Interfacial performance and durability of textile reinforced concrete

The aim of this work is to understand the bonding characteristics between various yarn structures and cement matrix which was studied by yarn pull out test. In this work, the effect of accelerated ageing under alkaline environment for different types of fibers i.e. Basalt, Polypropylene, Polyester, and Jute is studied in order to comparatively evaluate their weight loss and reduction of tensile strength. SEM images are also used for studying the morphology of alkali degraded fibers. Material characterization can also be done by FTIR, XRD, ICP, Zeta potential, and UV spectrometer.     

非织造布增强复合材料的制备与力学分析

分别采用手糊法、真空袋法和真空辅助成型法制备了非织造布增强不饱和聚酯树脂复合材料 ;宏观上对这三种复合材料的拉伸、弯曲、冲击等力学性能进行了测试 ,并加以比较 ;微观上利用电镜扫描图分析了复合材料的破坏形式和机理。     

激光切割纺织面料的数据库设计与应用

激光切割纺织面料时要对不同加工对象调节激光参数的设置,而精确预测或自动获得工艺参数相当困难.通过系统实验获取大量工艺参数,在不同工艺的激光功率、切割速度等参数设定下,量化确定激光切割系统的切割精度.建立了基于实验的最佳激光切割工艺参数数据库,使得有效范围内的加工能自动获得切割参数.对常用的纺织面料测定切割图形精度进行误差分析,结果表明,激光切割效果完全满足服装加工制造的要求,实现了激光切割纺织面料的自动化.     

Characterization and analysis of in-plane shear behavior for glass warp knitted non-crimp fabrics based on bias extension experiment

Abstract

In this article, the in-plane shear rigidity modulus of five commercially available fabrics of glass warp knitted non-crimp fabrics (WKNCFs) was experimentally investigated by uniaxial bias extension test (UBE). The aim was to characterize and compare the shear behavior of relatively high areal density fabrics, while these fabrics could have good potential to be widely used in the composites field. In this work, five fabrics were included: a uni-directional, 2 bi-axial, and 2 tri-axial fabrics. To characterize the shear properties, stress equations were established to deliver the in-plane modulus of shear rigidity as a function to shear angle. The fabric structure of uni-axial or multi-axial had a different influence on the shear resistance mechanics along with the influence of the stitching pattern; both were also presented in the comparison of deformation mechanisms. It was found that the shear behavior of all five fabrics was dissimilar to each other.     

纬编针织增强复合材料的拉伸性能

在电脑横机上用玻璃纤维编织4种不同结构的针织物,作为纬编针织增强复合材料的增强体。采用VARTM工艺复合加工,对这4种纬编针织增强复合材料的纵、横向拉伸性能进行测试,并对拉伸应力与应变特征曲线进行分析;阐述集圈、浮线对纬编针织增强复合材料拉伸性能的影响。结果表明:取向度和拉伸方向上受力纱线根数是影响这4种结构增强复合材料拉伸性能的主要因素;复合材料的破坏形式说明玻璃纤维针织物增强体与树脂结合良好,有潜在的应用价值。     

Modification of cotton fabric for textile dyeing: industrial mercerization versus gamma irradiation

The current research is intended to investigate the effect of gamma radiation on the cotton fabric and compare the dyeability of gamma irradiated fabric with that of chemically mercerized fabric using reactive dye, Reactive Violet H3R. The gray cotton fabric samples were desized and bleached, before being mercerized or irradiated, followed by dyeing with reactive dye. The cotton fabric was exposed to variable absorbed doses of 2–10 kGy. The color strength values at various levels of temperature, pH, dyeing time, and salt concentration were evaluated using optimal conditions of mercerization and gamma-ray treatment. The comparison of color strength values for the mercerized and the gamma irradiated cotton fabric showed that the irradiated fabric had high color strength at 60 °C using dye bath of pH10 in the presence of 6 g/L of exhausting agent while dyeing for 40 min. Both mercerization and irradiation increased the surface area of fibers that substantially elevated the dyeing performance and fastness properties.     

