机场环氧沥青混凝土加铺复合道面荷载应力分析

为了探究环氧沥青混凝土加铺层这种机场道面修建技术,分析复合道面结构参数对荷载应力的影响,利用ANSYS建立了机场复合道面三维有限元模型,计算荷载为SU-27飞机荷载,选取了环氧沥青加铺层顶面荷载应力、底面对应接缝处应力、底面对应接缝处弯沉值以及旧道面板最大拉应力为考察指标,分别计算了各结构参数对荷载应力的影响,并利用正交设计分析了各结构参数对荷载应力影响的显著性。结果表明:加铺层厚度、加铺层模量、基础模量与考察指标都显著相关,应作为机场环氧沥青加铺层设计的主要分析指标,因此,在设计环氧沥青加铺层时要选取合理的加铺厚度,并对基础进行必要的检测,采取相应的技术措施进行处理。     

旧水泥混凝土路面压浆稳板关键技术研究

旧水泥混凝土路面加铺沥青层是一种极为普遍的刚柔复合路面结构,如旧水泥混凝土路面脱空处治不当,将导致反射裂缝等病害过早出现于刚柔复合路面结构内。为降低水泥混凝土路面板脱空对路面结构路用性能造成的影响程度,在加铺沥青层前,为有效防治水泥混凝土板底脱空病害,可选取压浆技术进行施工。为此,该文结合具体工程案例,对旧水泥混凝土路面压浆稳板关键技术进行了探讨。     

水泥混凝土路面加铺沥青层前的路况调查

旧水泥混凝土状况评定目的是为了了解路面的物理或结构状况,以便确定需采取修复措施的路段和方案,制定养护政策和编制养护计划,并为补强设计提供依据和数据。因此,改造前对旧水泥混凝土路面的损坏情况和结构状况进行正确的评价是加铺沥青层成功的保证。     

CRC＋AC复合式沥青路面温度应力研究

连续配筋混凝土复合式沥青路面结构（CRC＋AC）是沥青混合料与水泥混凝土材料的复合,以CRC板作为承重结构层,Ac层作为表面功能层的新型路面结构,既保留了普通混凝土路面加铺沥青面层高强耐久的优良特性,同时依靠纵向连续配筋,裂缝处传荷能力增强,连续平整的表面大大降低了沥青面层产生反射裂缝的概率,是重载交通长寿命路面结构的重要形式之一。在本研究中,采用有限元方法分析CRC＋AC复合式路面结构的温度应力状况,为结构设计提供参考。     

浅谈旧水泥路面上加铺沥青面层的施工要点

本文对旧水泥混凝土上加铺沥青混凝土面层改造旧水泥混凝土路面这一广泛使用且行之有效的工艺方法中支承路面的处理和沥青混凝土加铺层施工控制事项的经验积累,进行了详细的总结。本文有很强的实用价值和借鉴意义。     

沥青加铺层改造旧水泥砼路面技术探讨

旧水泥混凝土上加铺沥青混凝土面层,是改造旧水泥混凝土路面行之有效的方法。文章针对道路旧水泥混凝土加铺沥青面层的施工问题进行了探讨。     

旧水泥路面加铺沥青混凝土面层施工处理分析

旧水泥混凝土上加铺沥青混凝土面层,是改造旧水泥混凝土路面行之有效的方法之一。本文针对旧水泥路面加铺沥青混凝土面层施工处理进行了阐述。     

复合式路面加铺技术应用实例研究

混凝土路面加铺沥青面层,是改造旧水泥混凝土路面行之有效的方法之一,国内外对在旧水泥混凝土路面加铺沥青混凝土层的方法目前尚处于研究与试验阶段。通过对重庆忠县县城市政道路改造工程（二期）现场进行水泥混凝土路面现状详细调查、统计,对资料的进一步收集与损坏原因分析,结合目前国内外改性沥青、沥青混合料发展现状及水泥混凝土路面改造应用技术的推广,提出了项目路面改造中路面病害修复和复合式路面加铺的方案,对水泥混凝土路面加铺橡胶沥青面层的施工技术进行了系统研究,使项目在技术水平和综合效益等方面有所创新。     

沥青加铺层改造旧水泥砼路面施工方案

本文结合某公路养护改善工程,针对旧水泥混凝土路面加铺改造,运用新技术、新材料,对用沥青加铺层改造旧水泥混凝土路面的方法和理论作进一步的研究,力图找到符合国情、切实可行的改造措施。     

