An ever-evolving world needs constantly developing construction ways. In the present world, concrete is one of the most widely used construction materials. This can be due not alone to the large choice of applications that it offers, however, in addition, its behavior, strength, affordability, durability, and flexibility play vital roles. Therefore, constructing-building works have faith in concrete as a secure, strong, and simple object. It is utilized in all sorts of buildings (from residential to multi-story workplace blocks) and in infrastructure comes (roads, bridges, etc). Concrete is used for the development of foundations, columns, beams, slabs, and different load-bearing components. So, then let us dig into detail:
What is Concrete?
Concrete, an artificial stone-like mass, is the composite material that is created by mixing binding material (cement or lime) along with the aggregate (sand, gravel, stone, brick chips, etc.), water, admixtures, etc in specific proportions. The strength and quality are dependent on the mixing proportions.
The formula for producing concrete from its ingredients can be presented in the following equation:
Concrete = Binding Material + Fine & Coarse Aggregate + Water + Admixture (optional)
Concrete is a very necessary and useful material for construction work. Once all the ingredients -cement, aggregate, and water unit of measurement mixed inside the required proportions, the cement and water begin a reaction with one another to bind themselves into a hardened mass. This hardens rock-like mass is the concrete.
Concrete is powerful, easy to create and could be formed into varied shapes and sizes. Besides that, it is reasonable, low cost and is instantly mixed. It is designed to allow reliable and high-quality fast-track construction. Structures designed with the concrete unit of measurement plenty of durable and should be designed to face up to earthquakes, hurricanes, typhoons, and tornadoes. This is an incredible advancement. With all the scientific advances there are in this world, there still has not been the way of preventing nature's injury.
Composition of Basic Concrete Mix
There are four basic ingredients within the concrete mix:
- Binding materials like cement or lime
- Aggregates or Inert Materials
- Fine aggregate (sand)
- Coarse aggregate (stone chips, brick chips)
- Admixture (e.g. Pozzolana)
Brief description of the concrete ingredients is given below.
Binding material is the main element of a concrete mix. Cement is the most commonly used binding material. Lime could also be used. When water is mixed with the cement, a paste is created that coats the aggregates within the mix. The paste hardens, binds the aggregates and form a stone-like substance.
Sand is the fine mixture. Gravel or crushed stone is the coarse mixture in most mixes.
Water is required to with chemicals react with the cement (hydration) and to supply workability with the concrete. The number of water within the combine in pounds compared with the number of cement is named the water/cement quantitative relation. The lower the w/c quantitative relation, the stronger the concrete. (Higher strength, less permeability)
Types of Concrete Mix
Concrete is employed for various projects starting from little homemade comes to large subject field buildings and structures. It is used for sidewalks, basements, floors, walls, and pillars at the side of several alternative uses. Many sorts of concrete are utilized in the development works.
Based on the variations in materials and purposes, concrete can be classified into three basic categories-
- Lime Concrete
- Cement Concrete
- Reinforced Cement Concretes
In general, there are four concrete sorts to settle on from counting on the work being done. Such as-
- Dry Ready Mix
- Ready Mix
- Bulk Dry Materials
- Transit Mix
There are other various types of concrete for different applications that are created by changing the proportions of the main ingredients. Such as:
- Regular Concrete
- High-strength Concrete
- Stamped Concrete
- High-Performance Concrete
- Self-consolidating Concretes
- Vacuum Concrete
- Roller-Compacted concrete
- Glass Concrete
- Asphalt Concrete
- Rapid Strength Concrete
- Polymer Concrete
- Light-Transmitting Concrete
Brief Descriptions of these four types of concrete are discussed below:
Lime concrete uses Lime as the binding material. Lime is usually mixed with surki and khoa or stones in the proportion 1:2:5 unless otherwise specified. The khoa or stones are soaked in water before mixing. Lime concrete is used mainly in foundation and terrace roofing.
Most engineering construction uses cement concrete composites as the main building material. It consists of cement, sand, brick chips or stone chips of the required size. The usual proportion is 1:2:4 or 1:3:6. After mixing the required amounts of materials, the concrete mix is cured with water for 28 days for proper strength building.
Reinforced Cement Concretes
For enhancing the tensile strength of concrete, steel reinforcements are added. Sometimes, RCC is prestressed under compression to eliminate or reduce tensile stresses. The resulting concrete is known as Prestressed Concrete.
Dry Ready Mix
This is the combination that may be found at the most home improvement and hardware stores. It comes in baggage typically starting from sixty to eighty pounds. Dry ready mix is simple to combine and this is often the combination that almost all homemade comes would require. The tools needed for the mixture are a bucket or cart, shovel or hoe, trowel and a measured quantity of water.
The distinction between dry ready mix and ready-mix concrete is that the water is already supplementary to ready combine. This concrete comes pre-mixed and is for larger homemade comes or for people who do not need to combine their own concrete. It is typically brought in an exceedingly little trailer, typically with an intermixture drum connected to stay it dampish and mixed. The ready combine is usually costlier and might be troublesome to search out. It additionally should be used quickly as an alternative it will set while not unfolding properly.
Bulk Dry Materials
It is price effective to purchase dry materials in bulk. This may let the project be custom-built to the particular wants and usage of the concrete. The drawback of shopping for in bulk is that there will be much space for the materials to be kept before getting used. The materials will over probably be delivered to the positioning.
