Carbonation resistance of fly ash and blast furnace slag based geopolymer concrete
Carbonation resistance of fly ash and blast furnace slag based geopolymer concrete
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DOI：
10.1016/j.conbuildmat.2017.12.127
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发表时间：
2018-02-28
影响因子：
7.4
通讯作者：
Li, Sha
中科院分区：
文献类型：
--
作者：
Li, Zhuguo;Li, Sha
为了使地质聚合物（GP）在钢筋混凝土中得到实际应用，必须明确GP混凝土的抗碳化性能。通过加速碳化试验，研究了以粉煤灰（FA）和磨细高炉矿渣（BFS）为铝硅酸盐材料的不同GP混凝土和GP砂浆在不同碳化时间下的碳化深度。根据实验结果和理论分析，进一步研究了碳化深度与时间的关系。提出了一种根函数来描述粉煤灰-矿渣基GP混凝土的碳化速率。最后，通过碳化速率系数的比较，探讨了影响粉煤灰和矿渣微粉GP混凝土抗碳化性能的因素。主要结论是：常温养护的粉煤灰、矿渣基GP混凝土的抗碳化性能低于普通波特兰水泥（OPC）混凝土。随着活性填料（AF）中BFS比例、活性激发剂溶液（AS）中NaOH含量、BFS细度的增加，或AS/AF比例、水/AF比例的减小，抗碳化性能提高。加热养护和掺加缓凝剂有利于粉煤灰和矿渣基GP混凝土的抗碳化性能。(C)2017爱思唯尔有限公司版权所有
For putting geopolymer (GP) to practical use in reinforced concrete, the carbonation resistance of GP concrete should be clarified. In this study, the carbonation depths of various GP concrete and GP mortar, of which the aluminosilicate materials were fly ash (FA) and ground blast furnace slag (BFS), were measured by the accelerated carbonation test at different elapsed times. The relationship between the carbonation depth and the elapsed time were further examined based on the experimental results and by theoretical analysis. A root function was proposed to describe the carbonation rate of FA&BFS-based GP concrete. Finally, the influencing factors of carbonation resistance of FA&BFS-based GP concrete were discussed through a comparison of carbonation rate coefficients. It is mainly concluded that the carbonation resistance of FA&BFS-based GP concrete cured at room temperature is lower than usual concrete using Ordinary Portland Cement (OPC). The carbonation resistance increases with the increase of BFS ratio in active fillers (AF), NaOH content in active activator solution (AS), and BFS fineness, or with the decrease of AS/AF ratio, and water/AF ratio. Moreover, heat curing and the use of the retarder are benefit to the carbonation resistance of FA&BFS-based GP concrete. (C) 2017 Elsevier Ltd. All rights reserved.