 号：TU528.041[建筑科学—建筑技术科学]