磷石膏对氯氧镁水泥性能的影响研究  

Study on the influence of phosphogypsum on the performance of magnesium oxychloride cement

作　　者：杨龙龙 张丽娟[1] 董金美[2] 郑卫新[2] 盛程辉 周晶[3] YANG Longlong;ZHANG Lijuan;DONG Jinmei;ZHENG Weixin;SHENG Chenghui;ZHOU Jing(School of Chemistry and Material Science,Qinghai Minzu University,Xining 810007,China;Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lake,Chinese Academy of Sciences,Xining 810008,China;School of Civil Engineering,Lanzhou University of Science and Technology,Lanzhou 730030,China)

机构地区：[1]青海民族大学化学与材料科学学院,青海西宁810007 [2]中国科学院青海盐湖研究所盐湖资源综合高效利用重点实验室,青海西宁810008 [3]兰州理工大学土木工程学院,甘肃兰州730030

出　　处：《新型建筑材料》2025年第4期96-102,153,共8页New Building Materials

基　　金：中国科学院西部青年学者项目(2022000018);青海省“昆仑人才”高端创新创业人才项目。

摘　　要：研究磷石膏(PG)、粉煤灰(FA)、磷酸(PA)对氯氧镁水泥(MOC)凝结时间、流动性、抗压强度和耐水性的影响,通过XRD、TGA、SEM、MIP分析影响机理。结果表明,空气养护下,与未掺组相比,PG掺量100%时MOC终凝时间延长了69.05%,流动度增大了41.57%,28 d抗压强度降低了46.9%;但浸水后未掺组抗压强度迅速降低,14 d已无法测得其抗压强度,而掺100%PG+1%PA的MOC浸水28 d抗压强度保留率为86%,说明MOC耐水性大幅提高。掺入PG会减少5·1·8相形成,导致空气养护下MOC强度降低,抑制了5·1·8相水解,提高了MOC的耐水性。The effects of incorporating PG,fly ash(FA),and phosphoric acid(PA) on the setting time,flowability,compressive strength,and water resistance of Magnesium oxychloride cement(MOC) were investigated.The underlying mechanisms were analyzed through X-ray diffraction(XRD),thermogravimetric analysis(TGA),scanning electron microscopy(SEM),and mercury intrusion porosimetry(MIP).The results showed that under air-cured conditions,compared with the unadmixed group,when the PG content was 100%,the final setting time of the MOC paste was prolonged by 69.05%,the flowability increased by 41.57%,and the 28-day compressive strength decreased by 46.9%.However,after immersion in water,the compressive strength of the unadmixed MOC group decreased rapidly,and its compressive strength could not be measured after 14 days.In contrast,the MOC with 100% PG and 1% PA retained a compressive strength of 86% after 28 days of water immersion,indicating a significant improvement in water resistance.This is because the incorporation of PG reduces the formation of the 5·1·8 phase,leading to a decrease in the strength of MOC under air-cured conditions.It can also inhibit the hydrolysis of the 5·1·8 phase,thereby enhancing the water resistance of MOC.

关 键 词：磷石膏 氯氧镁水泥 抗压强度 耐水性 

分 类 号：TU526[建筑科学—建筑技术科学]