浅析旧混凝土路面修补改造措施

针对旧混凝土路面加铺改造,对用沥青加铺层改造旧水泥混凝土路面的方法和理论作进一步的研究,力图找到符合国情,切实可行的改造措施,以有效地改善旧混凝土路面的使用功能,提高道路标准。     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

Investigation of the Corrosion Behaviors of HVOF-Sprayed Carbide Cernet Coatings in Molten Al-Zn-Si Alloy Bath

In continuous hot-dip galvanization process the corrosion and chemical stability of the sink roll in the galvanizing bath are important problem which effects on the quality and productivity. In order to protect the sink roll the carbide cermet and/or ceramic coatings were deposited on the surface of the sink roll. The WC-, Cr3 C2-cermet coatings were deposited by high velocity oxygen fuel (HVOF) spray, respectively. The coating samples were immersed in molten Zn-alloy containing 50 wt % aluminum at 833 K for 24 hr and 144 hr, respectively. The inter-diffusion and inter-reaction of Zn, Al and elements in coating and corrosion behaviors of these coatings were investigated by XRD, SEM and EPMA etc. The corrosion mechanisms of the carbide cermet coatings and ceramic coatings in molten High Al-Zn-alloy were approached.     

Fundamental study of adhesion of ice to cooling solid surface (Discussion on influence of copper oxide layer on ice adhesion force)

In many situations, ice often adheres to a cooling solid surface, frequently causing serious accidents. It is critical to clarify the mechanism of ice adhesion to the cooling surface in order to prevent ice adhesion. In a past study, the shearing stresses of two kinds of test plates with a copper surface having the higher thermal conductivity were measured. The shearing stress corresponds to ice adhesion force. Both shearing stresses were significantly different; however, the cause remains unclear.Therefore, the present study focuses on an oxide layer as the main factor causing the difference of both shearing stresses; the influence of the oxide layer formed on shearing stress was discussed. And in the removal and reformation processes of the oxide layer, the time variation of the shearing stress was clarified. Moreover, the relationship between the state of the copper surface and the shearing stress was also clarified by surface analysis.     

＂Three Transformations＂ and Standardization

During his inspection in Henan Province in May, Chinese President Xi Jinping stressed to ＂push forward the transformation from China Speed to China Quality, from Made in China to Created in China, and from Chinese Products to Chinese Brand＂. The ＂Three Transformations＂ are the specific requirements and goal of China＇s national development in the context that market should play a decisive role in the allocation of resources.     

重塑标准推行格局 推动LED照明的普及（英文）

正When you are enjoying the green,energy-saving and healthy lighting of IKEA LED luminaire,you may not realize that most of IKEA’s LED bulbs are produced by the LED luminaire smart manufacturing system of Hangzhou Zhongwei Photoelectricity CO.,LTD(ZVISION).No longer enclosed in the laboratory,the product standards are brought into the factory workshop and even to the entire production process.Thus,the standards are promoted and applied in a favorable way by enterprises,benefitting consumers with high quality products.     

Chinese Experts Contribute to ISO＇s New Toy Standards

正The international standard,ISO 8124-6,Safety of toys–Part 6:Certain phthalate esters in toys and children’s products,was officially issued by ISO worldwide on August 15.It was the first time for Chinese experts to lead the ISO standard development in toys industry.The standard was drafted by a group of Chinese experts from SAC/TC for toys and relevant Chinese departments and finally completed by a dedicated international group of experts.ISO 8124-6 makes a substantive breakthrough in the aspects of the scope of toys,limitation of plasticizer types,control of test cost,accuracy of test,operation convenience,etc.,offering the operational guidance for toy manufactures and testing laboratories.     

SAC Delegation Visits AENOR and Signs Cooperation Agreements

正SAC Administrator Tian Shihong led the Chinese delegation to visit the Spanish Association for Standardization and Certification(AENOR)on September 15,2014.Mrs.Begona Cristeto,the Vice-Minister of Industry,Energy and Tourism of Spain,and Mr.Avelino Brito,the President and CEO of AENOR greeted the delegation.The two sides had a deep and friendly discussion on strengthening the cooperation between China and Spain in the standardization field and promoting the standardization work to support the development of economy and trade in the two countries.