缓凝剂与级配优化对混凝土泵送性能的影响OA
Effect of retarder and grading optimization on pumping performance of concrete
为减少泵送施工对新拌混凝土性能的影响,研究了缓凝剂掺量对新拌混凝土流动性能的影响,分析了骨料级配优化对混凝土泵送性能的影响规律.结果表明:缓凝剂的加入,有效抑制了水泥水化作用,延长了混凝土凝结时间;1.0％的缓凝剂掺量对混凝土静置6 h后的流动性能改善效果最佳;将大粒径骨料以10％的比率取代连续级配粗骨料,可以优化泵送混凝土骨料级配,有效弥补循环泵送过程对混凝土中骨料的破坏作用,实现混凝土工作性能、流变性能与抗压强度最佳;采用混凝土缓凝技术与骨料级配优化相结合,可实现混凝土泵送过程中工作性能与骨料稳定性的双重优化,从而提升混凝土的可泵性.
To minimize the impact of pumping on the performance of fresh concrete,this study examined the effect of retarder dosage on the fluidity of fresh concrete and evaluated the influence of aggregate grading optimization on the pumping performance of concrete.The results indicate that the addition of a retarder effectively inhibits cement hydration and prolongs the setting time of concrete.1.0％retarder dosage yields the optimal improvement in concrete flowability after 6 hours of standing.Replacing 10％of the continuous graded coarse aggregate with large-sized aggregate optimizes the aggregate gradation of pumped concrete,mitigating the detrimental effects of aggregates during cyclic pumping and achieving the optimal workabitity,rheological properties,and compressive strength.Combining concrete retarding technology with aggregate grading optimization achieves dual improvements in work performance and aggregate stability during the pumping process,thereby enhancing the pumpability of concrete.
杨伟;王计远;段珍华;丁梦娟;傅昊玮;王佳茜;吕振源
同济大学 土木工程学院,上海 200092鸿翔环境科技股份有限公司,浙江 海宁 314400同济大学 土木工程学院,上海 200092清华大学 深圳国际研究生院海洋工程研究院,广东 深圳 518055新加坡国立大学 土木与环境工程学院,新加坡 117576起重机械关键技术全国重点实验室,湖南 长沙 410083同济大学 土木工程学院,上海 200092||中国建筑第八工程局有限公司,上海 200112
建筑与水利
缓凝剂掺量级配优化循环泵送工作性能流变性能
retarder dosagegrade optimizationcyclic pumpingworkabilityrheological properties
《湖南大学学报（自然科学版）》 2026 (5)
101-109,9
新疆自治区重点项目(2022D01D27),Xinjiang Autonomous Region Key Projects(2022D01D27)
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