有机无机复合固化剂稳定磷石膏路基填料的性能研究  

Study on the performance of phosphogypsum subgrade material stabilized with organic-inorganic composite curing agents

作　　者：赵明星 吴建辉 龙宝林 张风臣 王爱双 杨澄 储洪强 ZHAO Mingxing;WU Jianhui;LONG Baolin;ZHANG Fengchen;WANG Aishuang;YANG Cheng;CHU Hongqiang(Liuguo Chemical Industry Co.Ltd.,Tongling 244011,China;College of Materials Science and Engineering,Hohai University,Changzhou 213200,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]安徽六国化工股份有限公司,安徽铜陵244011 [2]河海大学材料科学与工程学院,江苏常州213200 [3]河海大学土木与交通学院,江苏南京210024

出　　处：《新型建筑材料》2024年第12期101-107,共7页New Building Materials

摘　　要：针对磷石膏直接用于路基材料存在强度低和污染物的问题,采用低热硅酸盐水泥、聚丙烯酸钠和减水剂作为有机无机复合固化剂稳定磷石膏用于路基填料,研究了聚丙烯酸钠掺量和试件压实度对路基填料无侧限抗压强度和特征污染物浸出量的影响,分析磷石膏路基填料固化机理。结果表明:随聚丙烯酸钠掺量的增加,磷石膏路基填料的7、28 d无侧限抗压强度先提高后降低,浸出液中的特征污染物浓度持续减小。100%压实度的试件表现出比96%压实度试件更好的无侧限抗压强度和污染物固化能力。当m(水泥)∶m(磷石膏)=10∶90,聚丙烯酸钠和减水剂掺量分别为水泥质量的0.6%和0.8%时,磷石膏利用率90%,无侧限抗压强度符合二级公路标准要求,浸出液中污染物浓度符合GB 8978—1996的要求。Direct use of phosphogypsum as subgrade material presents issues of low strength and potential pollutant release.To address these issues,phosphogypsum was stabilized using a composite organic-inorganic curing agent comprising low-heat Portland cement,sodium polyacrylate,and a water reducer.The study investigated the effects of sodium polyacrylate content and specimen compaction on the unconfined compressive strength(UCS)and characteristic pollutant leaching of the stabilized subgrade material.Additionally,the mechanism of phosphogypsum stabilization was explored.The results demonstrated that as the sodium polyacrylate content increased,the 7 and 28 d UCS of the specimens initially increased and then decreased,while the concentration of characteristic pollutants in the leachate continuously decreased.Furthermore,specimens with 100%compaction showed better UCS and pollutant immobilization than those with 96%compaction.When the cement to phosphogypsum ratio was 10∶90,with sodium polyacrylate and water reducer contents at 0.6%and 0.8%of the cement mass respectively,the phosphogypsum utilization rate was 90%,the UCS met the standards for secondary roads,and the pollutant concentrations in the leachate complied with standard GB 8978—1996.

关 键 词：磷石膏 磷石膏路基材料 水稳定性 聚丙烯酸钠 特征污染物 

分 类 号：TU471.3[建筑科学—结构工程]