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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Using Acoustic Emission to Montitor Damage Development in Mortars Restrained from Volumetric Changes
Author(s): T. Chariton and W. J. Weiss
Publication: Special Publication
Appears on pages(s): 205-218
Keywords: acoustic emission, cracking, damage, early-age, fracture, microcracking, moisture profile, restrained shrinkage, shrinkage
Abstract:Early-age cracking can occur in cementitious materials when volumetric changes caused by temperature or moisture fluctuations are prevented by the surrounding structure. This paper describes a preliminary study in which early-age damage development was monitored in restrained cementitious mortar specimens using acoustic emission. A steel testing frame was used to provide passive restraint to uni-axial specimens. Free shrinkage characteristics were measured using geometrically similar specimens. Acoustic sensors were mounted on the surface of the mortar and acoustic activity was recorded continuously. The experiment revealed that the acoustic activity in the free and restrained specimens was initially similar, however the restrained specimens generated an increase in acoustic activity at later ages. This presumably occurs as a result of the increase in the residual stress to strength ratio. The age of visible cracking was observed to correlate well with a discrete, sudden increase in acoustic activity. Acoustic energy was used to indicate the change in the properties of the acoustic events as the concrete grows closer to the age of cracking. The location of damage was determined in the specimes using a linear approach that corresponded well with visual observation.
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