Advanced Materials Research Vol. 772

Abstract: This work is aimed at resistance to durability of steel slag concrete containing different kinds of steel slag based on maximum utilization of industrial waste residue. The experimental investigation is conducted to study the resistance property to freezing-thawing of concrete which containing steel slag aggregate (SSA), steel slag powder (SSP) and ground granulated blast furnace slag powder (GSP) respectively. One of the specimens is made of ordinary concrete without steel slag as baseline group, the other three concrete specimens are fabricated with the utilization of SSA, and the replacement level is 25%, in combination with 30% SSP or 30% SSP/20% GSP by total binder content. The durable property of steel slag concrete in this study is freezing-thawing resistance, microscopic properties are analyzed by SEM and XRD tests. Experimental results indicate that the concrete which SSA replacement level is 25%, and in combination with 30% SSP and 20% GSP, resistance property of freezing-thawing is superior to baseline group, total dosage of steel slag achieved to 55%. And the mechanism of combined action by adding steel slag is discussed in this paper.

Abstract: Textile reinforced concrete (TRC) is a new composite material in structural engineering, in which textile fabrics are used as reinforcement. In recent years, much research has been done to investigate the bending behavior of TRC samples. The focus of this research is on the use of low performance yarns as reinforcement and investigating the effect of finesse of yarns and reinforcement ratio on the bending behavior of TRC samples. The comparison of samples strengthened with same number of fabric layers but made up different finesses show that ultimate strength of samples increases in the yarns with lower finesse. Meanwhile the results show that reinforcement ratio is an important factor on bending behavior of TRC samples and strain hardening behavior can be obtained in 1/15% of reinforcement ratio in coarser yarns.

Abstract: Most widely used material in ship hull construction is undoubtedly the steel. Composite materials have become suitable choice for marine construction in 1960s. The usage of the fiber reinforced plastic (FRP) in marine applications offers ability to orient fiber strength, ability to mold complex shapes, low maintenance and flexibility. The most common reinforcement material in marine applications is E-glass fiber. Composite sandwich panels with FRP faces and low density foam cores have become the best choice for small craft applications. The U.S Navy is using honeycomb sandwich bulkheads to reduce the ship weight above the waterline. Composites will play their role in marine applications due to their lightness, strength, durability and ease of production. It is expected that especially FRP composites will endure their life for many years from now on in the construction of boat building.

Abstract: Non-shrinking composite silicate insulation material has advantages of low drying shrinkage, density, thermal conductivity and good thermal insulation which withstands high temperature and militates in favor of specially shaped structural member construction, etc. This article describes raw materials and the production process of the above material, discusses thermal insulation characteristics, technical performance and the features of use and particularizes the application effect in the project.

Abstract: This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber reinforced concrete is the best.

Abstract: Analyze the safety of the wire rope fixtures through experiment while constructing the COMAC ministry of installed plant. Pointed out the proper use of the provisions of the steel erection specification, and the number of provisions chuck is unsafe. The timely replacement of the shackle wire rope connection ensured the security of the lift process through experiments. This method can provide some experiences to the construction and fabrication of the steel member of the project.

Abstract: Because of the smaller cross-sectional area, the flexural properties often become the controlling factor in PHC pile. Φ500 PHC is widely used as an engineering design pile in the Yangtze River Delta region. On the basis of the analysis of pile soil interaction mechanism, the single Pile under different conditions is discussed. The parameters are discussed in this article are PHC piles wall thickness, horizontal loads, bending moments, pile elastic modulus and other engineering parameters.The studies show that, the distribution of bending moment and shear is significant in 2 ~ 4m below the top surface of the pile, and after 6m, the value of them closes to 0. The main sphere of influence of the single pile bending moment and shear is concentrated at 3 ~ 4m below the top surface of the pile. Along with horizontal load enlargement, the maximum bending moment is mainly concentrated at 1.5 m below the top surface of the pile, and the maximum pile shear is mainly concentrated at 1.9 m below the top surface of the pile. Along with bending moment on the top of the pile enlarge, the maximum bending moment is mainly concentrated at 2.5 m below the top surface of the pile, and the maximum pile shear is mainly concentrated at 3.0m below the top surface of the pile. Optimize sectional area of Φ500 PHC should be selected as 0.17, and the wall thickness should be selected as 170mm.

Abstract: A new kind of anchoring option is researched. The results show that the optimal scheme is feasible and effective. The main steps and programs of the static tension test are introduced. The testing and calculation methods of bond stress are introduced. Based on the actual engineering data, the research of bond stress under design tensile is proposed. A simplified model of the bond stress is established according to the experimental data. The results of checking show that bond stress distribution curve and the simplified model agree with the experiment. Maximum error is less than 7.2% and 7.0% respectively.

Abstract: Two sweet sorghum varieties (salt tolerant Jitianza 2 and salt sensitive Lvneng 1) were used to investigate their adaptation to NaCl stress under different cultivation conditions of potted cultivation and field cultivation, and selective transport capacity for K⁺ over Na⁺, and Ca²⁺ over Na⁺ of leaf sheath. NaCl stress decreased Pn, Fv/Fm, fresh weight of leaf sheath and leaf blade, field yield in both varieties. NaCl stress induced Na⁺ accumulation while it decreased K⁺ and Ca²⁺ levels in leaf sheath and leaf blade of both varieties. The increase in Na⁺ of leaf blade and the decrease in K⁺ and Ca²⁺ of leaf blade were greater in Lvneng 1 than those in Jitianza 2. Furthermore, the Na⁺, K⁺ contents in leaf sheath of Jitianza 2 were significantly higher than those of Lvneng 1 under NaCl stress. The selective transport capacity for K⁺ over Na⁺, and Ca²⁺ over Na⁺ of leaf sheath in Jitianza 2 was significantly greater than that in Lvneng 1. Pn, Fv/Fm, stem stalk field, ear field, juice yield, stalk Brix, sugar content of Jitianza 2 were significantly higher than those of Lvneng 1, which was correlated with stronger selective transport capacity for K⁺ over Na⁺, Ca²⁺ over Na⁺ of Leaf Sheath of Jitianza 2.

Abstract: This paper compared two kinds of catalysts, Co₃O₄/GO and Mn₃O₄/GO, which were applied to catalyze PMS for NOx oxidation. The parameters of the pH, PMS concentration, catalyst concentration, reaction time and the temperature were investigated. Under the same parameters, the results showed that the oxidation efficiency were 70% and 50%, respectively.