超高层泵送对混凝土自密实性能的影响  

Effect of super high-rise pumping on self-compacting performance of concrete

作　　者：王子赓 沈佳乐 李战国[1] 金彩云[2] 李悦[1] WANG Zigeng;SHEN Jiale;LI Zhanguo;JIN Caiyun;LI Yue(Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Key Laboratory of Urban Security and Disaster Engineering,MOE,Beijing 100124,China;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Department of Science,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室工程抗震与结构诊治北京市重点实验室,北京100124 [2]北京工业大学理学部,北京100124

出　　处：《混凝土》2022年第12期117-120,126,共5页Concrete

基　　金：国家自然科学基金“基于遗传算法的泵送高强抗裂混凝土优化设计及其流动性数值分析”(51808015);国家重点研发计划(十三五)“高抗裂预拌混凝土关键材料及制备技术”(2017YFB0310100);北京市教育委员会科技计划一般项目“超高层机制砂混凝土泵送性能及收缩机理的研究”(KM202110005018)。

摘　　要：超高层泵送作为超高层建筑建造过程中一项重要的施工技术,仍然存在着堵管或爆管等问题。通过测试超高层泵送前后C40和C60两种自密实混凝土(SCC)的坍落度、扩展度、J环扩展度和离析率来研究超高层泵送对SCC填充性、间隙通过性和抗离析性的影响,从而评价SCC的自密实性能。研究结果表明,超高层泵送后的SCC抗离析能力有所提升,其提升程度随着泵送高度的增加而增大,而超高层泵送会降低SCC的填充性和间隙通过性,并且降低程度随着泵送高度的增加而增大。As an important construction technology in the construction process of super high-rise buildings,there are still some problems,such as pipe plugging or pipe explosion.The slump,expansion,J-ring expansion and segregation rate of C40 and C60 self-compacting concrete(SCC)before and after pumping in super high-rise building were tested to study the influence of pumping on the filling capacity,gap trafficability and segregation resistance of SCC,so as to evaluate the self-compacting performance of concrete.The results showed that the anti-segregation ability of SCC was improved after super high-rise pumping,and the degree of improvement increased with the increase of pumping height.However,super high-rise pumping reduced the filling and clearance trafficability of SCC,and the degree of reduction increased with the increase of pumping height.

关 键 词：超高层泵送 自密实混凝土 填充性 间隙通过性 抗离析性 

分 类 号：TU528.53[建筑科学—建筑技术科学]