Advanced Materials Research Vol. 1051

Abstract: Fine Grained Mortar (FGM) offers a new innovative technology binder system to strengthen or repair concrete structures. The innovative technique is achieved by using a small maximum grain size of 1 mm for the mortars. Therefore, less than 2 mm of mortar thickness would be fitted between the strengthened layers. FGM also has high binder contents, by adopting different pozzolanic additives and high performance of plasticizers. Recently, the utilisation of supplementary of cementing materials such as Fly Ash (FA) and Rice Husk Ash (RHA) has a become an important in concrete industry. It has demonstrated significant influence in improving the strength of mortar. Most of the previous studies have focused on the FA to be replaced in the FGM. There is still lacking of research of using other pozzolanas in making FGM. This paper presents an overview on the use of FA and RHA as partial replacement of cement in mortar and FGM as well as future research that will be conducted by the authors.

Abstract: Durability, acceptable indoor air quality, energy efficiency and aesthetics are all pillars of good design in healthy buildings. A new approach for optimizing all four of these pillars is whole-building performance design. This approach involves the consideration of heat, air and moisture (HAM) transfer and control of a building, specifically, how the coupled relations between different transient systems (mechanical system, building envelope, indoor environment, outdoor environment, and occupants) affect the building performance and operation. Ventilation is one of the means of controlling indoor humidity in buildings. Its effectiveness depends on the supply air moisture level and the ventilation rate. The drier the supply air is, the higher its capacity to remove indoor humidity. In a marine climate where the outdoor air is relatively moist, higher ventilation rate is required to achieve the same level of indoor humidity in a cold and dry climate. In this study, the potential benefit of interior gypsum finishing in lowering indoor humidity peaks, through the moisture buffering process, and thereby reducing ventilation rates are investigated. A field experimental study is conducted using two identical test facilities at the Whole Building Performance Research Laboratory in Burnaby, British Columbia to test this hypothesis in a marine climate. Initial benchmarking of the recently commissioned test buildings was undertaken to ensure they behaved similarly under identical conditions. Each building was outfitted with an occupant simulator unit, which provided the humidification that would be produced by occupants. The occupants simulators were programmed based on moisture production data analysis from a real high-occupancy apartment suite, to provide two different moisture generation profiles representing typical and high intensities, scaled down to the size of the test buildings. Following benchmarking, three tests were conducted to evaluate the effect of ventilation rate, moisture generation intensity, and moisture buffering ability of finishing surfaces on indoor moisture levels. Preliminary experimental test results are presented. Future tests will be undertaken to consider other factors such as indoor air quality based on carbon dioxide concentration, heating and ventilation energy consumption, and alternative finishing materials.

Abstract: In recent years, a large proportion of reservoir works in Jiangxi province have emerged different kinds of new diseases, which not only hold back the benefit but also affect the safety of these projects, to some extent. Based on investigating the present situation of dams in Jiangxi province and analyzing the reasons for deterioration condition in reservoir works, the main disease for hydraulic concrete structure of ill-dangerous dams is divided into several typical types and the characteristics of the existing problems are given as well as some control measures.

Abstract: This paper studies landslide and background in Youyu County, Shanxi Province and provides geological bases for the economic and social development, ecological environment construction and protection. The authors investigated the environmental geological background, collected and arranged the information in this field. By analyzing Landslide-causing factors, the area is divided into four types: high susceptible area, middle susceptible are, low susceptible area, difficult susceptible area. A map of Landslide hazard susceptible degree is made, based on the studies of the quantitative indices (formation lithology, slope structure type, gradient, rainfall, slope height, engineering activities, slope deformation features, death and threatened toll, direct and indirect economic loss and so on.).And the Landslide hazard risk of the area is comprehensively assessed.

Abstract: Horizontal earthquake acceleration is used for slope risk analysis, and the relationship between the dynamical safety factors and corresponding static safety factors is obtained. The reliability of anchored slope is expressed with the safety factor. The synthesized risk evaluation index, which included the dynamical, statically mechanics and reliability analysis, is established. The main procedure of calculation is provided by a practical project in this paper, and the computed example has shown it is worthy to study the method further.

