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This book forms the proceedings of the international workshop to be held in Essen, Germany. This workshop summarises the conclusion of the technical committee's investigations into the resistance of concrete to freeze-thaw attack, specific in this to resistance with or without de-icing chemicals. It presents the RILEM recommendations on testing the freeze-thaw and de-icing salt resistance of concrete.
In order to clarify the deterioration process and damage mechanism of lightweight aggregate concrete when subjected to freezing and thawing, it is necessary to investigate the effects of lightweight aggregate on the concrete performance and analyze the relationship of freeze-thaw resistance between them. In this study, rapid freezing and thawing tests were conducted on lightweight concrete and lightweight coarse aggregate, respectively. The results of the concrete tests showed that the freeze-thaw resistance of lightweight concrete was mainly controlled by the water content of the lightweight aggregate. The tests of lightweight aggregate produced similar results: The higher the water content of the aggregate, the higher the weight loss and grain ratio passing 10 mm sieve; the lower the crushing strength, the larger the pore volume after freezing and thawing. When the lightweight aggregate with high water content was subjected to freezing and thawing, the pore volume grew larger since the aggregate structure suffered damage from frost expansion inside the structure. Micro-cracks began to form in the lightweight aggregate, then enlarged and spread to the adjacent mortar, and finally caused expansion and damage of lightweight concrete.
Pore Structure of Cement-Based Materials provides a thorough treatment of the experimental techniques used to characterize the pore structure of materials. The text presents the principles and practical applications of the techniques used, organized in an easy-to-follow and uncomplicated manner, providing the theoretical background, the way to analyze experimental data, and the factors affecting the results. The book is the single comprehensive source of the techniques most commonly used for pore structure analysis, covering simple techniques like mercury intrusion porosimetry and water absorption, to the more sophisticated small-angle scattering and nuclear magnetic resonance. The book is an essential reference text for researchers, users, and students in materials science, applied physics, and civil engineering, who seek a deep understanding of the principles and limitations of the techniques used for pore structure analysis of cement-based materials.