Expansive fracture agent behaviour for concrete cracking

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Title: Expansive fracture agent behaviour for concrete cracking
Authors: Laefer, Debra F.
Huynh, Minh-Phuoc
Midgette, J.
Ceribasi, Seyit
Wortman, John
Permanent link: http://hdl.handle.net/10197/3441
Date: Jun-2010
Online since: 2012-01-19T17:20:01Z
Abstract: Increasing concerns regarding litigation and terrorism provide a strong dual motivation to decrease high explosives usage in the construction industry. This paper provides parameter considerations and initial guidelines for the application of expansive fracture agents, typically used for concrete and soft rock removal. This approach may be especially appropriate near environmentally and historically sensitive sites. Thirty-three unreinforced blocks (approximately a cubic meter each) of varying strengths composed of sand, cement, and flyash were tested under various temperature environments, with differing expansive agents, confinement levels, and post-cracking treatments. Cracking characteristics such as crack initiation and crack expansion were analyzed. Although the performance of expansive cement was dependent upon a highly complex set of variable interactions, higher ambient temperatures, higher agent mixture temperatures, and chemical configuration designed for colder temperatures decreased the time to first crack and hastened the extent of cracking. Conversely, higher strength material required more time to first crack, as well as an extended time to achieve a 25.4 mm wide crack. Manual interference with the normal material volume expansion slowed the cracking process but did not truncate it, while the manufacturer’s recommendation to introduce water post-cracking actually reduced and slowed the extent of cracking.
Funding Details: Irish Research Council for Science, Engineering and Technology
Type of material: Journal Article
Publisher: Institution of Civil Engineers/Thomas Telford Publishing
Journal: Magazine of Concrete Research
Volume: 62
Issue: 6
Start page: 443
End page: 452
Copyright (published version): 2010 Thomas Telford Ltd
Keywords: Soundless chemical demolition agents (SCDAs)DemolitionConcreteCracking
Subject LCSH: Wrecking
Expansive concrete
DOI: 10.1680/macr.2010.62.6.443
Language: en
Status of Item: Peer reviewed
Appears in Collections:Critical Infrastructure Group Research Collection
Civil Engineering Research Collection

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