Title: | Temperature-induced Chemical Changes in Soundless Chemical Demolition Agents |
Authors: | Natanzi, Atteyeh S. Laefer, Debra F. Kakali, Glikeria Zolanvari, S.M. Iman |
Keywords: | Soundless Chemical Demolition Agents;Ettringite;Thermogravimetry analysis;Hydration;Calcium Hydroxide;Temperature;X-Ray Diffraction |
Issue Date: | Jul-2019 |
Publisher: | ASCE |
Citation: | Natanzi, A.S., Laefer, D.F., Kakali, G., Zolanvari, S.M.I. (2019). Temperature-Induced Chemical Changes in Soundless Chemical Demolition Agents. Journal of Materials in Civil Engineering, 31(7), 10.1061/(ASCE)MT.1943-5533.0002653 |
Abstract: | This paper explores 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: (1) the unconfined portions of hydrated specimens contained more CaCO3 due to carbonation of Ca(OH)2, where confined portions had higher Ca(OH)2 concentrations; (2) all materials tested at 19°C ambient temperatures 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 that which formed at 2°C. |
URI: | http://hdl.handle.net/2451/44419 |
Appears in Collections: | Debra Laefer's Collection |
Files in This Item:
File | Description | Size | Format | |
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SCDA Chemical Open Rep.pdf | Post-print | 1.99 MB | Adobe PDF | View/Open |
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