C120超高泵送机制砂自密实混凝土研制  

RESEARCH ON C120 ULTRA-HIGH PUMPING MACHINE-MADE SAND SELF-COMPACTING CONCRETE

作　　者：王贵禄 陈尚伟 何信周 陈燕菲 严龙顺 WANG Gui-lu;CHEN Shang-wei;HE Xin-zhou;CHEN Yan-fei;YAN Long-shun(Department of Civil Engineering,Guiyang Institute of Information Science and Technology,550025,Guiyang,China;Guizhou Zhongjian Architectural Research and Design Institute,550009,Guiyang,China;Guizhou Building Science Research and Testing Center,550025,Guiyang,China)

机构地区：[1]贵阳信息科技学院土木工程系,贵阳550025 [2]贵州中建建筑科研设计院,贵阳550009 [3]贵州省建筑科学研究检测中心,贵阳550025

出　　处：《建筑技术》2024年第3期354-358,共5页Architecture Technology

基　　金：贵州省科技计划项目(黔科合基础[2020]1Y246);教育部产学研协同育人项目(220603260303931)。

摘　　要：为满足机制砂混凝土的超高强与超高泵送性能需求,开展超高泵送超高强机制砂自密实混凝土制备技术研究,研制的C120机制砂自密实混凝土坍落度达270 mm、扩展度达730 mm、倒置坍落度筒时间为3.2 s,水化温升峰值温度小于80℃,28 d抗压强度高达127.3 MPa、电通量小于500 C,最大收缩低于4×10^(-8) m。研制的C120机制砂自密实混凝土在贵阳国际金融中心成功应用,一次性垂直泵送401 m,在泵送过程中未发生堵管等事故,钻取的芯样完整。另外,现场留样的混凝土和钻取的芯样28 d抗压强度均满足大于120 MPa的性能要求。In order to meet the ultra-high strength and ultra-high pumping performance requirements of concrete with manufactured sand,this paper conducts research on the preparation technology of ultra-high pumping and ultra-high-strength concrete with manufactured sand.The prepared C120 self-compacting concrete with manufactured sand has a slump of 270mm,a slump flow of 730mm and an inverted slump time of 3.2s.The peak value of hydration temperature is less than 80°C.The hardened concrete has a 28d compressive strength of 127.3MPa,an electric flux less than 500C and a maximum-8 shrinkage lower than 4×10_(-8) m.The prepared C120 self-compacting concrete with manufactured sand was successfully applied in Guiyang International Financial Center.It was pumped 401 m vertically at one time.During the pumping process,no accidents such as pipe blockage occurred,and the core sample drilled were complete.In addition,the 28 d compressive strength of concrete retained in the field and the drilled core samples both met the performance requirement of more than 120MPa.

关 键 词：C120 机制砂 超高强混凝土 超高泵送 工程应用 

分 类 号：TU528.01[建筑科学—建筑技术科学]