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Efficiency and Economic Analysis of No-Fines Concrete as Construction Material in Parking Lots
Use of No-fines concrete as a building material is comparatively a new innovation. To determine the aptness of this type of concrete for constructing the pavement of a parking lot is the aim of this study. The thickness of the pavement made of no-fines concrete was decided on the basis of the engineering properties of the special concrete mixtures prepared in the laboratory, and various traffic conditions and sub-grade characteristics. The constant cement-aggregate ratio of 1: 5 was maintained for the development of the pervious concrete mixtures. The gradation of coarse aggregates used for this study comprised of 20-16 mm, 16-13.2 mm and 13.2-9.5 mm and water-cement ratio was changed from 0.45 to 0.35. The compressive strength of the no-fines concrete mixtures after 28 days of curing was found to be in the range of 9-20 M Pa. The compressive strength of 18.22 M Pa was maximum and as such was used to design the safe thickness of the pavement of no-fines parking lot. The required thickness of the pavement was 400 mm. Further, the cost of the no-fines parking lot was estimated as Rs. 1,34,107 per 100 m2 and was compared with the cost of the parking lot made of interlocking concrete blocks which was computed as Rs. 86,192 per 100 m2. The difference was due to expensive materials and increased pavement thickness used to design the no-fines parking lot. However, in long term, the former is considered to be more cost effective due to its increased porosity and other numerous advantages.
Keywords
No-Fines Concrete, Compressive Strength, Trial Mix Design, Pavement Thickness Determination, Cost Analysis.
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