What are the steps followed in concrete mix design?

Concrete Mix Design Made Easy

• Step 1: Slump Flow.
• Step 2: Aggregate Size.
• Step 3: Mixing Water and Air Content.
• Step 4: Concrete Strength and Water/Cement Ratio.
• Step 5: Coarse Aggregate.
• Step 6: Fine Aggregate.
• Step 7: Adjustment for Moisture in Aggregates.
• Step 8: Summary Design.

What are the materials used in pervious concrete?

Pervious concrete consists of cement, coarse aggregate (size should be 9.5 mm to 12.5 mm) and water with little to no fine aggregates. The addition of a small amount of sand will increase the strength. The mixture has a water-to-cement ratio of 0.28 to 0.40 with a void content of 15 to 25 percent.

Is code for pervious concrete mix design?

The proportion of cement, fly ash or GGBS, water, coarse aggregate and water-cement ratio have been calculated with the help of Indian standard code (IS: 10262 : 2009). To cast the concrete cubes the mix design is very essential.

Is pervious concrete more expensive?

In general, initial costs for pervious concrete pavements are higher than those for conventional concrete or asphalt paving. But total costs can be substantially lower. The material itself is only a little more expensive, but we tend to install pervious concrete thicker than regular concrete, says Youngs.

Which material can be replaced in concrete for a strong pervious concrete pavement?

12. Which material can be replaced in concrete for a strong pervious concrete pavement? Explanation: Apart from replacement, there are many materials that can be used for substitution, for a strong pervious concrete pavement better option is to replace coarse aggregate.

How do you calculate design mix for concrete?

The mix calculations per unit volume of concrete shall be as follows:

1. Volume of concrete = 1 m3.
2. Volume of cement = (Mass of cement / Specific gravity of cement) x (1/100) = (39/3.15) x (1/1000) = 0.125 m3.
3. Volume of water = (Mass of water / Specific gravity of water) x (1/1000) = (197/1) x (1/1000) = 0.197 m3.

What’s the best mix for concrete?

In terms of the ratio for concrete, it depends on what strength you are trying to achieve, but as a general guide a standard concrete mix would be 1 part cement to 2 parts sand to 4 parts aggregates. For foundations, a mix of 1 part cement to 3 parts sand to 6 parts aggregates can be used.

What is pervious concrete used for?

Pervious concrete has applications in sustainable construction, and is often used in sidewalks, parking areas, and greenhouses. Using pervious concrete is recognized as a Best Management Practice for Stormwater by the US Environmental Protection Agency (EPA), since it provides pollution control.

What are the properties of pervious concrete?

Pervious concrete has a typical density between 1600 and 2000 kg/m3, permeability in the range of 1.3 and 12.2 mm/s, porosity between 10 and 35%, compressive strength between 3.5 and 28 MPa, and flexural strength between 1 and 3.8 MPa [15].

How do you increase the strength of pervious concrete?

Apart from Cement and Aggregate admixtures such as Nano-Silica and Polypropylene are used in this project to increase the Compressive strength and abrasion strength of pervious concrete. Nano silica is added in 5% to 15% weight of cement particles.

How does permeable concrete work?

A pervious concrete mixture contains little or no sand, creating a substantial void content. Using sufficient paste to coat and bind the aggregate particles together creates a system of highly permeable, interconnected voids that drains quickly.

What kind of Mix do you use for pervious concrete?

Pervious concrete mixes consist of cement, single sized coarse aggregate and water (water/cement ratio ranging 0.3 to 0.4). It is reported that, the 28-day compressive strength of such mixes range from 800 psi to 3,000 psi based on compressive strength testing per ASTM C39.

How is pervious concrete different from regular concrete?

Pervious concrete uses the same materials as conventional concrete, with the exceptions that the fine aggregate typically is eliminated entirely, and the size distribution (grading) of the coarse aggregate is kept narrow, allowing for relatively little particle packing.

What are the air voids in pervious concrete?

Pervious concrete contains large amounts of interconnected air voids which allow water to pass through rapidly. The typical air void content of pervious concrete is between 15–30% allowing a fl ow rate of 2–18 gal/min/ft2. Structural properties can be altered by the addition of fi ner aggregate.

What should the a / C ratio be for pervious concrete?

Figure 4 shows two different aggregate sizes used in pervious concretes to create different surface textures. Generally, A/C ratios are in the range of 4.0 to 4.5 by mass. These A/C ratios lead to aggregate contents of between about 2200 lb/yd³ and 3000 lb/yd³ (1300 kg/m³ to 1800 kg/m³).