Journal
JOURNAL OF CLEANER PRODUCTION
Volume 261, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2020.121268
Keywords
Magnesium phosphate cement; Phosphogypsum; Water resistance coefficient; Mechanical strength; Microstructure
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Funding
- National Natural Science Foundation of China [51778363, 51972209]
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The current study aimed to utilize the Phosphogypsum (PG) as a mixing ingredient in the magnesium phosphate cement (MPC) matrix and the influence of PG on the physical, mechanical and microstructural properties were explored over the courses of age. For judging the well interactions between the PG and MPC, consecutive dosages such 10%-40%, 60% and 80% PG were introduced as the substitution of very fine aggregate. The analytical results revealed the progress of density and decline of inner void spaces of the solid specimens with the higher amounts of PG. Mechanical strength pointedly enriched for the inclusion of PG up to 40% and obtained the compressive strength and flexural strength more than 75 MPa and 12 MPa, respectively at 28d in air, which were above 90% of control samples. The mass losses were noticed around 2% at 28d curing age. Microstructural properties analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD) demonstrated the well formation of calcium silicate hydrate (CSH), ettringite and some intermediate minerals along with the main struvite crystal, which developed the structural integrity of matrices. The Fourier Transform Infrared spectroscopy (FTIR) analysis also confirmed the existence of new chemical groups in MPC with PG content that indicated the presence of CSH and ettringite. The outcomes of the current research can be a promising solution to reuse PG as an ingredient in the MPC compounds as well as reduce the environmental concern. (C) 2020 Elsevier Ltd. All rights reserved.
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