Abstract: Based on the understanding of dual symbiosis of landscape, interactive relationship between people and landscape in landscape environment is analyzed in this paper. In addition, basic ideas and methods of landscape interactive design are discussed. After that, combining with landscape interactive design, some researches and analysis of Flexible Landscape are done.

Abstract: In this study, the Al-Li alloy plates were friction stir welded (FSW) at different welding parameters, and the effect of welding parameters on the hardness, tensile and fatigue properties of the butted and lapped FSWed joints were investigated. The experimental results showed that the ultimate strength and elongation of butted joints decreased as the heat input increasing, and the maximum ultimate strength of the joints was equivalent to 83% that of the base material. By comparison of the heat inputs during welding process at different parameter combinations, the relationship between the microstructure and mechanical property of FSWed joints was established. For the overlapped welds made in 2mm thick plates of Al-Li-S4 and 2099 alloys, the hooking defect was a typical and inevitable defect appearing on the TMAZ of both advancing and retreating sides, which would adversely damage the mechanical properties of overlapped joints. Furthermore, the length of pin significantly affected the tensile property of overlapped joints, when the length of pin varies from 2.8mm to 2.5mm, the ultimate strength increased 14% to 20%. In addition, the fatigue lifetime of overlapped joints was lower than that of butted joints and base metal.

Abstract: A numerical study is conducted to investigate the turbulent periodic flow and heat transfer characteristics in a channel fitted with sinusoidal wavy-baffles placed on upper and lower walls. The finite volume method is introduced and implemented with the SIMPLE algorithm. The flow structure, friction factor and heat transfer characteristics for different wavy-baffle configurations are evaluated. According to numerical result, the maximum thermal performance is found to be 1.22–1.66 times to smooth channel corresponding to the baffle a/H=0.75 and b/H=0.10. Consequently, the application of wavy-baffles can be utilized effectively to enhance the thermal performance of solar air heater.

Abstract: The micropumps driven by AC, DC brush, DC brushless or stepper motors can be used in pharmaceutical industry. The particular property of such pumps is magnet coupling between motor and pump. The aim of the analysis has been to investigate the operating conditions for bearing in such pump during flow of water, oil and glycerin – water solution and to investigate the dependency of the glycerin – water solution flow upon the outlet – inlet pressure difference and upon the speed of motor driving pump. It has been also investigated the possibility of application for NdFeB – NdFeB magnet assembly in the magnet coupling. The loading of pump are connected of flow resistance determined by outlet and inlet pressure difference, speed and temperature of pumped liquid, geometry and material properties of pump elements. The driving motor is loaded by mechanical resistance of pump element motion either. The moment – pressure difference relationship and flow – pressure difference – speed relationship have been made for water and oil and then approximated equation for them have been elaborated. With help of such equation scheme of moment – pressure difference relationship and flow – pressure difference – speed relationship for glycerin – water solution have been made for various values of glycerin strength. The model of pump bearing has been elaborated using Finite Element Method. Auxiliary mathematical equations have been utilized for calculating sliding velocity in bearing and loading force. The obtained contact pressure in bearing has been presented in the article. The model of magnet coupling has been elaborated with use of Finite Element Method and presented in the paper. Dimensions of model are closed to the one used in original pump. It has been observed that for up to 50% glycerin - water solution the moment – pressure difference relationship and flow – pressure difference – rotational speed relationship are very similar to these in the water case. With increasing of solution strength above 50% they start to be more different. Values of contact pressure nonlinearly increase with driving moment value increasing. Calculated values of torque excited values given out by manufacturer with about 20%. Calculated value of decoupling torque for NdFeB – NdFeB magnet assemblies is greater more than 50 % comparing SmCo – NdFeB case.

Abstract: A gravity-based power generation apparatus comprises a main body, which comprises a cylinder and coils. When the magnetic ball is affected by gravity, and vertically moves in the cylinder inside, coils generate electrical power by the electromagnetic effect. The power supports to a lighting unit and a USB unit. The apparatus is used as an emergency device, supported a gravity-based flashlight and a mobile USB power. The apparatus is implemented by 3-D printer. The experiment results show idea and apparatus are effective.