In this study, a number of different fibers - namely kenaf, jute, abaca, coir and sisal - were investigated as natural alternatives to polypropylene (PP) fibers for reducing plastic shrinkage cracking. The risk of plastic shrinkage cracking of mortars with water-to-cement ratio 0.5 containing either 0.6 or 0.9 kg/m3 of natural fibers was assessed according to the ASTM C1579-21 standard and compared with plain mortars and mortars with PP fibers. The water absorption of the natural fibers was low enough that (at the employed dosages) the effect on the workability and on other fresh properties was small. The natural fibers also had no measurable influence on cement hydration in the examined mortars, as revealed by isothermal calorimetry.

中文翻译：

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使用天然纤维 - 洋麻、蕉麻、椰壳纤维、黄麻和剑麻减少塑料收缩开裂


在这项研究中，研究了许多不同的纤维——即洋麻、黄麻、蕉麻、椰壳纤维和剑麻——作为聚丙烯 （PP） 纤维的天然替代品，以减少塑料收缩开裂。根据 ASTM C1579-21 标准评估了含有 0.6 或 0.9 kg/m3 天然纤维的水灰比为 0.5 的砂浆的塑性收缩开裂风险，并与普通砂浆和含 PP 纤维的砂浆进行了比较。天然纤维的吸水率足够低，以至于（在所用量下）对加工性和其他新鲜性能的影响很小。正如等温量热法所揭示的那样，天然纤维对所检查砂浆中的水泥水化也没有可测量的影响。