聚羧酸减水剂对脱硫建筑石膏的改性及机理研究  

Research on Modification and Mechanism of Polycarboxylate Superplasticizer on Desulfurization Building Gypsum

作　　者：王雪晴 管学茂[1] 郅真真 WANG Xueqing;GUAN Xuemao;ZHI Zhenzhen(School of Materials Science and Technology,Henan Polytechnic University,Jiaozuo 454000,China;School of Materials Science and Technology,Luoyang Institute of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454000 [2]洛阳理工学院材料科学与工程学院,河南洛阳471023

出　　处：《洛阳理工学院学报(自然科学版)》2025年第1期1-6,共6页Journal of Luoyang Institute of Science and Technology:Natural Science Edition

基　　金：国家自然科学基金项目(U2905216).

摘　　要：以β-半水脱硫石膏(β-HDG)为原料,研究不同掺量聚羧酸高性能减水剂(PCE)对β-HDG水化过程中的流动性、吸附行为、浆体Zeta电位以及抗压强度的影响。通过扫描电子显微镜(SEM)、X-射线衍射(XRD)分析PCE作用下石膏硬化体的晶体组成和微观形貌。结果表明:PCE的加入能够增加石膏浆体的流动度,提高石膏硬化体的力学强度;当PCE掺量为0.4%时,石膏浆体流动度达到248 mm,石膏浆体标稠需水量降低至37%,PCE减水率达到26%,石膏硬化体抗压强度、抗折强度分别为24.7 MPa、5.81 MPa,比空白样分别提高32.6%和21.5%。PCE的加入并没有改变石膏硬化体的晶体相组成,但使晶体之间网状搭接更紧密,需水量的降低,内部孔隙的降低,是石膏硬化体宏观强度增加的关键因素。Theβ-hemihydrate desulfurization gypsum(β-HDG)is taken as the raw material,the influence of different dosages of PCE on fluidity,adsorption behavior,zeta potential of gypsum slurry,and compressive strength of gypsum hardened specimens were studied.The crystal composition and microstructure of gypsum hardened specimens were analyzed through scanning electron microscopy(SEM)and X-ray diffraction(XRD).The results show that the addition of PCE can increase the fluidity of gypsum slurry and improve the mechanical strength of gypsum hardened specimens.When the PCE content is 0.4%,the fluidity of gypsum slurry reaches 248 mm,the water requirement for gypsum slurry decreases to 37%,and the water reduction rate reaches 26%.The compressive strength and flexural strength of gypsum hardened body are 24.7 MPa and 5.81 MPa,respectively,which are 32.6%and 21.5%higher than the blank sample.The addition of PCE does not change the crystal phase composition of gypsum hardened specimens,only making the network overlap between crystals tighter.The reduction of the water demand and internal pores are the key factors for increasing the macroscopic strength of gypsum hardened specimens.

关 键 词：β-半水脱硫石膏 聚羧酸高性能减水剂 流动性 吸附行为 抗压强度 

分 类 号：TQ177[化学工程—硅酸盐工业]