OPTIMIZING RECYCLED AGGREGATE PERMEABLE CONCRETE WITH GLASS FIBER FOR SUSTAINABLE URBAN DRAINAGE SYSTEMS

Sustainable alternatives to conventional concrete are required due to urbanization, construction waste, and
ineffective water management. Although permeable concrete reduces pollutants, mitigates flooding, and
replenishes groundwater, its low mechanical strength and clogging susceptibility prevent it from being widely
used. Using the absolute volume method, this study creates nine porous concrete mixtures with different
water/cement ratios (0.30–0.40), glass fibers (0.3–0.9%), and silica fume (2–6%). Portland cement, recycled
coarse aggregate, and superplasticizers based on polycarboxylic acid made up the mixtures, which were
assessed for compressive strength (GB/T50081-2002 at 7/28 days), permeability (CJJ/T135-2009), and porosity.
While silica fume (4% dosage) improved matrix densification through pozzolanic reactivity, the water/cement
ratio (optimal: 0.30) was found to be the most significant element for strength using orthogonal array design,
ANOVA, and range analysis.Without sacrificing hydraulic performance, glass fibers (0.6%) increased toughness
and crack resistance while maintaining pore connection to lower the danger of clogging. The optimized mix
was suited for non-load-bearing applications (e.g., park pavements, walkways) because it achieved balanced
strength, permeability, and durability (22% greater than traditional mixes). Glass fibers also served as
micro-carriers for the creation of biofilms, which allowed for the filtering of pollutants and the purifying of
rainwater. In line with sponge city and low-impact development (LID) objectives, this study shows how
recycled aggregates, silica fume, and glass fibers can work in concert to create permeable concrete that offers a
high-value recycling pathway for construction waste while promoting green urban infrastructure