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The Impact of Reduced Concrete Strength Due to Varying Rubber Contents on the Maximum Flexural Reinforcement in Beams

Arasteh, Hamid Reza | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58476 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. In today’s world, the industrialization of societies and the increasing demand for the construction of reinforced concrete structures, along with environmental concerns, necessitate the adoption of sustainable development approaches and the production of green concretes. In this regard, the use of rubber waste as a substitute for natural aggregates can be an effective solution for reducing the negative impacts of the concrete industry on the environment and for the optimal management of hazardous wastes such as rubber. This research, aimed at presenting a design for the production of high-strength, self-compacting rubberized concrete, addresses the compensation for the main weaknesses of rubber concretes (i.e., reduced strength and performance); in this process, fine aggregates have been replaced by high amounts of rubber (0, 20, 40, and 60 percent by volume). In the first phase, by evaluating the accuracy of seven compressive stress–strain behavioral models—including the Hognestad, Saenz, Kent–Park, Popovics, Thorenfeldt, Hajime, and Eurocode 2 models—in predicting the behavior of this type of concrete, a hybrid Popovics –Guo model was introduced and proposed, which accurately predicts the behavior of high-strength concretes incorporating rubber. In the next phase, to evaluate the structural element behavior of beams made with this type of concrete, beam modeling was carried out in the finite element software ABAQUS. For each rubber replacement percentage, three different tensile longitudinal reinforcement ratios (0.8ρmax, 0.65ρmax, and 0.45ρmax) were considered, and their flexural behavior was investigated under four-point loading. The overall findings of this study indicate that increasing the rubber content enhances ductility and leads to a softer structural response of the concrete, while simultaneously reducing the ultimate strength at both the structural element and specimen levels. Furthermore, the results suggest that the optimal rubber replacement ratio is 40%; beyond this level, the structural performance of the element decreases. The use of this type of concrete in structures, especially in applications that require high energy absorption and high ductility, can lead to an overall improvement in structural performance
  9. Keywords:
  10. Rubberized Concrete ; Self Compacting Concrete (SCC) ; Finite Element Modeling ; High Strength Concrete (HSC) ; Compressive Stress-Strain Behavior ; Reinforcement Concrete Beam ; Rubberized Reinforced Concrete Beam

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