• General Article

    Environmental impact assessment of polymer cement mortar filling method for structure maintenance
    Seungjun Roh, Sungho Tae, Rakhyun Kim and Daehong Kim
    This study on environmental impact assessment of structure maintenance method selects a method suitable for research on maintenance method and analyzes material ... + READ MORE
    This study on environmental impact assessment of structure maintenance method selects a method suitable for research on maintenance method and analyzes material of the impact indexes of six environmental impact categories of the national life cycle inventory database (LCI DB) about the maintenance method. To this end, it chooses polymer cement mortar filling method which is utilized on construction sites, and conducts an environmental impact assessment about two types of polymers (SBR-styrene butadiene rubber, EVA-ethylene vinyl acetate). It analyzes Materials Life Cycle Assessment (LCA) required for each maintenance method utilizing domestic and overseas LCI DB and derives the impact indexes of six environmental impact categories of the national LCI DB according to each KS standard mixing ratio and proposes a maintenance method to reduce the environmental load. Analyzing the results of the environmental impact assessment, SBR showed higher characterization value than EVA in six environmental impact categories; that is, polymer cement using EVA is a more sustainable technology. - COLLAPSE
    December 2018
  • General Article

    Study on physical properties of quaternary cement concrete with novocon XR steel fibers
    Diptendu Roy, Lokesh Choudhary, Nikhil Sharma and Nikhil Sharma
    From a sustainability perspective quaternary concrete is highly advantageous. In context to the present study, M35 grade concrete (W/C =0.42 & 1.2% ... + READ MORE
    From a sustainability perspective quaternary concrete is highly advantageous. In context to the present study, M35 grade concrete (W/C =0.42 & 1.2% super-plasticizer) was made using quaternary binders such as OPC-43 cement, supplementary cementitious materials (SCM’s) viz. micro silica(SF), flyash class F(FA) and meta-kaolin(MK) in varying proportions by mass. This paper presents the results of the exhaustive study to compare the physical properties of quaternary concrete with and without steel fibers. Novocon XR steel fiber of 1% by volume (RIv = 0.5) was also added to the mix to enhance the ductility, post-cracking, flexural and split tensile strength. The synergistic action of supplementary cementitious materials with cement has a beneficial effect on the strength and in most mixes the strength of concrete showed impressive results with age. With the addition of steel fibers to the quaternary concrete samples, the early strength of the quaternary concrete mixes increased significantly. For instance, mixes with 30% cement replacement had considerably higher workability than the control mix C0. The workability reduced with the decrease in flyash content and increase in micro silica and addition of steel fibers also took a toll on the workability. The compressive, split tensile and flexural strength of the specimens decreased as we go from QC1 to QC5 and S1 to S5 samples. The central deflection at failure for fiber reinforced samples increased by a minimum of 1.27 times for mix S5 at 3rd day and a maximum of 2.53 times for mix S1 at the 7th day of curing. Finally the plot between flexural strength versus compressive strength at 28 days, were in good agreement with the empirical equations of quaternary concrete but the results for split tensile tests versus 28th day compressive strength were lower than the proposed empirical values for both quaternary and fiber reinforced concrete. - COLLAPSE
    December 2018
  • General Article

