What are the disadvantages of pervious concrete?

Permeable concrete pdf

The cementitious materials that can be used as cementitious materials are: standard hydraulic cement, cementitious additives, supplementary materials such as fly ash, silica fume and blast furnace slag. The permeable concrete mix is more rigid and its setting time is shorter compared to conventional concrete; for this reason, if necessary, setting retarding admixtures can be used, highly recommended in hot climates to facilitate delivery and placement. To prolong the fresh condition of the mix and facilitate unloading, hydration stabilizers or long-lasting retarding admixtures can be used.

Slump: In general, it is zero; however, values in the range of 20 to 50 mm have been used. Generally, the slump test is not considered for quality control purposes, as in the case of conventional concrete, it is only considered as a reference value, mainly because the mix is too stiff and the slump value is not applicable in most cases.

Why use pervious concrete?

Permeable concrete has important hydraulic, architectural and, especially, sustainable advantages. … It has a different visual impact than other types of concrete due to its texture and availability of colors. It allows the passage of water, recreates its natural cycle and facilitates its storage and subsequent reuse.

What is pervious concrete?

Unlike conventional concrete, pervious concrete has a high void content (20-35%) which allows it to drain water to the lower layers of the pavement in a natural way, reducing the risk of water accumulation. …

How is pervious concrete prepared?

Pervious concrete is achieved through a mixture of aggregates, cement and water; where very little sand is present or in some cases it is eliminated altogether, which contributes to create voids around the coarse aggregates.

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Types of pervious concrete

Pervious concrete is an alternative to traditional concrete for creating pavements and floors, used for specific purposes. Its main characteristic is its ability to allow water to flow through it.

It is not affected by: Aliphatic hydrocarbons, Alcohols, Aromatic hydrocarbons, Vegetable oils, Chlorinated solvents, Mineral oils, MIBK (methyl isobutyl ketone), UV rays, MEK (methyl ethyl ketone), Salinity, Ethyl acetate, Alkalis, Isophorone.

With the Ecological Concrete made with Ecocreto Mr. additive, it is possible to pave surfaces for vehicular and pedestrian use, where it is required to have permeable areas allowing rainwater to infiltrate freely to the subsoil.

Another of the functions obtained by using ecological concrete made with Ecocreto Mr. additive in pavements for vehicular and pedestrian use, is to capture rainwater throughout its entire surface to channel it to storage tanks and use it for different services.

How long does hydraulic concrete last?

Concrete generally lasts about 25 years in Mexico, 30 to 40 years in the United States and up to 50 years in Europe.

Where to use pervious concrete?

Pervious concrete has little or no fines. This concrete is used primarily as pavement in low-traffic roadway applications, parking areas, walkways, and pedestrian or bicycle paths.

What is a permeable pavement?

(2014: 42) define a permeable pavement as “a mixture of cement, aggregate and water, provided with a level of porosity such that it allows water to infiltrate” to the layers below.

Porous concrete

This type of sustainable urban drainage technique can be used for drainage areas of less than 4 hectares with slopes of less than 2-5%. The distance to the water table must be greater than 1.2 meters and the infiltration capacity of the soil must be 1.2 mm/hour or greater.

These permeable pavements are used in areas with low traffic intensity, residential streets, parking areas, etc. …., and are not recommended in industrial areas, gas stations or places in which considerable quantities of heavy metals accumulate.

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How is the permeability of concrete measured?

The permeability test consists of subjecting the concrete sample that has been cured under water for 28 days to a unidirectional confining pressure of 50 meters of water column at the age of 28 days cured under water.

What is permeability?

Permeability is the ability of a material to allow a fluid to pass through it without altering its internal structure. A material is said to be permeable if it allows an appreciable amount of fluid to pass through it in a given time, and impermeable if the amount of fluid is negligible.

How is self-compacting concrete made?

It consists of filling the entire mold in a single operation without any type of consolidation, then lifting it slowly, in a short time and allowing the concrete to move. After this, three diameters are measured, which are averaged to obtain the measure of workability.

Admixture for pervious concrete

Abstract: Pervious concrete allows falling liquids to pass through it with as few complications as possible, thanks to its coarse aggregate, cementitious materials, admixtures and the lower amount of water required for its application.

One of the main advantages offered by this type of concrete is the possibility of dispensing with other structures due to special needs (e.g. retention structures, gutters, drains).

Pervious concrete is achieved through a mixture of aggregates, cement and water; where very little sand is present or in some cases it is eliminated altogether, which contributes to create empty spaces around the coarse aggregates.

It is traditionally used in parking lots, light traffic areas, pedestrian walkways, among other applications. Its great advantage is that it allows rainwater to filter through its porous structure, which reduces the runoff of contaminated water.

Especially because the use of this type of concrete contributes to LEED® certification: this product can contribute to obtaining the following credits: sustainable sites (rainwater management, reduction of the heat island effect).

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