Advanced Materials Research Vol. 1081

Abstract: PET material has excellent performance and its modification of biocompatibility had been concerned for researchers. In this paper, graft polymerization of acrylamide on PET fiber by co-irradiation was investigated, and then treated in 5% available chlorine content of NaClO solution, which make the amide groups on the PET fiber surface into amine groups, and provide the reactive groups for further functional modification. The results showed that the moisture absorption of PET fiber increases after the grafting of acrylamide, and its hygroscopicity increases with the increase of grafting yields; after the amide groups converted into the amine groups, the hygroscopicity of PET fibers decreases. The chemical structure and surface morphology of PET fiber and modified products were characterized by ATR-FTIR and SEM, which certified that acrylamide had been successfully grafted on PET fibers and the amide groups on its surface had been converted into the amine groups.

Abstract: Karagozian & Case Concrete (KCC) model in LS-DYNA is a parameter automatically generated material model for simulation of concrete. By giving the unconfined compressive strength of the concrete material, all other constitutive material parameters will be generated by the model. It is a valuable concrete model for users who have no laboratory data or conduct tentative simulations. However, the automatically generated parameters will induce error when the concrete material behavior deviates from the regular behavior. In this research, a calibration method is introduced to show a simple way for generating input material parameters of ultra-high performance concrete (UHPC). Empirical equations for triaxial compressive tests are used here for the calibration. The calibrated model is firstly checked by the simulation of uniaxial compression test with one element and the results reveal that the calibrated model shows a better agreement with the test data than the parameter automatically generated KCC model.

Abstract: It was based on laboratory test, in order to study on the high temperature stability, water stability and low-temperature crack resistance of AC-16 reclaiming asphalt mixture with different proportion of old material, this test takes into account 9 kinds of these asphalt mixture. The results show, with the old material blending ratio increased, the high temperature stability of asphalt mixture changed for the better, water stability and low-temperature crack resistance deteriorated. The pavement performance meet the requirements of secondary road or less, when old material content is within 70%. The research results provide reference for the application of reclaiming asphalt mixture.

Abstract: Ceramisite cellular concrete is a kind of energy-saving materials, which has many advantages, such as low self-weight, better insulation and so on. This paper describes an experimental study of hydration heat process .It proved that the ambient temperature, the amount of fly ash and silica fume influence hydration speed apparently and compressive strength of the concrete.

Abstract: A new preparation technique of carbon steel/stainless steel clad tube was introduced, and the contact surface was well combined. Meanwhile, with the using of tube heat exchanger, the experiment on the heat transfer performance of the clad tube was done. Comparing the 10/316 clad tube and the 316 stainless steel tube, the effects on the heat transfer performance of 316 stainless steel tube attached to carbon steel was evaluated. It is showed that overall heat transfer coefficient of 10/316 clad tubes is higher than that of stainless steel tube. The average heat transfer coefficient of 10/316 clad tubes is about 18.7%~34.4% higher than that of stainless steel tube. Experimental investigation indicates that, by brazing and cold drawing, the 10/316 clad tube was well combined and the thermal conductivity was better than that of stainless steel tube.

Abstract: The carbon fiber reinforced geopolymer composites were synthesized with metakaolin, water glass and short carbon fibers. The surface treatment short carbon fibers are homogeneously distributed in the geopolymer matrix. The composites exhibit excellent mechanical properties and electrical conductivity. The flexural strength of the Cf /geopolymer composites reached 27 MPa with carbon fiber content of 2.78 %, and its electrical conductivity are increased from 10^-5 to 10^-1 S.m^-1. However, when the carbon fiber content exceeded 4.15 %, the conductivity of the composites kept a constant.

Abstract: Thermal deformation of concrete at low temperature expands from-20°C to-50°C and contracts from-30°C to-10°C. Based on previous studies, the paper tries to explain the deformaion trend by analyzing freezing point of bulk solution and pore solution in saturated hardened cement paste. The result shows that it is critical to thermal deformation of cement-based materials at low temperature that pore solution in the pores smaller than 8 nm freezes.

Abstract: We propose a new method to make OGFC-13. By this method we select steel slag as coarse aggregate (whose diameter is bigger than 4.75mm) and limestone as fine aggregate, using the SBS modified asphalt to make OGFC-16. The Mix Proportion is 1^#(19-13.2mm,steel slag):2^#(13.2-9.5mm, steel slag):3^#(9.5-4.75mm, steel slag):4^#(4.75-0mm, limestone):mineral powder=13%:28%:45%:13%:1%. The optimal asphalt content (OAC) is 4.5%, the polyester fiber content is 0.3%, and the steel slag content reaches 86%. The increase of the amount of asphalt and polyester fiber doesn’t help to save costs. When the asphalt content is optimum, the run-off loss and Cantabro scattering loss satisfy the Chinese regulatory requirements. By Marshall Stability test, we find that the Marshall stability of OGFC-13 reaches 9.8kN, superior to China's traffic regulations. The water permeability coefficient of OGFC-13 is 37.0, which means that OGFC-13 has a strong water seepage performance. In a word, OGFC-13 made by our method can guarantee the driving security of the long-term use of the road and save a lot of road maintenance costs.

Abstract: In this paper, chemical etched Si microchannel plates (Si-MCPs) is fabricated to use as lithium-ion battery anode. Copper formed by chemical deposition was served as current collector. The chemical etched Si-MCP with copper current collector exhibited a better cycle performance in the galvanostatic charge-discharge measurements. The reaction mechanism was also investigated based on cyclic voltammetry test.

Abstract: In this research, the laccase mediator system (LMS) was used to modify the unbleached triploid populus tomentosa alkaline hydrogen peroxide pulp (APMP). The changes of pulp brightness were measured and the effects of LMS on the subsequent hydrogen peroxide bleaching were also determined. Besides, the fiber morphology was analyzed by ESEM, and then the obvious changes of pulp have been recovered. In a word, the LMS has obvious effect on cellulose.