Advanced Materials Research Vols. 779-780

Abstract: Enzymatic refining of eucalypt bleached kraft pulp with the cellulase NOV476 was studied. The effects of this cellulase on the physical properties of pulp, fiber morphology and fiber appearance of the eucalypt bleached kraft pulp in different application conditions were discussed. The results show that, with the increase in the amount of enzyme, tensile strength index, burst index and TEA index of paper are increased and then decreased; elongation and tear index of paper have been declining, Zeeil tensile strength index has been an upward trend. Without beating the pulp sample, gradually increases as the amount of enzyme, the average fiber length and the average fiber width are gradually reduced, while mean kink index substantially constant. Number of vessels in fiber overall reduced tendency reaches a minimum in the amount of enzyme 0.5μ/g, the phenomenon is most obvious. In the same conditions of beating time, gradually increases as the amount of enzyme, the average fiber length is gradually reduced, an average fiber width is gradually increased, the mean kink index reaches a maximum in the amount of enzyme is 0.5μ/g. Number of vessels in fiber overall reduced trend.

Abstract: Fuzzy mathematics were used to evaluate the comprehensive property of fabrics in this paper. This is because fabrics are good or bad is a feeling of Physiology and psychology, used fuzzy mathematics to evaluate its comprehensive properties is objective and accurate. First, the evaluation indexes are selected according to the required performance of sporswear fabrics, and the Fuzzy mathematics was used to establish comprehensive evaluation model, then the comprehensive property of four sportswear fabrics were evaluated based on this comprehensive evaluation model. The evaluation result indicated that polyester cover cleancool fiber structure fabric has the best comprehensive property, this comprehensive evaluation results pruved that this developed sportswear fabric has excelltent comprehensive properties,and it is suitable for making high quality sportswear.

Abstract: Anode material Li₄Ti₅O₁₂ was prepared by the method of solid-state reaction at high temperature. In the experiment, it was utilized by undoping and a small amount of Mg²⁺ doping with raw material respectively. The morphology of powder was observed by scanning electron microscopy (SEM), the phase analysis was done by X-ray diffraction analysis (XRD), and the charging and discharging tests with constant current were also carried out at room temperature. The results showed that little effect was on the particle size by a small amount of Mg²⁺ doping, the change of the structure of the powder material was not caused, but the conductivity of Li₄Ti₅O₁₂ anode material was increased, the capacity and stability of the charging and discharging cycles were raised. It fully proved that Mg²⁺ doping was relatively effective. Keywords: Li-ion battery;lithium titanate (Li₄Ti₅O₁₂); doping;charging and discharging.

Abstract: This paper is to evaluate the feasibility of using warm mix asphalt (WMA) technology to produce quality open graded friction course (OGFC) mixtures. In the summer of 2012, a field trial project using Sasobit-OGFC was established in the Huanhu East Road project, Changzhou city. In line with the trail field project, the performances of raveling, draindown, rutting resistance and moisture susceptibility are conducted between Sasobit-OGFC mixtures and traditional HMA-OGFC mixtures. The results indicate that the mixing temperature of Sasobit-OGFC mixtures can be reduced by 20°Cwhen compared with that of HMA-OGFC mixtures. The performances of Sasobit-WMA mixtures are no worse than these of HMA-OGFC mixtures. A wider range of paving temperature is found when adding Sasobit into OGFC mixtures, which effectively enhances the quality of pavement construction.

Abstract: In order to study the frost-resistant durability of recycled concrete, This test of freezing and thawing cycle were conducted to normal concrete specimens, recycled concrete specimens and include 2% LJ115 liquid anti-freezing mixture recycled concrete specimens respectively by quickly freezing method at±20±2°C. On the basis of this ,to the four kinds of specimens, analyse the mass loss rate and the dynamic modulus of elasticity.The result indicates that the frost-resistant durability of include antifreeze recycled concrete had improved greatly, even more than the normal concrete.

Abstract: Water-vapour permeability is a critical factor of writing/ printing papers in most of practical applications; but how to monitor the manufacturing process to keep the key characteristic of the paper in control is still understudied. Therefore, in this paper, in order to monitor the water-vapour permeability of writing/ printing papers, MaxGWMA chart is first suggested due to its best effectiveness in terms of average run length performance and its high capability of detecting small shifts in the process mean and variability as well as identifying the source and the direction of an out-of-control signal. By using MaxGWMA chart, assignable causes of any out-of-control signal should be deeply examined so as to have proper corrective actions undertaken to either eliminate them from the process or reduce the variability induced by them to make the papers consistently manufactured under a stable process.

Abstract: This paper deals with the feasibility of beach protection project alternative materials - the Yangtze River soil and sand, applies PCSB curing agent to solidify it and to produce beach protection blocks. Experimental studies on the performance of strength, setting time, stability and anti-erosion have been carried out to inquire into the regularity of solidification. Using soil and sand curing blocks instead of concrete blocks in the application of Yangtze River beach protection engineering has advantages of technology, economy and environment protection etc.

Abstract: This paper presents the foaming behavior of PLA-CO₂ and PLA/beeswax-CO₂ systems for solid state foaming process with particular goal of producing low density foams. The low density PLA foams can be achieved under 2 MPa sub-critical CO₂ condition due to CO₂-induced crystalline. When 10wt% beeswax was added to PLA matrix, the tensile strain at break increases from 7.9% to 22.2% and crystallinity remain unchanged. The inherent brittle deformation behavior of the PLA was transformed into relatively ductile behavior after blending 10wt% beeswax. The expansion ratio of neat PLA and its blends with 10wt% beeswax increase from 1.08 to 19.4. The ductile deformation behavior of PLA is an important factor for solid-state PLA foam.

Abstract: To study the failure mechanism and failure mode of jointed rock under compressive-shear, many rock-like material specimens containing non-coplanar joints were made and a series of experiments were carried out. In the experiments, mica sheets were used as joint fillings, cement mortar was selected as rock-like material. Joints were made by inserting the mica sheet in cement mortar before initial setting. Mica sheets were left down as joint fillings. The results of experiments show that the dip angles of major joint have important influence on the failure mode of specimens. And the emerging position of wing cracks which exist in the prophase of specimens failure process changes with the dip angle. The shear strength of specimens has an important relationship with the dip angle of major joints. The smallest shear strength happens in the specimen with a joint angle of 15°, while the biggest value happens in 60°.

Abstract: Grape-like structure La³⁺-doped ZnO nanofibers with different doping concentrations were prepared by electrospinning-calcination technology. The resultant nanofibers were characterized by field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), photoluminescence spectrum (PL) and X-ray photoelectron spectrum (XPS) respectively. The photocatalytic activities of the nanofibers for the degradation of Rhodamine B (RhB) in aqueous solution were studied. Results show that the doping concentration of La³⁺ has an significant influence on the photocatalytic performance of the nanofibers, and 2 mol.% La³⁺ is the optimal doping concentration.