Pervious concrete

About: Pervious concrete is a research topic. Over the lifetime, 2920 publications have been published within this topic receiving 27720 citations. The topic is also known as: porous concrete & permeable concrete.

Laboratory scale study of infiltration from pervious pavements

Abstract: Increased urbanization causes pervious greenfields to be converted to impervious areas increasing stormwater runoff. Most of the urban floods occur because existing drainage systems are unable to handle peak flows during rainfall events. During a storm ev

Material Testing Apparatus and Procedures for Evaluating Freeze-Thaw Resistance of Asphalt Concrete Mixtures

Abstract: This paper presents material testing procedures using an ASTM C666 (Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing) apparatus to evaluate resistance of asphalt concrete (AC) mixtures with respect to freeze-thaw (F-T) cycles. The ASTM C666 apparatus is mostly used for testing F-T resistance of pervious concrete, but it can be an ideal device to replace the currently used AASHTO T283, Standard Method of Test for Resistance of Compacted Asphalt Mixtures to Moisture-Induced Damage, as it was never intended to simulate F-T resistance for asphalt mixtures. To evaluate the effectiveness of the ASTM C666 apparatus in determination of F-T resistance of asphalt mixtures, two types of AC materials were sampled from an asphalt paving project: rubberized modified asphalt (RMA) and fiber reinforced asphalt (FRA). All specimens were prepared in the Materials Laboratory of Northern Arizona University, and their F-T resistance was tested using an ASTM C666 apparatus at six designed cycles: 0, 100, 150, 200, 250, and 300 cycles. After each desired cycle is complete, specimens were removed from the ASTM C666 apparatus and then tested for their stiffness using a bending beam rheometer (BBR). The viscoelastic reposes of asphalt mixtures tended to be less significant after 150 F-T cycles. The field evaluation of local asphalt paving associated with climatic F-T cycle data and F-T test results indicate that surface conditions and cracking progress of the asphalt pavements do have closer agreement with the increase of F-T cycles. The ASTM C666 apparatus is capable of providing F-T conditioning of the specimens. In combination of the BBR device and the corresponding procedure, the thermal properties of the mix (e.g., stiffness at 60 s or relaxation modulus function) can be measured and determined. The testing procedures and results are promising and prone to the purposes of F-T resistant simulation. The findings presented in this paper provide a positive trend for future research focusing on the evaluation of long-term F-T durability of asphalt mixtures.

Performance Evaluation of In-Service Pervious Concrete Pavements in Cold Weather

Abstract: Pervious concrete has been found to be a reliable stormwater management tool in regions without freeze/thaw cycles as long as the pervious concrete is protected from impermeability, is not subject to frequent heavy vehicle loads, and is made with a paste in which the cement sufficiently hydrates. Aside from clogging, structural failures, and dry concrete, there have been varying reports of pervious concrete material performance in regions that are classified as wet, freeze/thaw regions. While pervious concretes have been extensively evaluated in laboratory tests and their in‐service performance evaluated in a few case studies, there does not exist a body of research that has evaluated the distresses that are specific to in‐service pervious concretes in wet, freeze/thaw regions or that has investigated the causes of the distresses. One purpose of this research was to use existing, in‐service pervious concrete pavements to characterize and categorize typical pervious concrete structural and material distresses. When this characterization was completed, pervious concrete microstructure and mix designs were evaluated and their roles in pervious concrete material performance were evaluated. Simultaneously, pervious concrete maintenance, rheological properties, and structural design, topics of interest for the long‐term viability of pervious concrete in any climatic region, were evaluated. This pervious concrete pavement study examined twenty‐nine unique, in‐service pervious concrete pavements at nineteen different locations throughout the State of Minnesota, a region that is classified as a wet, freeze/thaw region. For the initial study, pavement surveys were completed for each pervious concrete pavement. Furthermore contractors, engineers, ready‐mix providers, city officials, street maintenance directors, and residents living near the pervious concrete pavements were interviewed for information ranging from history to design specifications to maintenance practices. These observations led to the characterization of typical functional, structural, and material distresses in the pervious concrete pavements.

Steel plate mesh foamed concrete light wallboard

Abstract: A steel plate mesh foamed concrete light wallboard consists of a steel plate mesh cage as a framework and foamed concrete as filling material and is characterized in that: the steel plate mesh cage is made by welding the two parallel steel plate meshes and the evenly distributed reinforcement steel bars with the length equaling to the space between the two parallel steel plate meshes and perpendicular to the steel plate meshes; the foamed concrete is light porous concrete and is froth concreted in the mould, wherein, one part of the concrete is filled in the steel plate mesh cage preset in the mould, while the other part of the concrete coats the steel plate mesh The utility model, as the nonbearing wallboard, is of great strength, light weight, durability, waterproof and impervious effects, heat and sound insulation, convenient construction, and is thinner than the wallboard built by solid clay brick and enlarges usable floor area