Addition of Glass Powder to Magnesium Potassium Phosphate Cement Based on MgO Brick

Waste management is one of the most important factors in environmental protection. In the field of building, the reuse of bulk solid waste may have a great potential for the production of eco-friendly cementitious materials. The objective of this research is to assess the possibility of replacing magnesia with an admixture of magnesium bricks waste and glass powder in the preparation of magnesium potassium phosphate cement (MKPC). The MKPC mortars were produced by introducing different quantities of glass powder (0%–40% by weight). The impact of reusing waste glass material on the characteristics of the cement binder was investigated. Phase composition was evaluated using X-ray diffraction (XRD) and Fourier transform infrared (FTIR), together with differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The result shows that the addition of glass powder decreased the bulk density, thereby contributing to the lightness of pastes. Replacing dead burned MgO with waste promotes the main hydrate phase (K-struvite) formation. Compressive and tensile strengths of 47 and 6.07 MPa, respectively, were obtained for the sample containing 10% by weight of glass powder. The properties of the hydration products were improved with a decrease in the waste brick/phosphate ratio. The results indicate that these types of cement can be utilized as a low-cost alternative in the field of civil engineering.