响应面法优化石灰石粉改性磷酸镁水泥抗压强度及机理  

Optimization of compressive strength and mechanism of limestone powder modified MPC using response surface methodology

作　　者：蒋晚晚 朱金才 孟晓凯[3] 王湘君 JIANG Wanwan;ZHU Jincai;MENG Xiaokai;WANG Xiangjun(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of Green Construction and Intelligent Operation and Maintenance of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Sciences,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051 [2]内蒙古工业大学内蒙古自治区土木工程绿色建造与智能运维重点实验室,内蒙古呼和浩特010051 [3]内蒙古工业大学理学院,内蒙古呼和浩特010051

出　　处：《新型建筑材料》2025年第1期51-55,128,共6页New Building Materials

基　　金：国家自然科学基金项目(52168031);内蒙古自然科学基金项目(2024MS05056,2022QN01007);内蒙古自治区直属高校基本科研业务费项目(JY20220152,JY20220222);内蒙古工业大学科学研究项目(BS201944)。

摘　　要：基于响应面法对石灰石粉改性磷酸镁水泥(MPC)配合比和力学性能进行优化,通过微观表征分析强度的影响机理。结果表明,抗压强度的因素影响顺序:镁磷比>石灰石粉掺量>水胶比,最优配合比:镁磷比为3,水胶比为0.163,石灰石粉掺量为7.018%,预测抗压强度为55.87 MPa。实测值与预测值之间的绝对相对偏差为2.65%,模型显著性良好,可用于预测石灰石粉改性MPC抗压强度。掺入石灰石粉后MPC中未产生新的水化矿物晶体相,石灰石粉增加了MgKPO_(4)·6H_(2)O的绝对质量分数,提高了MgKPO_(4)·6H_(2)O的结晶程度,晶体形貌更饱满,排列更加紧密,石灰石粉与氧化镁在MPC中起到了填充、充实的作用,MPC结构趋于致密。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 compressive strength in limestone powder-modified MPC.Incorporation of limestone powder does not introduce new hydration mineral crystal phases in MPC.Instead,it increases the absolute mass fraction of MgKPO_(4)·6H_(2)O,enhances the crystallinity of MgKPO_(4)·6H_(2)O,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.

关 键 词：磷酸镁水泥(MPC) 石灰石粉 响应面法 微观机理 

分 类 号：TU525.9[建筑科学—建筑技术科学]