纤维对偏高岭土-矿渣基地聚合物的增韧改性

Fiber toughened metakaolin-slag geopolymer

在偏高岭土-矿渣基地聚合物中加入纤维改善地聚合物的韧性。用不同龄期样品的抗冲击功、抗折强度、样品受压过程分析和受压样品外貌及断口形貌显微分析等表征纤维对地聚合物的增韧效果。结果表明:BF型化纤可显著提高偏高岭土-矿渣基地聚合物的韧性。80℃养护条件下,BF型化纤掺量为0.7%时,样品3 d和28 d的抗冲击功较同龄期净浆提高了136.38%和188.62%,抗折强度提高了40.30%和37.33%;样品28 d的极限载荷较净浆提高了30.21%,受压破坏时的形变量增加了18.06%,且样品受压破坏的断裂功明显大于净浆的断裂功,极限载荷与失效载荷比值为1.60(净浆为1.13);BF型化纤穿插于硬化体结构内部,具有桥联搭接作用。

Fibers were used to improve the toughness of metakaolin-slag geopolymer.The influences of adding fiber were investigated by measuring the impact work,flexural strength of geopolymer,and observing the failure process under press,appearance of fractured samples as well as the microscopy of fracture surface.Results showed that fiber BF could toughen the metakaolin-slag geopolymer notably.The impact work of geopolymer with 0.7% fiber BF cured at 80 ℃ for 3 d and 28 d was increased by 136.38% and 188.62%.The flexural strength was improved by 40.30% and 37.33%.For the toughened sample cured at 80 ℃ for 28 d,the ultimate load increased by 30.21% and press deformation by 18.06%,thus the fracture work was higher than the net geopolymer.The ratio of ultimate load to failure load was 1.60（the ratio of net geopolymer was 1.13）.The fiber BF distributed in matrix of geopolymer offered a bridging function.