Name: preparation of aligned steel fiber reinforced cementitious composite and its flexural behavior
Uploaded: 2018-06-27T12:30:00
Description: Watch this Scientific Journal Video about Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior at JoVE.com

作者感谢中国国家自然科学基金 (51578208 号赠款)、河北省自然科学基金 (批准号:) 的财政支持。E2017202030 和 E2014202178), 河北省大学科技研究重点项目 (批准号:ZD2015028)。

1. 电磁磁场设置
注: 磁场是由一个空心腔的螺线管产生的。该装置是一个聚对苯二甲酸 (PBT) 板螺线管骨架盘绕4-6 层搪瓷绝缘铜线和包装的塑料绝缘层保护 (图 1)。将线圈连接到直流后, 线圈中的电流在螺线管腔内产生一个均匀的电磁场, 具有固定方向和恒定的磁感应强度。使用磁场将钢纤维与新鲜砂浆对齐, 并准备 ASFRC 试样。在这项研究中, 我们准备了150?...

<ol>
	<li>Zollo, R. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fiber-reinforced+concrete:+an+overview+after+30+years+of+development.">Fiber-reinforced concrete: an overview after 30 years of development.</a> Cem. Concr. Compos. 19 (2), 107-122 (1997).</li><li>Bentur, A., Mindess, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Fiber reinforced cementitious composites. , (2014).</li><li>Deeb, R., Karihaloo, B. L., Kulasegaram, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reorientation+of+short+steel+fibres+during+the+flow+of+self-compacting+concrete+mix+and+determination+of+the+fiber+orientation+factor.">Reorientation of short steel fibres during the flow of self-compacting concrete mix and determination of the fiber orientation factor.</a> Cem. Concr. Res. 56 (1), 112-120 (2013).</li><li>Soroushian, P., Lee, C. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Distribution+and+orientation+of+fibers+in+steel+fiber+reinforced+concrete.">Distribution and orientation of fibers in steel fiber reinforced concrete.</a> ACI Mater. J. 87 (5), 433-439 (1990).</li><li>Sebaibi, N., Benzerzour, M., Abriak, N. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Influence+of+the+distribution+and+orientation+of+fibres+in+a+reinforced+concrete+with+waste+fibers+and+powders.">Influence of the distribution and orientation of fibres in a reinforced concrete with waste fibers and powders.</a> Constr. Build. Mater. 65 (1), 254-263 (2014).</li><li>Lee, C., Kim, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Orientation+factor+and+number+of+fibers+at+failure+plane+in+ring-type+steel+fiber+reinforced+concrete.">Orientation factor and number of fibers at failure plane in ring-type steel fiber reinforced concrete.</a> Cem. Concr. Res. 40 (5), 810-819 (2010).</li><li>Shen, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effect+of+compaction+methods+on+fibre+orientation,+flexural+strength+and+toughness+of+steel+fiber+reinforced+concrete.">Effect of compaction methods on fibre orientation, flexural strength and toughness of steel fiber reinforced concrete.</a> J. of the Chinese Ceramic Society. 12 (1), 21-31 (1984).</li><li>Bayer, A. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Process+for+producing+a+prepreg+with+aligned+short+fibres.">Process for producing a prepreg with aligned short fibres.</a> US patent. , (1988).</li><li>Arman, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Building+material,+especially+concrete+or+mortar,+contains+magnetically+or+electrically+aligned+parallel+fibers.">Building material, especially concrete or mortar, contains magnetically or electrically aligned parallel fibers.