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

Debra Laefer, Atteyeh S. Natanzi, S. M.Iman Zolanvari

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)348-359
Number of pages12
JournalConstruction and Building Materials
Volume187
DOIs
Publication statusPublished - Oct 30 2018

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Keywords

  • Ambient temperature
  • Borehole diameter
  • Bristar
  • Expansive cement
  • Expansive pressure
  • Heat of hydration
  • Non-expansive demolition agent
  • Soundless Chemical Demolition Agent
  • Thermal transfer
  • Volumetric expansion

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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