我国纺织面料改进方向探讨

介绍了技术发达国家纺织面料的发展趋势，分析了国产纺织面料与国际先进水平的差距，指出国内纺织面料生产企业只有更新观念，提高生产工艺技术，大力推广应用差别化纤维，加强印染后整理工艺技术的研究，才能提升国产纺织面料的档次。     

带织物层叠缠绕玻璃钢管的设计与缠绕成型

采用仿形织造方法织造带织物,并用该带织物层叠缠绕生产玻璃钢管道是一种新方法。在缠绕成型过程中,为了使管道的成型性良好,需要对缠绕角度、经纱长度、织物幅宽等进行设计,同时选择成型效果好的织物组织。试验结果表明:圆直管道预成型织物的缠绕角取决于织物幅宽、缠绕层数和管道直径;织物的经纱长度不等,按照一定的规律随缠绕层数的增加而增加;2/2斜纹组织织物的成型效果较好。     

涤纶增强混凝土的性能研究

采用涤纶工业丝和相应的废弃的涤纶工业丝作混凝土的增强纤维,分别选择纤维的长度为20、30 mm和纤维的掺量为0.5、1.0、1.5 kg/m3,按国标要求制作试样并进行标准养护后,对增强混凝土的抗裂性能、抗压性能、劈裂抗拉性能和弹性模量进行测试和分析,结果表明纤维增强混凝土的上述力学性能均有所改善,试样受力破坏后不碎裂;并且随着纤维长度和掺量的增加,抗压强度和劈裂抗拉强度提高;回收涤纶与新涤纶的情况大体类似,这给废弃涤纶的回收再利用和节约资源、保护环境提供了途径。不论是涤纶还是回收涤纶,长度为30 mm、掺量为1.5 kg/m3的试样表现出最优的力学性能。     

等离子体处理对芳砜纶机织物力学性能的影响

为改善芳砜纶机织物的服用性能,对其进行了低温等离子体处理.对处理前后织物力学性能指标的测试数据作数理统计分析表明,处理后织物的力学性能有一定程度降低,但不影响其使用性能;除悬垂性外,处理工艺中因素的各水平对其他力学性能没有显著影响.     

Correlation between clothing air gap space and fabric mechanical properties

To investigate the distribution of clothing air gap layers, clothes with the same pattern but different fabrics were put on a standard scan model. The [TC]² NX-16 three-dimensional (3D) body scanning technique was used to collect point cloud data and the overall 3D visualization model of clothing air gaps was represented in a novel way through computer graphics processing. The volumes of air gap space were calculated. The main fabric mechanical properties were investigated and the relationship among them was analyzed by stepwise regression. The results demonstrated a close relationship between clothing air gap space and fabric mechanical properties. The volumes of air gap space were significantly positively correlated with stiffness-bending length and warp density and significantly negatively correlated with drape-crest angle uniformity. The conclusion could play a role in predicting and controlling the clothing design process, especially the material design process of clothing.     

硅藻土改性黏胶纤维家纺面料的设计开发

以本白色硅藻土改性黏胶纤维和淡黄色原色竹浆纤维为原料设计开发一款特色家纺面料。纺纱工艺为精梳紧密纺,交织比例为80/40;面料颜色为黄白相间,采用本色原纱交织,不经过纱线和面料染色工序;花型分为大提花和小提花两类。不同花型与黄白色彩搭配设计的整体效果高雅精致、环保、舒适。经测试,面料成品符合婴幼儿及儿童纺织产品安全技术规范A类标准。     

Evaluating the fabric performance and antibacterial properties of 3-D piezoelectric spacer fabric

The increasing need of on-demand power for enabling portable low-power devices and sensors has necessitated work in novel energy harvesting materials and devices. In a recent work, we demonstrated the production and suitability of three-dimensional (3-D) spacer all fibre piezoelectric textiles for converting mechanical energy into electrical energy for wearable and technical applications. The current work investigates the textile performance properties of these 3-D piezoelectric fabrics including porosity, air permeability, water vapour transmission and bursting strength. Furthermore, as these textiles are intended for wearable applications, we have assessed their wear abrasion and consequently provide surface resistance measurements which can affect the lifetime and efficiency of charge collection in the piezoelectric textile structures. The results show that the novel smart fabric with a measured porosity of 68% had good air (1855 l/m²/s) and water vapour permeability (1.34 g/m²/day) values, good wear abrasion resistance over 60,000 rotations applied by a load of 12 kPa and bursting strength higher than 2400 kPa. Moreover, the antibacterial activity of 3-D piezoelectric fabrics revealed that owing to the use of Ag/PA66 yarns, the textiles exhibit excellent antibacterial activity against not only Gram-negative bacteria E. coli but they are also capable of killing antibiotic methicillin-resistant bacteria S. aureus.     

