Temperature-induced Chemical Changes in Soundless Chemical Demolition Agents
|Authors:||Natanzi, Atteyeh S.|
Laefer, Debra F.
Zolanvari, S.M. Iman
|Keywords:||Soundless Chemical Demolition Agents;Ettringite;Thermogravimetry analysis;Hydration;Calcium Hydroxide;Temperature;X-Ray Diffraction|
|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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