Work

Modification of Lime‐Fly Ash‐Crushed Stone with Phosphogypsum for Road Base

Year: 2020

Type: article

Abstract: 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.

Source: Advances in Civil Engineering

DOI: 10.1155/2020/8820522

Authors: Hao Zhang, Yuan Cheng, Lei Yang, Weikang Song

Institutions: Zhengzhou University, Henan Information and Statistics Vocational College

Language: English

Topic: Geotechnical and construction materials studies

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Industry, innovation and infrastructure, Sustainable cities and communities

Open Access status: gold

Estimated APC paid: $2,760