The investigation of basic processes of rapidly hardening wood-cement-water mixture with CO2
author: Hucheng Qi hqi@durisol.com Durisol, A division of Armtec Limited Partnership 51 Arthur Street South N0K 1N0 Mitchell ON; Paul A. Cooper Faculty of Forestry University of Toronto 33 Willcocks Street M5S 3B3 Toronto ON; Doug Hooton Department of Civil Engineering University of Toronto 35 St. George Street M5S 1A4 Toronto ON
source date: Online
edition published: 2009
language: en

Abstract

The rapid hardening of wood-cement-water mixture in a carbon dioxide enriched environment was investigated, by studying the development of carbonation degree and monitoring the phase changes in the mixture. The carbonation reaction was a diffusion-controlled process. It occurred very quickly in the first two minutes of reaction. After that, its rate decreased drastically, due to the increasing difficulty of transporting reactants to reaction sites. Jander’s model was found ineffective in predicting the carbonation process. However, its modified version, developed by Kroger and Ziegler, could describe this progress accurately. In addition, the rapid hardening appeared to result mainly from the reactions of calcium silicates in cement with carbon dioxide. The reaction between ettringite and carbon dioxide might also contribute to this rapid hardening process. However, the reaction between calcium hydroxide and carbon dioxide was not confirmed.

Zusammenfassung

Untersucht wurde die schnelle Härtung einer Holz-Zement-Wasser-Mischung in einer mit Kohlendioxid angereicherten Atmosphäre. Dabei wurde der Fortschritt des Karbonatisierungsgrades sowie der Phasenwechsel in der Mischung bestimmt. Bei der Karbonatisierungsreaktion handelt es sich um einen diffusionsgesteuerten Prozess. Dieser verläuft in den ersten zwei Minuten der Reaktion sehr schnell und verlangsamt sich danach sehr stark, da der Transport der Reaktanten zu den Reaktionsstellen zunehmend schwieriger wird. Das Modell von Jander erwies sich für die Vorhersage des Karbonatisierungsprozesses als ungeeignet. Allerdings konnte durch die von Kroger und Ziegler modifizierte Version der Ablauf genau beschrieben werden. Außerdem schien die schnelle Härtung hauptsächlich auf den Reaktionen der Kalziumsilikate im Zement mit dem Kohlendioxid zu beruhen. Die Reaktion zwischen Ettringit und Kohlendioxid könnte auch zur schnellen Härtung beigetragen haben. Die Reaktion zwischen Kalziumhydroxid und Kohlendioxid wurde jedoch nicht bestätigt.

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