Research Papers - Department of Civil Engineering

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Start date: 2025Subject: search.filters.subject.stormwater management

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    PublicationOpen Access
    Effectiveness of Porous Concrete Pavements in Removing Total Suspended Solids from Urban Stormwater Runoff
    (International Society for Environmental Information Sciences, 2025-05-25) Wijewickrama D.; Miguntanna N; Siriwardhana K.D; Kalaimathy S.N.; Kantamaneni K; Rathnayake U
    This study investigates the effectiveness of total suspended solids removal in porous concrete pavement (PCP) with only changing aggregate size of the mix design and the thicknesses of the pervious concrete pavement specimen. The study used two different aggregate sizes, 10 ~ 14, and 14 ~ 19 mm, with a third mix percentage consisting of 50% of both aggregate sizes. Water content was main-tained low in the mix designs since it influenced the porosity of the concrete and the water flow rate after solidifying the concrete. Slump tests were done to find the workability and all 3 mix designs’ slump was near zero, and casted cubes were used to determine t he compres-sive strength of each mix design. The results revealed that aggregate size had a direct impact on compressive strength, with smaller aggregate mix designs having higher strength. The study validated PCP’s filtration properties as well as the percentage removal of total suspended solids. The removal efficiency was found to increase with the thickness of the PCP and the use of smaller aggregate sizes. Also, data revealed that where higher porosity facilitates improved filtration and reduces Total Suspended Solids (TSS) in st orm water runoff. Furthermore, Infiltration data shows, where higher TSS Reduction Efficiency is associated with improved infiltration capacity, effectively mitigating the impact of stormwater runoff on water quality. According to the study, PCP is a better alternative for stormwater management systems and may be utilized for harvesting and cleaning purposes as non-portable water. The findings of this study might assist in determining the individual performance of each porous concrete pavement type and encourage wider use of these pavements to reduce the need for impermeable surfaces for stormwater management.
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    PublicationOpen Access
    Reviving Urban Landscapes: Harnessing Pervious Concrete Pavements with Recycled Materials for Sustainable Stormwater Management
    (Multidisciplinary Digital Publishing Institute (MDPI), 2025-10-29) Gunathilake, T.A; Siriwardhana,K.D; Miguntanna,N; Miguntanna, Nadeeka; Rathnayake, U; Muttil, N
    This study examines the effectiveness of pervious concrete pavements as a sustainable and cost-effective stormwater management technique, particularly by incorporating locally sourced recycled materials into their design. It evaluates the stormwater treatment potential of three pervious concrete pavement types incorporating recycled plastic, glass, and crushed concrete aggregates, with six design variations produced using 25% and 50% replacements of coarse aggregates from these materials. The key properties of pervious concrete, namely compressive strength, porosity, unit weight, and infiltration, and key water quality indicators, namely pH, electrical conductivity (EC), total suspended solids (TSS), colour, turbidity, chemical oxygen demand (COD), nitrate (NO3−), and orthophosphate (PO43−), were analysed. Results indicated an overall improvement in the quality of the stormwater runoff passed through all pervious concrete pavements irrespective of composition. Notable reductions in turbidity, TSS, colour, COD, PO43−, and NO3− underscored the effectiveness of pervious concrete containing waste materials in the treatment of stormwater runoff. Pervious concrete pavements with 25% recycled concrete exhibited optimal performance in reducing TSS, COD, and PO43− levels, while the 50% recycled concrete variant excelled in diminishing turbidity. However, the study found that the use of recycled materials in pervious concrete pavements affects properties like compressive strength and infiltration rate differently. While incorporating 25% and 50% recycled concrete aggregates did not significantly reduce compressive strength, the effectiveness of stormwater treatment varied based on the mix design and type of recycled material used. Thus, this study highlights the potential of utilizing recycled waste materials in pervious concrete pavements for sustainable stormwater management.