Advanced Materials Research Vols. 602-604

Abstract: The purpose of this study is to investigate the bond characteristics between ECC(Engineered Cementitious Composites) and GFRP(Glass Fiber Reinforced Polymers) rebars. An experimental study was carried out to investigate the bond-slip properties of the steel and GFRP rebars in ECC which was reinforced with Polyvinyl Alcohol(PVA) fibers. A total of 8 beam specimens, which was designed according to the RILEM guidelines, was tested according to the RILEM guideline. The main objective was evaluating the load versus displacement and load versus slip behavior and the bond strength regarding the influence of the following parameters : concrete type(Normal concrete and fiber reinforced concrete) and bar diameter and type. From the test results, concrete and ECC specimen presented similar behavior for steel reinforced specimen. However, GFRPO reinforced specimen show different behavior with that. Comparative study for test and equations of MC90 was carried out and code provision predicted the bond characteristics conservatively.

Abstract: There are a number of factors affecting on the high temperature and water stability of Stone Matrix Asphalt (SMA). However, under a concrete condition of traffic, climate and construction, together with reliable raw materials, the proportion of various raw materials are the main factors. SMA-16 is taken as an example, by using the Rutting test, Residential stability test and Freezing–thaw cycling test for analysing the impact of the modified asphalt, fiber and mineral filler proportion on SMA. The result shows that these three factors significantly impacted on the high temperature and water stability of SMA with the optimal values of 6.0-6.2%, 0.31% and 10-11%, respectively.

Abstract: In this paper, the releasing behavior for chloride ions in concrete with marine sands is studied. The experimental results show that chloride ion is released completely as soon as marinating in water. And the total releasing of chloride ion has little grown over time. The releasing of chloride ion would not be changed with the increasing quality of marine sand. Whereas, the releasing behavior is different for the different quantity of marine sand in saturated Ca(OH)2 solution which the content of chloride ion decrease with the increasing of marine sand. SEM/EDS observations show that distribution of chloride concentration in the mortar with marine sand is inhomogeneous and the chloride ions reveal a permeable process from surface of marine sand to the internal of cement gel. But for the experimental results of the mortar with internal doped chloride ions from NaCl solution, there is no permeable process in chloride ion of mortar and its distribution is irregular in the products of cement hydration.

Abstract: Hydrogen consumption test platform include hydrogen storage part, pressure reduced part, gas filled part and test part is designed with calculating real hydrogen providing ability of fuel cell vehicles, being reference to actual structure of hydrogen providing system, and considering requirements of test platform based on weight method, temperature pressure method and flow method. In addition, a series of experiments proved that the test platform not only meets the test requirements of hydrogen consumption but also has advantages such as work stable, safe and reliable, high accuracy, convenient maintenance and strong expansibility.

Abstract: This paper presents an improved and easy-to-use battery dynamic Hybrid-Electric Vehicle model. The fuel cell electrical subsystem and the energy management subsystem of the HEV are validated experimentally. An interesting feature of this model is the simplicity to extract the dynamic model parameters from FCV (fuel cell vehicle). Finally, the HEV model is simulated in the matlab simulation software .The results show that the model can accurately re-present the dynamic behavior of the HEV.

Abstract: This paper presents an improved and easy-to-use battery dynamic model. The charge and the discharge dynamics of the battery model are validated experimentally with Ni-Mh batteries types. An interesting feature of this model is the simplicity to extract the dynamic model parameters from batteries datasheets. Finally, the battery model is simulated in the matlab simulation software .The results show that the model can accurately re-present the dynamic behavior of the battery.

Abstract: In order to enhance the electrochemical performance of LiMnPO4 cathode material, we optimized the synthesis conditions of LiMnPO4 using a simple solid state reaction. The influence of factors of the pre-sintering temperature, carbon source and molar ratio of Zn to Mn, as well as the electrochemical properties of obtained LiMnPO4 powder were studied. The precursor of Zn-doping LiMnPO4/C was characterized by Differential Scanning Calorimetry and thermogravimetry. The microstructure of the samples was characterized by X-ray diffraction (XRD). The optimized LiMnPO4 cathode has good electrochemical properties and its discharge capacity could reach 140.2 mAh g−1 at 0.02 C rate and 111.3 mAh g−1 at 0.1 C rate with satisfactory cycling performance. It implies that the synthesis of LiMnPO4/C composite with excellent electrochemical performances can be achieved by a simple solid state method, which will boost the practical application of LiMnPO4 cathode materials.

Abstract: Silicon/carbon anode materials of different proportions for lithium ion battery were prepared by high energy ball milling. The composites were characterized using X-ray diffraction (XRD), and scanning electron microscope (SEM). The electrochemical performance of the composites was tested by means of galvanostatic testing system. The results indicated that the initial reversible capacity reached to 2162 mAh•g^-1, which was much larger than the theoretical capacity of carbon negative materials at the ratio of 6:4 (Si: C). The capacity maintained to 1042 mAh•g^-1 after 50 cycles. High capacity and good cycle property of the Si/C composites revealed that they were potential to take the place of the traditional carbon anode materials.

Abstract: This study presents the use of bio-solution and nano-Titanium dioxide (TiO2) based additives for dosing in diesel and palm biodiesel (B5). The aim of this work is to enhance the performance of a direct injection (DI) engine and to simultaneously reduce the exhaust gas emissions. The basic properties such as kinematic viscosity, specific gravity, flash point, fire point, and carbon residue of the test fuels were measured and accepted in ASTM standards. Overall, diesel-bio-solution and diesel-TiO2 blends show the lower break specific fuel consumption by 13% and 10%, respectively and the lower exhaust gas emissions, as compared with diesel. B5-bio-solution blend provides the break specific fuel consumption decreased by 1.68%, while exhaust emissions were effectively increased in comparison with B5 fuel.

Abstract: The experiments of corn stalk combustion in 21%O2/79%CO2 and 21%O2/79%N2 atmosphere at different temperatures (800°C-1200°C) were performed in a fixed-bed reactor experiment system. NO concentration as a function of time and NO yield were obtained. The results show that NO emission is lower in 21%O2/79%CO2 atmosphere than that in 21%O2/79%N2 atmosphere at the same temperature. With the elevation of temperature, NO yield increases first and then decreases in the same atmosphere.