Papers by Keyword: Physical Performance

Abstract: The process of synthesizing polyurethane (PU) membranes typically involves linking together networks of polymers using organic materials like polyols and isocyanates. Subsequent investigations used additional inorganic substances within PU polymers to enhance the mechanical and thermal characteristics of membranes. In order to be used as a sensor matrix, the PU membrane needs to have certain good qualities and be able to firmly attach to ions. Hence, further refinement of the membrane is necessary in order to enhance these attributes. The PU membrane made from castor oil (Ricinus communis L.) was changed in this study by adding ĸ-carrageenan and D2EHPA. The composition of the membrane plays a crucial role in governing the creation of hard and soft segments within the membrane structure. The right membrane composition can be found by using Expert Version 13 software for process design. This software is based on the Response Surface Methodology and uses Box-Behnken Design. The primary aim of this study was to fabricate PU membranes utilizing natural resources while ensuring the attainment of desirable qualities. The R² and PRESS values, which are very important for figuring out how important the physical performance response is, led to the choice of the quadratic model design as the best one. One of the experimental conditions was the use of 0.231 mg of D2EHPA, 1.241 mg of κ-carrageenan, and 3.840 g of acetone. The final mixture was predicted to have a visual scale value of 6.5 so that a membrane with the best physical properties in terms of strength and flexibility could be made. The composite-derived PU membrane has favorable physical performance. The findings of this study can serve as a foundational element for the advancement of PU membranes in a wide range of prospective applications.

Abstract: By using Mn slag, Mg slag and Fly ash which comes from industrial process in Ningxia province as raw materials, the sulpoaluminate cement was prepared via sintering raw materials in a furnace. The physical and chemical characteristic of sulpoaluminate cement clinker was tested. The optimal proportion of clinkers is also determined by the results of phase composition, microstructure and hydration mechanism. The results shows that when the mixed ratio of Mn slag, Mg slag and Fly ash is 21%, 21% and 0% respectively in the raw materials and the calcination temperature is 1300 °C for 30 min, sulphoaluminate cement clinker with maximum amount of C₄A₃S, C₂S and C₄AF was prepared. Then, natural gypsum was added into the clinker powder with a ratio of 15% to make cement materials. When water to cement ratio is 0.5 and cement to sand ratio is 1:3, the cement mortar obtain a compressive strength of 22.22 MPa at 3d, 31.2 MPa at 7 d, and the flexural strength of 3.86MPa at 3d, and 4.83 MPa at 7d respectively.

Abstract: In this study, composite lumber from a combination of bamboo strips and oil palm trunk veneers was produced and physically tested. The bamboo strips and oil palm trunk veneers were laid-up together alternately with two different types of layer orientation, such as parallel and cross orientations to each other. The composite lumber was pressed using hydraulic hot pressing machine at two different pressing times, such as 12 and 15 minutes. Phenol formaldehyde (PF) adhesive was used in the lamination process. Physical performance tests such as cold water delamination (CWD), hot water delamination (HWD), flexural and compression were conducted based on Japanese Agricultural Standard for LVL JAS: SE-10 [1]. Results showed that longer pressing time has increased the physical performance, except for flexural and compression performance of parallel orientation composite lumber. Cross orientation has increased the bonding strength behaviour between bamboo strips and oil palm trunk veneers, thus influenced the low delamination percentage and good modulus of elasticity value of composite lumber. Generally, this study has increased the understanding on physical performance of bamboo strips-oil palm trunk veneers composite lumber at different layer orientations and hot pressing times.

Abstract: Through using acetic acid resin, asphalt and urea resin organic pretreatment methods to pretreat the surface of rural construction waste, and testing of crush index and water absorption rate of recycled coarse aggregate after pretreatment, the research for the influence of organic pretreatment technology on physical and mechanical performance of recycled coarse aggregate. The results prove that organic infiltrating pretreatment technology can effectively enhance the density of the coarse aggregate and decrease the crush of recycled coarse aggregate index, in a certain extent. The crush index of recycled coarse aggregates after organic pretreatment decreases at almost 17.63%, what’s more, organic pretreatment technology can decrease the water absorption rate of coarse aggregate by a large margin. The water absorption rate of coarse aggregate can be reduced to a minimum of 2.03% which closes to the level of natural aggregates. Because of urea resin solidified into film at fast speed, high integrity and high wear resistance, and relatively cheap, urea resin’s pretreatment effects on recycled coarse aggregates is better than acetic acid resin and asphalt.

