Abstract
To reduce carbon emission of magnesium phosphate cement (MPC), improve its performance and promote the multiple utilization of brucite resources, magnesium phosphate cement was prepared by natural brucite (NB) instead of traditional dead-burned MgO (NBMPC), and modified by ultrafine metakaolin (UMK) and metakaolin (MK). The effects of varying UMK/MK on the properties and reaction of NBMPC were studied. The optimal combination, with 10 % UMK and 20 % MK, resulted in a 72 % reduction in carbon emissions. This combination achieved the fluidity of 155 mm, final setting time of 33 min, compressive strength of 60.49 MPa at 28 days, tensile bonding strength of 3.13 MPa at 28 days and interfacial flexural tensile strength of 9.56 MPa at 28 days. Microscopic analysis showed that UMK/MK did not change the types of reaction products, and influenced reaction degree of NB and pore structure. The findings indicate that modified NBMPC provides enhanced performance and environmental sustainability, making it a viable alternative to traditional MPC.
Published Version
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