• General Article

    Probabilistic analysis of reinforced concrete corrosion
    Azhar Badaoui and M’hammed Badaoui
    Reinforcement concrete is the construction material usually used in civil engineering. The uncertain impacts of the environment on his behaviour make it ... + READ MORE
    Reinforcement concrete is the construction material usually used in civil engineering. The uncertain impacts of the environment on his behaviour make it difficult to accurate assessment of the durability of structures with time. Aggressive agents such as chlorides are the most important buildings aggressive agents which may be exposed. They are responsible for one of the main mechanisms of degradation of existing structures. These phenomena are identified by the corrosion due to penetration of chlorides. The speed of reinforcement corrosion depends mainly on the chlorides penetration inside the cement matrix which is determined by the concrete porosity. In this paper, a probabilistic formulation is applied to reinforcement corrosion phenomenon and statistics regarding chloride penetration depth are investigated by performing a parametric analysis which integrates the influence of variation of the chloride ions migration coefficient and critical chloride ion content at the concrete surface. Monte Carlo simulations are realized under the assumption that the chloride ions migration coefficient and critical chloride ion content are random variables with a lognormal probability distribution. The results showed that the corrosion kinetic is affected by pore sizes; the depth of chloride ions penetration tends to increase when the porosity of concrete increases, and the variability of the chloride ions migration coefficient influences slightly the corrosion depth, whereas the critical chloride ions content controls the speed of reinforcement concrete corrosion by causing a delay in the corrosion process. - COLLAPSE
    June 2019
  • General Article

    Evaluation of the workability, marshall parameters, and the stiffness modulus of rubber modified bituminous concrete
    Sadoudi Lyacia, Mitiche-Kettab Ratiba and Si Bachir Djaffar
    The traffic concentration and the temperature rise are considered as the main causes of road aggravation. These constraints require the exploration of ... + READ MORE
    The traffic concentration and the temperature rise are considered as the main causes of road aggravation. These constraints require the exploration of new research directions to improve the performance of the ordinary bituminous concrete. This study presents the evaluation of the workability, Marshall Parameters, and the stiffness modulus (for three level of temperature) of rubber modified bituminous concrete using gyratory compactor, Marshall Method and the Nottingham University apparatus. For this another type of crumb rubber compacted with zinc oxide, made of waste comes from the recovery of soles of shoes and carpet of vehicles is used in order to improve the performance of asphalt on the one hand and to preserve the environment from pollution on the other hand. The crumb rubber is added to the mixture using the dry process. For the identification of the mechanical behaviour, impact tests have been conducted according to the gyratory compactor test and Marshall Method. To assess these properties a control and modified mix were prepared with optimum content of 40/50 pen bitumen, different fractions of aggregates and various percentages of the crumb rubber. The percentages of the rubber add to the mix are estimated using test of workability. The results obtained of the properties of modified mix indicate that the introduction of rubber to the control mix at deferent percentages of crumb rubber (0.25%, 0.5% and 0.75%) gave a workable mixture. However, the best performances of the mixture are obtained at a percentage of 0.25%. These performances indicate higher resistance to permanent deformation and rutting. - COLLAPSE
    June 2019
  • General Article

    A study on the major construction materials of non-residential buildings from the viewpoint of major environmental impact
    Jihwan Yang and Sungho Tae
    The purpose of this study is to perform LCA (Life Cycle Assessment) more efficiently in the non-residential building field which is not ... + READ MORE
    The purpose of this study is to perform LCA (Life Cycle Assessment) more efficiently in the non-residential building field which is not different from residential building. For that reason, we will improve the efficiency of LCA for non-residential buildings by analyzing the key building materials that we must know to assessment. The main materials derived from this study include RMC, Rebar, Steel Frame, Glass, Brick, Cement, Aggregate and Iron in common. In addition, the general building has Gypsum, and the commercial building has stone as the ninth major material. By replacing the derived materials with the values of the three environmental impacts required by the Korean green building certification system G-SEED, it is possible to check the errors compared with the values already evaluated in the practical work and verify that they are applicable in actual work. As a result, it was analyzed that the materials derived from this study alone are sufficient to carry out LCA. If LCA is performed using these main materials, it is expected to be more efficient in terms of time and cost. - COLLAPSE
    June 2019
  • General Article

    Calculation of particulate matter formation of major building material in construction phase through life cycle impact assessment
    Rakhyun Kim and Sungho Tae
    The purpose of this study is to analysis of particulate matter of major building material Construction phase through life cycle impact assessment ... + READ MORE
    The purpose of this study is to analysis of particulate matter of major building material Construction phase through life cycle impact assessment. For this purpose, the theoretical consideration of the life cycle assessment and environmental impact category was performed and the direction of the study was set up. That is, the major material in the global warming potential view was drawn against the building and LCI database was selected. The classification was performed about 4 kinds of substance and impact index, such as particulate matter formation (PM10), that it specifies in ReCiPe 2009. And the environmental impact of particulate matter for the construction material production stage was calculated through the characterization. Meanwhile, the environmental impact of construction material in the same category was analyze based on the characterization impact which was calculated in this study. The amount of PMF emission factor was the most in plate glass (1.70E-02 kg-PM10-eq/kg). It was analyzed that PM10 was generated in the electric furnace for manufacturing glass products made of silica sand and crushed glass. - COLLAPSE
    June 2019
  • General Article

    Adaptation of a new material nonlinearity rheological model for a RC cantilever subjected to a biaxial earthquake excitation
    Belhadj Ahmed Fouad, Belhadj Fatma Zohra and Chabaat Mohamed
    The main objective of this paper is to develop a rheological model for reinforced concrete (RC) structural systems excited by digital acceleration ... + READ MORE
    The main objective of this paper is to develop a rheological model for reinforced concrete (RC) structural systems excited by digital acceleration taking into account only the material nonlinearity. It is shown that a macro-fiber model offers a reasonable approach for a global analysis of reinforced concrete structure, considering different generated phenomena with respect to such nonlinearity. Besides, the quantification of a response requires use of methods that consider the particular transformation of the reinforced concrete structure towards the system in each instant of the lasting signal. - COLLAPSE
    June 2019
Journal Informaiton International Journal of Sustainable Building Technology and Urban Development International Journal of Sustainable Building Technology and Urban Development
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