PMDI对磷石膏沥青混合料水稳定性的影响  

Effect of PMDI on Water Stability of Asphalt Mixture Containing Phosphogypsum

作　　者：徐国浩 黄小梅 徐雄 XU Guohao;HUANG Xiaomei;XU Xiong(Ministry of Education Engineering Research Center for Phosphorus Resources Development and Utilization,Wuhan Institute of Technology,Wuhan,Hubei 430074,China;School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan,Hubei 430074,China;Hubei Provincial Engineering Research Center for Green Civil Engineering Materials and Structures,Wuhan,Hubei 430074,China)

机构地区：[1]武汉工程大学磷资源开发利用教育部工程研究中心,湖北武汉430074 [2]武汉工程大学土木工程与建筑学院,湖北武汉430074 [3]绿色土木工程材料与结构湖北省工程研究中心,湖北武汉430074

出　　处：《黑龙江交通科技》2025年第1期10-14,19,共6页Communications Science and Technology Heilongjiang

基　　金：磷资源开发利用教育部工程研究中心创新基金项目(LCX202204);武汉工程大学研究生教育创新基金研究项目(CX2023365)。

摘　　要：磷石膏(PG)是磷肥工厂生产磷酸过程中产生的固体废物,其随意排放堆积导致在云、贵和鄂等省境内产生了严重的环境问题。为研究PG应用于沥青路面的可行性,将PG梯级替换矿粉作为聚亚甲基多苯基异氰酸酯(PMDI)改性沥青混合料的填料,对其水敏感性进行了研究。研究结果表明,当PG替换矿粉比例为50%时,PMDI改性沥青混合料的浸水马歇尔残留稳定度(RMS)和冻融劈裂残留强度比(TSR)均达到最大值,分别为90.4%和87.4%,远高于规范要求;同时,在经过5次冻融循环后,其TSR值达到56.7%,说明PG替换率为50%的PMDI改性沥青混合料具有较好的长期耐水损害的能力。Phosphogypsum(PG)is a solid waste produced during phosphoric acid production in phosphate fertilizer plants.Its random disposals and accumulations have caused severe environmental problems in provinces such as Yunnan,Guizhou,and Hubei.In order to study the feasibility of applying PG to asphalt pavement,the water sensitivity of a PMDI modified asphalt mixture using PG step-replacement mineral powder as a substitute filler was investigated.The results show that when the PG replacement ratio is 50%,the maximum RMS and TSR of the PMDI modified asphalt mixtures is 90.4%and 87.4%,respectively,much higher than the standard requirements.At the same time,after five freeze-thaw cycles,its TSR value reached 56.7%,indicating that the PMDI modified asphalt mixture with a PG replacement rate of 50%has good long-term water damage resistance.

关 键 词：沥青路面 改性沥青混合料 磷石膏 替代填料 水稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]