Journal of Building Material Science
EISSN : 2630-5216
Published by: Bilingual Publishing Co. (10.30564)
Total articles ≅ 33
Latest articles in this journal
Journal of Building Material Science, Volume 2; https://doi.org/10.30564/jbms.v2i2.2870
Fibers reinforced composite materials offer a combination of strength and modulus that are either comparable to or better than many traditional metallic materials. The research on natural fiber based composite materials fit well into this ecological image. This paper reports the conduction mechanism and ac conductivity, activation energy behavior of Polypropylene and banana fiber reinforced thermoplastic composites. Polypropylene [-CH2-CH2-CH2-]n and different fiber content (wt. %) of polypropylene-banana fibers (natural fiber) composites were fabricated using a hot-press molding system. The optimum fabrication parameters were established (initial pressure, temp. etc.). These composite test samples were fabricated so the short fibers were randomly oriented in the matrix. The detail investigation of the a. c. conductivity and conduction mechanism of polymer composites would provide information about the relaxation processes, activation energy etc. which are dependent on frequency, temperature and time. The activation energy involved in the above processes can also be estimated from this study. The measurements were performed over a wide range of frequency of 60 Hz to 3 MHz and temperature range from 30°C (303°K) to 110°C (383°K). Experimental results of the ac properties of pure polypropylene and polypropylene-natural banana fiber composites were compared. It has been established that the fabricated composition changes its insulating property after adding the natural fibers and gives the better conductivity properties.
Journal of Building Material Science, Volume 2; https://doi.org/10.30564/jbms.v2i2.2906
This paper describes economical strategy for design of industrial electrical substations and control buildings. Limited literature addressed design aspects for this class of buildings. Furthermore, little guidelines are available in practice to regulate this type of steel construction. The first part of the paper overviews the architectural and structural layouts of various industrial buildings. The economical aspects and cost savings resulting in using mobile buildings are discussed. The paper also highlights the engineering challenges that are encountered in the design of mobile facilities. The transportation procedure and design requirements are briefly described. Recommendations are provided to compute the combined center of mass of the building and interior equipments. Effective analysis procedure is also described. The proposed design concept for mobile industrial buildings is cost effective and can be implemented in industry to reduce projects cost.
Journal of Building Material Science, Volume 2; https://doi.org/10.30564/jbms.v2i2.2768
With regard to the environmental aspect it would be very interesting if natural fibers like banana, jute, and coir could be used instead of artificial fibers and synthetic products as reinforcement in some applications. Banana .Natural fibers have many advantages compared to other man made fibers. The natural fiber composites may be used in everyday applications such as lampshades, suitcases, paperweight, helmets, shower and bath units. Polypropylene composites were fabricated with untreated and alkali treated jute fiber with 10-25% loading of fiber by weight and were designated at Polypropylene Banana Composite (PPBC). The composites of biodegradable Polypropylene (PP) reinforced with short jute natural fiber was prepared by melt mixing followed by hot press molding. The micro structural analysis and morphologies of the composites were studied via infrared spectroscopy (IR) and Scanning electron microscopy (SEM) techniques respectively. The extensive application of infrared spectroscopy is mainly due to the concept of group vibration. Any structural change like substitution or addition of groups or atoms in a molecule affects the relative mode of vibration of the group. This causes change in IR spectral band position, change in relative intensities and appearance of new bands and disappearance of any band and splitting of a single band into two or more bands. Infrared spectroscopy can also be used to increase the utility of fiber. It deals with the interaction of infrared light with matter. The former can indicate the presence of functional groups qualitatively and the latter can provide a semi quantitative measure of their concentrations. Electron Microscopy is most widely used to obtain information regarding the morphology of fiber surfaces, especially SEM (Scanning Electron Microscopy). Using SEM, it is easy to determine the differences of fiber surface topography after and before treatment, and hence the formation of fiber polymer composites. Fiber deboning was also observed for untreated and treated fiber pp matrix composite. It reveals that bonding between the fiber and the matrix at the interface may be improved. These indicate that there are some kinds of interfacial contact between fiber and pp matrix due to fiber treatment. The SEM can have a magnification range from a few times to several hundred thousand times.
