Effect of calcined clay on aging of sisal short fiber reinforced mortar

Revista Brasileira de Engenharia Agrícola e Ambiental

Lima, Paulo R. L.²  Toledo Filho, Romildo D.³  Farias Filho, João de¹ 

[1] UEFS, Feira de Santana;UFRJ, Rio de Janeiro

关键词: sisal fibers;    composites;    brick waste;    flexural behaviour;    accelerated aged    INTRODUÇÃO Estudos sobre a utilização da fibra de sisal como reforço de matrizes à base de cimento foram iniciados na década de 70;    como alternativa para desenvolvimento de elementos de cobertura em países subdesenvolvidos (Swift & Smith;    1979);   

DOI  :  10.1590/S1415-43662010001000013

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

In the last few years a growing interest in the use of sisal fibers as reinforcement in cement based composites has been observed. However, the main concern for its use is related with the durability of the fibers in the alkaline water of concrete as they can mineralize due to the migration of calcium hydroxide to the fiber lumen and cell walls. In this study, the alkalinity of the matrix was reduced using metakaolin and crushed waste calcined clay bricks as cement replacement. The percentage of cement replacement ranged from 20 to 40% on weight basis. Flexural tests were carried out in the composites after 28 days of cure in water, 135 and 180 days of ageing in the open air and after 94 cycles of wetting and drying. These results indicated that the mixture with cement replacement consumed all calcium hydroxide and kept the toughness over time.

【 授权许可】

CC BY-NC