路基用改性磷石膏复合材料性能研究

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码：A 文章编号：1005-8249（2025）04-0046-05

DOI：10.19860/j.cnki.issn1005-8249.2025.04.009

YANG Hongquan，LIU Zhengxiong， SUN Guili，GUO Wei，HUANG Shunwen，KAN Tao（Southwest Transportation Construction Group Co.，Ltd.，Kunming 65OOOO，China）

Abstract：Inorderto improve theutlization eficiencyof phosphogypsum，modified phosphogypsum was prepared byusing carbide slag，quicklime，anddispersant as modifiers，andcombined with slag powder，cement，andcuring agent to prepare modifidphosphogypsumcompositematerialssuitableforhighwaysubgradeenginering.Thecomprehensiveperformanceof modified phosphogypsumcomposite materials was evaluatedthrough unconfined compresive strength，direct shear，immrsion， wetdrycycle，freeze-thawcycle，and heavy metalleachingtoxicitytests.Theresultsshowthat when the dosage of modified phosphogypsum was 15% ，the unconfined compressve strength，internal friction angle，and cohesion of the composite material were15.2 MPa， 30.4∘ ，and 186.3kPa ，respectively，the softening coefficient was O.94，indicating good mechanical and waterresistanceproperties；Whenthe numberof wetdrycycles is4Oorthe numberoffreeze-thawcycles is8O，theunconfined compressivestrength valueof modified phosphogypsumcompositematerialcanstillmeetthe strength standardrequirementsof highwaysubgradematerialsandhasgooddurabilityperformance；Theleaching toxicityofheavymetalsinmodified phosphogypsumcomposite materials isrelativelylow，andtheenvironmentalperformanceisgood，providesomereferenceand inspiration for the efficient resource utilization of waste phosphogypsum.

Keywords：expressway；roadbed engineeing；modified phosphogypsum；durabilitypeformance；environmentalperformance

0 引言

目前磷石膏的利用率仍相对较低，大量堆积的磷石膏不仅会造成土地资源的浪费，还可能对周围土壤、空气、地下水以及生态环境造成严重的污染[1-2]。（剩余5527字）