Identification of microcracks caused by autogenous shrinkage

Pietro Lura (Invited author), Ole Mejlhede Jensen (Invited author), Ye Guang (Invited author), Kyoji Tanaka (Invited author)

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch

Abstract

Detection and quantification of microcracks caused by restrained autogenous shrinkage in high-performance concrete is difficult. Available techniques either lack the required resolution or may cause further cracks indistinguishable from the original ones. The new technique presented in this paper allows detection of microcracks while avoiding artifacts induced by unwanted restraint, drying or temperature variations. The technique consists of casting small circular cylindrical samples of cement pastes in silicone moulds. Steel rods of different diameters are cast into the cement paste to restrain the autogenous shrinkage and cause crack formation during hardening. Subsequently, liquid gallium is intruded into the cracks under pressure. After solidification of the gallium, the crack pattern is frozen and can be analyzed after plane polishing of the samples. The microcracks are identified by optical microscopy, electron probe micro analysis, EPMA, and scanning electron microscopy, SEM. A preliminary analysis of the observed microcracks is presented in this paper.
Original languageEnglish
Title of host publicationMaterials Science in 21st century for the construction industry : Durability, Repair and Recycling of Concrete Structures
Place of PublicationSapporo, Japan
PublisherHokkaido University
Publication date2005
Pages1-76
Publication statusPublished - 2005
EventMaterials Science in 21st century for the construction industry : Durability, Repair and Recycling of Concrete Structures - Sapporo, Japan, August 11
Duration: 1 Jan 2005 → …

Conference

ConferenceMaterials Science in 21st century for the construction industry : Durability, Repair and Recycling of Concrete Structures
CitySapporo, Japan, August 11
Period01/01/2005 → …

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