Influence of Chemical Additives on the Hydration Characteristics of Western Larch Wood-Cement-Water Mixtures

The influence of 30 inorganic and organic accelerators on hydration temperatures of a western larch cement mixture was determined. Seventeen compounds caused an increase in temperature from 25.4?C to over 28.5?C, when the amount of chemical added was 2 percent of cement weight. The highest temperature reached was by addition of FeCl3 (48.5?C). For the eight best compounds, the influence of the amount of additives on the exothermic behavior of the mixture was investigated. Increasing the amount of accelerator increased the maximum hydration temperature and decreased the time required to reach this temperature. SnCl2, FeCl3 and CaCl2 produced a significant effect on the mixture. When applied at 5 or 6.5 percent (based on cement weight), SnCl2, FeCl3, and AlCl3 produced a maximum hydration temperature above 60?C, while the time needed to reach this temperature varied from 1.3 to 26 hours. On the basis of results of the study, an explanation is offered on the interaction between the accelerators and larch cement mixture.

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