</a> US patent. , (1975).</li><li>Yamamoto, T., Gasawara, N., Ohashi, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+construction+method+and+directional+dispersion+of+steel+fiber+reinforced+concrete.">The construction method and directional dispersion of steel fiber reinforced concrete.</a> Advances in Science and Technology of Water Resource. (4), 188-197 (1983).</li><li>Xu, X. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+type+of+steel+fiber+reinforced+concrete.">A new type of steel fiber reinforced concrete.</a> Architecture Technology. 20 (4), 240-241 (1993).</li><li>Rotondo, P. L., Weiner, K. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Aligned+steel+fibers+in+concrete+poles.">Aligned steel fibers in concrete poles.</a> Con. Int. 8 (12), 22-27 (1986).</li><li>Michels, J., Gams, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preliminary+study+on+the+influence+of+fibre+orientation+in+fibre+reinforced+mortars.">Preliminary study on the influence of fibre orientation in fibre reinforced mortars.</a> Gradevinar. 68 (8), 645-655 (2016).</li><li>Mu, R., Li, H., Qing, L., Lin, J., Zhao, Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Aligning+steel+fibers+in+cement+mortar+using+electro-magnetic+field.">Aligning steel fibers in cement mortar using electro-magnetic field.</a> Constr. Build. Mater. 131 (1), 309-316 (2017).</li><li>Jones, D. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> The theory of electromagnetism. , (1964).</li><li>Liu, J., Li, C., Liu, J., Cui, G., Yang, Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Study+on+3D+spatial+distribution+of+steel+fibers+in+fiber+reinforced+cementitious+composites+through+micro-CT+technique.">Study on 3D spatial distribution of steel fibers in fiber reinforced cementitious composites through micro-CT technique.</a> Constr. Build. Mater. 48 (2), 656-661 (2013).</li><li>Schnell, J., Schladitz, K., Schuler, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Direction+analysis+of+fibres+in+concrete+on+basis+of+computed+tomography.">Direction analysis of fibres in concrete on basis of computed tomography.</a> Betonund Stahlbetonbau. 105 (2), 72-77 (2010).</li><li>Wuest, J., Denari&#233;, E., Br&#252;hwiler, E., Tamarit, L., Kocher, M., Gallucci, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tomography+analysis+of+fiber+distribution+and+orientation+in+ultra+high-performance+fiber+reinforced+composites+with+high+fiber+dosages.">Tomography analysis of fiber distribution and orientation in ultra high-performance fiber reinforced composites with high fiber dosages.</a> Experimental Techniques. 33 (5), 50-55 (2009).</li><li>. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> JGJ/T70-2009 Chinese standard for test method of performance on building mortar. , (2009).</li><li>Roussel, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Understanding the Rheology of Concrete. , (2012).</li><li>Roussel, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Steady+and+transient+flow+behaviour+of+fresh+cement+pastes.">Steady and transient flow behaviour of fresh cement pastes.</a> Cem. Concr. Res. 35 (9), 1656-1664 (2005).</li></ol>

