氢氧化钙对矿渣碱激发材料力学性能改善与凝结机理分析  

Improvement of mechanical properties of slag alkali-activated materials by calcium hydroxide and analysis of setting mechanism

作　　者：顾小娟[1] 韩文娟[1] 田小娟[1] GU Xiaojuan;HAN Wenjuan;TIAN Xiaojuan(School of Civil Engineering,Jianghai Polytechnic College,Yangzhou,Jiangsu 225101,China)

机构地区：[1]江海职业技术学院土木工程学院,江苏扬州225101

出　　处：《江苏建筑职业技术学院学报》2024年第3期31-38,共8页Journal Of Jiangsu Vocational Institute of Architectural Technology

摘　　要：为进一步增强矿渣碱激发材料力学性能,扩大其在工程中的应用范围,通过在矿渣中掺入不同比例的氢氧化钙进行增钙改性,研究对碱激发试件抗压强度的增强效果与凝结规律的影响。通过XRD与SEM微观分析,探究碱激发试件的矿物晶体组成与微观结构特征,并深入探讨增钙增强的作用机理。结果表明,氢氧化钙的掺入显著提高了碱激发试件的抗压强度,明显缩短了初凝与终凝时间。随着氢氧化钙掺量的增加,试件的抗压强度呈先提升后降低的趋势,10%掺量的改善效果最佳。因为活性钙参与聚合反应,致使水化产物生成量显著提升。然而氢氧化钙掺入过量时,矿渣掺量随之降低,引起活性硅与铝含量降低,水化产物的生成量减少,导致抗压强度下降。In order to further enhance the mechanical properties of slag alkali activated materials and expand their application scope in engineering,this paper studies the effect of adding different proportions of calcium hydroxide to slag for calcium modification,and investigates the effect of enhancing the compressive strength and setting law of alkali activated specimens.Through XRD and SEM microscopic analysis,explore the mineral crystal composition and microstructure characteristics of alkali excited specimens,and deeply explore the mechanism of calcium enhancement.The results showed that the addition of calcium hydroxide significantly improved the compressive strength of alkali activated specimens and significantly shortened the initial and final setting times.With the increase of calcium hydroxide content,the compressive strength of the specimen shows a trend of first increasing and then decreasing,and the best improvement effect is achieved with a 10%content.Due to the participation of active calcium in polymerization reactions,the amount of hydration products generated is significantly increased.When excessive calcium hydroxide is added,the slag content decreases,causing a decrease in the content of active silicon and aluminum,a decrease in the generation of hydration products,and a decrease in compressive strength.

关 键 词：碱激发 矿渣 氢氧化钙 抗压强度 凝结时间 

分 类 号：TU526[建筑科学—建筑技术科学]