织物组织结构对机织物力学性能的影响

纺织品组织结构对织物的外观和应用性能具有普遍的适用性,织物的最终用途在很大程度上取决于所用的材料及其物理特性。因此,织物的结构参数直接决定了织物的性能。研究了不同组织结构对织物力学性能(包括拉伸性能、撕裂性能和耐磨性能)的影响,主要探讨了平纹、斜纹和方平组织对织物力学性能的影响。     

蜂窝组织棉织物增强聚氨酯复合材料的力学性能

为使蜂窝织物复合材料得到更为合理的应用,采用相同的原料和经纬密度织制不同蜂窝类组织织物,以聚氨酯为基体制备蜂窝棉织物/聚氨酯复合材料,并测试不同蜂窝组织复合材料的拉伸强度、剥离强度和冲击强力等,分析不同组织对复合材料力学性能的影响。结果表明:不同循环蜂窝组织织物对复合材料的力学性能有较大的影响,复合材料的断裂强力、剥离强度和冲击强力随着蜂窝尺寸的变小先增大后减小,断裂伸长率逐渐减小,当组织循环数为5和6时,复合材料各项力学性能较好。     

钢筋混凝土梁结构状况的系统识别方法

基于静载试验结果,运用系统识别原理对钢筋混凝土梁分段截面抗弯刚度进行系统识别,通过比较截面抗弯刚度的变化,来评价钢筋混凝土梁结构状况.结果表明:该方法可以较好地满足实际工程钢筋混凝土梁结构状况评价的要求.     

玄武岩纤维机织针织复合织物增强复合材料的弯曲性能

根据新型的机织针织复合织物的结构特点,分别选用不同线密度的高强高模玄武岩纤维作为经纱、纬纱和针织纱编织这种织物,以其作为增强体,采用VARTM工艺制作了玄武岩纤维/乙烯复合材料。为提供该新型织物增强复合材料的应用依据,测试了复合材料的横向、纵向和斜向弯曲性能,并对各个方向的弯曲载荷-挠度特征曲线及其弯曲断裂形态进行了分析。研究结果表明：这种复合材料具有较好的轴向弯曲性能,横向和纵向的弯曲性能均优于斜向,其弯曲断裂都表现一定的塑性,弯曲能量基本相近。     

Bending load capacity of carbon fiber reinforced concrete beams as a function of fiber performance index (FPI)

Over the past several decades, textile reinforced concrete (TRC) materials have been developed due to their superior mechanical properties, corrosion resistance, lightweight application, and high load-bearing capacity. In this study, the effect of three main factors on bending load capacity of carbon fiber reinforced concrete (CFRC) beams is investigated; the number of reinforcements (carbon-fiber rovings), penetration of the cement within the fibers, and the post-cracking factor. The second and third factors are defined as the fiber performance index (FPI) for evaluating bending load capacity of CFRC beams. The best FPI for a different number of reinforcements was estimated using empirical values of bending load capacity of CFRC beams. The results were indicative of the efficiency and accuracy of the proposed FPI for a wide range of roving numbers, namely 2–24 with 800 tex as the titer. The post-cracking factor was suggested as 2.67 for TRCs and CFRCs materials, which are reinforced by rovings. In order to improve the FPI, the roving was impregnated partially with epoxy, which increased the maximum load capacity and displacement of the beams up to 26.68 and 23.24%, respectively. In addition, the impacts of roving numbers, the first factor, on the failure mode, load-bearing capacity, ductility, and toughness of the CFRC beams were investigated.     

篷网基布孔眼结构形式与力学性能的关系

以涤纶纤维为原料,在织物密度、纱线线密度等参数相同的情况下,分别织制不同的花式透孔织物,得到孔眼结构形式不同的织物,然后进行拉伸强力实验和撕裂强力实验,确定最佳机械强力下的织物孔径分布参数,从而优选出最佳孔眼结构的篷网基布的织物。     

混凝土结构钢筋锈蚀的现场检测技术述评

比较了半电池电位法、混凝土电阻检测法、线性极化法和交流阻抗法等几种常用的现场检测方法.结果表明:半电池电位法可准确确定钢筋锈蚀区域,适合现场评定混凝土中钢筋锈蚀程度;线性极化法能相对可靠给出钢筋锈蚀速率,且简便易行,目前较适合混凝土中钢筋锈蚀速率的现场检测.