Advanced Materials Research Vol. 908

Abstract: Based on the static loading experiment of four reinforced concrete floor slabs, the paper studied their loading mechanism and bending performance, such as deformation, bearing capacity and fail modes,there is much significance to provide a scientific basis for application in the field of practical engineering of the reinforced concrete floor slabs and to popular this new type of reinforced concrete floor slab.

Abstract: The thermal performance of a new rock wool color steel sandwich board is calculated and the results are analyzed comparatively with those of other thermal insulation materials in this paper. The result proves this type of rock wool color steel sandwich board to be worth promoting because of its well thermal performance, and of its satisfaction with requirements of relevant thermal specifications.

Abstract: In this paper, the contamination of heavy metals in atmospheric particles of PM_2.5 and PM₁₀ in a city in China was analyzed, meanwhile the sources of different heavy metals (Cd, Hg, As and Pb) in atmospheric particles (PM_2.5 and PM₁₀) were confirmed by source apportionment in a city in China area through principal component analytical method. The research results showed that the heavy metals in PM_2.5 and PM₁₀ contaminated the atmosphere environment dramatically. The heavy metal Cd, Hg and Pb came mainly from incomplete combustion of petrol, while the heavy metal of As was the product of electronic metallurgy, which provides the theoretical basis for controlling of atmospheric heavy metal contamination. This method can be also applied to source apportionment of other heavy metals in atmosphere environment.

Abstract: Effects of extraction-stripping loops of organic phase on organic chemical entrainment in the aqueous raffinate in copper solvent extraction were studied in this paper. Results demonstrated that the total amount of organic chemicals lost in the aqueous raffinate decreased with the increase of times of extraction-stripping loops but reached largest at third loop. Entrainment was the dominate way of organic chemicals losing in the aqueous raffinate at early stage of the loops. The formation of entrainment and its stabilization mechanism was also studied. The average size of entrained droplet trended to increase with extraction-stripping loops increasing. Meanwhile, the absolute value of zeta potential trended to decrease. The surface tension of the aqueous raffinate increased after reaching the minimum value 41.3 mN/m at the 3rd loop. It showed that the formation of entrained droplets and its stability were mainly affected by the surface tension of aqueous raffinate.

Abstract: It is clear that operational reliability of aircraft equipment is very important to aircraft. Because the equipment consists of a variety of components, their material properties can have a great influence upon improvement of operational reliability. In order to obtain better reliability of the equipment, selecting components of the equipment carefully must be done in material properties. Reliability theory FMECA is applied to improve operational reliability of the product. Based on the process of FMECA, all kinds of the failure mode, reasons, effects and criticality of the products can be determined completely. All selected components of the equipment may be confirmed in improving material properties finally. The results indicate that selecting component properly in material properties can be useful and effective for improving operational reliability of all equipments.

Abstract: This paper analyzes the causes of the traditional building materials to produce pollution. The application of environmental friendly materials in buildings is proposed. The characteristics, classification of environmentally friendly materials and the specific application cases are also described. The enhancement of environmental awareness improves the application of environmental friendly materials, which determines the environmental friendly material becomes the trend of development of the construction industry in the world.

Abstract: The durability of high performance concrete is the main index of design. design.With the high durability, the high volume stability,the high compressive strength and the good workability, high performance concrete widely used in high-rise buildings, large-span Bridges, offshore in the construction of buildings, roads, etc.This paper prepared with different water/cement ratio of high performance concrete and tested the concrete workability, mechanical properties, durability.High performance concrete need preparate with low water/cement ratio, choose high quality raw materials,adding a sufficient number of mineral admixtures and high-performance admixture. Useing the high strength and high performance concrete can decrease the size of cross section, lose weight, gain greater economic benefits.

Abstract: Brush plating has been an important technology for the mending of the scratched surface of the engineering parts. The high-temperature alloys are common used heat-resisting material .The process for brush plating mending of deeply scratched surface of the parts made by high-temperature alloys is introduced, the technologic methods of high-temperature alloys are studied and analyzed, the merits of the brush plating mending technology of high-temperature alloys are discussed in this article.

Abstract: CrN_x coatings were prepared by closed filed unbalanced magnetron sputtering (CFUMS), and the effects of N₂ flux ratio and bias voltage on CrN coatings were investigated. Results showed that the phase in coatings was the coexistence of CrN, Cr₂N and Cr, and CrN(111) always showed an intensive preferred orientation in both cases, but CrN(200) enhanced with the rise of bias voltage. The hardness of coatings decreased with an increasing N₂ flux ratio, while improved with an increasing bias voltage. The grain edges were polished off and the boundaries became blurred when higher bias voltage was applied. All in all, the surface morphologies of CrN coatings became flatter and denser with both increasing N₂ content and bias voltage, respectively.