低温磷酸镁水泥混凝土的力学性能  

Strength properties of low temperature magnesium phosphate cement concrete

作　　者：李茂 岳燕飞[2] 钱觉时[2] 李振 唐茂华 LI Mao;YUE Yanfei;QIAN Jueshi;LI Zhen;TANG Maohua(Research and Development Center of Transport Industry of Technologies,Materials and Equipments of Highway Construction and Maintenance,Gansu Road&Bridge Construction Group,Lanzhou 730030,P.R.China.;School of Materials Science and Engineering,Chongqing University,Chongqing 400045,P.R.China)

机构地区：[1]甘肃路桥建设集团有限公司公路建设与养护技术、材料及装备交通运输行业研发中心,兰州730030 [2]重庆大学材料科学与工程学院,重庆400045

出　　处：《土木与环境工程学报（中英文）》2023年第2期194-202,共9页Journal of Civil and Environmental Engineering

基　　金：公路建设与养护技术、材料及装备交通运输行业研发中心(甘肃路桥建设集团有限公司)开放基金(GLKF201805)。

摘　　要：基于响应曲面法设计试验,研究不同环境温度(0、-20℃)下水胶比(W/C)、集胶比(G/C)、氧化镁与磷酸盐质量比(M/P)对磷酸镁水泥(MPC)混凝土抗压强度和抗折强度的影响。使用Design-Expert软件对数据进行分析处理,得到的回归模型反映了3个因素对低温环境下MPC混凝土力学性能的影响规律。3个因素对低温环境下混凝土强度的影响程度为:W/C>M/P>G/C,MPC混凝土抗压强度和抗折强度随W/C的增大而降低。-20℃环境下MPC混凝土抗压强度和抗折强度随G/C的增大而降低,随M/P的增大而增大;0℃环境下抗压强度随G/C的增大而增大,随M/P的增大而降低;抗折强度随G/C的增大而降低,随M/P的增大而降低。-20℃环境温度下MPC混凝土7 d抗压强度和抗折强度在W/C为0.14、M/P为5.0、G/C为2.0时达到最大值。0℃环境温度下MPC混凝土7 d抗压强度在W/C为0.14、M/P为3.0、G/C为3.0时达到最大值;7 d抗折强度在W/C为0.14、M/P为3.0、G/C为2.0时达到最大值。模型预测强度值与试验实际强度值之间偏差不超过10%,模型显著性良好。By employing response surface methodology(RSM),the influence of three factors,i.e.water-binder ratio(M/C),aggregate ratio(G/C)and the mass ratio of magnesium oxide to phosphate(M/P),at different temperatures(0,-20℃)on the compressive strength and flexural strength of magnesium phosphate cement concrete was investigated.By using Design-Expert software to analyze data,the regression model was obtained,which reflects the influence of three factors on the mechanical properties of MPC concrete at different environmental temperatures.The degree of influence of these three factors on the concrete strength under low temperature was:W/C>M/P>G/C.The compressive strength and flexural strength of MPC concrete decreased with the increase of W/C.The compressive strength and flexural strength of MPC concrete decreased with the increase of G/C,increased with the increase of M/P at -20℃.The compressive strength increased with the increase of G/C,decreased with the increase of M/P at 0℃;The flexural strength decreased with the increase of G/C,decreased with the increase of M/P at 0℃.The 7 d compressive strength and flexural strength of MPC concrete at -20℃ showed its maximum value at W/C=0.14,M/P=5.0,and G/C=2.0,whilst the 7 d compressive strength of MPC concrete at 0℃ reached its maximum value at W/C=0.14,M/P=3.0,and G/C=3.0;the 7 d flexural strength of MPC concrete at 0℃ reached its maximum value at W/C=0.14,M/P=3.0,and G/C=2.0.The deviation between the predicted strength of the model and the actual value of the test was less than 10%,confirming the good significance of the model established.

关 键 词：磷酸镁水泥混凝土 响应曲面法 低温环境 力学性能 

分 类 号：TU528.1[建筑科学—建筑技术科学]