磷镁物质的量比对天然水镁石制备的磷酸镁水泥性能的影响  

Effect of Molar Ratio of Phosphate to Magnesium on Properties of Magnesium Phosphate Cement Prepared by Natural Brucite

作　　者：李悦[1] 龙世儒 王子赓 王楠[1] LI Yue;LONG Shiru;WANG Zigeng;WANG Nan Beijing(Key Laboratory of Earthquake Engineering and Structural Retrofit,Key Laboratory of Urban Security and Disaster Engineering,MOE,Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,城市与工程安全减灾教育部重点实验室,工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《材料导报》2024年第17期1-6,共6页Materials Reports

基　　金：国家重点研发计划(2022YFC3803103);国家自然科学基金(52108188);绿色建筑材料国家重点实验室开放基金(2022GBM10);中国水利水电科学研究院水利部水工程材料重点实验室(筹)开放研究基金(EMF202407)。

摘　　要：本工作采用无需煅烧的天然水镁石作为镁质原料制备磷酸镁水泥(MPC),主要研究了磷镁物质的量比(P/M)对MPC工作性能、力学性能、物相组成及微观形貌的影响规律。结果表明:随P/M减小,MPC浆体流动度逐渐减小,凝结时间逐渐延长,抗压强度先提高后降低。P/M为1/4时,MPC综合性能较优,此时流动度为110 mm,凝结时间为7 min,1 d和28 d抗压强度分别为20.0 MPa和43.7 MPa。微观试验结果表明,MPC水化产物为MgKPO_(4)·6H_(2)O、Ca_(10)(OH)_(2)(PO_(4))_(2)。MPC水化28 d后,水镁石未完全反应。随着P/M减小,硬化体结构密实度增加,总孔隙率减小。In this work,magnesium phosphate cement(MPC)was prepared by natural brucite without calcination.The influence of molar ratio of phosphate to magnesium(P/M)on the workability,mechanical properties,phase compositions and microstructure of the MPC was mainly investigated.The results showed that with the decrease of P/M,the fluidity of the MPC paste decreased gradually,the setting time extended,and the compressive strength increased first and then decreased.When the P/M was 1/4,the comprehensive performance of MPC was promising,which the fluidity was 110 mm,the setting time was 7 min,and the 1 d and 28 d compressive strengths were 20.0 MPa and 43.7 MPa,respectively.The microscopic test results showed that the hydration products of the MPC were MgKPO_(4)·6H_(2)O and Ca_(10)(OH)_(2)(PO_(4))_(2).After 28 d hydration reaction of the MPC,brucite did not completely reacted.With the decrease of P/M,the structural compactness of hardened matrix increased,the total porosity decreased.

关 键 词：水镁石 磷酸镁水泥 P/M 宏观性能 水化产物 

分 类 号：TU528.59[建筑科学—建筑技术科学]