脱硫石膏基与磷石膏基自流平砂浆的性能差异研究  

Study on performance difference between desulfurization gypsum-based and phosphogypsum-based self-leveling mortars

作　　者：戴浩 宋旭艳[2] 孔俊俊 宋丹丹 穆鑫泉 张雪飞 DAI Hao;SONG Xuyan;KONG Junjun;SONG Dandan;MU Xinquan;ZHANG Xuefei(Jiangsu Zhaojia Materials Technology,Co.,Ltd.,Suzhou 215151,China;Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]江苏兆佳建材科技有限公司苏州分公司,江苏苏州215151 [2]苏州科技大学,江苏苏州215009

出　　处：《混凝土与水泥制品》2024年第8期91-96,共6页China Concrete and Cement Products

摘　　要：分别对比研究了水泥掺量(0、2.5%、5.0%、7.5%、10.0%)和氢氧化钙掺量(0、0.25%、0.50%、1.00%、2.00%)对脱硫石膏基自流平砂浆(S砂浆)和磷石膏基自流平砂浆(P砂浆)工作性和力学性能的影响,分析了磷酸盐和二水石膏含量对S砂浆性能的影响机理。结果表明:随着水泥掺量的增加,S、P砂浆的流动度均先增加后趋于平稳,初凝时间基本先延长后缩短,S砂浆的24 h抗压强度先升高后降低,P砂浆的24 h抗压强度先降低后升高;随着氢氧化钙掺量的增加,S、P砂浆的初凝时间均先延长后缩短再趋于平稳,S砂浆的流动度先增加后趋于平稳,P砂浆的流动度先增加后降低,24 h抗压强度变化规律与掺水泥时相同;磷酸盐的掺入降低了S砂浆的流动度降低,但在一定的水泥或氢氧化钙掺量范围内,磷酸盐能提高S砂浆的强度;二水石膏的掺入降低了S砂浆的流动度保持能力和强度。The effects of cement content(0,2.5%,5.0%,7.5%,10.0%)and calcium hydroxide content(0,0.25%,0.50%,1.00%,2.00%)on the workability and mechanical properties of desulfurization gypsum-based self-leveling mortar(S-mortar)and phosphogypsum-based self-leveling mortar(P-mortar)were compared and studied.The influence mechanism of phosphate and dihydrate gypsum content on the performance of S-mortar was analyzed.The results show that with the increase of cement content,the fluidity of S-mortar and P-mortar first increases and then tends to stabilize,and the initial setting time is basically extended and then shortened.The 24 h compressive strength of S-mortar first increases and then decreases,while the 24 h compressive strength of P-mortar first decreases and then increases.With the increase of calcium hydroxide content,the initial setting time of S-mortar and P-mortar first extends and then shortens and then tends to stabilize,the fluidity of S-mortar first increases and then tends to stabilize,while the fluidity of P-mortar first increases and then decreases.The 24 h compressive strength change pattern is the same as when adding cement.The addition of phosphate reduces the fluidity of S-mortar,but within a certain range of cement or calcium hydroxide content,phosphate can improve the strength of S-mortar.The addition of dihydrate gypsum reduces the ability to maintain the fluidity and strength of S-mortar.

关 键 词：脱硫石膏 磷石膏 自流平砂浆 磷酸盐 二水石膏 性能研究 

分 类 号：TQ177.6[化学工程—硅酸盐工业]