Characteristic of Fresh and Harden Properties of Polyvinyl Alcohol Fibre Reinforced Alkali Activated Composite

4区材料科学 Q2 Environmental Science

Journal of Renewable Materials Pub Date : 2023-01-01 DOI:10.32604/jrm.2022.023266

Yiguang Wang, Zhe Zhang, Xun Zhang

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引用次数: 2

Abstract

Fibre can enhance the mechanical properties of cement-based composites, but fibre also degrades their workability. However, the quantitative effects of fiber content and length-diameter ratio on alkali-activated materials are still unclear. Various aspect ratio, volume fraction of polyvinyl alcohol fibre (PVAF), and various water-binder ratio were employed to prepare a total of 26 groups of fibre reinforced alkali-activated composite (FRAAC). The influence of PVAF fibre factor (product of fiber volume fraction and length-diameter ratio) on flowability, compactness, strength, and crack fractal dimension of FRAAC was researched. The influence of water-binder ratio on the plastic viscosity of FRAAC was more significant than that on the yield stress. When fibre factor was lower than critical value of 150, the influence of fibres could be overlooked. The reason was that the space between fibres was distant, so the flowability of FRAAC was not impacted by PVAF. At this time, fibres were challenging to restrict the cracks in matrix and increase their mechanical properties. When fibre factor was higher than critical value 150 and lower than density packing value 450, the flexural strength, compressive strength and crack fractal dimension of FRAAC were considerably enhanced, and the FRAAC could still flow easily under dead weight. When fibre factor were above 450, noteworthy fibre balling considerably decreased the flowability, leading to poor solidity and reduced compressive strength. Hence, the ideal content of PVAF in alkali activated composite is between 150/(l/d) and 450/(l/d).

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聚乙烯醇纤维增强碱活化复合材料的保鲜和硬化性能

纤维可以提高水泥基复合材料的力学性能，但也会降低其可加工性。然而，纤维含量和长径比对碱活化材料的定量影响尚不清楚。采用不同的长径比、聚乙烯醇纤维(PVAF)的体积分数和不同的水胶比，共制备了26组纤维增强碱活化复合材料(FRAAC)。研究了PVAF纤维因子(纤维体积分数与长径比的乘积)对FRAAC的流动性、致密性、强度和裂纹分形维数的影响。水胶比对FRAAC塑性粘度的影响大于对屈服应力的影响。当纤维因子低于临界值150时，可以忽略纤维的影响。原因是纤维之间的间距较远，因此PVAF不会影响FRAAC的流动性。此时，限制纤维在基体中的裂纹并提高其机械性能是一项挑战。当纤维因子高于临界值150，低于密度堆积值450时，FRAAC的抗折强度、抗压强度和裂纹分形维数均有显著提高，且FRAAC在自重下仍能很好地流动。当纤维系数大于450时，明显的纤维成球性明显降低，导致固体性差，抗压强度降低。因此，碱活化复合材料中PVAF的理想含量在150 ~ 450/(l/d)之间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Renewable Materials Materials Science, Composites; Polymer Science; Green & Sustainable Science & Technology-

CiteScore

4.10

自引率

0.00%

发文量

125

期刊介绍： This journal publishes high quality peer reviewed original research and review articles on macromolecules and additives obtained from renewable/biobased resources. Utilizing a multidisciplinary approach, JRM introduces cutting-edge research on biobased monomers, polymers, additives (both organic and inorganic), their blends and composites. JRM showcases both fundamental aspects and applications of renewable materials. The fundamental topics include the synthesis and polymerization of biobased monomers and macromonomers, the chemical modification of natural polymers, as well as the characterization, structure-property relationships, processing, recycling, bio and environmental degradation and life cycle analysis of the ensuing materials, in view of their potential applications. Within this sustainability approach, green chemistry processes and studies falling within biorefinery contexts are strongly favored.