Impact of thermal transfer on hydration heat of a Soundless Chemical Demolition Agent

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Title: Impact of thermal transfer on hydration heat of a Soundless Chemical Demolition Agent
Authors: Laefer, Debra F.
Natanzi, Atteyeh S.
Zolanvari, S. M. Iman
Permanent link: http://hdl.handle.net/10197/9711
Date: 30-Oct-2018
Online since: 2019-03-27T10:35:43Z
Abstract: This paper explores thermal transfer effects in Soundless Chemical Demolition Agents (SCDA). In a 10°C water bath, quadrupling the volume of SCDA in a pipe accelerated peak hydration onset and resulted in a 700% increase in expansive pressure and a 20% increase in volumetric expansion. An equivalent sample in a constant temperature chamber showed an almost 5°C greater hydration heat than in the water bath, which resulted in a six-fold expansive pressure difference after 4 days of testing and an order of magnitude more pressure in the first 24 h, thereby demonstrating limitations of previous SCDA experimental work and providing a temperature-based reason for discrepancies between large-scale testing and manufacturers’ predictions. Since most construction projects have scheduling requirements, understanding how to achieve sufficiently high pressures within a single work shift is important for evaluating the field viability of SCDAs on a particular project.
Funding Details: Enterprise Ireland
Science Foundation Ireland
Type of material: Journal Article
Publisher: Elsevier
Journal: Construction and Building Materials
Volume: 187
Start page: 348
End page: 359
Copyright (published version): 2018 Elsevier
Keywords: Soundless Chemical Demolition AgentExpansive cementAmbient temperatureBorehole diameterNon-expansive demolition agentThermal transferBristarHeat of hydrationVolumetric expansionExpansive pressure
DOI: 10.1016/j.conbuildmat.2018.07.168
Language: en
Status of Item: Peer reviewed
Appears in Collections:Civil Engineering Research Collection

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