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Study of the Mechanical Performance of a Recycled Aggregate Concrete with Admixture Addition

Open Journal of Civil Engineering 2013年第2期3卷 99-103页

作者： Larbi Belagraa miloud beddar Department of Civil Engineering M’Sila University M’Sila Algeria Laboratory of Materials and Electronic Systems (LMSE) Faculty of Sciences and Technology Bordj Bou Arreridj University Bordj Bou Arreridj Algeria

The needs of the construction sector are still increasing for concrete. However the shortage of natural resources of aggregate could be a problem for the concrete industry. In addition, the negative impact on the environment is due to the construction demolition;where disposal wastes create a severe ecological and environmental hazard. In the last decade, a major interest has been developed for the reuse of recycled aggregates that present more than 70% of the concrete volume. The reused products should fulfill the requirements of lower cost and better quality, in order to establish its role in the concrete. The aim of this study is to assess the effect of the local admixtures on the mechanical behavior of recycled aggregate concrete (RAC). Physical and mechanical properties of RAC were investigated including density, compressive and flexural strength. The non-destructive test methods (NDT: pulse-velocity and rebound hammer) were used to determine the concrete strength. The results obtained were compared with crushed aggregate concrete (CAC) using the normal compressive testing machine test method. Thus, the convenience of indirect tests in the case of a recycled aggregate concrete were demonstrated.

关键词： Recycled Concrete Aggregate Demolition Waste Non-Destructive Tests Mechanical Strength Admixture

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Effects of Recycled Tires Rubber Aggregates on the Characteristics of Cement Concrete

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Open Journal of Civil Engineering 2012年第4期2卷 193-197页

作者： Zeineddine Boudaoud miloud beddar Laboratory of Materials Department of Civil Engineering Faculty of Sciences and Engineering University of M’Sila M’Sila Algeria

This experimental work investigates the impact of substituting part of the conventional aggregates with rubber aggregates on certain characteristics of the cement concretes. This incorporation of rubber aggregates resulting from cutting worn tires in practical sizes decreases the mechanical resistances of the concretes while improving slightly the fluidity of the tested mixtures. The effect of these aggregates on the shrinkage of the concretes at an early age is appreciable and even very interesting for the concretes used, for example, in road construction. This technique of cutting worn tires without any further treatment makes it accessible to everyone which helps not only in saving the environment by getting rid of this cumbersome waste but also in saving traditional aggregates.

关键词： Rubber Waste Tires Concrete Mechanical Response Shrinkage

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Experimental Plans Method to Formulate a Resin Concrete

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Journal of Civil Engineering and Architecture 2012年第10期6卷 1376-1383页

作者： miloud beddar Zinedine Boudaoud Mohamed Aziz Chikouche Halima Saadia M'hammedi Faculty of Technology Civil Engineering Department M'sila University M'sila 28000 Algeria Civil Engineering Department Oum Elbouaghi University OumElbouaghi 04000 Algeria

This work is an experimental approach based on the method of experimental plans to determine a specific formulation of a resin concrete. In this study, an unsaturated polyester resin （thermosetting resin） was used with two types of mineral fillers （dune sand and crushed sand）, and with the addition of a marble powder to ensure the continuity of the particle size mixing granular. The lack of the methods for developing this kind of composite materials, had led us to perform an initial experimental approach to define the experimental field, that is to say determine the mass proportions of the various compounds of mixture of our study. In the second approach, we have established and implemented fully experimental plans with three factors namely： factor （1）： sand, factor （2）： resin, factor （3）： marble powder. Test results being the density of polymer concrete and the mechanical resistances. Finally, multi-parameters regression allowed us to determine predictive mathematical models for the different responses of the study. Tests results showed that at three days we got a tensile strength of about 16 MPa with a resin concrete density of 1.9 g/cm3. This shows the advantages of this material.

关键词： Concrete polyester resin experimental plans method mechanical resistance

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Robust switched fractional controller for performance improvement of single phase active power filter under unbalanced conditions

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Frontiers in Energy 2016年第2期10卷 203-212页

作者： H. AFGHOUL F. KRIM D. CHIKOUCHE A. beddar LASS Laboratory Electronics Department Technology faculty University Mohamed Boudiaf of M'sila BP.166 Route Ichebilia M'sila28000 Algeria LEPCI Laboratory Electronics Department University of Ferhat AbbasSetif-1 route de B6jaia Setif 19000 Algeria Department of Electrical Engineering Technology faculty SkikdaUniversity Skikda 21000 Algeria

A novel controller is proposed to regulate the DC-link voltage of a single phase active power filter （SPAPF）. The proposed switched fractional controller （SFC） consists of a conventional PI controller, a fractional order PI （FO-PI） controller and a decision maker that switches between them. Commonly, the conventional PI controller is used in regulation loops due to its advantages in steady-state but it is limited in transient state. On the other hand, the FO-PI controller overcomes these draw- backs but it causes dramatic degradation in control performances in steady-state because of the fractional calculus theory and the approximation method used to implement this kind of controller. Thus, the purpose of this paper is to switch to the PI controller in steady-state to obtain the best power quality and to switch to the FO-PI controller when external disturbances are detected to guarantee a fast transient state. To investigate the efficiency and accuracy of the SFC considering all robustness tests, an experimental setup has been established. The results of the SFC fulfill the requirements, confirm its high performances in steady and transient states and demon- strate its feasibility and effectiveness. The experiment results have satisfied the limit specified by the IEEE harmonic standard 519.

关键词： conventional PI controller fractional calculus(FC) total harmonic distortion (THD) Oustaloup contin-uous approximation (OCA) single phase active power filter(SPAPF)

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