磷酸镁水泥砂浆抗压强度敏感性因素研究  

Investigation of Factors Influencing the Compressive Strength of Magnesium Phosphate Cement Mortars

作　　者：李翔[1] 郭伊璐 张自立[1] 孟鑫淼 冀晓东[2] LI Xiang;GUO Yilu;ZHANG Zili;MENG Xinmiao;JI Xiaodong(School of Civil Engineering,Tongji University,Shanghai 200092,China;Department of Civil Engineering,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]北京林业大学土木工程系,北京100083

出　　处：《工业建筑》2024年第9期185-190,共6页Industrial Construction

摘　　要：磷酸镁水泥作为一种生态友好型胶凝材料,具有快硬早强、收缩性良好、黏结性能优异、抗腐蚀性强、耐磨抗冻等诸多特点,在工程领域的应用前景十分广阔。本文重点考察了磷酸盐类型、粉煤灰掺量、水灰比和养护龄期等因素对磷酸镁水泥砂浆(MPCM)抗压强度的影响。试验结果表明:不添加粉煤灰时,相比于单独使用磷酸二氢铵或磷酸二氢钾,按质量比1∶1混合使用两种磷酸盐制备的MPCM,其早期抗压强度得到了显著的提升;按20%的水泥凝胶质量掺入粉煤灰有助于提升使用磷酸二氢钾或混合磷酸盐的MPCM的1 d抗压强度,而对它们的28 d抗压强度具有潜在的不利影响;水灰比的降低(0.25到0.20)和龄期的增加(1 d到28 d)对MPCM抗压强度的提升都具有积极作用。Magnesium phosphate cement,recognized for its environmental sustainability,boasts attributes such as rapid setting,high early strength,low shrinkage,exceptional bond performance,robust corrosion resistance,and resilience against wear and freezing.These distinctive properties position it as a promising material for diverse applications in civil engineering.This study aims to explore the influence of various factors,including phosphate type,fly ash content,water-to-binder ratio,and curing age,on the compressive strength of magnesium phosphate cement mortar(MPCM).Experimental findings revealed that in the absence of fly ash,the utilization of a 1∶1 mass ratio blend of two phosphate salts led to a notable enhancement in the early compressive strength of MPCM compared to the individual application of either ammonium dihydrogen phosphate or potassium dihydrogen phosphate.Moreover,the addition of 20%fly ash by mass of cementitious material enhanced the 1-day compressive strength of MPCM formulated with potassium dihydrogen phosphate or a combination of phosphate salts,although it might potentially compromise the strength at 28 days.Generally,the reduction in the water-to-binder ratio from 0.25 to 0.20 and the extension of curing age from 1 day to 28 days exhibited favorable impacts on the compressive strength of MPCM.

关 键 词：磷酸镁水泥砂浆 抗压强度 磷酸盐类型 粉煤灰掺量 水灰比 

分 类 号：TQ177.62[化学工程—硅酸盐工业]