高掺量磷石膏稳定土配伍性与微观机理研究  

Research on the compatibility and microscopic mechanism of high content phosphogypsum stabilized soil

作　　者：李德高 程寅[2] 念志伟 邹东博 马航 万邦隆 沈君 LI Degao;CHENG Yin;NIAN Zhiwei;ZOU Dongbo;MA Hang;WAN Banglong;SHEN Jun(R&D Center,Yunnan Yuntianhua Co.Ltd.,Kunming 650228,China;China Academy of Transportation Sciences,Beijing 100029,China)

机构地区：[1]云南云天化股份有限公司研发中心,云南昆明650228 [2]交通运输部科学研究院,北京100029

出　　处：《新型建筑材料》2025年第3期11-15,21,共6页New Building Materials

基　　金：2022年度交通运输行业重点科技项目(2022-MS5-133);中央公益性科研院所基本业务费项目(20247505)。

摘　　要：从击实特性、加州承载比、无侧限抗压强度等指标分析80%掺量磷石膏稳定3种路基土的配伍性,并分析其微观作用机理。结果表明:磷石膏稳定低液限黏土的配伍性最优,相较于纯磷石膏,其干密度、加州承载比、无侧限抗压强度分别增大6.5%、18%、33%,膨胀量、吸水率分别减小27%、6%,试样中黏土矿物颗粒与磷石膏薄片状结构发生物理粘结,硅酸盐矿物峰值升高、孔隙减小,微观结构趋于致密;磷石膏稳定高液限红黏土的配伍性最差,相较于纯磷石膏,其干密度、吸水率、膨胀量分别增大5%、46%、34%,加州承载比、无侧限抗压强度分别降低30%、57%;磷石膏与低液限粉土的物理性质相似,其配伍性不明显。Based on indicators such as compaction characteristics,California Bearing Ratio(CBR),and unconfined compressive strength,this study analyzed the compatibility of 80%phosphogypsum stabilized three types of subgrade soils and investigated their microscopic interaction mechanisms.The results demonstrate that phosphogypsum stabilized low liquid limit clay exhibits optimal compatibility.Compared with pure phosphogypsum,its dry density,CBR,and unconfined compressive strength increased by 6.5%,18%,and 33%respectively,while expansion and water absorption decreased by 27%and 6%.Microscopic analysis revealed physical bonding between clay mineral particles and phosphogypsum lamellar structures,intensified silicate mineral peaks,reduced porosity,and a more compact microstructure.Phosphogypsum stabilized high liquid limit red clay shows the poorest compatibility,with dry density,water absorption,and expansion increasing by 5%,46%,and 34%respectively,while CBR and unconfined compressive strength decreased by 30%and 57%compared to pure phosphogypsum.The physical properties of phosphogypsum and low liquid limit silt are found to be similar,showing no significant compatibility.

关 键 词：道路工程 高掺量磷石膏 稳定土 配伍性 微观机理 

分 类 号：TU441[建筑科学—岩土工程]