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Definition of optimal parameters for supercritical carbonation treatment of vegetable fiber-cement composites at a very early age

机译：在很早的年龄就确定超临界碳化处理植物纤维水泥复合材料的最佳参数

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This paper presents a study of cellulose pulp fiber-cement composites subjected to supercritical carbonation at a very early age. The raw materials used for the creation of cementitious composite mixes include: Portland cement, limestone filler, and cellulose pulp. Composites were produced by a slurry vacuum dewatering process and subjected to curing conditions which studied the effect of supercritical carbonation concentration (0% and close to 100% of CO2), the effect of cellulosic pulp (unbleached or bleached), and durability. All samples were subjected to mechanical, physical, and microstructural tests. The initial period of thermal curing (varying from 24 h to 48 h) and exposure time to carbonation (from 1 h to 2 h), did not have a statistically significant effect on the mechanical performance of the composites. However, the flexural test results of carbonated composites reinforced with bleached pulp showed a statistically significant improvement when compared to unbleached pulp reinforcement (24% increased average modulus of rupture). Thus, for cementitious composites cured with supercritical carbonation, the use of bleached cellulosic pulp, 24 h of thermal hydration and 1 h in an environmental chamber provided the optimal curing conditions and the most desirable properties in this study. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文介绍了纤维素纸浆纤维水泥复合材料在很早的时候就经受超临界碳化的研究。用于创建水泥复合混合物的原料包括：波特兰水泥，石灰石填料和纤维素纸浆。通过浆料真空脱水工艺生产复合材料，并使其经受固化条件，该条件研究了超临界碳酸化浓度（0％且接近100％的CO2）的影响，纤维素纸浆（未漂白或漂白）的影响以及耐久性。所有样品均经过了机械，物理和微观结构测试。热固化的初始阶段（从24小时到48小时不等）和暴露在碳酸中的时间（从1小时到2小时）对复合材料的机械性能没有统计学上的显着影响。但是，与未漂白纸浆增强材料相比，用漂白纸浆增强的碳酸复合材料的弯曲试验结果显示出统计学上的显着改善（平均断裂模量提高了24％）。因此，对于用超临界碳酸固化的水泥复合材料，使用漂白纤维素纸浆，24小时热水合和在环境室中1小时提供了最佳的固化条件和本研究中最理想的性能。 （C）2017 Elsevier Ltd.保留所有权利。

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