This is the mix that almost all cast-in-place concrete comes can use. it is typically trucked in using concrete trucks that have the massive drum that keeps the concrete from setting up whereas in transit. It permits for one continuous pour so fewer seams and stronger concrete overall. For big comes, transit combine is far additional value effective than getting bulk materials or ready-mix since in each those the workforce to combine the concrete would get to be patterned into the value.
The most common type used is the regular concrete that is referred to as traditional weight concrete or traditional strength concrete. This pertains to the concrete that is promptly on the market within the retailer’s marketplace for personal and residential usage. This includes usage directions that are written within the packaging of the product. It utilizes sand and different materials to function aggregates and is consolidated in temporary vessels.
High strength concrete combine possesses compressive strength that is over six thousand pounds per area unit. This can be processed by lowering the water-cement quantitative relation to a minimum of 0.35 or lower. The low water-cement quantitative relation makes this sort of cementless feasible. so as to combat this weakness, superplasticizers are other to the present concrete combine.
Stamped concrete is a subject area concrete wherever realistic patterns almost like natural stones, granites, and tiles will be obtained by inserting the impression of skilled stamping pads. This stamping is applied on the concrete once it is in its plastic condition. totally different coloring stains and texture work can finally provide an end that's terribly almost like costlier natural stones. A high aesthetic look will be obtained from a sealed end economically. This is often utilized in the development of driveways, interior floors, and patios.
High-performance concrete refers to a freshly developed concrete combine that has properties that are a notch higher compared to regular concrete mixes. This includes increased strength, durability, and workability, simplicity of usage, compaction while not segregation, long-run mechanical properties, porosity, density, toughness, and volume stability. Air-entrained agents may be utilized in order to customize this concrete combine for severe environments.
The concrete combine once placed can compact by its own weight is considered self-consolidated concrete. No vibration should be provided for an equivalent individually. This combine has higher workability. The slumping price is going to be between 650 and 750. This concrete because of its higher workability is named as flowing concrete. The areas wherever there is thick reinforcement, self – consolidating concrete works best.
Concrete with water content quite the desired amount is poured into the formwork. The surplus water is then removed out with the assistance of an air pump while not looking forward to the concrete to endure setting. Thus, the concrete structure or the platform is going to be able to use earlier in comparison with traditional construction technique. These concretes can attain their 28 days compressive strength inside an amount of 10 days and therefore the crushing strength of this structure is 25 you bigger compared with the standard concrete sorts. To learn more about vacuum concrete read- Vacuum Concrete | Definition, Procedure and Advantages
Shotcreting refers to a method within which compressed air forces mortar or concrete through a tube and tap onto a surface at a high speed and forms structural or non-structural parts of buildings. Shotcrete is currently applied to the wet-mix method and has gained universal acceptance in several countries. In wet-mix application cement, aggregate, admixture, and water are mixed along before being wired through a hose and atmospherically designed. On the opposite hand, in dry-mix applications cement, aggregate, and admixture are mixed along, sent pneumatically through a tube so, at the tap via a water ring, water is injected equally throughout the combination because it is being designed.
This type of concrete has placed and compacted with the assistance of earthmoving instrumentality like serious rollers. This concrete is principally utilized in excavation and filling wants. These concretes have cement content in lesser quantity and stuffed for the realm necessary. once compaction, these concretes give high density and eventually cure into a powerful monolithic block.
The recycled glass may be used as aggregates in concrete. Thus, we tend to get concrete of recent times, the glass concrete. This concrete can increase the aesthetic appeal of the concrete. They can give long strength and higher thermal insulation.
Asphalt concrete may be a material, the mixture of aggregates and asphalts ordinarily accustomed surface roads, parking tons, airports, yet because of the core of mound dams. Asphalt concrete is known as asphalt, blacktop, or pavement and tarmac or bitumen, macadam or rolled asphalt in the other countries.
Rapid Strength Concrete
As the name implies these concretes can acquire strength with few hours once its manufacture. Therefore, the formwork removal is created simple and the building construction is roofed quickly. These have a widespread application within the road repairs, as they'll be reused once some hours.
In polymer concrete, the aggregates are restrained with the polymer rather than cement. The assembly of polymer concrete can facilitate within the reduction of volume of voids within the mixture. This may cut back the quantity of polymer that is necessary to bind the aggregates used. Hence, the aggregates are ranked and mixed consequently to attain minimum void. This kind of concrete has totally different classes:
- Polymer Impregnated Concrete
- Polymer cement concrete
- Partially Impregnated
The cement is replaced by lime during this concrete kind. The most application of this product is on floors, domes, likewise as vaults. These not like cement have several environmental and health advantages. These products are renewable and simply clean.
Concrete that has a density lesser than 1920kg/m3 are classified as light-weight concrete. The utilization of lightweight aggregates in a concrete style can provide us lightweight aggregates. Aggregates are the vital part that contributes to the density of the concrete. The samples of lightweight aggregates are stone, perlites, and scoria. The lightweight concrete is applied for the protection of the steel structures and is used for the development of the long-span bridge decks. These are used for the development of the building blocks.
To conclude with, concrete is the basic need for building or other constructional works. Thus, the knowledge of different types of concrete should use wisely by consumers’ in order to take advantage of its properties for their construction engagements.