Improvement of concrete carbonation resistance based on a structure modified Layered Double Hydroxides (LDHs): Experiments and mechanism analysis
Improvement of concrete carbonation resistance based on a structure modified Layered Double Hydroxides (LDHs): Experiments and mechanism analysis
复制标题
基于结构改性层状双氢氧化物（LDH）提高混凝土抗碳化性能：实验和机理分析
DOI：
10.1016/j.conbuildmat.2018.04.222
复制
发表时间：
2018-07-10
影响因子：
7.4
通讯作者：
Wang, X. P.
中科院分区：
文献类型：
--
作者：
Shui, Z. H.;Yu, R.;Wang, X. P.
本文介绍了一种基于结构改性类氢氧化物材料的新型抗碳化混凝土的设计，包括试验和机理分析。首先，根据LDHs的结构重构和记忆功能的概念，制备并评价了三种不同结构的Mg-Al-LDHs。热力学分析表明，当加热温度高于252.8℃时，镁铝LDHs的结构改性可以触发。然后，对不同结构改性的镁铝LDHs混凝土的抗碳化性能进行了测试和比较。试验结果表明，与其他结构改性的镁铝水滑石相比，煅烧后的镁铝水滑石混凝土的抗碳化性能有较大幅度的提高。此外，还利用几种混凝土碳化深度预测模型评价了结构改性镁铝低密度脂微粉混凝土的抗碳化性能。结果表明，与随机模型和碳化机理模型相比，多系数预测模型更适合用来预测混凝土的碳化深度。此外，本研究还探讨了结构改性镁铝LDHs对混凝土微观结构的影响。(C)2018爱思唯尔有限公司。保留所有权利。
This paper addresses a design of a novel concrete with advanced carbonation resistance based on application of a structure modified Layered Double Hydroxides (LDHs) like material, including experiments and mechanism analysis. First of all, according to the concept of structural reconstruction and memory function of LDHs, three types of Mg-Al-LDHs with different structures are produced and evaluated. The thermodynamics analysis demonstrates that the structural modification of Mg-Al-LDHs could be triggered when the heating temperature is higher than 252.8 degrees C. Then, the carbonation resistance of the concrete with different structure modified Mg-Al-LDHs are tested and compared. The obtained experimental results demonstrate that the carbonation resistance of concrete with calcined Mg-Al-LDHs can be mostly improved, compared to the samples with other structure modified Mg-Al-LDHs. Moreover, several concrete carbonation depth prediction models are employed to evaluate the carbonation resistance of the concrete with structure modified Mg-Al-LDHs. It is proved that, compared to the random model and carbonation mechanism model, the multiple coefficient prediction model is more suitable to be used to predict the carbonation depth for the concrete developed in this study. Additionally, the microstructure development of the concrete with structure modified Mg-Al-LDHs is also discussed in this research. (C) 2018 Elsevier Ltd. All rights reserved.