原材料和氧化物成分对地聚物砂浆性能的影响  

Influence of raw materials and oxide composition on the properties of geopolymer mortar

作　　者：赵云 毕继红[2] 刘晓敏 许云龙 周俊龙 段磊 ZHAO Yun;BI Jihong;LIU Xiaomin;XU Yunlong;ZHOU Junlong;DUAN Lei(China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300171,China;School of Architecture and Engineering,Tianjin University,Tianjin 300072,China;CSCEC City Construction Development Co.,Ltd.,Beijing 100037,China)

机构地区：[1]中国建筑第六工程局有限公司,天津300171 [2]天津大学建筑工程学院,天津300072 [3]中建城市建设发展有限公司,北京100037

出　　处：《混凝土》2024年第5期126-129,141,共5页Concrete

基　　金：中建股份科技研发课题(CSCEC-2021-Z-10);特种混凝土性能与施工技术研究(CSCEC6B-2022-Z-3);国家自然科学基金(51227006)。

摘　　要：通过改变偏高岭土、矿渣粉和粉煤灰的组合和掺加比例,设计了10组地聚物砂浆配合比,测试地聚物砂浆的凝结时间、流动性能、抗压强度和抗折强度,研究原材料的混合比对地聚物砂浆性能的影响,并分析氧化物成分对地聚物砂浆力学性能的影响。结果表明:掺入矿渣粉或偏高岭土显著减弱新拌地聚物砂浆的流动性能;地聚物砂浆的凝结时间随着矿渣粉掺量的增加而显著减少,基本不受偏高岭土掺量的影响;含有3种原材料的地聚物砂浆的抗压强度与抗折强度均高于含有单种或两种原材料的地聚物砂浆,且含有30%偏高岭土、30%矿渣粉和40%粉煤灰的三元地聚物砂浆具有最高的28 d抗压强度(123.6 MPa)和抗折强度(10.4 MPa),具有制备超高性能混凝土的潜力;当SiO_(2)/Al_(2)O_(3)比处于0.72~0.79,且CaO/SiO_(2)比处于0.4~0.5时,地聚物砂浆的28 d抗压强度不低于97.8 MPa,最高可达到121.2 MPa。10 groups of geopolymer mortars were prepared by changing the combination and proportion of metakaolin,ground granulated blast furnace slag(GGBFS)and fly ash.The setting time,flowability,compressive strength and flexural strength of geopolymer mortars were tested.The influence of the mixing ratio of raw materials on the properties of geopolymer mortars was investigated,and the effect of oxide composition on the mechanical properties of geopolymer mortars was analyzed.The results showed that adding GGBFS or metakaolin significantly weakened the flowability of fresh geopolymer mortars.The seting time of geopolymer mortars decreased significantly with the increase of the content of GGBFS,and was basically not affected by the content of metakaolin.The compressive strength and flexural strength of the geopolymer mortars containing three mineral admixtures were higher than those of the geopolymer mortars containing single or two mineral admixtures.The ternary geopolymer mortar containing 30%metakaolin,30%GGBFS and 40%fly ash had the highest 28 d compressive strength(123.6 MPa)and flexural strength(10.4 MPa),which has the potential to prepare ultra-high performance concrete.When the range of SiO_(2)/Al_(2)O_(3) ratio was from 0.72 to 0.79 and the range of CaO/SiO_(2) ratio was from 0.4 to 0.5,the geopolymer mortar was not less than compressive strength of 97.8 MPa,and their highest strength reached 121.2MPa.

关 键 词：地聚物砂浆 偏高岭土 氧化物 粉煤灰 

分 类 号：TU528.01[建筑科学—建筑技术科学]