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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.
Appears in Collections:Debra Laefer's Collection

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