Replacement Of Coarse Aggregate In Concrete

Aggregate is an important part of the concrete and acts as an inert material in concrete. Coarse aggregates are uneven and granular materials such as gravel, sand, or crushed stone, and are utilized for making concrete.

As concrete demand and consumption increase rapidly demand of natural aggregate also rinsed. Similarly, the production of natural coarse aggregate is not sufficient ro satisfied this increased demand. Therefore, as a solution and to save the environment the replacement of coarse aggregate in concrete is become essential.

Various alternative materials for coarse aggregate such as wastes of plastic, glass rubber, coconut shell, construction waste, quarry dust etc. can be used as replacements of coarse aggregate in concrete

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Replacement of Coarse Aggregate In Concrete

Several experiments discovered several alternatives to the original aggregate. There are various alternative materials for can be used as replacements of coarse aggregate in concrete, as shown below.

1. Fibrous Concrete Or Papercrete

Fibrous concrete and papercrete are alternative building materials with unique characteristics. Fibrous concrete incorporates fibers like steel or synthetic materials to enhance strength and flexibility. It’s durable and widely used in construction. On the other hand, papercrete is a eco-friendly option made from paper pulp, cement, and sometimes other fibers. It’s lightweight, insulating, and environmentally conscious. Both materials offer innovative alternatives for construction, catering to different needs and priorities.

Raw Materials Utilized For Papercrete

Paper Slurry
White lime or sand
Portland cement

Manufacturing Process Of Papercrete

Put waste paper or pulp into a water-filled channel dug out into the ground.
The leave for 24 hours.
Excess water is drained.
The porportion of portland cement to paper sludge and white lime is 1:05:4.
Add the required amount of water to ensure workability.
For mixing the cement slurry, utilize a mixer. Perform this mixing process for at least 10 minutes.

Advantages Of Papercrete

Papercrete is one of the cheap alternatives to concrete.
Low-tech and reasonable equipment can be used.
Papercrete is very light.
The workability is quite neat completely, and different shapes can be given.

Disadvantages Of Papercrete

The stiffness is lower than that of conventional concrete.
According to B. Fuller(published in “Structural Properties of Unique Materials Made from Waste Paper”, 2007), the compressive strength of Papercrete 96 is 1.1MPa.The compressive strength of ordinary concrete is 15-70 MPa. Concrete limits its use.
Low moisture resist.

2. Plastic Waste

Raw Materials To Create Plastic Concrete

Discarded plastic materials
Cement
Fly ash

Manufacturing Process Of Plastic Concrete

When making plastic concrete, undergraduate students follow this production process, and the steps are as follows.
Grinds plastic into finer flakes.
Then expose them to short-term, harmless gamma radiation.
Grind these flakes into fine powder.
This plastic powder is mixed with cement and fly ash.

Advantages Of Plastic Concrete

Plastic concrete has a wide range of uses.
you can meet particular requirement by tailoring them.
It the
Lightweight compared to traditional materials.
It can prevent vibration, water and chemicals.
One of the most important advantages is that it is relatively durable and has a longer service life.
Excellent electrical and thermal insulation properties.
The cost of power generation is relatively low.

Disadvantages Of Plastic Concrete

According to Md Hashmath and MdMeraj(published in: Experimental Research on Using Plastic Waste as Cement Mortar Aggregate, 2015), the adhesiveness of plastic is low. The concrete of this base material has low flexural, tensile and compressive strengths.
Plastic concrete has a low melting point.

3. Glasscrete

The glass can be utilized as an alternate for fine aggregates in concrete. It is divided into No. 8 and No. 4 sieves. A number of studies were carried out to determine the modulus of natural sand using water-washed glass sand.

Cement, coarse aggregate, and glass concrete are components of this green concrete.

Manufacturing Process Of Glass crete

The procedure of mixing all ingredients is the same as conventional concrete. However, steps to generate desired glass aggregates include a long method.
Wash broken glass beads to remove harmful organics
Dry these glass particles in an oven.
Takeout the dried granules and cool.
To obtain glass sand, put these particles in a grinder in Los Angeles.
Store the crushed components for usage as fine aggregate.

Advantages Of Utilizing Glasscrete In Concrete

The glass workability of concrete is better than natural sand.
Improve the strength of concrete by using glass.
Enhances the efficiency of concrete.

Disadvantages Of Utilizing Glasscrete

According to Jared Robert Wright (published in: Concrete performance analysis, including recycled glass as a 100% fine alternative aggregate, 2012) one of the main problems of glass concrete is the alkaline reaction of silicon (ASR silica in glass will produce silica gel due to It reacts chemically with hydroxide ions in cement. As this gel consumes water, it creates cracks in the cement.
In addition, the cleaning process is very complicated because any organic residues in the glass concrete will reduce the strength of the concrete.

4. Expanded Polystyrene Concrete

Expanded Polystyrene Concrete Raw Material

Expanded Polystyrene beads of 1mm–3mm diameter
Cement
Sand
Water

Manufacturing Process Of The Expanded Polystyrene Concrete

Concrete mixer, add any colorant and water if required.
In the mixer add the sand as well as Portland cement.
Add the cement, sand, and water mixture completely.
Add some Styrofoam particles and stir for another minute to make the particles absorb water.
Then add the required amount of Styrofoam and mix well. If beads become hardens when consuming water, you can add water.
When the mixture comes in the consistency of low slump and pourable texture, stop mixing.
Pour this mixture into a mold, spread it on a flat surface and cover it with plastic wrap to harden the mixture.
After 24 hours, remove the whole mix from the mold and enable it to cure entirely.
The curing will take about one month. You have to keep the stone damp during this procedure. It will enable full-strength bonding to arise.

