固碳插层材料抑制混凝土碳化反应的基础研究

大掺量矿物掺合料是现代高性能混凝土的主要特征之一，但由此带来的碳化速率加快的问题威胁着混凝土结构的耐久性。所以，增强抗碳化能力对于现代混凝土长寿命化和低环境负荷化至关重要。本项目旨在利用无机插层材料的阴离子交换和结构重建特性，捕捉混凝土中的碳酸根并嵌锁于插层材料层板间，使之"固化"由此增强混凝土的抗碳化性能。为此，拟开展无机插层材料与水化水泥体系的相互作用的研究，探明碳酸根离子发生离子交换和固化的机制，掌握影响离子交换和结构重建过程的主要因素，揭示无机插层材料对混凝土微结构和性能的影响规律。在此基础上，发展插层材料改性混凝土的设计方法，建立其碳化过程计算机仿真模型，探索以无机插层材料为核心的可调控抗碳化能力的混凝土性能调节剂的开发途径，并开展插层材料固化其他类型阴离子的探索性研究。研究成果不仅有助于解决大掺量矿物掺合料混凝土碳化速率加快的问题，而且有望构建本征的混凝土化学侵蚀防御体系。

One of the most important features of modern high-performance concrete is high volume fraction of mineral addition，which often causes faster carbonation rate of concrete and hence threatens the durability of concrete structures.It is vital to enhance carbonation resistancy of modern concrete so as to a longer service life and being environmentally-friendly.This study aims to catch carbonate ions in concrete and to fix them in intercalation layers, in order to improve carbonation resistancy by means of the properties of anion-exchange and structure re-construction of the intercalated layered materials.It is to study the interactions between the inorganic intercalated layered material and hydrating cement system, and to reveal the mechanism of the exchange and immobilization of carbonate ions, and to master the main factors affecting exchange and immobilization of carbonate ions, and to establish the law of effects of the intercalation material on microstructure and performance of concrete.On this basis, it is to develop a design methodology of concrete modification with intercalated layered materials, and to build the computation model of the carbonation process, and to explore a new type of functional adjusting admixture for preventing carbonation. The results are expected not only to solve the problem of rapid carbonation of concrete with high volume fraction of mineral admixture, but also to build an inherent defence system against chemical aggression into concrete structures.