IABSE-JSCE Joint Conference on Advances in Bridge Engineering-IV, August 26-27, 2020, Dhaka, Bangladesh ISBN: 978-984-34-8313-3 Amin, Okui, Bhuiyan, Rahman (eds.) www.iabse-bd.org 379 ABSTRACT: Traffic accidents are a common phenomenon in highways and bridges. These accidents not costs only human lives, but also result in significant economic loss. Improving the impact resistance and cu- shioning capacity of road-side barriers in the event of a traffic accident can play a significant role in minimiz- ing these losses. The application of crumb rubber derived from scrap tires along with polypropylene fiber can increase the energy absorption capacity and impact resistance of concrete. Furthermore, the use of recycled coarse aggregate as a partial replacement of natural coarse aggregate can reduce the amount of material di- rected to landfills as well as produce eco-friendly sustainable green concrete. The research present in this pa- per evaluates the performance of rubberized fiber-reinforced recycled aggregate concrete in terms of com- pressive strength, splitting tensile strength, quasi-static flexural strength, and impact resistance. A mix of 30% recycled coarse aggregate and 5% crumb rubber is used as a partial replacement of natural coarse and fine ag- gregate, along with 0.5%, 1%, and 2% polypropylene fiber. The results indicate that rubberized fiber- reinforced recycled aggregate concrete has enhanced mechanical properties compared to the control concrete. The outcomes of this pilot study will pave the way for utilizing recycled coarse aggregate and crumb rubber in concrete road/bridge barriers to increase the energy absorption capacity and reduce the potential damage in the event of a traffic accident. 1 INTRODUCTION Traffic accidents are a prevalent but often neglected public safety issue, and the cause of 1.35 million fatalitie- sand 50 million injuries worldwide every year (WHO 2020). It is also predicted that these figures will in- crease significantly within the next 20 years. It is thus crucial to identify ways to minimize these traffic acci- dents and prevent the loss of life and resources. The use of concrete road barriers has become increasing pop- ular in highways and bridges, as it can play a significant role in reducing these accidents. However, these barriers are required to resist enormous and instantaneous impact loads. In this respect, they are designed to resist vehicle impacts and prevent them from overturning by dissipating their impact energy (Fadaee & Sen- nah 2017), such that efforts to augment the impact resistance and energy absorption capacity of road-side bar- riers will improve their effectiveness. Fattuhi & Clark (1996) suggested the use of rubberized concrete in roadside barriers as a means of augmenting the impact resistance. This rubberized concrete has been particu- larly useful in applications where high strength is not a significant concern, i.e. pipe heads and bedding, artifi- cial reef, trench filling, and pavement (Mutsuddy 2017). It also offers excellent vibration damping for applica- tions such as foundation pads for heavy machinery and railway stations. The use of rubberized concrete in these types of structures allows them to absorb more energy from the impact loads, and thus saves lives and resources (Mut-suddy2017).Furthermore, considering transportation and fuel costs, it is advantageous to use light-weight concrete in these types of non-structural components. Researchers have found that the use of lightweight concrete in road barriers can improve their durability properties compared to conventional con- crete in terms of freeze-thaw durability properties, alkali-silica reaction, and sulphate attack (Burke & Drake 2002, Holm & Ries 2006). A test program carried out at the University of Sherbrook used glass fiber- reinforced polymer (GFRP) bars in bridge barriers as a novel, low-maintenance design, as these bars are more corrosion-resistant than conventional steel(El-Salakawy et al. 2001). They performed a pendulum impact test (see Figure 1a) and concluded that the behavior of GFRP-reinforced bridge barriers is very similar to conven- Mechanical characterization of rubberized fiber reinforced recycled aggregate concrete for bridge barriers M. Shahjalal Military Institute of Science and Technology, Dhaka 1216, Bangladesh K. Islam Ecole Polytechnique de Montreal, Montreal, QC, Canada K.S. Ahmed Military Institute of Science and Technology, Dhaka 1216, Bangladesh K. Tamanna & M.S. Alam The University of British Columbia, BC, Canada
Mechanical characterization of rubberized fiber reinforced recycled aggregate concrete for bridge barriers
Jun 16, 2023
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