Applied Mechanics and Materials Vols. 174-177

Abstract: The artistic expressions of materials in art design activities are increasingly becoming a factor that can not be ignored. This paper analyzes the importance of materials in art design creation and classifies art design materials, emphasizing the sensory properties of materials, such as visual, touch, hearing, smell and taste, etc. Then the paper discusses the aesthetic applications of materials in art design, so as to provide artists and designers with theoretical reference and basis for reasonable choice in art design creation.

Abstract: The Shear capacities of fourteen coupling beams are analyzed in this research by the finite element numerical simulation method. The coupling beams are designed with small span-to-depth ratios and arranged high strength steel. The results show that the shear capacities of coupling beams accord with the compression strut model. The shear capacities improve obviously through enhancing the diagonal steel bars, but they do not show significant influence through changing the strength of transverse and longitudinal bars. Comparing the results calculated by the formulas shown in the Code for Design of Concrete Structures (GB50010-2010), the results calculated by the finite element method show the gap, and it will be the key issue for further study.

Abstract: The development of new generation prefabricated reinforced concrete structure is still at an early stage in China. Reinforced concrete laminated slab, as an important horizontal load carrying member, is paid much attention to in research. Based on the research results about it in China, the progress of which is summarized, including the form, characteristics and experimental research of sandwich laminated slab, anti-ribbed laminated slab, and hollow laminated slab etc. Finally, the further research is prospected.

Abstract: The samples were prepared to study the influence of pH on the formation and stability of thaumasite using Fourier transform infrared and X-ray diffraction to analyze the composition of the samples. The erosion solutions with the pH arranged from 9.5 to 13.5 prepared by sodium bicarbonate, sodium hydroxide and 5% sodium sulfate. The experimental data for three years has been given in the paper. The result of the research indicates that the value of pH at 10.5 is the optimum pH for the forming of thaumasite and when the pH comes up to 11.5, thaumastie can form but it will decompose in the solution.

Abstract: In this paper shucking technique is developed to improve the performance of recycled coarse aggregate concrete. Comparison test has been done to demonstrate the good performance of shucking recycled coarse aggregate concrete than that of common recycled concrete. Simultaneously recycled fine aggregate concrete and recycled finely grinded admixture are extracted and studied too. Results show that this new technique can not only improve the performance of recycled material and enlarge recycled material type, but also make waste concrete to be reused completely.

Abstract: In the building industry, non-destructive testing methods are mostly used to determine parameters of concrete structures and concrete of its own; as to other materials, these methods serve semi-occasionally and, as a rule, testing procedures and evaluation are not codified in technical standards. One of non-destructive testing field of applications is testing of piece bricks. This paper deals with findings concerning non-destructive testing of clay solid bricks, honeycomb bricks and lime sand bricks by means of Schmidt Impact Hammers types LB/L. Described here are testing method, procedures of test finding evaluation as well as calibration correlations between impact hammer rebound number and compression strength or flexural strength (lime sand bricks only). Evaluated calibration correlations between impact hammer rebound number and brick strength feature close correlation; its coefficient varies between 0.95 and 0.98, therefore these values are usable in practice. When testing honeycomb bricks varying in hole arrangement and wall thickness, it is necessary to take both these factors into account through specification of calibration correlation of non-destructive/destructive tests of limited number of bricks.

Abstract: This research focuses on investigating the high performance concrete containing slag with different fineness and dosage. For this purpose, the workability, compressive strength at different ages, and chloride ion penetration were investigated, with slag surface area 420m2/kg, 530m2/kg, 610m2/kg, and 720m2/kg, and replacement percentage 0%, 20%, 40%, and 60%, respectively. It was found that the workability and chloride ion penetration resistance were affected by the fineness and dosage of slag. The 7-day compressive strength decreased with slag replacement increasing when the fineness of slag is lower than 530m2/kg, and 28-day and 56-day compressive strength increased; For the fineness higher than 530m2/kg, the 7-day compressive strength is higher than that of control concrete, when the slag replacement was 40%, the concrete reached the highest value, and the 28-day and 56-day compressive strength increased with slag incorporation.

Abstract: By using PFC2D a numerical specimen of particle aggregates is established. It achieved consistent mechanical parameters of concrete of C35 with the Code for Design of Concrete Structures(GB 50010-2010) by using PFC2D to simulate concrete compression test and it is proved feasible that PFC2D is suitable for simulating compression tests. End friction effect is studied by changing the coefficient of friction of loading plane. The results show that end friction effect will lead to a small cross section in the central and a large cross-section in the end. The compressive strength will increase with the loading plane friction coefficient increases.

Abstract: Compared with natural aggregates (NA), recycled aggregates (RA) have higher porosity and water absorption rates due to the presence of the porous cement mortar. This paper attempts to report several treatment approaches to improve the properties of RA by their impregnation with kinds of chemical solutions. Effects on compressive and tensile splitting strengths of RAC were investigated. The results show that not only the behavior of RA has improved with reduction in water absorption but also a marked improvement in the mechanical properties of RAC.

Abstract: In mesoscopic level, concrete was taken as three-phase composites consisting of aggregate, bond and mortar. Use the Monte Carlo methods, establish random aggregate model of concrete and apply the concrete damage plasticity model. Judge the failure based on the load-displacement curve and then doing the numerical simulation to the specimen on the impact loads. Through CT test, get the CT images of various force stages of the concrete. Compare the damage process picture of the numerical simulation with CT test. Find the failure process of the numerical simulation is similar to the CT test. The results show that the model is right to simulate the damage and fracture of concrete which is under the dynamic load. It is established that the model of the method is feasible.