All About Concrete: Different Types of Concrete, How They’re Made & How They’re Used
While Renew Demolition specializes in the removal of concrete, it’s important to understand what concrete is, how it’s used, and why not all concrete is the same.
We’ve all seen concrete before. Those of us in the city are surrounded by it everyday. But what is concrete exactly? Concrete is a mixture of water, cement, and aggregates (i.e. crushed stones, that hardens as it dries out. While the term “cement” is often used synonymously with concrete, it is actually a chemical that is used to bind the other ingredients together.
Concrete’s many uses make it fundamental to building the structures and systems that we see in our day-to-day life, from roads and sidewalks to skyscrapers and football stadiums.
Concrete can be mixed either by hand or in a machine/mixer. The specifics of the way that a batch of concrete is mixed, including the ingredients’ respective proportions, determines the qualities that it will have, which will in turn determine its applications.
Ordinary Concrete
Ordinary concrete follows a simple 1:2:4 ratio – one part cement, two parts sand, and four parts aggregate (i.e. crushed stones). The cement binds everything together, while the sand provides strength and durability once it hardens. This is a common, general purpose mixture used in walls, beams, columns, foundations, etc.
Reinforced Concrete
Reinforced concrete is a composite material where concrete, known for its compressive strength, is reinforced with materials that provide tensile strength, typically steel bars or mesh. This combination results in a versatile and durable building material widely used in construction projects worldwide.
Reinforced concrete structures range from residential buildings and commercial skyscrapers to bridges, dams, and even nuclear power plants. Its ability to resist a variety of structural stresses, including bending and tension, makes it ideal for constructing foundations, columns, beams, and slabs. Beyond its structural integrity, reinforced concrete offers benefits such as fire resistance, longevity, and minimal maintenance requirements, making it a cornerstone in modern construction for both aesthetic and functional purposes.
However, steel is prone to rust, which shortens the lifespan of the structures and increases the need for maintenance and repair.
Polymer Concrete
Polymer concrete differs from other types of concrete in that its aggregates are held together by polymer instead of cement. This concrete variant is composed of limestone gravels, silica, quartz, granite pebbles, and other high-compressive strength materials. It is crucial that these components are thoroughly dry, clean, and free from dust to ensure optimal binding during the concrete's formation.
The polymer resin acts as the binding agent, while the aggregate provides the material's compressive strength. Polymer concrete blends exhibit a unique set of characteristics, including:
Quick curing at room temperature
Excellent surface adhesion
Long-term durability
High flexural, tensile, and compressive strengths
Low water and chemical permeability
Lightweight composition
Strong resistance to chemicals
Polymer concrete is categorized into several types, such as:
Polymer impregnated concrete
Polymer cement concrete
Partially impregnated formulas
High Performance Concrete (HPC)
High-performance concrete (HPC) encompasses more than just high-strength concrete, as not all HPC necessarily achieves high strength. HPC adheres to specific performance criteria which include:
Ease of placement
Heat of hydration control
Environmental sustainability
Longevity and durability
Consistency in mechanical properties over its lifespan
Early-age strength development
Resilience
Permeability and density considerations
Ready Mix Concrete
Ready-mix concrete, also known as RMC, is manufactured in batching plants according to precise formulations and delivered to construction sites in a ready-to-use state. The production process begins with carefully proportioning aggregates like sand, gravel, and crushed stone, along with cement and water. These ingredients are mixed thoroughly in large rotating drums to ensure uniformity and consistency.
Depending on the specific application, supplementary materials such as admixtures may be added to enhance properties like workability, setting time, or durability. Once mixed, the ready-mix concrete is transported to construction sites using specialized trucks equipped with rotating drums that keep the mixture in a fluid state until it is poured into forms or molds.
Ready-mix concrete is favored for its convenience and efficiency in construction projects, offering significant time savings compared to on-site mixing. It is widely used in a variety of applications including residential foundations, commercial buildings, roads, bridges, and infrastructure projects.
The controlled production environment of RMC plants ensures high-quality concrete with consistent performance, meeting stringent industry standards for strength, durability, and workability. This reliability makes ready-mix concrete a preferred choice for contractors and developers looking to streamline construction processes while maintaining excellent structural integrity and performance.
Asphalt
Asphalt, a ubiquitous material in modern infrastructure, is primarily composed of bitumen—a sticky, black, and highly viscous liquid derived from crude oil refining. To produce asphalt, aggregates such as sand, gravel, and crushed stone are heated and combined with bitumen in precise proportions. This mixture forms what is known as asphalt concrete, where the aggregates provide strength and durability while the bitumen serves as the binder that holds everything together.
The manufacturing process involves carefully controlling temperatures to ensure proper mixing and application consistency. Once produced, asphalt can be used in a variety of applications across construction and road maintenance industries.
Asphalt finds widespread use in paving roads, highways, and airport runways due to its excellent waterproofing properties and ability to withstand heavy traffic loads. It is also utilized in parking lots, driveways, and recreational surfaces like tennis courts and playgrounds.
Beyond its paving applications, asphalt serves as a crucial component in roofing materials known as asphalt shingles, which are favoured for their durability and weather resistance. The versatility of asphalt extends further into waterproofing membranes, sealants, and even in the manufacturing of soundproofing materials due to its acoustic properties. Overall, asphalt remains integral to modern infrastructure, providing essential durability and reliability in diverse construction and maintenance projects worldwide.
High Density Concrete
High-density concrete is a specialized type of concrete that incorporates heavy aggregates such as iron ore, magnetite, or barite to achieve densities ranging from 3000 to 6000 kg/m³. This density far exceeds that of conventional concrete, providing exceptional shielding properties against radiation and high energy impacts. For this reason, high-density concrete finds critical applications in nuclear power plants for constructing radiation shielding walls, floors, and containers to contain radioactive materials safely.
It is also utilized in offshore structures, where its weight helps anchor platforms securely against marine forces. Additionally, in the construction of counterweights, bridges, and certain types of building foundations, high-density concrete ensures stability and durability under extreme conditions, making it an essential material in demanding engineering projects requiring enhanced strength and protective capabilities.
Self Leveling Concrete
Self-leveling concrete is a specialized formulation designed to spread and settle into a level surface without needing troweling. This type of concrete is typically applied in thin layers ranging from a few millimeters to several centimeters thick. It contains high-flowing ingredients and additives that help it achieve a smooth and even finish once poured.
Self-leveling concrete is commonly used to level and smooth uneven or rough surfaces, such as subfloors before installing floor coverings like tiles, carpets, or hardwood. It can also be employed in decorative flooring applications where a flawless, flat surface is desired. The self-leveling properties of this concrete reduce labor-intensive leveling processes, offering a time-efficient solution for achieving high-quality floor finishes in both residential and commercial construction projects.
