Micro- and nanoparticle mineral coating for enhanced properties of carbon multifilament yarn cement-based composites
Micro- and nanoparticle mineral coating for enhanced properties of carbon multifilament yarn cement-based composites
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DOI：
10.1016/j.compositesb.2016.12.005
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发表时间：
2017-02-15
影响因子：
13.1
通讯作者：
Schroefl, Christof
中科院分区：
文献类型：
--
作者：
Nadiv, Roey;Peled, Alva;Schroefl, Christof
纺织品增强混凝土（Textile-Reinforced Concrete，TRC）的增强效率往往受到水泥制品对复丝内部纤维渗透性低的限制，导致复合材料因粘结强度低而过早失效。通常，将聚合物涂层施加到碳纱线上以改善其粘合性能。然而，这样的涂层对高温敏感，并且在许多情况下，还对潮湿和碱性环境敏感（老化），因此，复合材料不能根据预期来执行。本文提出了一种研究，旨在提高控制的碳复丝纱线的粘结水泥基基体的无机颗粒涂层的装置。碳复丝纱线浸渍微米和纳米二氧化硅填料和传统的环氧聚合物涂层纱线的拔出行为和微观结构形态进行了比较。微米二氧化硅填料涂层被证明是最有效的，提高了拔出强度和韧性，远远超出了纳米二氧化硅和环氧树脂涂层引起的效果。微二氧化硅涂层的上级性能归因于颗粒对纤维间空间的高度浸渍和二氧化硅颗粒的火山灰反应，促进了有益的纳米晶体产物在复丝纱线内的形成。纳米二氧化硅没有显示出相同的效果，这是由于在涂层的干燥过程中广泛的团聚和随后的涂层分割。尽管环氧聚合物有效地涂覆了纤维，但与通过使用微二氧化硅涂层获得的粘合强度相比，水泥水合产物到纱线中的低渗透导致了较差的粘合强度。可以得出结论，用矿物填料涂覆复丝纱线为改善TRC材料的性能提供了有效的选择。因此，建议使用火山灰颗粒，其分散良好并有效地分散纱线，填充在束空间中。(C)2016爱思唯尔有限公司版权所有
The reinforcing efficiency of Textile-Reinforced Concrete (TRC) is often limited by the low penetrability of the cement products into the inner fibers of the multifilament, leading to premature failure of the composite due to low bonding strength. Usually, polymer coatings are applied to carbon yarns to improve their bond properties. However, such coatings are sensitive to elevated temperatures and, in many cases, also to moist and alkaline environments (ageing) and, consequently, the composite material does not perform according to expectations. This paper presents an investigation aimed at improving control of the bonding of carbon multifilament yarn to a cement-based matrix by means of inorganic particle coatings. A carbon multifilament yarn was impregnated by micro- and nano-silica fillers and compared to conventional epoxy-polymer-coated yarns in terms of pullout behavior and microstructure morphology. The micro-silica filler coating proved to be the most efficient, enhancing both pullout strength and toughness, well beyond the effects induced by the nano-silica and epoxy coatings. The superior performance of the micro-silica coating is attributed to the high degree of impregnation of the inter-fiber space by the particles and to the pozzolanic reactions of the silica particles, promoting the formation of beneficial nanocrystalline products within the multifilament yarn. The nano-silica did not show the same effect due to extensive agglomeration and subsequent coating segmentation during the coating's drying process. Although the epoxy polymer effectively coated the fibers, the low penetration of cement hydration products into the yarn resulted in inferior bonding strength compared to that obtained by using the micro-silica coating. It may be concluded that the coating of multifilament yarns with mineral fillers offers an efficient option for improving the performance of TRC materials. As such, it is recommended to use pozzolan particles that disperse well and effectively impregnate the yarns, filling in the bundle spaces. (C) 2016 Elsevier Ltd. All rights reserved.