Temperature-Induced Chemical Changes in Soundless Chemical Demolition Agents

Atteyeh S. Natanzi; Debra F. Laefer; Glikeria Kakali; S. M. Iman Zolanvari

doi:10.1061/(ASCE)MT.1943-5533.0002653

Temperature-Induced Chemical Changes in Soundless Chemical Demolition Agents

Atteyeh S. Natanzi, Debra F. Laefer, Glikeria Kakali, S. M. Iman Zolanvari

Urban Initiative

Research output: Contribution to journal › Article › peer-review

Abstract

This paper explored the relationship between ambient temperature, calcium oxide (CaO) hydration, and calcium carbonate (CaCO3) generation in cold and moderate ambient temperatures (2°C-19°C). A total of 22 samples from 2 commercial soundless chemical demolition agents (SCDAs) were tested in 36-mm-diameter×170-mm-long steel pipes. The raw powder and materials resulting from hydration were subjected to X-ray diffraction analysis, derivative thermogravimetric analysis, and thermogravimetry analysis. Raw and hydrated specimens proved chemically distinctive. Experimental results showed that (1) the unconfined portions of hydrated specimens contained more CaCO3 due to carbonation of Ca(OH)2, and confined portions had higher Ca(OH)2 concentrations; (2) all materials tested at 19°C ambient temperature had Ca(OH)2 concentrations nearly 10% greater than those tested at 2°C; and (3) the higher Ca(OH)2 concentrations formed at 19°C generated 350% greater expansive pressure than did those that formed at 2°C.

Original language	English (US)
Article number	04019098
Journal	Journal of Materials in Civil Engineering
Volume	31
Issue number	7
DOIs	https://doi.org/10.1061/(ASCE)MT.1943-5533.0002653
State	Published - Jul 1 2019

Keywords

Calcium hydroxide
Ettringite
Hydration
Soundless chemical demolition agents
Temperature
Thermogravimetry analysis
X-ray diffraction

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Materials Science(all)
Mechanics of Materials

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title = "Temperature-Induced Chemical Changes in Soundless Chemical Demolition Agents",

abstract = "This paper explored the relationship between ambient temperature, calcium oxide (CaO) hydration, and calcium carbonate (CaCO3) generation in cold and moderate ambient temperatures (2°C-19°C). A total of 22 samples from 2 commercial soundless chemical demolition agents (SCDAs) were tested in 36-mm-diameter×170-mm-long steel pipes. The raw powder and materials resulting from hydration were subjected to X-ray diffraction analysis, derivative thermogravimetric analysis, and thermogravimetry analysis. Raw and hydrated specimens proved chemically distinctive. Experimental results showed that (1) the unconfined portions of hydrated specimens contained more CaCO3 due to carbonation of Ca(OH)2, and confined portions had higher Ca(OH)2 concentrations; (2) all materials tested at 19°C ambient temperature had Ca(OH)2 concentrations nearly 10% greater than those tested at 2°C; and (3) the higher Ca(OH)2 concentrations formed at 19°C generated 350% greater expansive pressure than did those that formed at 2°C.",

keywords = "Calcium hydroxide, Ettringite, Hydration, Soundless chemical demolition agents, Temperature, Thermogravimetry analysis, X-ray diffraction",

author = "Natanzi, {Atteyeh S.} and Laefer, {Debra F.} and Glikeria Kakali and {Iman Zolanvari}, {S. M.}",

note = "Funding Information: The authors thank Derek Holmes, lab technician, University College Dublin for his tireless efforts in the lab throughout the research, and C. Aspiotis for his contribution in XRD and TG experiments. This work was supported by Science Foundation Ireland (12/ERC/12534). Publisher Copyright: {\textcopyright} 2019 American Society of Civil Engineers.",

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N1 - Funding Information: The authors thank Derek Holmes, lab technician, University College Dublin for his tireless efforts in the lab throughout the research, and C. Aspiotis for his contribution in XRD and TG experiments. This work was supported by Science Foundation Ireland (12/ERC/12534). Publisher Copyright: © 2019 American Society of Civil Engineers.

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N2 - This paper explored the relationship between ambient temperature, calcium oxide (CaO) hydration, and calcium carbonate (CaCO3) generation in cold and moderate ambient temperatures (2°C-19°C). A total of 22 samples from 2 commercial soundless chemical demolition agents (SCDAs) were tested in 36-mm-diameter×170-mm-long steel pipes. The raw powder and materials resulting from hydration were subjected to X-ray diffraction analysis, derivative thermogravimetric analysis, and thermogravimetry analysis. Raw and hydrated specimens proved chemically distinctive. Experimental results showed that (1) the unconfined portions of hydrated specimens contained more CaCO3 due to carbonation of Ca(OH)2, and confined portions had higher Ca(OH)2 concentrations; (2) all materials tested at 19°C ambient temperature had Ca(OH)2 concentrations nearly 10% greater than those tested at 2°C; and (3) the higher Ca(OH)2 concentrations formed at 19°C generated 350% greater expansive pressure than did those that formed at 2°C.

AB - This paper explored the relationship between ambient temperature, calcium oxide (CaO) hydration, and calcium carbonate (CaCO3) generation in cold and moderate ambient temperatures (2°C-19°C). A total of 22 samples from 2 commercial soundless chemical demolition agents (SCDAs) were tested in 36-mm-diameter×170-mm-long steel pipes. The raw powder and materials resulting from hydration were subjected to X-ray diffraction analysis, derivative thermogravimetric analysis, and thermogravimetry analysis. Raw and hydrated specimens proved chemically distinctive. Experimental results showed that (1) the unconfined portions of hydrated specimens contained more CaCO3 due to carbonation of Ca(OH)2, and confined portions had higher Ca(OH)2 concentrations; (2) all materials tested at 19°C ambient temperature had Ca(OH)2 concentrations nearly 10% greater than those tested at 2°C; and (3) the higher Ca(OH)2 concentrations formed at 19°C generated 350% greater expansive pressure than did those that formed at 2°C.

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Temperature-Induced Chemical Changes in Soundless Chemical Demolition Agents

Abstract

Keywords

ASJC Scopus subject areas

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