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Revisiting the Mechanism of Carbonation Shrinkage of Autoclaved Aerated Concrete

机译：重新探究高压灭菌混凝土碳化收缩机制

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摘要

In the article the analysis with the generalization of experimental and theoretical studies of foreign and Russian scientists is given in order to compare, substantiate and refine existing scientific theories and statements on the nature and mechanism of carbonation factor effect on shrinkage properties and creep of cement stone and aerated concrete. It is pointed out that according to the existing opinions of foreign scientists (such as Powers, Ramachandran, Feldman, Swenson and Sereda), the mechanism of carbonation shrinkage of cement stone is considered as a topochemical process and consists in dilution of calcium hydroxide at the points of contact of crystals and formation of additional bonds during the precipitation of reaction products in new zones. The mechanism of the shrinkage of autoclaved aerated concrete during carbonation processes is explained in the framework of the scientific theories of Russian scientists E.S. Silayenkov and E.N. Chernyshov. This mechanism is classified as heterogeneous reaction, referring to its kinetic and diffusion component, where the main causes of shrinkage deformations are the intrinsic stresses of the crystalline intergrowth and the polymerization of silica gel, resulting from the interaction of hydrated calcium silicate with carbonic acid.
机译：在文章中，给出了与外国和俄罗斯科学家的实验和理论研究概括的分析，以比较，证实和改进现有的科学理论和关于碳化因子效应的性质和机制对水泥石的蠕变性质和蠕变和充气混凝土。有人指出，根据外国科学家的现有意见（如权力，兰哈顿兰州，长森，斯文斯兰，斯弗森和塞里达），水泥石石的碳化收缩机制被认为是一种拓扑化学过程，包括稀释氢氧化物晶体接触点和在新区中反应产物沉淀过程中的额外键的形成。碳化过程中高压灭菌混凝土收缩的机制在俄罗斯科学家E.S的科学理论框架中解释SILAYENKOV和E.N. Chernyshov。该机制被归类为异质反应，参考其动力学和扩散组分，其中收缩变形的主要原因是晶体凝胶的结晶晶体凝胶的内在应力，由水合钙硅酸钙与碳酸相互作用。

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