Are fibers sensitive to mixing?
Are fibers sensitive to mixing?
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DOI：
10.1002/suco.201600039
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发表时间：
2017-02
影响因子：
3.2
通讯作者：
Olivér Czoboly;G. Balázs
中科院分区：
文献类型：
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作者：
Olivér Czoboly;G. Balázs
纤维混凝土(FRC)的开裂后行为主要受纤维类型、纤维掺量、纤维取向和混凝土强度的影响。纤维制造商建议在将纤维添加到混凝土中以获得可接受的纤维分散性后的最短搅拌时间。最长的混合时间是多少？纤维特性(拉伸强度、长度、表面特性、形状和密度)通常由纤维生产商指定。然而，硬化FRC的性能受混合后纤维的性能影响。一个重要的问题是，纤维的性质是否会因为偶尔较长的混合时间而发生变化。纤维的表面特征、长度或拉伸强度在混合过程中是否会发生变化，这是否会影响FRC的性能？在一项广泛的实验研究中，测试了两种大分子聚合物纤维、两种钢纤维(无涂层或有黄铜涂层)、两种玄武岩纤维(不同长度)和两种麻纤维编织(无保护和有亚麻油保护)。测试结果表明，混凝土中的一些纤维可能会因搅拌时间过长而变质。显示了可能的恶化模式。
The postcracking behavior of fiber‐reinforced concrete (FRC) is mostly influenced by the type of fiber, the amount of fibers, fiber orientation, and the concrete strength. Manufacturers of fibers propose a minimum mixing duration after fibers are added to concrete to obtain an acceptable dispersion of fibers. What about the maximum mixing time? Fiber properties (tensile strength, length, surface characteristics, shape, and density) are normally specified by the fiber producer. However, the properties of hardened FRC are influenced by the properties of fibers after mixing. An important question is whether the properties of fibers change due to an occasionally long mixing time. Can surface characteristics, length, or tensile strength of fibers change during mixing and can this affect the properties of FRC? In an extensive experimental study, two types of macro polymer fibers, two types of steel fibers (without coating or with brass coating), two basalt fibers (with different lengths), and two braids of hemp fibers (without protection and with linseed oil protection) were tested. The test results indicate possible deterioration for some of the fibers in concrete for too long mixing times. Possible modes of deterioration are shown.