Abstract: Two kinds of polymer latex and fiber are used to improve the physical performance of cement mortar. The influences of the fiber and latex added alone and together on the compressive and flexural strength, toughness, bondability, and compactedness of the hardened mortar were studied, and the modified mechanism was also discussed by SEM and XRD. The results showed that both of the latex and fiber can improve the compressive and flexural strength of mortar in low content, decrease the porosity, improve the toughness and bond flexural strength significantly, and delay hydration process of cement mortar. The effect of fiber-latex added together was better than that of two matters added separately. The optimized components for fiber-latex hybrid were: ACE12% + PVA1.6 kg/m3.

Abstract: In this paper, two kinds of hydroentangled nonwovens made from the same raw materials and process but different high pressure manifolds is tested to investigate the effect of manifold geometry on the physical performance of products. The results show that the sample treated by slot type manifold has better properties, which has higher hydroentanglement intensity and better abrasion resistance, but no big difference with the pore size distribution. The results are in good agreement with our previous simulation data.

Abstract: In this research, the wood residues of mixed birch and larix gmelini rupr are used as the bulk material, and phenolic resin glue and moso bamboo slice as reinforcing material to make flakeboard through three-phase pressure process. Data Processing System (DPS) is used to analyze glue volume, density and other technical parameters’ impact on the performance of wood composite product, establish multiple linear regressive mathematic models, compare and optimize experiment plan, find out and verify the best technical conditions. The result shows that the overall objective function will reach 6.908 when glue volume is 8.107%, density 0.870 g/cm3, thickness 2.015cm and moisture content of 9.799%.

Abstract: With science and living standards progress, functional textile products become more and more popular. The natural and no added finishing method is especially pursuited by people. In this paper, we report on the use of extract from cactus to synthesize the silver nanoparticles. The particle sizes about 30nm were prepared under the unpolluted environment. The basic raw material is natural selection, preparation method is simple, non-polluting, eco-friendly and to address the reliability of a better way. Natural fabrics treated with natural plant , not only improve the added value of the product ,but also achieve natural of the fabric, meet the requirements of the modern people. This research product the cactus silver nanoparticles silk fabric, demonstrated that the cactus solution can fix the nano-silver uniform on the surface of the silk fabric. Compare with the result of the physical performance and wearability of this fabric, the mechanical properties of the fabric is decline, but the degree of the decline is not high, the moisturizing properties of the finished silk fabric are increased. The result revealed the tensile properties remained basically unchanged, the smoothness, the even and orderly is decline, the roughness of the surface is increased, the softness is weakened, the bulkiness is reduce, the fullness is weakened, the wrinkle recovery capabilities is improved.

Abstract: Based on experiment, the mix proportion matching with the design and construction requirements is obtained. It meets with the requirement of pump structure on the basis of meeting the strength requirement. On this basis, the basic physical and mechanical performance is studied and the conclusion is that steel fiber high-strength concrete has excellent resistance to splitting, bending and drying shrinkage. The splitting strength and bending strength of steel fiber high-strength concrete named CF60-2 is respectively 38.7% and 56.8% higher than that of plane concrete named C60. The drying shrinkage rate of CF60-2 is 45.5% lower than that of C60 in three days. The results have an important guiding significance to steel fiber high-strength concrete in theoretical and engineering practice.

Abstract: The paper demonstrates the possibility to control the degree of tetragonal zirconia stabilization, microstructure and physical and mechanical behavior of Al2O3 -ZrO2(Y2O3) ceramic composite. Control is exerted via the process variables during deposition synthesis of nanosized composite powders from hydroxide salts, and their subsequent heat treatment and consolidation. Morphology features of nanosized powder systems and microstructures of the consolidated nanostructured materials were characterized by BET surface are measurements, scanning electron microscopy (both standard and HR), and large-angle X-ray diffraction. Correlations are established between microstructure parameters, physical and mechanical behavior of composite ceramics and a degree of stabilization of tetragonal ZrO2.