Properties and Mechanisms of Limestone Powder Blended Magnesium Phosphate Cement under High Temperature
JIANG Wanwan
ZHU Jincai
MENG Xiaokai
WANG Xiangjun
Abstract：To expand the application of magnesium phosphate cement(MPC)in high-temperature environments,the properties and mechanisms of limestone powder blended magnesium phosphate cement(LP-MPC)after exposure to high temperature were investigated.The results indicate that as the temperature increases,the mass loss rate of LP-MPC gradually rises,while the compressive strength exhibits an initial decline followed by a stabilization trend,accompanied by a deterioration in pore structure characteristics.Below 600℃,dehydration of MgKPO4·6H2O dominates in LP-MPC,and LP is beneficial for enhancing the compressive strength of MPC.However,above 600℃,CaCO3 undergoes decomposition at high temperature,leading to an increased mass loss rate and a decrease in compressive strength as LP content increases.Both temperature and LP content significantly affect the deterioration of pore structure.After high temperature exposure,the complexity of pore structure in LP-MPC decreases with rising temperature within the same fractal region,and the fractal dimension of detrimental and highly detrimental pores correlate more closely with compressive strength.
Keywords：magnesium phosphate cementlimestone powderhigh temperaturecompressive strengthpore structure
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 499-507 )