碱激发矿渣地质聚合物存在脆性大、韧性差、易开裂等缺陷.利用纤维/混杂纤维对矿渣地质聚合物进行改性,以纤维-矿渣地质聚合物复合材料的弯曲强度与弯曲韧性作为考察指标,分析了3种单一纤维及2种混杂纤维对矿渣地质聚合物的增强与增韧效果.研究结果表明,碳纤维增强效果优于钢纤维、玄武岩纤维,钢纤维增韧效果优于碳纤维、玄武岩纤维,而玄武岩纤维增强及增韧效果相对较差;碳纤维与钢纤维混杂,可充分发挥碳纤维的增强效应和钢纤维的增韧效应,适当掺量下混杂纤维较单一纤维具有更好的增强与增韧效果;纤维与浆料的容重差对矿渣地质聚合物硬化体的均质性具有重要影响,碳纤维与钢纤维混杂可显著降低不同加载方向下矿渣地质聚合物弯曲强度与弯曲韧性的离散性.%Alkali-activated slag geopolymers have some weaknesses ,such as high brittleness ,poor toughness ,and easy to crack .In this study ,fiber/hybrid fibers were used to modify the slag geopolymer .The flexural strength and flexural toughness of the fiber slag geopolymer composites were taken as an index to analyze the reinforcing and toughening effect of three single fibers and two kinds of hybrid fibers on the slag geopolymers .The results indicate that the reinforcing effect of carbon fiber is better than that of steel fiber and basalt fiber ,and the toughening effect of steel fiber is better than the others ,whereas basalt fiber has relatively poor performance in both reinforcing and toughening effect .Mixing carbon fiber and steel fiber can give full play to the reinforcing effect of carbon fiber and the toughening effect of steel fiber ,and adding appropriate amount of mixed fiber will make the materials better in both strength and toughness than the single fiber ;The unit weight difference between fiber and slurry has an important effect on the homogenization of the slag geopolymer .The mixture of carbon fiber and steel fiber can significantly reduce the flexural strength and flexural toughness of slag geopolymers under different loading directions .
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