Physical and mechanical properties of durable sisal fiber-cement composites
Physical and mechanical properties of durable sisal fiber-cement composites
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DOI：
10.1016/j.conbuildmat.2009.10.030
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发表时间：
2010-05-01
影响因子：
7.4
通讯作者：
Rego Fairbairn, Eduardo de Moraes
中科院分区：
文献类型：
--
作者：
Silva, Flavio de Andrade;Toledo Filho, Romildo Dias;Rego Fairbairn, Eduardo de Moraes
研制了剑麻纤维-水泥长单向排列纤维增强复合材料，并对其物理力学性能进行了表征。在自密实水泥基质中，通过手工布置纤维来浇铸平面和波纹板，并以3mpa的压力进行压缩。通过直接拉伸和弯曲试验确定了复合材料的初裂、峰后强度和韧性。通过干燥收缩率、毛细吸水率和水密性等试验对复合材料的物理性能进行表征。为了保证复合材料的耐久性，在普通硅酸盐水泥基体中加入偏高岭土和煅烧后的废碎粘土砖，消耗硅酸盐水泥水化过程中产生的氢氧化钙。通过热水浸渍加速老化试验，确定了复合材料的耐久性。制备的材料在60℃下的热水浸泡6个月后，在弯曲作用下仍表现出多重开裂行为，使用扫描电镜观察了复合材料老化前后的微观组织。2009爱思唯尔有限公司版权所有。
Sisal fiber-cement composites reinforced with long unidirectional aligned fibers were developed and their physical-mechanical behavior was characterized in the present study. Flat and corrugated sheets were cast by a manual lay-out of the fibers in a self-compacted cement matrix and compressed with a pressure of 3 MPa. Direct tensile and bending tests were performed to determine the first crack, post-peak strength and toughness of the composites. Drying shrinkage, capillary water absorption and water tightness tests were performed to characterize the physical properties of the composites. To ensure the composite durability, the ordinary Portland cement matrix was modified by adding metakaolin and calcined waste crushed clay brick to consume the calcium hydroxide generated during Portland cement hydration. The durability of the newly developed composite was determined through accelerated aging conditions using the hot-water immersion test. The developed material presented a multiple cracking behavior under bending, even when subjected to 6 months of hot-water immersion under 60 degrees C. Scanning Electron Microscopy was used to investigate the micro-structure of the composites before and after aging. (C) 2009 Elsevier Ltd. All rights reserved.