Experimental design, mechanical performance and mechanism analysis of C30 phosphogypsum-based concrete

The present study aimed to increase the utilization of phosphogypsum and reduce cement consumption. Single-factor experiments were designed to the effects of water-cement ratio (0.45–0.30), silica fume (1 %∼7 %), cement dosage (0 %∼20 %), and the RPG/HPG (20/80–0/100) on mechanical properties of pho...

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Bibliographic Details
Published in:	Construction & building materials Vol. 443; p. 137673
Main Authors:	Hu, Ninggui, Kong, Dewen, Wang, Lingling, Zhou, Shenghui, Han, Yurui, Feng, Jinpeng, Shu, Jing, Liu, Ao, Ni, Wenhui, Khan, Nauman
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 13-09-2024
Subjects:	Constitutive model Elastic properties Mechanical properties Microscopic mechanism Phosphogypsum-based concrete C-S-H PGCM CBC RPG Mechanical properties Constitutive model XRD Microscopic mechanism Aft Phosphogypsum-based concrete PG SEM Elastic properties PGBC HPG
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Summary:	The present study aimed to increase the utilization of phosphogypsum and reduce cement consumption. Single-factor experiments were designed to the effects of water-cement ratio (0.45–0.30), silica fume (1 %∼7 %), cement dosage (0 %∼20 %), and the RPG/HPG (20/80–0/100) on mechanical properties of phosphogypsum-based concretes (PGBCs). A new phosphogypsum-based concrete was prepared to meet the compressive strength requirement of C30 grade. The maximum 28d compressive strength of this PGBC reached 45.1 MPa. Simultaneously, the effect mechanisms of above four factors on the mechanical properties of PGBCs were discussed by combining XRD and SEM results. Moreover, the volume stability, elastic parameters, and compressive constitutive model of this PGBC with compressive strength above 30 MPa were investigated. This PGBC used more than 80 % phosphogypsum and 10∼20 % cement, exhibiting well economy and environmental friendliness. Moreover, the constitutive model was established to well predict the compressive behavior of PGBC with different RPG/HPG relative ratios. This PGBC had better volume stability and weaker deformation resistance than cement-based concrete. The present results can provide more theoretical and technical supports for the large utilization of PG. •PGBC is prepared with a large amount of PG as a cementing material.•The effects of four facters on the strength of PGBC were discussed.•The strength formation mechanism of PGBC were discussed by XRD&SEM.•A damage constitutive model with good correlation coefficient was established.•Providing theoretical and technical supports for the efficient utilization of PG.
ISSN:	0950-0618
DOI:	10.1016/j.conbuildmat.2024.137673