Optimization of compressive strength and mechanism of limestone powder modified MPC using response surface methodology
JIANG Wanwan
ZHU Jincai
MENG Xiaokai
WANG Xiangjun
Abstract：This study employs response surface methodology to optimize the mix ratio and mechanical properties of limestone powder-modified MPC.The study further analyzes the mechanisms affecting strength through microscopic characterization.Results indicate that the order of influence on compressive strength is as follows:M/P＞LP/C＞W/B.The optimal mix ratio is identified as M/P=3,W/B=0.163,and LP/C=7.018％,with a predicted compressive strength of 55.87 MPa.The absolute relative deviation between the actual test values and predicted values is 2.65％,demonstrating the model's good significance and suitability for predicting compres-sive strength in limestone powder-modified MPC.Incorporation of limestone powder does not introduce new hydration mineral crys-tal phases in MPC.Instead,it increases the absolute mass fraction of MgKPO4·6H2O,enhances the crystallinity of MgKPO4·6H2O,and leads to fuller crystal morphology with more compact crystal arrangement.Limestone powder and magnesium oxide function as fillers in MPC,contributing to a denser structure of the material.
Keywords：magnesium phosphate cement(MPC)limestone powderresponse surface methodologymicro-mechanisms
Publication Date：2025-01-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)