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 language | English (US) |
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Pages (from-to) | 348-359 |
Number of pages | 12 |
Journal | Construction and Building Materials |
Volume | 187 |
DOIs | |
State | Published - Oct 30 2018 |
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
- General Materials Science