جستجوی مقالات مرتبط با کلیدواژه « material properties » در نشریات گروه « عمران »

The use of 3D printing concrete in construction applications is one of the most innovative and challenging fields, combining traditional construction knowledge with digital technologies. The focus on this area has increased due to removing the molds, reducing the cost, needed human resources, and other important advantages. There are many challenges such as rheological requirements, bonding between layers, materials used, their reinforcement, and anisotropic behaviors in this industry which has a special potential in fast and mass construction, and complex architectures. Throughout history up to current times, the performance of the built structures has always been the result of the interaction between steel and concrete. According to the practical applications of this technology, manufacturing compatible materials, using reinforcing systems such as fibers and steel rebars, and maintaining proper interaction between them, are fascinating subjects that attract the attention of researchers in this field. The examples of the research processes along with their analysis are reviewed in this article. since this article was written to introduce this technology and its challenges, it provides a source of inspiration, for getting to know the audience as much as possible, with conflict goals of producing suitable concrete to improve the ability of printing and its quality.

One of the most fundamental issues in road construction is to increase the density and strength of the layers of stone materials to the desired level;. For this purpose, the different layers of the pavement should be compacted to an acceptable extent by means of asphalt rollers. On the other hand, the performance of the pavement aggregate layers, which is highly effective on the performance of the entire pavement, is influenced by their compaction. Therefore, it is very important to investigate the factors affecting the field compaction of the pavement layers including the base layer. As a result, this research aims to examine the effect of the characteristics of the base layer materials on their relative compaction using the response surface methodology. For this purpose, the characteristics of stone materials including moisture content, dry density, optimal moisture content, the thickness of the base layer, maximum ambient temperature, minimum ambient temperature, the plasticity index, the sand equivalent value, and uniformity coefficient were extracted from the laboratory sheets related to Dahaghan, Kohpayeh and Shahrekord projects and then analyzed using Design Expert and SPSS software. The results show that the relative compaction has an inverse relationship with laboratory dry density, layer thickness, maximum temperature, the plasticity index and the sand equivalent value. Furthermore, we show that there exists a direct relationship between relative compaction and the minimum temperature and the uniformity coefficient.