本研究开发的电磁螺线管有一室测量250×250×750毫米, 不能容纳全尺寸结构元素。虽然会议厅的大小限制了设置的应用, 本文提出的概念和协议将激励进一步开发一个完整的尺寸设置, 制造 ASFRC 元素, 特别是预制元件。
达到适当粘度的新鲜砂浆是控制 ASFRCs 质量的关键因素, 因为钢纤维的对准是由需要克服新砂浆粘性阻力的磁力驱动的。粘性电阻受新砂浆粘度的制约。砂浆的粘度...

钢纤维掺入混凝土是克服脆性的固有弱点, 提高混凝土抗拉强度的有效途径1。在过去的几十年中, 钢纤维混凝土已被广泛的研究和广泛应用于该领域。钢纤维混凝土在抗裂性、抗拉强度、断裂韧性、断裂能等方面优于混凝土2在钢纤维混凝土中, 钢纤维随机分散, 从而均匀分散纤维在各个方向的增强效率。然而, 在一定的荷载条件下, 混凝土中只有部分钢纤维对结构构件的性能有贡献, 因为纤维的增强效率要求它们与主拉应力在结构。例如, 当钢纤维混凝土中含有随机分布的钢纤维来制备梁时, 某些钢纤维, 特别是与主拉应力方向平行的钢筋, 将对提高效率, 而垂直于主拉应力方向的那些将不会对提高效率作出贡献。因此, 寻找一种将钢纤维与混凝土主要拉应力方向相对准的方法, 是实现钢纤维最高加固效率的必要条件。
定位效率因子, 定义为沿拉伸应力方向的投影长度与纤维实际长度的比值, 通常用来表示钢筋纤维3、4 的增强效率..根据这一定义, 与拉伸应力方向一致的纤维取向效率系数为 1.0;与拉伸应力垂直的纤维是0。倾斜纤维在0和1.0 之间有一个取向效率因素。分析结果表明, 混凝土中随机分布钢纤维的取向效率系数为 0.4054, 而普通钢纤维混凝土的试验范围为0.167 到 0.5005,6.显然, 如果混凝土中的短钢纤维对齐, 并且与拉伸应力方向相同, 则钢纤维将具有最高的加固效率, 试样的拉伸性能最佳。
自二十世纪八十年代以来, 一些成功的尝试准备对齐钢纤维钢筋混凝土。在 1984年, 沈7在铸钢纤维增强水泥基复合材料 (纤维混凝土) 梁的底层应用了一个电磁场, x 射线检测分析表明, 钢纤维的排列良好。在 1995年, 拜耳8和 Arman9获得专利的方法, 以制备对齐钢纤维钢筋混凝土使用磁场。山本等。10考虑了钢纤维在混凝土中的取向主要受铸造方法的影响, 并试图通过保持新混凝土从恒定方向向模板流动的方式获得对齐钢纤维混凝土。徐11试图将钢纤维从一个恒定的方向喷出, 使其在喷射混凝土中保持一致。圣乔瓦尼罗和维纳12试图用离心铸造的方式使长钢纤维的混凝土极。试验研究表明, 钢纤维混凝土与随机分布的钢纤维混凝土相比具有明显的优越性。
最近, 米歇尔斯等。13和亩等。14已成功开发了一组采用电磁场的排列钢纤维增强水泥基复合材料 (ASFRCs)。在这些研究中, 各种螺线管被用来提供一个统一的磁场, 使钢纤维在不同尺寸的砂浆试样中进行对准。螺线管有一个空心长方体室, 可以容纳预定大小的样品。当电磁线圈连接到直流 (DC), 一个统一的磁场是在腔内创建一个固定的方向, 这与螺线管的轴对齐。根据电磁15原理, 磁场可以驱动铁磁纤维在新鲜砂浆中旋转和对准。砂浆的适当的可加工性对于允许钢纤维在新鲜砂浆中旋转是至关重要的。高粘度可能会导致砂浆中钢纤维的对准困难, 而低粘度可能导致纤维的离析。
本文介绍了 ASFRC 试样的制备细节, 并对 ASFRC 和钢纤维混凝土的弯曲性能进行了试验研究。预计 ASFRC 比钢纤维混凝土具有更高的抗弯强度和韧性。因此, ASFRC 有可能比钢纤维混凝土在抗拉应力和抗裂性能方面具有优越性, 如用作覆盖混凝土、路面等.
利用弯曲试验后的断裂试样, 通过观测裂隙剖面, 利用 X 射线扫描计算机层析分析16、17 , 研究了试样中钢纤维的取向。,18. 报告了 ASFRCs 的力学性能, 包括其弯曲强度和韧性, 并与非电磁处理的 SFRCs 进行了比较。

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr >
			<td >Cement</td>
			<td >Tangshan Jidong Cement Co., Ltd.</td>
			<td >P&#215;O 42.5</td>
			<td >Oridnary Portland Cement</td>
		</tr>
		<tr >
			<td >Sand</td>
			<td ></td>
			<td >River sand</td>
			<td>Fineness modulus is 2.4</td>
		</tr>
		<tr >
			<td >Superplasticizer</td>
			<td >Subote New Materials Co., Ltd.</td>
			<td >PCA-III</td>
			<td>Polycarboxylated type, water reducing ratio is 35%</td>
		</tr>
		<tr >
			<td >Steel fiber</td>
			<td >Tianjin Hengfeng Xuxiang New Metal Materials Co., Ltd.</td>
			<td >Round straight</td>
			<td>Diameter 0.5mm, length 25mm</td>
		</tr>
	</tbody>
</table>

preparation of aligned steel fiber reinforced cementitious composite and its flexural behavior

