The effects of composition and carbon dioxide injection time on the properties of wood-cement composites

Effect of moisture content on manufacturing cement-bonded particleboard using supercritical CO2

“…It seemed reasonable to conclude that during the curing of CBP using supercritical CO 2 , the MC should be about 30% with a w/c ratio of 0.34. Figure 2 shows the MOR and MOE values of CBP treated with supercritical CO 2 [6] also found that an excessively low or excessively high w/c ratio resulted in lower strength of the wood-cement composite, because of the reduced carbonation reaction by either lack of water reactant or the blockage of carbon dioxide pathways by an excessive amount of water. This research showed that when the w/c ratio was either 0.3 or 0.5, carbonation increased with a decreasing wood fiber/cement ratio to 0.42.…”

“…Furthermore, the peak intensity of CaCO 3 of CBP treated by supercritical CO 2 increased significantly with increased MC of CBP. The peak intensity Water-cement ratio (w/c) [6] also proved when the original water amount is not sufficient, there is less water in the mixture available for the carbonation reaction, resulting in lower carbonation degree and decreasing the strength of wood-cement composite.…”

“…Qi and Cooper [6] clarified that the injection of CO 2 gas during pressing is one of the methods to reduce the pressing (setting) time of cement, but the resulting board properties are almost the same as those produced by the conventional method [8], and there is the disadvantage that at least 14 days are required to achieve complete curing [9]. In our previous study [10], we found that the performance of CBP can be changed by the curing treatment with supercritical CO 2 .…”

“…In the field of cement-based materials, Boutouil and Levacher [5] investigated the effect of high initial water content and hydrated cement paste on the mechanical performance and porosity. Furthermore, Qi and Cooper [6] examined the effects of wood fiber/cement ratio, water/ cement ratio, and carbon dioxide injection time on the properties of wood-cement composites. This research showed that the wood fiber/cement ratio, the water/cement ratio and their interaction significantly influenced the carbonation reaction and strength of wood-cement composites subjected to 4 min of carbon dioxide injection during the setting process.…”

A Study on Recycling of Paper Sludge and Steel Slag Based on Circular Economy

“…[5] Regardless of landfill, incineration or ocean disposal, there are secondary pollution, power source consuming and space holding in the treatment of paper sludge, so paper sludge couldn't be treated usefully. [6,7] All these resulted in extremely shortage of resource and energy and a serious pollution of environment, due to the unbalanced technological level of construction projects. The point that how to achieve the coordinate development among enterprise, environment and society, minimize the resource and energy cost, improve the competitive force of enterprise, achieve the sustainable development of iron-steel industry become the priority for the iron-steel industry.…”