掺稻壳灰活性粉末混凝土配合比试验

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发布时间：2021-11-20

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通过试验研究了掺稻壳灰的活性粉末混凝土 (RPC)的配合比，根据最大密实度理论对掺稻壳
灰的 RPC进行了基本配合比设计；试验比较了石英砂和天然砂 2种细集料对 RPC性能的影响；对
不同水胶比的 RPC进行试验，推荐了适宜水胶比；以稻壳灰替代硅灰，试验研究不同稻壳灰替代率
对 RPC的流动性、强度及耐久性的影响。结果表明：采用天然砂替代石英砂作为细骨料对 RPC抗
折强度、抗压强度及流动度影响不大；掺稻壳灰的 RPC的适宜水胶比为 0．20～0．22；随着稻壳灰
替代硅灰掺量的增加，其收缩率降低且随龄期增长变化减缓，同时其抗氯离子渗透性能有所下降；
建议根据不同使用性能要求选择稻壳灰部分或完全替代硅灰的 RPC。
关键词：稻壳灰；活性粉末混凝土；强度；流动性；收缩；抗氯离子渗透性能；水胶比
中图分类号：TU528．2 文献标志码：A
Experim ent on M ix Proportion of Reactive Powder
Concrete with Rice Husk Ash
ZHU Peng，LI Zong—yang，QU Wen—jun，MAO Wen—ting
(College of Civil Engineering，Tongji University，Shanghai 200092，China)
Abstract： The mix proportion of reactive powder concrete (RPC )with rice husk ash was
investigated through experim ent．On the basis of m axim um density theory， the primary mix
proportion of RPC with rice husk ash was designed． Influences of two kinds of fine aggregate，
such as quartz sand and natural sand，on the property of RPC were investigated．Experiments on
RPC with different water binder ratios were done， and a range for water binder ratio was
suggested．The rice husk ash was used to replace the silica fume in RPC，and the influences of
the replacement ratio on flowability，strength and durability were investigated．The results show
that there is little influence on flexural strength，compressive strength and fluidity by taking
natural sand as fine aggregate replacing quartz sand． The appropriate water binder ratio of RPC
with rice husk ash is 0．20—0．22． W ith the increasing of am ount of rice husk ash replacing silica
fum e，the shrinkage rate reduces and change slowly with ages，and the chloride—penetration
resistance reduces．It is suggested that the silica fum e in RPC can be replaced by rice husk ash
partially or com pletely according to different application requirements
Key words：rice husk ash；reactive powder concrete；strength；flowability；shrinkage；chloride—
penetration resistance；water binder ratio