【摘要】 为减少泵送高强轻骨料混凝土在振捣过程中轻骨料的上浮现象,使用5种不同轻骨料,选择了拌和物密度、粗骨料质量以及抗压强度3种评价拌合物抗振捣分离性指标,系统研究了轻骨料体积含量、振捣时间、轻骨料特性(包括外形、表面光滑度、吸水率)和矿物掺和料以及外加剂对低水胶比的泵送高强轻骨料混凝土抗离析性的影响。更多还原

【Abstract】 To reduce the segregation of fresh high strength lightweight aggregate concrete(HSLWAC) in vibrating process,the vibrating-layering tests were carrying out with 5 types of lightweight aggregates.The segregation capability is judged by the layering degree,the layering degree is calculated by 3 methods,including the density difference,the coarse aggregate mass difference and the difference of compressive strength molding by that between roof and bottom.Investigated the factors of LWA’s volume quantity,vibrating time,and the characters of LWA(include external form,surface smooth level,water absorption),mineral additives and admixtures in the segregation of pumping HSLWAC with lower water to binder ratio.更多还原