Advanced Materials Research Vols. 476-478

Abstract: A novel multilayered flower-like structure of BiOBr was fabricated by mild and facile polyvinylpyrrolidone (PVP) K30-assisted hydrothermal method using stable, less toxic inorganic salts Bi(NO3)3•5H2O and NaBr as the starting materials. Such three-dimensional (3D) BiOBr assemblies were constructed layer-by-layer from a large number of two-dimensional (2D) nanoplates. Rhodamine B (RhB) photocatalytic degradation experiments showed that the BiOBr flowers exhibited higher visible-light photocatalytic activity than that of irregular BiOBr nanoplates. Therefore, the resulting flower-like BiOBr are very promising photocatalysts for the treatment of organic pollutants

Abstract: With the rapid development of wooden structure buildings in China, the demand for structural plywood enlarges significantly. Eucalyptus and poplar plantation is a very wide area of growth in china, therefore, there is practical significance to use eucalyptus and poplar plantation to produce wooden structural plywood. This study uses orthogonal test on pressing temperature, pressing time, pressing pressure, veneer glue spread - four factors influence the bond strength of structural plywood from Eucalyptus/poplar, and has obtained the superior technology. The results show that hot pressing temperature, pressing time, pressing pressure, veneer glue spread –four factors affect the bond strength of the structure plywood significantly, but the difference among the three veneer glue spread levels is not significantly. The better production technology is hot pressing temperature 135 °C, pressing time 24 min, pressing pressure 1.2 Mpa, veneer glue spread 320 g/m2.

Abstract: Stainless steel develops in 21th century, which further extends its application in architectural industry and fields of structure. Based on the idea of sustainable development, this paper analyses the outstanding features that stainless steel possesses compared with other metal materials, trying to apply for a general outline for architect and those concerned. It examines the sustainability of the application of stainless steel, and matters needing attention in architectural design, and it prospects the outlook of stainless steel.

Abstract: The composite samples using flint clay, andalusite and silicon carbide as starting material are made from the proportion of 35:60:5, 45:50:5, 55:40:5, 65:30:5 respectively. The samples are sintered at 1200°C,1300°C,1400°C,1450°C and 1500°C holding 4hrs separately. Both microstructure and mechanism of oxidation were analyzed by XRD and SEM. The results show that the samples have good resistance against oxidization below 1500°C, only the sample of fourth formula perform excellent and have the thinnest oxidation layer between all the formulas at 1500°C.

Abstract: The whole bearing compressive process under eccentric compression is analyzed for the further study of bearing compressive capacity of GFRP tube filled with SHC（steel-reinforced high-strength concrete）columns subjected to eccentric compression. Based on finite strip method from the plane cross-section assumption, the computation program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is formulated according to the existing retrofit theory and related technical procedures. The relation curves of load-deformation, as well as the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation is obtained by means of this calculating program. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and provides a basis for practical design

Abstract: Through the three-point bending test on the specimens of steel fiber reinforced high strength concrete (SFHSC), the effects of influencing factors including water-cement ratio (W/C) and the fiber volume fraction (ρf) upon the critical value(JC) of J integral were studied. The results show that the variation tendencies of JC are different under different factors. JC meets the linear statistical relation with W/C, ρf, respectively.

Abstract: A new type of steel / reinforced concrete composite open-web floor / roof structure is proposed. Its formation is a two-way intersectant open-web beam plate. The lower layer is a rib lattice that is composed of U-style steel slabs infilled with RC, the upper layer is assembled with pre-cast RC slabs and post-cast RC ribs, the connections of upper layer and lower layer are RC shear-bearing blocks. The plate has the specialties of lightweight, simple inside sight sense, high stiffness-weight ratio, and less seismic inertial force. Its formation, construction process, design method and main mechanical specialties are discussed.

Abstract: Concrete buildings in coastal area are dual attacked by chloride and sulfate easily. The erosions make great damage to buildings. This research develops a new type of antiseptic and corrosion-inhibiting admixture for concrete. It is a kind of inner-adding inorganic powder and made up by compaction component, corrosion-inhibiting component and sodium nitrite. The test results show that this admixture has the ability to resistant chloride and sulfate erosion, the admixture also can prolong service life of buildings which are exposed to high concentration of chloride and sulfate.

Abstract: As the technology develops, digital image processing technology has become a necessarily new method for studying particle property and particle analysis. This method helps researchers to gain deeper understanding of microstructure and powder particle property. In the paper work, the characteristics of different ingredients of cement microscopic property are analyzed with the technology of SEM backscattered electron image. Based on experimental analysis, microstructure and all kinds of cement characteristic parameters are analyzed quantificationally. It is seen that this method in the paper effectively and comprehensively computers the microscopic characteristics parameter of powder.

Abstract: The comprehensively modified effect of cement, VAE emulsion and self-made acrylic varnish on mechanical and water-resistant properties of gypsum sample was investigated and microstructure of gypsum sample was analyzed. Experimental results exhibit that absolutely dry flexural strength, absolutely dry compressive strength, water absorption and softening coefficient of gypsum specimen with admixture of 10% ordinary Portland cement and 6% VAE emulsion and acrylic varnish coated on its surface can respectively reach to 5.11MPa , 10.49 MPa, 8.32% and 0.63, respectively.