摘要
针对碱激发材料存在抗碳化性能差等缺点,以及对碱激发材料的碳化研究手段还缺乏统一标准。提出了一种硬化混凝土粉末碳化测试方法,结合不同掺量的草木灰、氧化镁、乳酸钠、煅烧水滑石(C-HT)的碱激发矿渣-粉煤灰砂浆(AAM)的抗碳化性能进行研究。试验结果表明:添加草木灰时,AAM抗碳化性能下降,但随着其掺量增加,AAM抗碳化性能逐渐提高,掺量为6%时,AAM抗碳化性能与对照组相差较小;氧化镁、乳酸钠、C-HT均可提高AAM的抗碳化性能,添加6%氧化镁或6%C-HT的效果最明显;乳酸钠对于AAM抗碳化性能提高并不显著。硬化粉末碳化测试方法不仅用于测试AAM的抗碳化性能,而且可以利用碳化程度和速率对不同添加剂进行抗碳化性能的精确对比。
Alkali-activated materials are one of the environmentally friendly materials that are expected to replace cement,but they have disadvantages such as poor resistance to carbonation and there is a lack of unified standards for carbonation research methods for alkali-activated materials.This article proposes a method for testing the carbonation of hardened concrete powder,and studies the carbonation resistance of alkali-activated slag-fly ash mortar(AAM)containing different dosages of plant ash,MgO,Sodium lactate,and C-HT.The experimental results show that when adding plant ash,the carbonation resistance of AAM decreases.However,as the dosage of plant ash increases,the carbonation resistance of AAM gradually improves.When the dosage is 6%,the carbonation resistance of AAM is similar to that of the control group.MgO,Sodium lactate,and C-HT can all improve the carbonation resistance of AAM.The effect is most significant when adding 6%MgO or 6%C-HT.Sodium lactate does not significantly improve the carbonation resistance of AAM.The hardened powder carbonation testing method is not only used to test the carbonation resistance of AAM,but can also be used to accurately compare the carbonation resistance of different additives by measuring the degree and rate of carbonation.
作者
王洪全
范宏
牛宝乐
王祥
万小梅
WANG Hongquan;FAN Hong;NIU Baole;WANG Xiang;WAN Xiaomei(School of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266520,China)
出处
《河北工程大学学报（自然科学版）》
CAS
2024年第3期32-38,48,共8页
Journal of Hebei University of Engineering:Natural Science Edition
基金
国家自然科学基金面上项目(51878365)。
关键词
碳化程度
碳酸钙含量
粉末碳化
碱激发混凝土
碳化速率
carbonization extent
calcium carbonate content
powder carbonization
Alkali excites concrete
carbonization rate
