Cracking mechanisms in durable sisal fiber reinforced cement composites

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• 作者：Flá ; vio de Andrade Silva ; Barzin Mobasher ; Romildo Dias Toledo Filho
• 关键词：Natural fiber ; Cement composites ; Crack formation ; Image analysis
• 刊名：Cement and Concrete Composites
• 出版年：2009
• 出版时间：November 2009
• 年：2009
• 卷：31
• 期：10
• 页码：721-730
• 全文大小：1157 K

文摘

Fiber reinforced cement composite laminates with long sisal fibers were manufactured using a cast hand lay up technique. A matrix with partial cement replacement by metakaolin and calcined waste crushed clay brick was used in order to improve the durability aspects. Mechanical response was measured under tension and bending tests while crack formation was investigated using a high resolution image capturing procedure. Crack spacing was measured using image analysis and correlated with the applied strain under both the tensile and bending response. Various stages of loading corresponding to initiation, propagation, distribution, opening, and localization of a crack system in the specimen are discussed. The effect of flexural cracking on the location of neutral axis during the bending tests was measured using strain-gages.