Fabrication of sustainable magnesium phosphate cement micromortar using design of experiments statistical modelling: Valorization of ceramic-stone-porcelain containing waste as filler. Issue 8 (15th April 2021)

• Record Type: Journal Article
• Authors: Huete-Hernández, S.; Maldonado-Alameda, A.; Giro-Paloma, J.; Chimenos, J.M.; Formosa, J.
• Is Part Of: Ceramics international. Volume 47:Issue 8(2021)
• Page Start: 10905
• Page End: 10917
• Publication Date: 2021-04-15
• Subjects: Microstructure-final -- Mechanical properties -- MgO -- Structural applications -- Design of experiments; MPC Magnesium Phosphate Cement -- LG Low-Grade. Refers to a product containing impurities and of lower quality than the pure product -- LG-MgO Low-grade MgO. MgO containing impurities and of lower quality than pure MgO -- Sust-MPC Sustainable Magnesium Phosphate Cement -- CSP Ceramic, Stone, and Porcelain Waste -- DoE Design of Experiments -- CBC Chemically Bonded Ceramics -- CBPC Chemically Bonded Phosphate Cements -- MKP Monopotassium Phosphate -- RSM Response Surface Methodology -- CSP(%) Ceramic, Stone, and Porcelain Waste percentage in the micromortar -- R1-16 Micromortar formulation from the corresponding design of experiments run -- -7d, −28d, −365d Number of days of curing before testing and characterization; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.12.210
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Magnesium phosphate cement (MPC) is a potential sustainable alternative to Portland cement. It is possible to lower the total CO2 emissions related to MPC manufacturing by using by-products and wastes as raw materials. When by-products are used to develop MPC, the resultant binder can be referred to as sustainable magnesium phosphate cement (sust-MPC). This research incorporates ceramic, stone, and porcelain waste (CSP) as a filler in sust-MPC to obtain a micromortar. Sust-MPC is formulated with KH2 PO4 and low-grade MgO (LG-MgO), a by-product composed of 40–60 wt% MgO. CSP is the non-recyclable glass fraction generated by the glass recycling industry. The effect of water and CSP addition on the mechanical properties of sust-MPC was analyzed using design of experiments (DoE). A statistical model was obtained and validated by testing ideally formulated samples achieved through optimization of the DoE. The optimal formulation (15 wt% of CSP and a water to cement ratio of 0.34) was realized by maximizing the compressive strength at 7 and 28 days of curing, resulting in values of 18 and 25 MPa respectively. After one year of curing, the micromortar was physico-chemically characterized in-depth using backscattered scanning electron microscopy (BSEM-EDS) and Fourier transform infrared-attenuated total reflectance spectroscopy (FTIR-ATR). The optimal formulation showed good integration of CSP particles in the ceramic matrix. Thus, a potential reaction between silica and the K-struvite matrix may have occurred after one year of curing.