Effect of mix proportion on the structural and functional properties of pervious concrete paving mixtures. (20th September 2020)

• Record Type: Journal Article
• Authors: Kant Sahdeo, Surya; Ransinchung R.N., G.D.; Rahul, K.L.; Debbarma, Solomon
• Is Part Of: Construction & building materials. Volume 255(2020)
• Publication Date: 2020-09-20
• Subjects: Pervious concrete pavement -- Strength -- Durability -- Permeability; PCP Pervious Concrete Pavements -- UHI Urban Heat Island -- w/c Water-to-cement ratio -- c/a Cement-to-aggregate ratio -- G1 Mix containing well graded aggregate with 19mm passing and 12.5mm retaining -- G2 Mix containing well graded aggregate with 12.5mm passing and 1.18mm retaining -- G3 Mix containing 30% of single size 10mm and 70% of single size 4.75mm aggregate -- G4 Mix containing single size 10mm and 5% fine sand -- G5 Mix containing single size 10mm and 10% fine sand -- PCCP Portland cement concrete pavements -- PVC Poly-vinyl chloride -- XRF X-Ray Fluorescence -- ITZ Interfacial Transition Zone; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.119260
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Binary blended aggregates proves to have better intermolecular bonding than single size aggregates. Incorporation of fines resulted in choking of pores of pervious concrete mixtures. Water-to cement ratios variation plays important role in porosity and permeability of the pervious concrete mixtures. Aggregate size and shape have greater influence on strength and resistance to aggressive environment. Abstract: In recent years, pervious concrete pavement (PCP) is emerging as a novel pavement technology that is gaining a lot of attention amongst academicians due to its storm water runoff capabilities and mitigating urban heat island. This pavement technology consists of special types of concrete which has little amount of fines or no fines and interconnected voids. The different types of aggregate gradation, water-to-cement (w/c) and cement-to-aggregate, and compaction techniques with variations in efforts plays an important role in providing an optimum balance in the mixture designing of PCP mixtures. Therefore, the present study is an attempt to explore the possibility of variation of different aggregate gradation types with different proportion of w/c ratios for the production of PCP mixtures. Also, to study the effect of these mix properties on structural, functional as well as durable properties of PCP mixtures. Five aggregate gradation types and variability in w/c ratios were adopted in the present study viz. G1, G2, G3, G4 and G5, respectively. G1 and G2 consisted of larger-sized and well graded aggregates, while, G4 and G5 consisted of natural fines in proportion of 5% and 10%. Meanwhile, G3 consisted of binary blended single-sized aggregates: 30% of 10 mm and 70% of 4.75 mm. The above considered gradations were studied for porosity, density, permeability, compressive strength, flexural strength, and resistance to sulphate attack, at varied w/c ratios 0.30, 0.35, and 0.38, respectively. From an extensive laboratory investigation, it was observed that the G3 mix showed the best-balanced relation between all the afore-stated parameters, required for PCP mixtures. Hence, it can be recommended that the utilization of binary blended single-sized aggregates at a w/c ratio of 0.35 would provide an optimal solution keeping in mind the desired parameters of pervious concrete pavement mixtures are met.