这项工作的目的是提出一种方法, 灵感的方式, 罗盘针保持一致的方向, 在地球的磁场的作用下, 制造的水泥基复合材料加强了对齐钢纤维。将均匀的电磁场应用于含短钢纤维的新鲜砂浆中, 通过将短钢纤维与磁场相对准, 使钢纤维增强水泥基复合材料 (ASFRC) 制备。通过对断裂剖面中钢纤维的计数和 X 射线计算机断层分析, 对钢纤维在硬化 ASFRC 中的对准程度进行了评价。这两种方法的结果表明, ASFRC 中的钢纤维高度排列, 而非磁处理复合材料中的钢纤维是随机分布的。所对的钢纤维具有更高的增强效率, 因此复合材料的抗弯强度和韧性明显增强。因此, ASFRC 比钢纤维混凝土更优越, 它能承受较大的拉应力, 更有效地抵御开裂。

由三点弯曲试验确定的 ASFRCs 和 SFRCs 的弯曲强度如图 5所示。ASFRCs 的抗弯强度高于所有纤维用量的 SFRCs。ASFRCs 的抗弯强度分别为0.8%、1.2%、2.0% 纤维体积分数的88%、71% 和57% 以上的 SFRCs。这些结果意味着, 对齐钢纤维比随机分布的钢纤维更有效地加强胶凝基体。
图 6显示?...

Watch this Scientific Journal Video about Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior at JoVE.com

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior

定向钢纤维增强水泥基复合材料的制备及其弯曲性能研究

本协议描述了一种采用均匀电磁场制造对齐钢纤维增强水泥基复合材料的方法。对钢纤维增强水泥基复合材料具有优异的力学性能。

The aim of this work is to present an approach, inspired by the way in which a compass needle maintains a consistent orientation under the action of the ...

Research

JoVE Journal

Engineering

Mechanical Expansion of Steel Tubing as a Solution to Leaky Wellbores

钢管机械性扩张为解决井眼漏

Wellbore cement, a procedural component of wellbore completion operations, primarily provides zonal isolation and mechanical support of the metal pipe ...

科研

工程学

A Testing Platform for Durability Studies of Polymers and Fiber-reinforced Polymer Composites under Concurrent Hygrothermo-mechanical Stimuli

一个测试平台为聚合物的耐久性研究，并在同期Hygrothermo机械刺激纤维增强聚合物复合材料

The durability of polymers and fiber-reinforced polymer composites under service condition is a critical aspect to be addressed for their robust designs ...

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

基于多尺度复合材料的增强与石墨烯纳米片应变传感

The electrical response of NH2-functionalized graphene nanoplatelets composite materials under strain was studied. Two different manufacturing methods are ...

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

不锈钢滑面的制备及高温抗粘接性能研究

Anti-adhesion surfaces with high-temperature resistance have a wide application potential in electrosurgical instruments, engines, and pipelines. A ...

Installation Method to Enhance Quality Control for Fiber Reinforced Polymer Spike Anchors

提高纤维增强聚合物穗锚质量控制的安装方法

Fiber reinforced polymer (FRP) anchors are a promising way to enhance the performance of externally-bonded FRPs applied to existing structures, as they ...

Applicability Analysis of Assessment Methods for Morphological Parameters of Corroded Steel Bars

钢筋形态参数评价方法的适用性分析

The irregular and uneven residual sections along the length of a corroded steel bar substantially change its mechanical properties and significantly ...

Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence

胶孔溶液的表达及其化学成分和电阻率的 X 射线荧光分析

The goal of this method is to determine the chemical composition and electrical resistivity of cementitious pore solution expressed from a fresh paste ...

Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

通过 DP780 钢上的摩擦搅拌点焊生成圈接头

Friction stir spot welding (FSSW), a derivative of friction stir welding (FSW), is a solid-state welding technique that was developed in 1991. An industry ...

Artificial Thermal Ageing of Polyester Reinforced and Polyvinyl Chloride Coated Technical Fabric

聚酯增强和聚氯乙烯涂层技术织物的人工热老化

Architectural fabric AF9032 has been subjected to artificial thermal ageing to determine changes of the material parameters of the fabric. The proposed ...