摘要
研究了乙二胺四乙酸二钾(EDTA-2K)对磷酸钾镁水泥(MKPC)工作性能、力学性能以及微观结构的影响,分析了其影响机理。结果表明,随着EDTA-2K掺量的增加,MKPC的凝结时间明显延长,抗压强度先提高后降低,EDTA-2K掺量为2%时,MKPC的28 d抗压强度达到最高;XRD分析表明,MKPC表面析出的物质为磷酸二氢钾和无定形物质,EDTA-2K能够显著抑制MKPC的表面泛霜现象,MKPC表面析出物显著减少甚至不再析出,其原因可能是EDTA-2K改善了磷酸二氢钾溶液的稳定性,提高了MKPC的水化程度,改善了MKPC水化产物的形貌,提高了水化产物的密实程度。
The effect of dipotassium ethylene diamine tetraacetate(EDTA-2K)on the working performance,mechanical properties and microstructure of potassium magnesium phosphate cement(MKPC)was studied,and its influence mechanism was analyzed.The results show that as the content of EDTA-2K increases,the setting time of MKPC is significantly prolonged,while the compressive strength of MKPC first increases and then decreases.When the content of EDTA-2K is 2%,the 28 d compressive strength of MKPC reaches the highest.X-ray diffraction(XRD)analysis shows that the precipitated substances on the surface of MKPC are potassium dihydrogen phosphate and amorphous substances.EDTA-2K can significantly inhibit the surface efflorescence phenomenon of MKPC,and the precipitates on the surface of MKPC are significantly reduced or even no longer precipitated.The reason may be that EDTA-2K improved the stability of potassium dihydrogen phosphate solution,increased the degree of hydration of MKPC,improved the morphology of MKPC hydrated products,and increased the degree of compaction of hydrated products.
作者
任建国
张鑫
刘巧玲
姜俊玮
REN Jianguo;ZHANG Xin;LIU Qiaoling;JIANG Junwei(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering of Ministry of Education,Jinan 250101,China)
出处
《新型建筑材料》
2021年第12期133-137,共5页
New Building Materials
基金
国家自然科学基金重点项目(52038006)
国家自然科学基金项目(52078282)。
关键词
乙二胺四乙酸二钾
磷酸钾镁水泥
性能
泛霜
水化程度
EDTA-2K
potassium magnesium phosphate cement
property
efflorescence
hydration degree
