加速碳化条件下界面过渡区的纳米力学性能  

Nanomechanical properties of interfacial transition zone under accelerated carbonation

作　　者：沈奇真[1] 潘钢华[1,2] 占华刚 李焦 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省土木工程材料重点实验室,南京211189

出　　处：《东南大学学报（自然科学版）》2016年第1期146-151,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51178103)

摘　　要：为了研究界面过渡区(ITZ)对碳化速率的影响,采用纳米压痕技术研究了不同水胶比试件碳化前后界面过渡区的纳米力学性能演化规律.结果表明,当水胶比λ=0.53和0.35时,试件界面过渡区的平均弹性模量分别由碳化前的29.08和33.21 GPa增加到碳化后的43.72和41.74 GPa,而当λ=0.23时试件碳化后界面过渡区的平均弹性模量则有所降低.同时,各试件界面过渡区的平均硬度在碳化后均有所增大,界面过渡区的尺寸则有所减小.因此,在加速碳化条件下,不同水胶比试件界面过渡区的纳米力学性能存在较大差异,且当λ=0.53时碳化对界面过渡区纳米力学性能的影响最显著.In order to study the influence of the interfacial transition zone（ ITZ） on the carbonation rate,the nanomechanical property evolution of the ITZ of specimens with different water-cement ratios,both before and after carbonation,is investigated by using nanoindentation technique. The results showthat after carbonation,the average elasticity modulus of the ITZ of the specimens with the water-binder ratio λ of 0. 53 and 0. 35 increase from 29. 08 and 33. 21 GPa to 43. 72 and 41. 74 GPa,respectively,while that of the specimen with λ = 0. 23 decreases. Meanwhile,after carbonation,the average hardness of each specimen increases but the size of the ITZ decreases. Therefore,under the accelerated carbonation condition,the nanomechanical properties of the ITZ of specimens with different water-cement ratios are distant,and the influence of carbonation on the nanomechanical properties of the ITZ is the most significant when λ = 0. 53.

关 键 词：水泥基材料 界面过渡区 碳化 纳米力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]