Browsing by Author "Marin-Uribe, Carlos Rodolfo"

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    Empirical relationships between compressive and flexural strength of concrete containing recycled asphalt material for pavement applications using different specimen configurations
    (2021) Marin-Uribe, Carlos Rodolfo
    The flexural strength of pavement concrete is generally deduced by testing beams or by applying empirical equations. In this investigation, concrete mixtures were manufactured, incorporating 0, 20, 50 and 100% Reclaimed Asphalt Pavement (RAP), by weight, as a replacement for natural aggregates. The compressive strength was measured using cubic specimens and the flexural strength was measured for three types of specimens; beam, semicircular (SCB) and modified beam. This study proposes logarithmic and power equations that allow the estimation of the flexural strength of a concrete mix that incorporates RAP as a function of its compressive strength. Linear or power models are proposed to predict beam flexural strength from SCB specimens and a logarithmic model for modified beam specimens. Statistical analyses show that the proposed prediction models can be considered sufficiently accurate and their use is justified.
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    Experimental study of the tensile strength of hot asphalt mixtures measured with indirect tensile and semi-circular bending tests
    (2022) Marin-Uribe, Carlos Rodolfo; Restrepo-Tamayo, Luz Marcela
    This paper examines the tensile strength performance of hot mix asphalt without and with reclaimed asphalt pavement (RAP), different gradations, asphalt content, and test temperatures applying the Indirect Tensile Test (IDT) and the Semi-Circular Bending Test (SCB). Laboratory test results indicated the dependence of the tensile strength on the study variables, with evident trends for the type of test and the test temperature. A reasonable correlation between IDT and SCB tensile strength was verified. There is also a good correlation between IDT and SCB when data reported in previous research is incorporated.
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    Flexural performance assessment of the effect of the splice length of the Jupiter ray type made of radiata pine using computer-aided design and computer-assisted manufacturing
    (2024) Veliz-Fadic, Felipe Ignacio; Rodriguez-Grau, Gonzalo; Marin-Uribe, Carlos Rodolfo; Garcia-Giraldo, John Mario; Gonzalez-Palacio, Liliana; Araya-Letelier, Gerardo
    The length of timber beams of restricted commercial lengths can be increased by carpenter splices, which requires a thorough characterization of the flexural performance of these beams. An experimental study was carried out addressing timber beams joined with Jupiter ray splices to identify the influence of height-to-length (h:l) ratios of the splices on the mechanical performance in terms of deflection and flexural capacity. Jupiter ray splices with height-to-length (h:l) ratios of 1:2, 1:3, 1:4, and 1:5 were manufactured using computer-aided design (CAD) and computer-assisted manufacturing (CAM). The flexural performance of the tested beams was characterized in terms of modulus of rupture (MOR), modulus of elasticity (MOE), inelastic stiffness (K-inelastic), mid-span deflection (delta), and shear modulus values, measured using a four-point bending test setup under pure bending. Results indicate that implementing these joints reduces the flexural performance compared to equivalent solid timber beams without carpenter splices. The ratio concerning solid beams varies in ranges of 12-24 %, 26-43 %, 57-71 %, and 21-35 % of the corresponding solid beams average MOR, MOE, delta, and K-inelastic values, respectively. Moreover, a high linear correlation was observed between the average values obtained at the bending tests with h:l ratios in this study. Finally, the predominant failure patterns are described, identifying the critical points of stress concentration.
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    Flexural strength characterisation of oblique radiata pine splice joints
    (2021) Marin-Uribe, Carlos Rodolfo
    Sawn timber is marketed in limited length, so larger construction sizes require structural joining solutions for discrete elements. Traditional carpentry joints allow wood elements to be joined in a sustainable way, as they may not require adhesives or metal implements, such as nails or plates. In this research, the mechanical behaviour during the bending of four different oblique splices, made of radiata pine, has been studied. The results obtained show that the vertical oblique rabbetted splice (ROVS) had the best bending performance, with a strength of 43% compared to the solid control specimen (C), followed by the metal splice (MC) with a strength of 34%. The other splices studied, Rabbeted Oblique Scarf Splice (ROSS), Mortised Rabbeted Oblique Splice (MROS), and Oblique Splice Diamont (OSDP) showed flexural strengths of less than 25%, compared to the control specimen (C). The failure observed in the tested joints corresponds to a characteristic flexural and shear failure, where the predominant cracks retained the same direction generated by the discontinuity of the joints and were located in the central zone of the specimen, where the flexural and shear stresses are at a maximum.