    Model-based analysis of base isolation systems for multistory buildings subject to various Seismic Events
    Purnima Yadav, Diptendu Roy and Megha Kalra
    The aim of the present work is to study the effect of vibration control techniques on scaled down metal iron frame models ... + READ MORE
    The aim of the present work is to study the effect of vibration control techniques on scaled down metal iron frame models with inverted V-Chevron bracings of varying heights such as 4, 6 and 8 storeys. The models were subjected to five different high magnitude earthquakes excitations. A check in earthquake force transfer and lateral load resistance was achieved using two techniques namely, base isolation with the help of laminated steel rubber bearing and the incorporation of a core structural system. The focus was on comparing the top floor responses between the base isolated and non-isolated buildings model using a uniaxial shake table. Further, the effects of the introducing a rigid core structural system in the non-isolated structure were studied using model analysis. To check the influence of material on structural response, a comparison of the results of 8 storeys wooden and metal iron frame model was also carried out. The interpretation of the result done using Vib’SYS shake table software showed the effectiveness of the base-isolated structure in reducing the top floor acceleration response in a range of 40-80% for all the metal iron structures. The floor displacements decreased by an average of 55% in metal iron structures, up to 70% in wooden structures, and an average of 48% in the core structure. We can thereby conclude that the introduction of lateral flexibility at the base by means of isolation aids in proper energy dissipation at the base hence reducing the seismic demand of the structure and the core structure also enhanced the overall stiffness of the structure which resulted in response reduction. - COLLAPSE
    December 2018
  • General Article

    Contribution to the study of the impact of sulphates, temperature and humidity on the behaviour of Compressed Stabilized Earth Blocks CSEB
    Sihem Chaibeddra and Fattoum Kharchi
    The use of Compressed Stabilized Earth Blocks CSEB as a masonry unit is still growing in many countries because of their low ... + READ MORE
    The use of Compressed Stabilized Earth Blocks CSEB as a masonry unit is still growing in many countries because of their low impact on the environment. However, in addition to being sensitive to weather variations like humidity and temperature, earthen constructions are subjected to chemical agents such as sulphates. This work deals with the assessment of the impact of sulphates combined with temperature and humidity on the behaviour of CSEB in terms of compressive strength and mass loss. Earth blocks have been stabilized with different amounts of two types of cement, namely: CEM II, and CEM I resistant to sulphates. The compressive strengths under humid and tempered conditions were first measured. Physical properties involving shrinkage and thermal conductivity, which are depending on humidity and temperature, were measured based on cement amount variation. A correlation between these two parameters and the compressive strength was discussed. The impact of sulphates combined with humidity and temperature was then investigated. The results show that contrary to humidity, temperature increases the compressive strength as much as the cement amounts rise. Cement dosage favours the thermal conductivity, and opposes the shrinkage. The CEM II is particularly more efficient than the CEM I under the effect of temperature. On the other hand, the compressive strength is weakened in the presence of sulphates. However, the use of CEM I resistant to sulphates at high percentage can make the blocks withstanding the action of sulphates. The mass of CSEB is modified after the exposure to sulphates, humidity and temperature. Sulphates fill the air pores under the effect of temperature through crystallization of products issued from their reactions with cement. This leads to less material losses contrary to water exposure that causes leaching of soluble products. - COLLAPSE
    December 2018
  • General Article

    The development of office buildings design in Cairo and its influence on the external envelope based on a longitudinal analysis
    Shereen Khashaba and M. Moemen Afify
    Office buildings design in Cairo/Egypt has changed in an obvious way since the beginning of the twentieth century, this change affected the ... + READ MORE
    Office buildings design in Cairo/Egypt has changed in an obvious way since the beginning of the twentieth century, this change affected the buildings’ architecture plan, work-spaces, structural system, building materials, external envelope, services and the project site selection. In which the present architecture practice of office buildings in Cairo is strongly affected by the modern movement of office buildings design worldwide. This paper illustrates a historical background of office buildings constructed in Cairo, identifying the start of the office buildings design, and the development of the functional office buildings we know nowadays, and how this development affected the external envelope (fenestration and opaque parts) design as a response to technological, environmental, socio-cultural and functional changes. To figure out the main trend of office buildings’ design in Cairo now and then; this is accomplished through empirical review and longitudinal analysis of office buildings in Cairo built over years since 1948 until now as samples for the study and clarified on a timeline. To conclude the main changes that affected the office building and its envelope design form, materials, colors, texture, and green features applied to it. And to conclude its causes and consequences. - COLLAPSE
    December 2018
  • General Article

