再生砂混凝土的吸水与抗氯离子渗透性能影响因素研究  

Study on influencing factors of water absorption and chloride ion penetration resistance of recycled sand concrete

作　　者：易浩[1] 李北星[1] 殷实 陈鹏博 YI Hao;LI Beixing;YIN Shi;CHEN Pengbo(State Key Laboratory of Silicate Materials for Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070

出　　处：《混凝土》2024年第11期61-66,73,共7页Concrete

基　　金：国家重点研发计划项目(2020YFC1909904)。

摘　　要：为了探明再生砂混凝土的吸水性能和抗氯离子渗透性能特性,研究了水胶比(0.37、0.45、0.58)、再生砂掺量(0、30%、50%、70%、100%)、再生砂中微粉含量(3%、7%、10%)、矿物掺合料品种和掺量、再生砂预湿程度(0、50%、100%)等因素对再生砂混凝土体积吸水率、软化系数和电通量的影响,对比了不同影响因素对再生砂混凝土吸水性能和抗氯离子渗透性能的影响程度。结果表明:随着再生砂掺量和微粉含量的增加,混凝土的吸水性能增强、耐水性降低、抗氯离子渗透性能下降;而通过掺入多元复合矿物掺合料(15%粉煤灰+15%矿粉+8%硅灰)、降低水胶比和提高再生砂的预湿程度,均能不同程度改善再生砂混凝土的吸水性能和抗氯离子渗透性能。In order to ascertain the characteristics of water absorption and chloride ion permeability resistance of recycled sand concrete,the effects of five factors on the volume water absorption,softening coefficient and electric flux of recycled sand concrete were investigated,including the ratio of water to binder(0.37,0.45,0.58),the replacement ratio of recycled sand(0,30%,50%,70%,100%),the content of fine powder in the recycled sand(3%,7%,10%),the type and amount of mineral admixtures and the pre-wetting degree of recycled sand(0,50%,100%).The influence level of different factors on the water absorption and chloride ion permeability resistance of recycled sand concrete were compared.The results show that with the increase of replacement ratio of recycled sand and fine powder content,the water absorption performance of concrete is enhanced,the water resistance is reduced,and the chloride ion penetration resistance is decrease.The water absorption and the chloride ion penetration resistance of recycled sand concrete can be improved in different degree by adding ternary composite mineral admixtures(15%fly ash+15%slag powder+8%silica fume),decreasing the water-binder ratio and increasing the pre-wetting degree of recycled sand.

关 键 词：再生砂混凝土 吸水性能 电通量 软化系数 影响因素 

分 类 号：TU528.01[建筑科学—建筑技术科学]