Tensile characterisation of thick sections of Engineered Cement Composite (ECC) materials
Tensile characterisation of thick sections of Engineered Cement Composite (ECC) materials
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DOI：
10.1007/s10853-014-8649-6
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发表时间：
2015-01-01
影响因子：
4.5
通讯作者：
Rimes, M.
中科院分区：
文献类型：
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作者：
Boughanem, S.;Jesson, D. A.;Rimes, M.
工程水泥复合材料(ECC)有潜力用于需要一定水平的拉应力下的伪延性的应用。以前的大部分工作都集中在相对较薄的样品上。然而，对于未来的土木工程应用，了解较厚试件的性能是非常必要的。在本工作中，包含水泥粉、水、聚合物纤维和外加剂的试件通过两种不同的工艺制造并进行了拉伸测试。在拉伸试验中观察到了多个基体裂纹，导致了假塑性行为。对样品密度和孔隙率的互补测量表明，高孔隙率可能与增强的拉伸应变到破坏有关，而高密度与高最大应力有关。扫描电子显微镜对纤维分散性的分析表明，纤维沿拉伸测试轴线取向的比例越大，其力学性能越好，且这种取向与制造工艺有关。
Engineered Cement Composite (ECC) materials have the potential to be used in applications where a level of pseudo-ductility under tensile stress is required. Most previous work has focussed on comparatively thin specimens. For future civil engineering applications, however, it is imperative that the behaviour of thicker specimens is understood. In the present work, specimens containing cement powder, water, polymeric fibres and admixtures were manufactured following two different processes and tested in tension. Multiple matrix cracking was observed during tensile testing, leading to a pseudoductile behaviour. Complementary measurements of sample density and porosity suggest that a high porosity could be linked with an enhanced tensile strain-to-failure whereas high density is associated with a high maximum stress. The fibre dispersion, assessed by scanning electron microscopy, indicated that mechanical performance was enhanced with increasing proportion of fibres aligned along the tensile test axis, and this orientation can be linked to the manufacturing process.