Influence of polymer fibers on rheological properties of cement mortars
Influence of polymer fibers on rheological properties of cement mortars
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DOI：
10.1515/eng-2017-0029
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发表时间：
2017-01-01
期刊：
影响因子：
1.7
通讯作者：
Malaszkiewicz, Dorota
中科院分区：
文献类型：
--
作者：
Malaszkiewicz, Dorota
纤维在水泥基复合材料中的增强作用往往导致水泥基材料脆性的改善。但纤维的加入往往会降低新拌混凝土的工作性。传统的单点和易性试验不能用基本流变参数来表征混凝土的和易性。为此，本文描述了合成纤维添加量（纤维长度在12-50 mm的范围内，体积分数在0-4%的范围内）的纤维增强新拌砂浆（FRFM）的流变性能和这些性能随时间的发展的影响的调查。本研究中使用了Viskomat XL流变仪。在仪器和测试程序的限制下，它表明，FRFMs符合宾汉模型。天然冰后期砂0/4 mm用作细骨料，水泥CEM I 42.5 R用作粘合剂。选择三种商业合成纤维进行这些检查。流变性能表示的宾汉模型参数g（屈服值）和h（塑性粘度）。试验结果表明，纤维种类和体积分数对屈服应力和塑性粘度均有影响。
The reinforcing effect of fibers in cement composites often results in the improvement of the brittle nature of cementitious materials. But the decrease in the workability of fresh concrete is often the disadvantage of fibers addition. Conventional single-point workability tests cannot characterize workability of concrete in terms of fundamental rheological parameters. To this end, this paper describes an investigation of the influence of synthetic fiber additions (fiber length in the range 12-50 mm and volume fraction in the range 0-4%) on the rheological properties of fiber reinforced fresh mortar (FRFM) and development of these properties over time. The rheometer Viskomat XL was used in this study. Within the limitations of the instrument and testing procedure it is shown that FRFMs conform to the Bingham model. Natural postglacial sand 0/4 mm was used as a fine aggregate and cement CEM I 42.5 R was used as a binder. Three commercial synthetic fibers were selected for these examinations. Rheological properties were expressed in terms of Bingham model parameters g (yield value) and h (plastic viscosity). Based on the test results it was found out that the fiber type and volume fraction affected both the yield stress and plastic viscosity.