不同机制砂与聚羧酸减水剂的相容性及机理分析  

Analysis on the compatibility between different manufactured sand and polycarboxylate superplasticizer and its mechanism

作　　者：侯云芬[1] 刘锦涛 郑东昊 HOU Yunfen;LIU Jintao;ZHENG Donghao(Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学,北京100044

出　　处：《新型建筑材料》2019年第3期74-78,117,共6页New Building Materials

摘　　要：选择5种不同岩石制备的机制砂和2种不同侧链密度的聚羧酸减水剂,研究机制砂与聚羧酸减水剂的相容性。结果表明,5种机制砂与减水剂相容性排序为:石灰岩>花岗岩>片麻岩>辉绿岩>凝灰岩。机制砂岩石的成岩过程,表面织构以及岩石酸碱性对其相容性影响很大。属于火山碎屑岩的凝灰岩孔隙率高,遇水容易崩解,属于浅成岩浆岩的辉绿岩不致密,吸水率大,这2种机制砂与减水剂的相容性差;片麻岩机制砂表面坑洼多,不平坦,比表面积大,吸附性较强,相容性较差;碱性石灰岩机制砂亲水性差,吸水性差,相容性好。In this paper,five kinds of manufactured sands made by different rocks and two kinds of polycarboxylate superplasticizers with different side chain density were selected to study their compatibility. The results showed the order of compatibility between manufactured sand and polycarboxylate superplasticizer:limestone>granite>gneiss>diabase>tuff. It was concluded that the diagenesis process,surface texture and alkalinity of manufactured sand greatly affected the compatibility. Tuff which belongs to pyroclastic rocks has high porosity and is easy to disintegrate when encountering water. Diabase which belongs to the shallow magmatic rock is not dense and can absorb more water. The compatibility of these two kinds of manufactured sand is poor. Gneiss manufactured sand has many holes and uneven surface,large specific surface area,strong adsorption and poor compatibility. The limestone which is alkaline rock is not hydrophilicity and has good compatibility.

关 键 词：聚羧酸减水剂 相容性 机制砂 岩石特性 表面织构 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]