A Novel Approach to Characterize Entrained Air Content in Pervious Concrete
A Novel Approach to Characterize Entrained Air Content in Pervious Concrete
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Date
2008
Authors
Wang, Kejin
Wang, Kejin
Schaefer, Vernon R.
Wang, Kejin
Schaefer, Vernon R.
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Volume Title
Publisher
ASTM International
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Authors
Wang, Kejin
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Organizational Units
Civil, Construction and Environmental Engineering
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Civil, Construction and Environmental Engineering
Abstract
The current pervious concrete placed in cold climates generally contains air entrainment but, unlike traditional concrete, the evaluation of entrained air is not performed. This paper presents results from a study that characterized the entrained air voids in pervious concrete using a RapidAir system. The RapidAir system is an automatic device that determines the air void properties of hardened concrete according to ASTM C457, “Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete.” Two types of aggregates, i.e., crushed limestone and rounded river gravel (pea gravel), and two types of air entraining agents, i.e., natural and synthetic, were used. The air entrainment dosage rates varied from zero to double the manufacturer’s recommended dosage. Compressive strength, tensile strength, and freeze-thaw durability (ASTM C666A) of the pervious concrete were tested. The results show that use of air entrainment improves workability of pervious concrete, thus reducing the overall porosity and increasing unit weight of the pervious concrete. The strength and freeze-thaw durability also increases with the level of entrained air in pervious concrete.
Comments
This article is published as Kevern, John T., Kejin Wang, and Vernon R. Schaefer. "A novel approach to characterize entrained air content in pervious concrete." Journal of ASTM International 5, no. 2 (2008). Paper ID JAI1014341-10. DOI: 10.1520/JAI101434. Copyright 2008 ASTM International. Posted with permission.
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Keywords
pervious concrete,
freeze-thaw durability,
freeze-thaw resistance,
air entrainment,
air content testing