Advantages Of Expanded Polystyrene Concrete

Expanded polystyrene concrete is 88% lighter than popular stone-based concrete. Therefore, structural support requirements like steel reinforcements and foundation size requirements are smaller. Moreover, it has decent insulation properties.

Disadvantages Of Expanded Polystyrene Concrete

Polystyrene materials are sensitive materials. The strength is less than conventional concrete and can be utilized as light decorative bricks simply. You cannot use it to create concrete pavers.

5. Crushed Rubber

The vehicle tire reach the end of its usable life? In this case, you can utilize it as an alternative for coarse aggregates in concrete. The vehicle tires are ground up to 3 mm to 10 mm in size to create crumb rubber.

Replacement Of Coarse Aggregate in Concrete — Crushed Rubber

Pros And Cons Of The Crumb Rubber

The improvement of rubber to concrete withstands the failure and shattering of concrete. Yet during its mixing, the air is trapped in the mix. It outcomes in low compressive strength of the concrete mix.

6. Coconut Shell

Coconut shells can be used as coarse aggregate in concrete. It has functional resistance capability against abrasion, impact, and crushing.

When used as coarse aggregate in concrete, no special treatment of coconut shell is required. Coconut husks are easily crushed into grains and transportation of this material is very economical.

The chemical composition of coconut shells is summarized below.

Material – – 0.6
Coconut shell
Cellulose – 27
Lignin – 29
Ash

7. E-waste Partial Replacement

E-Waste, another main threat to the world with its huge volume of dumps to dispose. we have a tendency to are going out of land to lose them. Specialists try troublesome to urge rid of it.

The idea is that all electronic items have a useful life after being disposed of, which is why it is called e-waste. They are included in televisions, laptops, CDs, pen drives, etc.

Using E-waste as a partial substitute for coarse aggregate in concrete is a worthwhile solution. We cannot completely change the materials in concrete because this will influence the workability of concrete.

The e-waste is crushed into the correct particle size and can be mixed with various aggregates in the concrete without affecting the quality and durability of the concrete. E-waste partial concrete is also called E-Crete concrete.

8. Construction Waste

The onstruction waste is also very favorable as a substitute for coarse-grained aggregates in concrete. It includes generally the demolished building parts like a portion of column, beam, slab, and masonry components.

In addition, some materials will be wasted during the construction process, such as boulders, bricks, etc. These materials perform well in concrete. We are already utilizing damaged bricks as brickbat Coba on the terrace.

9. Partial Replacement Of Quarry Dust

Bricks, tiles, and various light construction materials are obtained from quarry dust. In terms of chemical composition, quarry dust is similar to granite in many respects. Therefore, the strength and durability of quarry powder are suitable for use in concrete.

Concrete has a high compressive strength. If quarry dust is used in the concrete, the compressive strength will increase similarly. We have already started utilizing quarry dust in our construction procedure, such as sand beds.

10. Plastic Waste Partial Replacement

According to E-Waste, plastic waste is similarly a considerable threat to humanity and the environment. Dumping them into the sea will excessively pollute the seawater, and plastic garbage will seriously pollute the environment.

Therefore, recycling plastic waste is a good way to deal with it in construction. When used in concrete, plastic must be clean and free of dust or contaminants.

When using plastic waste, the workability of concrete is very good. Largely the plastic aggregates were utilized in road construction work. It is combined with asphalt to form a road.

Many projects have been implemented using this method.

What Is Need of Alternative Materials for Coarse Aggregate In Concrete

In construction cement, sand, and aggregates are vital materials. At current, a structure can not be built without those materials. In concrete, the total volume represents 75% to 80% due to its strength.

Recently, the demand for concrete has been increasing due to the enormous development in construction work. Moreover, studies indicate that around 10 % of all greenhouse gas emissions are included in the concrete formation.

They must be properly cleaned before they can be used to make concrete. Their angularity and strength impact the concrete in several ways. Unnecessary to say, the choice of these aggregates is an extremely important procedure.

Sustainable aggregate became a substantial requirement for considering the raw material shortages and environmental degradation.

Lightweight natural or synthetic aggregates produce lightweight concrete. It has a low cost and excellent durability. If we use alternative materials in construction, you can speed up the construction progress at a lower cost.

Alternative Materials for Coarse Aggregates

There are a number of materials available for the alternative for coarse aggregate in concrete. In concrete, we can alternate cement with reuse materials to reduce energy consumption. The list of wastes used in concrete can include fly ash, wood ash, blast furnace slag, or fumed silica. The partial replacement of coarse aggregate in concrete can bed done with alternative materials.

A special type of sustainable concrete is called green concrete. Another useful way to reduce greenhouse gas emissions from concrete is to replace aggregates. Recently, several reusable and recyclable materials are accessible for this purpose.

The various coarse aggregate materials used in concrete can be glass, rubber, expanded clay ash or plastic materials. On the other hand, alternative materials for fine aggregates in concrete may be very diverse, from asphalt to industrial by-products.

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