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
李翔 1郭伊璐 1张自立 1孟鑫淼 2冀晓东2
作者信息
- 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
- 折叠
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28d)对MPCM抗压强度的提升都具有积极作用.
Abstract
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 fac-tors,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 ab-sence of fly ash,the utilization of a 1∶1 mass ratio blend of two phosphate salts led to a notable enhance-ment 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 di-hydrogen 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 exten-sion 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Key words
magnesium phosphate cement mortar/compressive strength/phosphate type/fly ash content/water-cement ratio引用本文复制引用
出版年
2024
NETL
NSTL
万方数据