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Modification of Lime-Fly Ash-Crushed Stone with Phosphogypsum for Road Base
Advances in Civil Engineering ( IF 1.8 ) Pub Date : 2020-11-27 , DOI: 10.1155/2020/8820522 Hao Zhang 1 , Yuan Cheng 1 , Lei Yang 2 , Weikang Song 1
Advances in Civil Engineering ( IF 1.8 ) Pub Date : 2020-11-27 , DOI: 10.1155/2020/8820522 Hao Zhang 1 , Yuan Cheng 1 , Lei Yang 2 , Weikang Song 1
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In order to increase the recycling of phosphogypsum waste, this study explored the feasibility of using phosphogypsum to replace some of the lime and aggregate in the lime-fly ash-crushed stone mixture which is a widely used road base material in China. For this purpose, compaction, compressive strength, composition structures, wetting-drying cycle tests, and shrinkage tests were carried out on the lime-fly ash-phosphogypsum-crushed stone composite to investigate its performance. The results indicate that lime-fly ash-crushed stone modified with phosphogypsum has the required strength of the road base material and favourable performances in environment (wetting-drying cycle) stability. The image processing analysis and shrinkage tests demonstrated that phosphogypsum can significantly improve the compactness and shrinkage performance of lime-fly ash-crushed stone mixture. A suitable content of phosphogypsum and a reasonable content of fine aggregate are conducive to improving the roadway engineering properties (i.e., decreasing shrinkage cracks and increasing compressive strength) of lime-fly ash-phosphogypsum-crushed stone composites.
更新日期：2020-11-27
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