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The present paper of a series deals with the experimental characterisation of flexural toughness properties of structural concrete containing different volume of hooked-end steel fibre reinforcement (75 kg/m3, 150 kg/m3). Third-point flexural tests were carried out on steel fibre reinforced concrete beams having a cross-section of 80 mm × 85 mm with the span of 765 mm, hence the shear span to depth ratio was 3. Beams were sawn out of steel fibre reinforced slab elements (see Part I) in order to take into consideration the introduced privilege fibre orientation (I and II) and the position of the beam (Ba-a, Ba-b, Ba-c) before sawing (see Part I). Flexural toughness properties were determined considering different standard specifications, namely the method of the ASTM (American Standards for Testing Materials), the process of the JSCE (Japan Society of Civil Engineering), and the final proposal of Banthia and Trottier for the post cracking strength. Consequently, behaviour of steel fibre reinforced concrete was examined in bending taking into consideration different experimental parameters such as fibre content, concrete mix proportions, fibre orientation, positions of test specimens in the formwork, while experimental constants were the size of specimens, the type of fibre used and the test set-up and test arrangement.

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-filled PVC, especially sugarcane bagasse-filled PVC, has not been widely discussed. In this study, elastic and viscoelastic properties of sugarcane bagasse-filled PVC composites were determined by means of three-point bending flexural tests and DMTA

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were carried out. The mechanical characterization was carried out by flexural tests, with an universal testing machine Instron 4465, following the procedure B of the standard ASMT D-790 at a crosshead speed of 8 mm/min. Five samples of each

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Pollack Periodica
Authors: Laith Sh. Rasheed, Laith Mohammed Ridha Mahmmod, Sara Alaa Abed Alameer, and Abdulrasool Thamer Abdulrasool

Abstract

In this research, the long-term potential cracking of normal concrete internally cured with clay brick waste as a sustainable approach was investigated. 10% and 15% volume of sand was substituted with corresponding quantity of pre-saturated clay brick waste to enhance the hydration of cement and improve properties of concrete. Four beams internally cured were compared with two control beams. The use of clay brick waste can improve the compressive and splitting tensile strength and also a significant reduction in cracks were observed. Depending on the recorded results, it is demonstrated that the exemplary percentages of clay brick waste to natural fine aggregate was found to be 15%, which developed greatest compressive and splitting tensile strength, and reduce the crack by means of flexural test.

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Abstract

The papers of the series deal with experimental characterisation of mechanical as well as structural properties of different steel fibre reinforced concretes that can be used for several structural applications. An extensive experimental programme (six years) has been developed to investigate the effect of steel fibre reinforcement on the mechanical performance and structural behaviour of concrete specimens. Specimens and test methods were selected to be able to detect realistic behaviour of the material, representing clear effect on the structural performance. Material compositions, test methods, type of test specimens will be detailed in the presented paper (Part I).

Furthermore, compressive strength (Part II), stress-strain relationship (Part II), splitting strength (Part III) and toughness (Part IV) will also be discussed. In the light of the motivation to determine the structural performances of 1D concrete structural element affected by steel fibre reinforcement, bending and shear behaviour (Part V) as well as serviceability state (Part VI) of steel fibre reinforced concrete beams will be analysed. Since normal force — prestressing force — can affectively be used to improve the structural performances of RC element flexural tests were carried out on prestressed pretensioned steel fibre reinforced concrete beams (Part VII). Moreover, focusing on the in-plane state of stresses for 2D structures, behaviour of steel fibre reinforced concrete deep beams in shear and steel fibre reinforced concrete slabs (Part VIII) in bending will be explained. Finally, based on the wide range of the experimental and analytical studies on the presented field, a new material model for the 1D uniaxial behaviour (Part IX) and its possible extension to the 3D case (Part X) will be described hereafter. All papers will put emphasis on the short literature review of the last four decades.

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tested. The splitting tensile test [ 16 ] was performed for curing age of concrete at 7 and 28 days. 2.3.4 Flexural test The test specimen was of size 100 × 100 × 500 mm. Modulus of rupture [ 17 ] of concrete was determined by testing concrete beams at

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length for each specimen on each jaw was 15 mm. Three-point bending tests were carried out using an Instron Universal Testing Machine, model 3369 to determine the flexural strength. Flexural testing was carried out in accordance with ASTM D-790, at a

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machine, according to ASTM D 638. The specimens were prepared by cutting them into dumbbell shapes using a hydraulic cutter machine. Five specimens were tested with crosshead speed of 5 mm min −1 . Flexural testing

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pelletizer. The extruded pellets were oven dried at 80 °C for 24 h and stored in sealed polyethylene bags to avoid moisture infiltration. The extruded pellets were injection molded into tensile and flexural test bars using an injection molding machine (Bau

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strength The ability of deformation of the materials was determined through the flexural test. 7 days test of GMC0% and GMC1% was conducted. But the prism failed with null reading. So, the testing was stopped for further proportions. In this only 28 days

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