减水剂掺量对碱激发偏高岭土地质聚合物流动性和力学性能的影响  

Influence of water reducing agent admixtures on the fluidity and mechanical properties of alkali-excited biased metakaolin geopolymer

作　　者：赵三欣 马元洁 谢东武[2] ZHAO Sanxin;MA Yuanjie;XIE Dongwu(School of Civil Engineering,Shangqiu University,Kaifeng 475000,China;Department of Underground Architecture and Engineering,School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]商丘学院土木工程学院,河南开封475000 [2]同济大学土木工程学院地下建筑与工程系,上海200092

出　　处：《混凝土》2023年第9期88-91,共4页Concrete

基　　金：国家自然科学基金(41977227)。

摘　　要：为降低传统硅酸水泥制备过程中产生的CO_(2)对环境的影响。采用偏高岭土(MKL)为原料制备地质聚合物,并研究不同掺量的三聚氰胺减水剂(MWR)对碱激发偏高岭土地质聚合物的流动性及力学性能影响。研究结果表明:MWR对偏高岭土地质聚合物浆体的流动性并没有改善,反而高掺量的减水剂会造成流动损失。此外,浆体的含水率随着MWR掺量的增加而减少,在MWR的掺量为2%时,浆体具有更好的流动性和力学性能。随着MWR掺量的增加,浆体中的孔隙结构增大;但是高掺量的MWR有利于浆体中水的排出,进而增大浆体的抗压强度,从而造成浆体的抗压强度先减少而增大。In order to reduce the environmental impact of CO_(2) generated during the preparation of conventional silicate cements.The geopolymer was prepared using metakaolin(MKL)as raw material,and the effect of different dosing levels of melamine water reducing agent(MWR)on the flow and mechanical properties of alkali-excited metakaolin geopolymer was investigated.The results of the study show that MWR does not improve the flowability of the metakaolin geopolymer slurry,but rather the high admixture of water reducing agent causes flow loss.In addition,the water content of the slurry decreases with increasing MWR admixture and the slurry has better flow and mechanical properties at 2%MWR admixture.The pore structure in the slurry increases as the MWR admixture increases.However,the high admixture of MWR facilitates the discharge of water from the slurry,which in turn increases the compressive strength of the slurry,thus causing the compressive strength of the slurry to first decrease and then increase.

关 键 词：偏高岭土地质聚合物 碱激发 三聚氰胺减水剂 力学性能 流动性 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]