摘要
轻骨料混凝土具有收缩较大和渗透性较差的特性,矿物掺合料的加入可以改善轻骨料混凝土的性能。将偏高岭土(MK)和矿渣(S)以低于25%的总掺量复掺到轻骨料混凝土中,研究复掺掺合料及不同掺量对轻骨料混凝土的力学性能、氯离子扩散系数和干燥收缩的影响。利用XRD、TG、SEM等测试方法,对其影响机理进行探讨。结果表明,复掺10wt%偏高岭土与10wt%矿渣对轻骨料混凝土力学性能和抗氯离子渗透性能有显著的改善;复掺10wt%偏高岭土和15wt%偏高岭土能有效降低轻骨料混凝土干燥收缩。偏高岭土复合矿渣能优化水泥浆体的组成与结构,增强骨料与水泥浆体间的结合,降低界面过渡区的钙硅质量比,从而提高轻骨料混凝土各龄期抗压强度的抗渗性能。
With the large shrinkage and poor permeability of lightweight concrete,the addition of mineral admixture can improve the performance of lightweight concrete. The effects of metakaolin（ MK） and slag（ S） compositemixed on permeability of compressive strength,chloride diffusion coefficient and drying shrinkage of lightweight concrete,where the content of MK and S mixture was below 25% by weight and different admixture have been investigated. XRD,TG analysis and SEM testswere used to study the mechanism. The experimental results show that the compressive strength and permeability resistance to chloride ion of lightweight concrete significantly increase with incorporation of 10% MK and 10% S,the drying shrinkage of lightweight concrete decrease effectively with incorporation of 10% MK and 15% S,respectively. MK and S mixtures improve the compressive strength at 3,7 and 28 d and reduce the mass Ca to Siratioof interfacial transition zone,which optimize the composition,structure and enhance the combination between aggregate and cement paste.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第5期1349-1355,共7页
Bulletin of the Chinese Ceramic Society
基金
"扬帆计划"引进创新创业团队专项资助(201312C12)
国家科技支撑计划课题(2014BAC01B02)
关键词
轻骨料
偏高岭土
氯离子扩散系数
界面过渡区
lightweight aggregate
metakaolin
chloride diffusion coefficient
interfacial transition zone
