河南理工大学学报（自然科学版）2025，Vol.44Issue(5)：187-192,6.DOI:10.16186/j.cnki.1673-9787.2023120038
聚羧酸减水剂对脱硫石膏水化硬化性能的影响与作用机理
Effects and mechanisms of polycarboxylate superplasticizer on the hydration and hardening behavior of construction-grade desulfurized gypsum
摘要
Abstract
Objectives To improve the performance of hardened desulfurized gypsum and promote the re-source utilization of by-product gypsum from flue gas desulfurization in coal-fired power plants,a polycar-boxylate superplasticizer(PCE)was synthesized,and its effects on the hydration and hardening behavior of β-hemihydrate desulfurized gypsum(β-HDG)were investigated.Methods The influence of varying PCE dosages on the fluidity,adsorption behavior,and zeta potential of β-HDG slurry,as well as the compres-sive and flexural strengths of hardened specimens,was studied.X-ray diffraction(XRD)and scanning elec-tron microscopy(SEM)were employed to analyze the crystal phase composition and microstructure of the hardened gypsum.Results As the PCE dosage increased,both slurry fluidity and water-reducing efficiency first increased and then stabilized.At a dosage of 0.4%,the slurry exhibited a maximum fluidity of 248 mm and a 26%water-reduction rate,with standard consistency water demand reduced to 37%.The adsorp-tion capacity of PCE on gypsum surfaces also increased and then stabilized with prolonged adsorption time,reaching a saturation value of 3.6 mg/g at 0.4%dosage.The zeta potential of the slurry decreased with in-creasing PCE content.The compressive and flexural strengths of the hardened gypsum peaked at 24.7 MPa and 5.81 MPa,respectively,representing increases of 32.6%and 21.5%over the blank sample.Conclu-sions The addition of PCE improves slurry workability and reduces water demand for standard consistency,thereby enhancing the mechanical strength of hardened desulfurized gypsum.While the crystal phase com-position remains unchanged,the denser networked crystal structure and lower porosity contribute signifi-cantly to the improved macro-strength of the hardened product.关键词
β-半水脱硫石膏/聚羧酸高效减水剂/硬化/抗折强度/抗压强度Key words
β-Hemihydrate desulfurized gypsum/polycarboxylate superplasticizer/hardening/flexural strength/compressive strength分类
化学化工引用本文复制引用
管学茂,王雪晴,郅真真..聚羧酸减水剂对脱硫石膏水化硬化性能的影响与作用机理[J].河南理工大学学报（自然科学版）,2025,44(5):187-192,6.基金项目
国家自然科学基金资助项目(U1905216) （U1905216）
