Full Paper Proc. of Int. Conf. on Advances in Civil Engineering 2012
Mechanical Properties of Pervious Concrete Sanket Sharma1,Sarita Singla2 and Taranjeet Kaur3 1
PEC University of Technology, Chandigarh, India Email: sanket414@gmail.com 2 PEC University of Technology, Chandigarh, India Email: {ssaritasingla@yahoo.com, taran_madan@yahoo.co.in} Abstract—The term pervious concrete typically describes a near-zero-slump, open-graded material consisting of portland cement, coarse aggregate, little or no fine aggregate, admixtures, and water. The combination of these ingredients will produce a hardened material with connected pores, ranging in size from 0.08 to 0.32 in. (2 to 8 mm), that allow water to pass through easily. The objective was to investigate the effects of percentage of fine aggregates and cement to coarse aggregate ratio on the important engineering properties of pervious concrete. As per the test results, maximum compressive strength of pervious concrete was achieved by using the 20mm graded aggregate and 1:4 cement: total aggregate ratio. The maximum cube compressive strength achieved at 7 days was 17.91 N/mm2 and 27.1 N/mm2 at 28 days. Maximum water permeability of order 3.39 X10 -4 cm/ sec was achieved which is about 3.4 times more permeable than high permeability concrete. Index Terms — Pervious Concrete, no fines concrete, cube compressive strength, cylinder compressive strength, split tensile strength, flexural strength and permeability.
Fig. 1. Pervious Concrete
A. Historical Background The use of no-fines concrete as a pavement material had been extremely limited and had only recently been developed for this particular application. However, no-fines concrete had been used extensively as a structural building material in Europe, Australia and the Middle East for over 70 years (Macintosh et al. 1965)[2]. The use of no-fines concrete became considerably more widespread during the material shortages after World War II, for cast-in place load bearing walls of single and multi-storey buildings. In recent years no-fines concrete had been used as a load bearing material in high rise buildings up to ten-storey. The most remarkable use of this form of concrete was undertaken in Stuttgart, Germany where a high rise building was constructed using conventional concrete for the six bottom storey and no-fines for the remaining thirteen upper storeys (Malhotra 1976)[3]. Offenberg stated that the first popular usage of pervious concrete was in post-World War II England where it was used in two-story homes known as the Wimpey Houses [4]. No-fine concrete was then used in some parts of the walls by Wimpey architects and engineers to decrease the cost. Some of the applications for pervious concrete involved residential roads, driveway, sidewalks, parking lots, low water crossings, artificial reefs, slope stabilization, noise barriers, tennis court, swimming pool decks, and zoo areas.
I. INTRODUCTION Pervious concrete was a special high porous concrete used for flatwork applications that allow water from precipitation and other sources to pass through, thereby reducing the runoff from a site and Recharging ground water levels. Its void content ranged from 18 to 35 % with compressive strengths of 400 to 4000 psi (28 to 281 kg/cm2)[1]. Typically, pervious concrete had little or no fine aggregate and had just enough cementitious paste to coat the coarse aggregate particles while preserving the interconnectivity of the voids. Taking advantage of the corresponding decreased density, the concrete was incredibly permeable while still able to provide a quality structural pavement. Instead of moisture (e.g. rain/snow melt) running off the surface horizontally, virtually all storm water falling onto pervious concrete immediately drained directly down through the pavement to the sub grade, eliminating runoff while providing filtration and ground water recharge. Pervious concrete resembled an open-cell material with an appearance sometimes described as that of a “Rice Krispies” treat. Nevertheless, the product could be integrally colored, painted, or otherwise modified to be aesthetically in tune with the project environment in the same ways as conventional concrete. It could even be made acceptably smooth for good shopping cart mobility by the means of rapidly advancing placing techniques, equipment, and concrete mix design technology while still maintaining a non -slip surface. © 2012 ACEE DOI: 02.AETACE.2012.3.18
B. Benefits and Problems of Pervious Concrete Mix One of the primary uses of pervious concrete is in storm water management. Due to its high porosity, pervious concrete 161