摘要
选取国内特色膨润土矿物作为预拌砂浆保水增稠材料,研究了膨润土种类(钙基膨润土、钠基膨润土、锂基膨润土)及其掺量对预拌砂浆性能的影响。结果表明,不同类型的三种膨润土在预拌砂浆中均具有增稠保水功能;膨润土的掺入能够使预拌砂浆湿密度降低,但掺量过多将影响砂浆力学性能;相比于钙基和钠基膨润土,锂基膨润土在较低掺量下即具有较好的保水增稠效果;减水剂的掺入可在保证掺膨润土预拌砂浆稠度的前提下,有效降低用水量、提高力学性能;在优选配合比下,钙基、钠基膨润土与纤维素醚复掺在改善预拌砂浆保水率、28 d力学性能方面均优于单掺纤维素醚或膨润土。
Local characteristics bentonite mineral was used as the water-retentive and plastic material to prepare ready-mixed mortar and the effect of the type(Ca-bentonite,Na-bentonite,Li-bentonite)and the content of bentonite on performance of ready-mixed mortar was studied.The results show that three different types of bentonite have thickening and water retention functions in ready-mixed mortar.The addition of bentonite can reduce the wet density of ready-mixed mortar but decrease the mechanical properties when excessive addition of bentonite.Compared with Ca-bentonite and Na-bentonite,Li-bentonite with lower dosage has better water retention and thickening effect.The addition of water reducing agent in bentonite ready-mixed mortar can effectively reduce the water consumption and improve the mechanical properties under proper consistency.Composites of cellulose ether and Ca-bentonite/Na-bentonite can improve the water retention rate and 28 d strength of the ready-mixed mortar,which are superior to the cellulose ether or bentonite used alone.
作者
杨泽青
李军
卢忠远
邓鑫
YANG Ze-qing;LI Jun;LU Zhong-yuan;DENG Xin
出处
《混凝土与水泥制品》
北大核心
2019年第12期78-82,共5页
China Concrete and Cement Products
基金
国家重点研发计划项目(2016YFC0701004)
四川省科技计划项目(2018GZ0152)
关键词
膨润土
保水增稠材料
预拌砂浆
性能
Bentonite
Water-retentive and plastic materials
Ready-mixed mortar
Performance