Journal of Building Material Science, Volume 2; https://doi.org/10.30564/jbms.v2i2.2759
In this digital era, usage of electric and electronic devices has become the need of people. Evolution of technology triggers the adoption of new devices over old and discarded appliances turned into the electronic wastes also termed as e-waste/s. E-waste from any source has become a major concern to the society. The disposal of these wastes into the landfills causes many hazardous impacts to the ecosystem. As a promising solution construction industry can utilize the e-wastes effectively. The wastes may be used either as fine filler or aggregates in concrete and bituminous based constructions efficiently. Usage of waste/s conserves the natural resources also. Present study magnifies the scenario of application of electronic wastes in different forms i.e., plastic, metal etc. in bituminous and concrete based mixtures. A critical review has been carried the effects of electronic wastes in concrete and bituminous mixes and findings confirm the praxis of electronic wastes is possible within certain limits.
Journal of Building Material Science, Volume 2; https://doi.org/10.30564/jbms.v2i2.2792
The fatigue life of asphalt concrete is often related to environmental condition, loading condition, ageing, material composition and properties. This work investigates the influence of short and long term ageing of laboratory beam specimens, asphalt content, and testing temperature on fatigue life of asphalt concrete wearing course. Slab samples of (30 x 40x 6) cm have been prepared, beam specimens of (40x 5x 6) cm were cut from the asphalt concrete slab samples. Beam specimens were tested for fatigue life under the influence of three levels of micro strain (250, 400, and 750) at (5, 20, and 30) °C before and after practicing long-term aging. It was observed that the fatigue life decreases by (85 and 97) %, (87.5 and 97.4) %, (71.4 and 95.2) % after increasing the applied microstrain from (250 to 400 and 750) μƐ for control mixture and for mixtures subjected to short-and long-term ageing processes respectively. The fatigue life increases by (142.8 and 257.1) %, (34.4 and 57.8) % and (10 and 30) % when the asphalt content increases from (4.4 to 4.9 and 5.4) % for specimens practicing the applied microstrain of (250, 400 and 750) μƐ respectively. It was concluded that the fatigue life increases by a range of (two to fifteen) folds when the testing temperature increases from (5 to 20 and 30)°C respectively.
Journal of Building Material Science, Volume 3; https://doi.org/10.30564/jbms.v3i1.3149
Road constructing in Ethiopia is increasingly in demand to meet its medium and long term development programs. Most internal road of Oromia cities/town are cobblestone and gravel. Some portions along the alignment proposed and existing roads traversed low resistance of the subgrade that affect the stability of upper layers of cobblestones. Structural failures are observed on cobblestones roads, would it be constructed by good quality or low quality of materials. Nekemte Cobblestones Projects have been started in 2014 widely which were failed in most area today as we observed that needs to be addressed and a corresponding remedial measures must be drawn. A possible remedial measures had been organized for every observed failure or destroyed to obtain normal road condition of the study area. An assessment was made by using observation, interviews, laboratory and field test to determine the adequacy of the cobblestones, underlain material to serve as a subgrade for road construction based on project specifications and Ethiopian Road Authority (ERA) low volume road Specification. From the field tests and laboratory tests carried out, it is observed that the causes of cobblestone road failures of this road section are mainly due to the construction steps/sequence, quality of materials, road construction time, lack of proper design and quality control, absences of drainage structures, lack of highly compaction, lack of accurately fill fine aggregate and suddenly high loads vehicle applied on cobblestone road.
