Holderchem
Category:Solutions

High Permeability Pervious Concrete Range

October 4th, 2020
3 min read

Pervious concrete is a high porosity concrete composed of Portland cement, coarse aggregates, water, and admixtures. The combination of these ingredients will produce a hardened material with interconnecting voids of 2 to 8 mm size. This type of concrete allows for the precipitation of water and other sources as well as for air to pass directly through the sub-base, thereby reducing the runoff from a site and allowing for groundwater recharge.

Pervious concrete is a green building alternative suitable for better storm water and land utilization management. It reduces soil erosion and allows for the filtering of deleterious materials. The drainage rate will normally hover around 700 L/min/m². Local vegetation is allowed to thrive with reduced drainage requirements. Typical applications include parking surfaces, areas with light traffic, residential streets, courtyards, drainage areas, pedestrian sidewalk embankments, tennis courts, swimming pool decks, patios, greenhouses and zoo areas.

The high porosity of pervious concrete is attained from the highly interconnected void structure. Typically pervious concrete has little or no fine aggregates and has just enough cementitious paste to coat the coarse aggregate particles so as to preserve void interconnectivity. The limestone aggregates used must be properly graded to achieve an air content structure in the 20% to 35% range. Water cement ratios in the range of 0.25 to 0.35 are normally used to foster the structure.

To achieve such low water cement ratios, Holderchem provides contractors with efficient high-range and mid-range polycarboxylate based admixtures, which can be adapted to meet climate requirements. SBR latex may also be used to enhance mix design performances.

The low water cement ratio and high void structure tend to speed the hydration process hence making placement difficult. Hydration-controlling admixtures can be incorporated in the mix design to slow down the hydration process as well as rheology modifying admixtures to make the concrete more manageable by their fattening and lubricating effects.

Typical low slump concrete challenges stem from the need to add water on site to discharge the material from the truck, the stiffening and loss of workability from fast cement hydration and the difficulty in placing the concrete. The Holderchem solution to resolve these challenges allows for the easy discharge of trucks by increasing the mix flowability without having to add water and thus without any adverse effect on compressive strength.

Pervious concrete should meet the requirements of ASTM C 1688, which defines the requirements pertaining to density and void content of pervious concrete, and ACI 522 R06. Holderchem provides customers with assistance in the optimization of their mix designs, upon request.

Related Products:

Batimix HWR 1500
BATIMIX HWR 1500 is a high-performance liquid high-range water-reducing (superplasticizer) admixture for concrete. It is based on synthetic polycarboxylate acid derivatives and on carefully selected chemicals.
Batimix Pervious Concrete 501
BATIMIX Pervious Concrete 501 is a ready-to-use special type of concrete. It exhibits high porosity for flatwork applications, which results from the highly interconnected void content. This porosity allows water and other sources to pass and precipitate through it. It is made from Type I Portland cement and carefully-graded coarse aggregates and selected additives such as plasticizing and water-retaining agents.
Batimix Retarder 210
BATIMIX Retarder 210 is a synthetically produced set-retarding admixture for concrete based on selected gluconate organic polymers. It does not contain any corroding ingredient that could potentially attack steel, aluminum, or zinc embedments.
Batimix Retarder 220
BATIMIX Retarder 220 is a synthetically produced liquid set-retarding admixture for concrete based on modified gluconate organics blended with selected plasticizing polymers. It does not contain any potentially corroding ingredient that could attack steel, aluminum, or zinc embedments.
Batimix VMA 510
BATIMIX VMA 510 is a ready-to-use liquid admixture designed to modify the viscosity of fresh concrete. When used in conjunction with superplasticizer agents, highly flowable and self-consolidating concrete mixes can be successfully produced without bleeding or segregation.

Statement of Responsibility: The information and application advice contained in this document are based on the present state of scientific and practical knowledge of Holderchem SAL. It is provided with no warranty, implied or otherwise, as to its completeness or accuracy. Since methods and conditions of application and use are beyond the control of Holderchem, HOLDERCHEM MAKES NO WARRANTIES, IMPLIED OR OTHERWISE, AS TO THE MERCHANTABILITY OR FITNESS FOR ORDINARY OR PARTICULAR PURPOSES OF ITS PRODUCTS AND EXCLUDES THE SAME. Holderchem warrants that its products shall be of sound materials and workmanship. As products are applied, handled and stored in manners and site conditions over which Holderchem has no control, Holderchem’s liability in respect of any material which can be proven defective shall be limited to the replacement of such defective material or reimbursement of its cost at Holderchem’s option. Holderchem shall not be liable for any consequential or incidental damage or loss arising out of the use of its products.

Important Note: Holderchem shall have the right to modify product specification sheets at any time without previous notice. Buyers should always refer to the most recent data sheets, copies of which can be supplied upon request. The sale of products mentioned in this literature shall be subject to Holderchem’s General Conditions of Sale Delivery and Payment[Visit: https://holderchem.net/gcsdp]

Holderchem R&D
Holderchem R&D seeks to develop solutions to meet construction challenges by bringing to market innovative products and systems, which offer benefits across the complete life cycle of buildings and other constructions. The aim is to supply customers with high-performance products to help them achieve better productivity, lower overall costs, and achieve extended service life and functionality. Research also aims at developing the Holderchem range of Batimix products with a particular focus on polymer emulsions, polymer-inorganic interactions, and product applications.
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