新疆公路盐渍土路基盐胀力的数值模拟分析

针对新疆盐渍土地区公路盐胀造成路面大面积纵向开裂的病害现状,提出盐渍土路基盐胀力的数值模拟方法,采用FLAC数值模拟软件,以S310线的病害为依托,模拟盐胀力的大小及其在路基中的传力特性。通过分析路基断面不同高度的水平应力分布规律,提出把公路路面的水平位移与盐胀力的比值作为盐渍土路基的水平盐胀率的概念。     

提高石灰土路面结构层工程质量的基本控制措施

根据石灰土强度形成原理和主要影响因素,结合我市采用石灰土路面结构层的实践经验,提出了提高石灰土路面结构层工程质量的基本控制措施。     

21世纪面向汽车工业的磷化技术

简述了20世纪磷化技术所发生的变化。进入21世纪,为了不断提高汽车车身的防腐技术,要求进一步缩短磷化工艺时间、降低工艺成本,并使锌盐磷化技术更具环保性。介绍了一种全新的能够满足汽车制造商最新要求的磷化技术,并且讨论了锌盐磷化技术的未来发展趋势。     

强风化泥灰岩填料试验研究

泥灰岩很容易降解,作为填方材料存在一定的风险,需要充分掌握其工程特性。针对国外某条高速公路实际情况,研究泥灰岩的工程力学特性和作为填料的可行性,通过室内外试验,研究材料的压实性能,确定施工工艺和施工参数,为设计和施工提供充分的依据。     

路面雷达在沥青路面防排水能力方面的检测应用

针对沥青路面结构,结合广东某高速公路实际测试结果,利用路面雷达的测试原理,对比检测了不同路段及其雨水作用前后路面对雷达波的反射异同。分析得出,路面雷达可快速和较为准确地测试路面雨天前后的排水、饱水状况,进而预估路面的均匀性,提出有针对性的预防养护措施。     

车用质子交换膜燃料电池水含量估计方法综述

质子交换膜燃料电池（Proton Exchange Membrane Fuel Cell,PEMFC）进行水管理的目的,是保证电池内部始终处于水平衡状态,实现长期稳定工作并且保持最高输出性能。精细的水管理策略依赖于电池内部的水含量状态准确量化的评估方法。总结归纳了目前国内外PEMFC水含量的估计方法,概括为基于模型以及基于试验的两种方法;在对比分析现有估计方法优缺点的基础上,提出进一步研究的重点及方向。对车用PEMFC水含量在线估计的研究具有重要的理论基础及工程应用价值。     

Degradation of bond strength and deformation between TRC-confined seawater sand concrete and BFRP bars under chloride corrosion environment

The interfacial bonding performance between seawater sand concrete and basalt fiber reinforced polymer (BFRP) bars were tested under different textile reinforced concrete (TRC) confinement layers, confinement sequences and chloride salt dry-wet cycles. The results show that TRC confinement can change the failure mode of the specimen and improve the ductility of specimens. With the increase of corrosion age, compared with the specimens with the same restrained layers in the conventional environment, the ultimate bond strength of restrained specimens before corrosion gradually decreases, and the slip value when reaching the ultimate bond strength also slightly decreases. The bond strength of the pre-restrained corroded specimens has the same development trend. Based on the bond-slip model of deformed steel bars and concrete proposed by Eligehansen for the first time in 1983—BPE model, under the control of TRC confinement and corrosion age, the relationship between the TRC confinement layer and the ultimate bond strength and slip of seawater sand concrete and BFRP steel bar is established. By fitting and predicting the ultimate bond strength, corresponding slip value, and corrosion age control of different TRC confinement layers, it is found that the confinement effect will not be significantly improved when the confinement layers exceed 4 layers. Under long-term chloride corrosion, the failure mode of the specimen may still change into splitting failure when the number of restrained layers is small.