植物-矿物纤维改性地聚物抗硫酸盐侵蚀研究

Effect of Modified Geopolymers of Plant-mineral Fibers

地质聚合物的力学性能优异,但脆性较高。文中利用纤维素纤维(CF)和硅灰石纤维(WS)改性偏高岭土地质聚合物,揭示不同纤维/不同配合比对材料力学性能的影响和地聚物复合改性胶凝材料硫酸盐服役条件的抗侵蚀性能。结果表明,植物微纤维增强地聚合物复合材料的最佳组成为,纤维素微纤维/硅灰石纤维增强地聚合物复合材料(配方为88wt%MK+10wt%WS+2wt%CF),抗压强度和抗折强度分别提升76.1%、135.5%,且抗硫酸盐侵蚀性能得到显著提升。硫酸盐侵蚀条件下的优选配合比样品的质量损失率随龄期的增长呈现先减小后增大的趋势,在水溶液中浸泡的样品质量持续降低;暴露在超高浓度硫酸盐溶液中28d后的损伤程度会达到最大值或阈值。

Geological polymers have excellent mechanical properties,but high brittleness.In this paper,plant-mineral fiber reinforced geopolymers were prepared.The effects of different fiber ratios on the mechanical properties and the sulfate resistance of the geopolymers were explored.The results show that the optimal composition of plant microfiber-reinforced geopolymer:CF-WS reinforced geopolymer(88 wt%MK,10 wt%WS and 2 wt%CF),the compressive strength wAS increased by 76.1%,and the resistance to sulfate erosion was significantly improved.The mass loss rate of the preferred samples under the sulfate erosion decreased first with the increase of age and then increased.And the quality of samples soaked in water continued to decrease;The degree of damage after 28 days of exposure to high concentration sulfate solutions reaches a maximum or threshold.