纤维素醚对石膏基自流平砂浆性能的影响研究  

Study of the effect of cellulose ether on the properties of gypsum-based self-leveling mortar

作　　者：张明涛 王泽萍 唐晗 赵敏 李鑫 古富鹏 张静文 ZHNAG Mingtao;WANG Zeping;TANG Han;ZHAO Min;LI Xin;GU Fupeng;ZHANG Jingwen(School of Civil Engineering and Architecture,Chongqing University of Science and Technology,Chongqing 401331,China;School of Civil Engineering,Yangtze Normal University,Chongqing 408100,China)

机构地区：[1]重庆科技大学建筑工程学院,重庆401331 [2]长江师范学院土木建筑工程学院,重庆408100

出　　处：《混凝土与水泥制品》2024年第11期70-74,共5页China Concrete and Cement Products

基　　金：国家自然科学基金项目(52100136);重庆科技大学研究生创新计划项目(YKJCX2220651);重庆科技大学科研项目(ckrc202212037)。

摘　　要：研究了羟丙基甲基纤维素醚(HPMC)的掺量对石膏基自流平砂浆流动度、凝结时间、力学性能、保水性能的影响,并采用Hershel-Bulkley模型(H-B模型)对该石膏基自流平砂浆的流变性能进行了拟合分析。结果表明:掺入HPMC虽降低了石膏基自流平砂浆的初始流动度,但提高了砂浆的30 min流动度;掺入HPMC会对石膏基自流平砂浆的力学性能产生不利影响,随着HPMC掺量从0增加至0.10%,砂浆28 d的绝干抗压强度由19.5 MPa降低至12.8 MPa;HPMC的掺入能显著改善石膏基自流平砂浆的保水性,当其掺量为0.07%时,砂浆保水率为81.6%,较未掺HPMC组提高了近41%;当HPMC掺量从0增加到0.07%时,石膏基自流平砂浆的塑性黏度逐渐增大,但当HPMC掺量增大至0.10%时,塑性黏度变小,自流平砂浆出现假塑现象。The effects of hydroxypropyl methylcellulose ether(HPMC)content on the fluidity,setting time,mechanical properties and water retention of gypsum-based self-leveling mortar were investigated.The rheological curves of gypsum-based self-leveling mortar were fitted with Hershel-Bulkley model(H-B model).The results show that the incorporation of HPMC decreases the initial fluidity of gypsum-based self-leveling mortar,but increases its 30 min fluidity.The incorporation of HPMC has a negative effect on the mechanical properties of gypsum-based self-leveling mortar,when the content of HPMC increases from 0 to 0.10%,the absolute dry compressive strength of the mortar decreases from 19.5 MPa to 12.8 MPa.The incorporation of HPMC can significantly improve the water retention of gypsum-based self-leveling mortar,when its content is 0.07%,the water retention rate of mortar is 81.6%,which is increased by nearly 41% compared with the unadulterated HPMC group.The plastic viscosity of gypsum-based self-leveling mortar gradually increases when the HPMC content is increased from 0 to 0.07%,while the plastic viscosity becomes smaller and the self-leveling mortar appears to be pseudo-plastic when the HPMC content is increased to 0.10%.

关 键 词：羟丙基甲基纤维素醚 石膏基自流平砂浆 流变性能 保水性 拟合分析 

分 类 号：TQ177.3[化学工程—硅酸盐工业]