Advanced Materials Research Vol. 511

Abstract: with the continuous development of bridge engineering，the massive concrete has been widely used in large-scale bridge foundation engineering. But it often has the problems of crack and deformation, which infuenced the entirety and durability of the whole structure seriously. In this paper, a hydration heat analysis of the platform of a corrugated steel webs bridge is carried out by using MIDAS/Civil structure finite element method analysis program, the analysis summarizes the temperature distribution regulation of platform concrete influenced by hydration heat and the temperature changing regulation affected by time. Meanwhile, some countermeasures of preventing the crack of concrete are put forward.

Abstract: High-rise building is one type of architecture which is strongly dependent on structural technology, materials technology and equipment technology. Its emergence promoted technical innovation with ceaseless breakthrough. Contemporary high-rise buildings pursue ecological design through the use of new technologies, new materials and advanced scientific means such as structure, equipment, materials and construction methods.

Abstract: In order to choose asphalt reasonably, the asphalt pavement performance zone at Liupanshan area of Ningxia was studied according to 30 years’ climate datum. According to the statistics analysis of 30 years’ air temperature and field temperature in the hottest and coldest month, it was suggested that: the high design pavement temperature should be determined according to the average high field temperature in seven consecutive days with 98% reliability, the low design pavement temperature should be determined according to the lowest field temperature of a year with 98% reliability. This method was applied at Liupanshan area to decide the asphalt pavement’s temperature field, which was in accordance with Liupanshan area’s conditions

Abstract: Abstract: Alloy 600 was studied in different acidic environments with three approaches including Tafel curve method, linear polarization method and AC impedance curve. Experimental results showed that there was greatest corrosion velocity when pH was 4 for preventing film factor; and it was possibly caused by elements corrosion dissolving with different proportional compared with Alloy 600 metallurgical contents.

Abstract: Alloy 600 was studied in different Na2SO4 solutions with three approaches including Tafel curve method, AC impedance curve and high temperature experiment. Experimental results showed that interface electric transfer process was the control step of whole electrochemistry process; and selective corrosion of Alloy 600 would not happen in high temperature process

Abstract: Through orthogonal analysis test analyzed three main process parameters(Acupuncture frequency, acupuncture number and acupuncture depth) on the influence of the preparation of Natural Bamboo Fiber/ Polypropylene fiber non-woven materials. The results show that when Acupuncture frequency, acupuncture number and acupuncture depth are 7.8mm\550/min\6 Composite material performance is the best; Acupuncture depth for material mechanics performance influence is the largest

Abstract: Cassiterite-polymetallic sulphide ore contains multi-elements that can be recovered in beneficiation. Case studies on processing two major tin deposits in Gejiu and Dachang regions are reviewed. Results show that the joint process of flotation and gravity separation has proven to be effective in treating the ores for its high efficiency and relatively small environmental impact. Flotation of tin minerals is considered as a supplementary technique for concentrating cassiterite from the slime produced in the joint process. The joint process is still a promising process in treating the cassiterite-polymetallic sulphide ore.

Abstract: Tailings from Aba zinc-lead concentrator cannot be discharged in tailings dam by traditional wet disposal method due to the location restriction and environmental consideration. Treatment and disposal of the tailings become a serious problem that should be solved. Through investigation of tailings disposal in similar concentrators of China, a joint process of dewatering by hydrocyclones and pressure filters has put forward, in which a dry material can be obtained and disposed in dry manner, and the water produced in the process can be reused. This process is expected to set a good example for concentrators where construction of tailings dam is impossible

Abstract: In allusion to the problems such as the poor flatness of the parts , not-easy-guaranteed aperture precision, low strength and short service life of mould that occur in stamping production of the screen hole parts, this article detailed introduced the diamond punching method and at the same time it summarized the maintenance of the mould that this method uses