大掺量矿物掺合料混凝土早期碳化特性及预测  

Carbonation Depth and Prediction of Concrete with High Volume Mineral Admixture

作　　者：陈健 温小栋 何余良 王赛赛 CHEN Jian;WEN Xiao-dong;HE Yu-liang;WANG Sai-sai(School of Civil Engineering,Shaoxing University,Shaoxing 312000,China;School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315211,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]绍兴文理学院土木工程学院,绍兴市312000 [2]宁波工程学院建筑与交通工程学院,宁波市315211 [3]华南理工大学亚热带建筑科学国家重点实验室,广州市510640

出　　处：《公路》2019年第12期230-235,共6页Highway

基　　金：国家自然科学基金，项目编号51569035;华南理工大学亚热带建筑科学国家重点实验室开放研究项目，项目编号2017ZB26

摘　　要：为了揭示大掺量矿物掺合料混凝土的早期碳化特性及准确预测其碳化深度,采用加速碳化试验方法,研究了水胶比,粉煤灰、矿粉及两者复合大掺量取代水泥对混凝土早期碳化深度的影响。在此基础上,考虑掺合料碳化速度的影响,提出大掺量矿物掺合料混凝土的早期碳化深度预测模型。结果表明:各碳化龄期与水胶比下,大掺量矿物掺合料混凝土的早期碳化深度大小取决于矿物掺合料掺量、种类以及其与水灰比之间的关系;矿粉对混凝土早期碳化性能的影响与粉煤灰类相似,但其早期抗碳化能力明显优于粉煤灰;与单掺矿物掺合料相比,粉煤灰与矿粉复掺可以缓和矿物掺合料混凝土早期抗碳化性能的下降;水胶比越小,矿物掺合料对混凝土早期抗碳性能的影响程度越小;最后,所建立的早期碳化模型预测结果与试验结果吻合良好,具有良好的工程适用性和指导意义。In order to understand the early carbonization characteristics of mineral admixture concrete and to precisely predict its carbonation depth,the effects of water binder ratio,cement replacement by fly ash or slag,and the combination of both on the carbonation depth of concrete containing mineral admixture are studied through accelerated carbonization test.Moreover,an early carbonation predictive model for concrete containing mineral admixture is proposed when considering the influence of mineral admixture on carbonation rate.The results show that the early carbonization depth of concrete containing mineral admixture depends on the mineral admixture type and content,and their relationship with water-binder ratio;the effect of slag on the early carbonation depth is similar to that of fly ash,while its early anticarbonation performance is more significant than fly ash concrete;in addition,replacement by both fly ash and slag can greatly improve the early anti-carbonation performance of concrete containing mineral admixture;the smaller the water binder ratio,the smaller the influence of mineral admixture on its early anti-carbonation performance.It can be seen from the experimental research that the predicted result of the model is in good agreement with the experiment,and it has excellent engineering applicability and instructive significance.

关 键 词：混凝土 碳化特性 矿物掺合料 碳化速度影响系数 早期碳化模型 

分 类 号：U414.03[交通运输工程—道路与铁道工程]