磷酸镁水泥基帆布力学与微观性能研究  

Study on Mechanical and Microscopic Properties of Magnesium Phosphate Cement-based Canvas

作　　者：刘雄飞 王楠 郝逸飞 李辉 LIU Xiongfei;WANG Nan;HAO Yifei;LI Hui(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China;Engineering Research Center on Construction 3D Printing of Hebei,Tianjin 300401,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]建筑3D打印河北省工程研究中心,天津300401

出　　处：《材料导报》2024年第17期7-12,共6页Materials Reports

基　　金：国家自然科学基金(52278252,52078181);河北省自然科学基金(E2023202258)。

摘　　要：基于磷酸镁水泥(MPC)快硬早强和高粘结特性,研发了应急防护型MPC帆布。研究了不同镁磷物质的量比(M/P=3~8)和水灰比(W/C=0.15~0.5)对MPC帆布抗压和抗弯强度的影响规律,并结合XRD、SEM和X-CT分析MPC在帆布中的水化反应形貌、产物和孔结构变化规律,提出MPC帆布优化设计方法。实验结果表明:M/P显著影响MPC帆布的力学性能,M/P为6时,MPC帆布在28 d龄期的抗压和抗弯强度分别达到最佳值26.65 MPa和6.20 MPa。W/C决定MPC在帆布中的水化程度,低或过高的W/C均无法保证MPC在帆布中的整体性,MPC帆布的最佳W/C为0.35,在该条件下,MPC帆布在28 d龄期的抗压和抗弯强度分别达到最高值26.90 MPa和6.30 MPa,MPC水化产物(K-鸟粪石)最多且MPC与帆布纤维界面粘结密实,孔隙率最小(7.63%),MPC帆布整体性达到最佳。A new type of emergency protection material of MPC canvas was developed based on the characteristics of magnesium phosphate cement(MPC),fast hardening,high early strength,and excellent bonding strength.The effects of magnesium/phosphate molar ratio(M/P=3-8)and water-cement ratio(W/C=0.15-0.5)on the compressive and flexural strengths of MPC canvas were studied.The hydration morphology,product,and pore structure of MPC in canvas were analyzed by XRD,SEM,and X-CT,respectively.The optimization design method of MPC canvas was proposed.The experimental results showed that M/P significantly affected the mechanical properties of MPC canvas.When the molar ratio of M/P was 6,the compressive and flexural strengths of the MPC canvas reached the highest values of 26.65 MPa and 6.20 MPa at 28 d of age,respectively.W/C determined the hydration degree of MPC in canvas.Low or excessive W/C cannot ensure the integrity of MPC in canvas.0.35 was the optimum W/C for MPC canvas,the compressive and flexural strengths of the MPC canvas reached the highest values of 26.90 MPa and 6.30 MPa at 28 d of age.The hydration products(K-struvite)reached the maximum content,and the interface between MPC and canvas fabric was compact.The porosity reached the minimum value of 7.63%,and the integrity of the MPC canvas was the optimum.

关 键 词：混凝土帆布 磷酸镁水泥 力学性能 水化过程 

分 类 号：TU525.9[建筑科学—建筑技术科学]