机制砂超高强钢管混凝土膨胀性能研究

Study on expansion performance of machine-made sand super high strength concrete filled steel tube

超高强钢管混凝土由其钢管壁密闭环境、低水胶比、高掺硅灰等原因,易产生体积收缩,核心混凝土与钢管壁脱空现象。利用不同种类、掺量膨胀剂配制混凝土,探究不同膨胀剂补偿收缩性能,并探究膨胀性和力学性能协同设计,复配一种满足力学性能及膨胀性良好的膨胀剂,其最优掺量为6%。

Ultra-high strength steel tube concrete is easy to produce volume shrinkage due to the closed environment of steel pipe wall,low water-to-binder ratio and high silica fume,and the core concrete and steel pipe wall are empty.Different types and proportions of expansion agent are used to configure concrete,to explore the shrinkage performance of different expansion agents,and to explore the synergistic design of expansion and mechanical properties,and to mix a swelling agent that satisfies the mechanical properties and good expansion,which best dosage is 6%.