    Mineral’s creation of recycled cement utilizing inorganic construction wastes
    Jihoon Kim, Sungho Tae and Rakhyun Kim
    Recently, the problem about environmental pollution and resource depletion has been increased in the construction industry. The enormous resources are consumed in ... + READ MORE
    Recently, the problem about environmental pollution and resource depletion has been increased in the construction industry. The enormous resources are consumed in the production activities and many construction waste in the new construction, demolition and recycling of the building has been generated. In this study, the purpose is to analyze the mineral’s creation of recycled cement as a part of development of recycled cement utilizing inorganic wastes in order to solve the problems of natural resource depletion and environmental impact. So, through the analyzing the chemical components of the construction waste combined based on the OPC (Ordinary Portland Cement). And the mineral composition component of clinker that is generated by the firing in 1450 (degrees Celsius) was analyzed performed using optical microscope and XRD (X-ray diffraction) analysis equipment. As a result, four major mineral of the cement have been confirmed and the development of recycled cement using an inorganic construction waste will be possible. - COLLAPSE
    December 2018
  • General Article

    Evaluation of visual comfort with daylighting levels using Daysim in different transparency and orientation in the UK
    Sungwon Jung and Choulwoong Kwon
    This paper reveals daylighting performance with diverse transparency of canopies in the different locations in the UK. Numerical study of using Daysim ... + READ MORE
    This paper reveals daylighting performance with diverse transparency of canopies in the different locations in the UK. Numerical study of using Daysim software for Daylighting measurement is carried out with visual representation and daylight autonomy in the space. This study shows the need for daylighting evaluation in the process of design with different variables (e.g. window area, canopy size or transparency, etc.) so that it may be used to provide optimum daylighting levels for students in different areas. Recent climate changes make schools equip with shading devices, but sometimes it prohibits daylighting from coming to provide visual comfort. Different shading devices are adopted for Daysim software which is most popularly available to calculate Daylight autonomy. The results show electric lighting energy does not show linear match with daylight autonomy (DA) in the classroom due to the glare. Combined daylighting simulation is essential to design canopy and estimate energy consumption as transparency of canopy and orientation of the classroom window plays an important role in controlling the amount of daylight. - COLLAPSE
    December 2018
  • General Article

    Evaluation of basic performance of concrete using a penetrating water repellency based on cement reactive siloxane polymer
    Myungju Park, Seungjun Roh, Daehong Kim, Kyunam Jeon and Jaeho Noh
    This study is a part of research on the development of cement reactive siloxane polymer-based penetrating water repellent, and its goal is ... + READ MORE
    This study is a part of research on the development of cement reactive siloxane polymer-based penetrating water repellent, and its goal is to perform basic performance evaluation of the concrete, to which the penetrating water repellent was applied. To this end, reactive urethane prepolymer that coats micro-pores of concrete was fabricated based on the polysiloxane, and oil-based and water-based penetrating water repellents, UP-40 and UP-50C, respectively, were fabricated by controlling the molecule size and modifying the surface. Concrete specimens of three compressive strengths (18 MPa, 24 MPa, 30 MPa) were fabricated, and the depth of penetration was measured according to the application method of penetrating water repellent (brush, immersion, and spray methods), and the compressive strength, water absorption resistance, and water permeability resistance were evaluated for the penetrating-water-repellent-applied concretes. In the results, the depth of penetration of penetrating water repellents was in the range of 2.7-9.2 mm according to the strength of concrete and application method, and the evaluation revealed that as the compressive strength of specimen increased, the penetration performance penetrating water repellent decreased. Furthermore, when the penetrating water repellent was applied, there was very little change in the compressive strength while excellent water absorption resistance and water permeability resistance were demonstrated. - COLLAPSE
    December 2018
Journal Informaiton Agriculture and Life Sciences Research Institute International Journal of Sustainable Building Technology and Urban Development
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