微珠对超高强泵送混凝土性能的影响研究  

The Influence of Microbeads on the Performance of Ultra-high Strength Pumped Concrete

作　　者：王宁[1] 

机构地区：[1]沈阳工学院,辽宁沈阳113122

出　　处：《混凝土世界》2025年第2期34-38,共5页China Concrete

摘　　要：通过引入优质超细矿物掺合料微珠,调整胶凝材料组成比例,研究微珠对异形多腔巨型柱超高强泵送混凝土性能的影响。结果 表明:当微珠掺量为2 0%时,胶凝材料的压实空隙率降至最小,为33.43%,硬化水泥石中的累计孔容积比基准样本减少了43.6%,最大孔半径只有基准样本的6.1%;超高强泵送混凝土的扩展度达到695mm,扩展度与J环扩展度之差为0mm,离析率为5.7%,7、28、56d抗压强度分别为95.6、122.2、128.4MPa;混凝土内部最高温度仅为47.9℃,制备的混凝土和易性能优良,整体松软粘度低,水化温升合理,满足超高层泵送施工要求。This article introduces high-quality ultrafine mineral admixture microspheres,adjusts the composition ratio of cementitious materials,and studies the inf luence of microspheres on the performance of ultra-high strength pumped concrete for irregular multi-cavity giant columns.The results show that when the content of microbeads is 20%,the compaction porosity of the cementitious material decreases to a minimum of 33.43%.The cumulative pore volume in the hardened cement stone decreases by 43.6%compares to the reference sample,and the maximum pore radius is only 6.1%of the reference sample.The expansion of ultra-high strength pumped concrete reaches 695 mm,with a difference of 0 mm between the expansion and J-ring expansion,and a segregation rate of 5.7%.The compressive strengths at 7,28 and 56 days are 95.6,122.2 and 128.4 MPa,respectively;the maximum temperature inside the concrete is only 47.9℃,and the prepared concrete offers excellent workability,softness,low viscosity,and a reasonable hydration temperature rise,meeting the needs of super high-rise pumping construction.

关 键 词：胶凝材料 密实度 自密实性能 流变性能 抗压强度 温差 

分 类 号：TU528.53[建筑科学—建筑技术科学]