The Effect of EMR on the Early Microstructure of Polymer Magnesium Phosphate Cement Composites Based on NMR

Abstract

We considered adding different amounts (1%, 2%, 3%, and 4%) of EMR to prepare manganese residue polymer magnesium phosphate cement composite (EMR-PMPC). The influence mechanism of EMR doping on the early macroscopic and microscopic pore structure properties of composites was studied by combining macroscopic and microscopic testing methods. The experimental results show that the addition of EMR can improve the working performance of the slurry and enhance the strength in the later stage, the 28 d compressive strength value of the slurry doped with EMR can reach 49.5 MPa. The Mn element and NH₄⁺-N in EMR react with MgO in the raw material to produce Struvite and Mn(OH)₂ and Mn₃(PO₄)·6H₂O gel, the hydration products coexist with each other and lap each other to form a dense microfine structure and effectively refine the pores. The hydration process consists of five stages, mainly concentrated in the first 10 h or less to exothermic mainly, infrared spectral absorption band is mainly composed of O-H bond, H-O-H bond, PO₄ bond and metal oxygen bond 3 parts, EMR makes the wave number of the absorption band from the ground wave number to the high wave number. EMR doping T₂ spectral relaxation time will lag behind, the pore size distribution changes. The total porosity and bound fluid saturation decrease with increasing, the free fluid saturation shows the opposite trend, the permeability decreases and then increases.

Keywords

electrolytic manganese residue / physical and mechanical properties / microscopic pore structure / T₂ spectra / pore structure parameters

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