Journal of Building Material Science, Volume 3; https://doi.org/10.30564/jbms.v3i1.3142
The problem of environmental pollution and health hazards due to inappropriate solid waste disposal is critical in developing countries like Ethiopia, Nekemte town is one of the town in Ethiopia facing from environmental pollution due to lack of appropriate dumping site which leads pollution of surface and ground water and environment in and around dumping area. Therefore, the main objective of this study is selection of suitable site for disposal of solid waste using Geographic Information System (GIS) tools. Selection of the most suitable landfill site was determined through the integration of geographic information system (GIS) tools, multi criteria decision analysis and remote sensing techniques. To select suitable landfill site several parameters were considered such as slope, built up area, , road, surface water, land use/land cover, geology and soil. After analysis of suitability of solid waste disposal site using GIS tools and weighted analysis methods selected 36 areas for medium solid waste Bins. Suitability map was prepared by overlay analyses on GIS based Weighted Linear Combination analysis to select the suitable solid waste disposal sites and assigned as the value given 1; unsuitable, 2; less suitable, 3; moderately suitable ; 4; Suitable and 4; highly suitable were determined. Using this method selected 2 highly suitable areas for land fill and inclination area
Journal of Building Material Science, Volume 3; https://doi.org/10.30564/jbms.v3i1.3141
When the installation of cables and pipelines needs to go across rivers, bridges are usually adopted to support the cables and pipelines for crossing the rivers. The measure can make full use of the space resources and have no effect on the flow pattern of rivers. For this reason, analysis on the structural-type design of a large-span steel truss bridge specially used for cables has been performed. The numerical results indicate that the stayed-cable bridge with steel truss beam and concrete main tower has better performance and improved structural type caparisoned with that of the beam and arch bridges, and the construction of the major beam can be without the temporary support.
Journal of Building Material Science, Volume 3; https://doi.org/10.30564/jbms.v3i1.2929
This research aims to know the function of Traditional House of Toraja and Typology, as a unique traditional architectural tourist attraction in Ke'te 'Kesu'. The research is qualitative research. Data collection is done by observation, interview, and documentation. The research variables consist of: Function of Traditional House (Tongkonan), and it’s Typology. The data analysis technique used is descriptive qualitative analysis, that is analyzing each variable descriptively, consisting of four activity flow, that is data selection, data presentation, analyzing, , and conclusions. The results show that: In general, the main function of traditional Toraja house (Tongkonan) and its built environment is as a container of human activities supporting Toraja culture, consisting of Rambu Solo’ that is the customary ceremony associated with death, and Rambu Tuka’ or all things good lifestyle as well ceremonies related to daily life. Then typology can be viewed from aspects of Layout, Spatial, Shape, Structure and Construction, and Ornaments.
Journal of Building Material Science, Volume 3; https://doi.org/10.30564/jbms.v3i1.2949
Tensile strength of concrete were examined on its partial replacement of cement and sand using ground granulated blast furnace and quarry dust, the study examines its behaviour at different dimensions, this is to monitor the variation effect of these parameters on the growth rates of tensile to the optimum curing age, these includes non linear conditions of tensile state, non-elastic and its brittle behaviour at all times as it express zero conditions in tension, this means that it has the ability to with stand pull force, it also reflect its weak ability to handle shear stress thus tends to cause deformation in material as it has poor elasticity. The reflection of its brittle influence the rate of tensile behaviour from concrete ductility, these are known to be a material on modern mechanics of concrete. These also considered as quasi brittle material, this behaviour were reflected as the system considered evaluating the growth rate of tensile strength that replaced cement and sand with these locally sourced addictives. the developed model monitor other reflected influential parameters such as variation of concrete porosity due it compaction in placements, tensile behaviour reflects these effect that subject it to mechanical properties of concrete, the study expressed the reaction of these parameters in the simulation, the evaluation of these affected the details variation of tensile growth rate at different water cement ratios and curing age, the tensile behaviour that were monitored are based on these factors in the study, these derived model were validated with Jaharatul et al 2018, and both parameters developed best fits correlation, the study is imperative because the system expressed the behaviour of tensile strength from concrete at different dimensions, experts can applied these concept to monitor tensile behaviour considering these parameters in its growth rates.