Papers by Keyword: Behaviour

Abstract: This study deals with determination of the properties of the fine recycled aggregate (FRA) concrete with partial replacement of natural sand in concrete mixtures. The FRA was obtained from concrete waste and crushed on fraction 0 – 4 mm by laboratory jaw crusher. The geometrical and physical properties of natural sand and the FRA were tested. The main goal of this study is evaluation of the basic physical and mechanical properties of the concrete with partial natural sand replacement by the FRA such as workability, water absorption capacity, compressive strength and flexural strength. A total four concrete mixtures were prepared. The first concrete mixture was prepared only with natural sand, did not include the FRA. In other concrete mixtures, natural sand was replaced by the FRA in various replacement ratios (40 %, 50 %, and 60 %). All concrete mixtures were designated with the same parameters for clear comparison. The workability of fresh concrete mixtures and physical and mechanical properties of hardened concrete were tested.

Abstract: Low-carbon community (LCC) has recently attracted attention of many researchers and tackled the government attention from various countries, which ones may give different interpretations on the concept. Thus, awareness of low carbon behavior among residents should be accurately measured. But first, residents’ need to have a thorough understanding of what is the real definition of low-carbon awareness and behavior. This paper proposed an analysisof low-carbon awareness and low-carbon behavior concepts. We first divide the types of residents’ low-carbon main concepts into two categories; low carbon awareness and low carbon behavior through which the components to each category are identified. Then we provide a systematic comparison of allthree most frequently mentioned components in low-carbon awareness including low-carbon value, low-carbon attitude, low-carbon knowledge and finallyabout low-carbon behavior.The residents’ low-carbon awareness-behavior gap will then beingidentified and discussed.Finally, differences and similarities among the two residents’ concepts have been summarized.

Abstract: The characterization, modeling and the simulation of the mechanical processes represent components of the analysis process of the systems, representing the tools that allows the analysis, the detection and easier identification of the problems and the solutions. The action of the the mechanical systems with "pneumatic engines" shall be detailed in the article, the characteristics and the evolution of these engines as they are integrated in the various systems. The simulation of the mechanical systems use complex programs, specialized, programs that consider a lot of factors to determine the most precisely behavior and the evolution of the analyzed system. The results of the simulation and the prospection of the specific documentation shall be specified in the article, as well as identifying these "pneumatic engines" purposes and their limits.

Abstract: Masonry viaducts are complex structures. They often have hidden aspects which make an important contribution to behaviour. The author is concerned to provide analytical tools for first level bridge assessment. Such tools must represent real behaviour adequately and conservatively. They must also provide the bridge owners of an indication of when and how a structure might become unserviceable. Finally, the analysis should be capable of providing guidance on strengthening where that becomes necessary.

Abstract: The aim of this study is to present a model for assessing the dynamic compression behaviour of a micro-concrete. This model is based on the results of numerous tests providing the developments of the mechanical characteristics of the material on a wide range of strain rate from 10^-4s^-1 to 10⁺³s^-1.The Split Hopkinson Pressure Bar (SHPB) dispositive, based on the wave propagation theory in materials, has-been adopted to carry out the dynamic tests on the investigated material. The proposed model is composed of two terms, each characterizing the different contributions noted in the two major explored areas of strain rate.

Abstract: The prestressed concrete deck-tied arch bridge doesn’t only have a long span, good appearance and economy, but also have the characteristics of low requirements to the foundation. It changes traditional tied arch bridge into deck-tied arch bridge, which looks like sunflower-shaped arch and prestressed steel strands are embedded in box girder on the top of the arch. Taking Yingbin Bridge as engineering background, the reasonable analysis model was established and behaviour of the bridge under design load was analyzed. The results shown that the design project is reasonable, prestressing force embedded in box girder can balance horizontal thrust in arch bridge effectively, improving the internal force of the main arch ring.

Abstract: Water user association(WUA) was considered as an effective means of solving water shortage problem. Famers’ enthusiasms of participation in WUA were not high in inland arid regions of northwest China. The research sought factors influencing farmers’ behavioural attitudes to WUA. We took the middle basin of Heihe River as study area, by an empirical investigating method with questionnaire, used the analysis of logistic regression model, to explore factors affecting farmers’ behaviours toward WUA. The emperical results showed that following factors were most important for farmers to join a WUA: (1) The farmers personal characteristics such as education, being a village cadre, and health status; (2) The family factor was the decision making of planting structure; (3) The natural endowment factors were area of water right and land patch. Finally, recommendations were put forward to provide possible references for water authorities.

Abstract: The aim of the study is to analyze attitudes and behavior toward exercise one hour every day by means of questionnaire survey method by using7150 parents of students in primary and secondary schools in Zhejiang province as research object.The result shows parents are very concerned about whether their children is sick,but does not care about whether their fitness is good.Exercise time for most students during weekends and holidays at home is less than one hour a day.Parents have misunderstood to some extent as for the concept of physical training,awareness and exercise behavior.In view of parents’ erroneous zone of manner and behavior on “exercise one hour everyday”,this article put forward the corresponding proposal.

Abstract: The green space of students’ living area is an important part of Chinese university campus. It has a close relationship with students’ daily life, study and amusement. In recent years, as the campus has been being newly-built or rebuilt, green spaces in students’ living area have been greatly improved. However, a survey shows that many students are not satisfied with these green spaces. In order to find out problems existing in landscape design of these green spaces, this paper, from the perspective of environmental psychology, investigated and analyzed students’ behaviors and corresponding psychology in these green spaces by taking Chang’an campus of a university in Xi’an as a case. On this basis, this paper attempts to conclude experiences and lessons in designing green spaces of students’ living area, and hopes to provide some useful references for the design of campus landscape.

Abstract: Boric acid (H₃BO₃) is often used for cooling the heat in nuclear power plant. Though the drastic measures have been taken, the potential leakage still can not be fully eliminated. Therefore, an attempt to understand the durability mechanism of RC subjected to boric acid is of vital importance. In this paper, specimens cured in a standard moist room at a temperature of 20 ±3 °C after 28days were immersed in three different concentration of boric solution (2000ppm, 8000ppm, 30000ppm) artificially simulated to accelerate the corrosion of acid environment. The hydration products are investigated. Microstructure of reinforced concrete on the surface, 2cm and 4cm away from the surface at ages of 60, 90 and 150 days are examined using X-ray diffraction (XRD) and scanning electron microscope (SEM) respectively. Results indicate that main hydration product is Ca(BO₂)₂,boric acid corrosion to concrete surface can only be detected from the specimens in 30000ppm solutions at the ages of 150 days and its effect is slight. However, the inner part of the concrete was not affected. The results of XRD coincide with those of SEM.