Concrete is a man-made material that is used in construction. It is produced by combining cement, sand, gravel, water, and occasionally other ingredients. It can be cast into any shape. The mix of the cement and aggregates requires that they are first ground into a powder or fine sand. Before being mixed together with water, this mix may be shaped so that it has the desired volume before being properly mixed with the other ingredients to form concrete. Concrete is one of the most widely used materials in construction. It is used around the world by professionals and amateurs alike.
Types of Concrete
Concrete types are divided into categories based on how the mix is combined. The aggregates are crushed stone, sand, or gravel that vary in size. They are then mixed with cement and water to form concrete.
Concrete by itself is strong but it is only when the material hardens through a chemical process known as hydration that gives strength to the material that it becomes exceptionally durable. This makes concrete more valuable for road surfaces, building structures, dams, reservoirs, bridges, parking and decks among many other structures. If you have ever parked underneath an overpass during a rainstorm you may notice that there are no puddles on top of them because they are built using concrete materials.
Expect to pay a cost of around $50 to $75 per square metre for spray-on concrete, $60 to $85 per square metre for plain concrete, $75 to $90 per square metre for coloured concrete and $100 to $150 per square metre for exposed aggregate or a decorative stencilled finish. This is estimated pricing for average concreting jobs.
Concrete costs in Australia varies due to a number of factors. The cost is different when various types and quality of aggregates are used in the mix, the age and size of the job, the distance and whether it is for a large mixing plant/concrete pump or a local one-off supplier, how much you can negotiate on the cost all decides how much concrete may cost.
The benefit of spray-on concrete isn’t just the costs associated with it, it is that it is fast drying. It can be used in areas where there are no puddles and a quick turnaround time in between jobs is required. The average cost is around $50 to $75 per square metre.
Plain or Standard Concrete Prices
This type of concrete mix comes already filled with aggregate so the colour appears when the cement in the mix hardens. The aggregates are larger in size. The average cost is around $60 to $85 per square metre.
Coloured Concrete Costs
This type of mix is used for projects that require a specific colour rather than the aggregate being visible. This type of mix can also be sprayed on or trowelled or floated onto the surface depending on the look you want to achieve. The average cost is around $75 to $90 per square metre.
Exposed Aggregate or Stencilled Concrete Price
This type of mix can also be sprayed on, trowelled or floated onto the surface depending on what look you want to achieve. In this case, the aggregates are left exposed as opposed to being mixed with the cement in the concrete mix. The average cost is around $100 to $150 per square metre.
The factors that affect the cost of concrete are how large or small your project is, whether it can be completed locally or needs to be shipped in, what additional services you require like special finishes and if special materials like fly ash and slag are required for the mix.
Concreting jobs cost is typically around $35 to $50 per square metre. This cost includes labour, formwork and reinforcement as well as materials like steel reinforcing bars (rebar), cement and water.
Cost of Concrete
A concrete slab costs around $50 to $150 per square metre. A concrete path or driveway can cost around $50 to $150 per square metre depending on the installation. Concrete stairs can cost between $200 and $500 per step depending on the type of installation. To get the most accurate concrete slab cost estimates, contact a local professional. Get quotes for concrete house slabs from local professionals that offer concreting services.
The cost of a concrete slab can start from around $35 to $200 per square metre, which varies according to the types of materials used and the size. However, a plain or standard concrete slab costs around $40 to $60 whereas a coloured concrete costs about $75 to $95 per square metre. Sprayed on, trowelled or floated finishes have no effect on the cost as they are done at an extra cost depending on what look you want to achieve. The estimated cost for exposed aggregate is around $100 to $150 per square metre whereas finalising stencilled finishes may be expensive as it could require someone with artistic skills.
Concrete Cost per m2
The cost of concrete per m2 depends on the slab size in addition to the formwork. A small project with slabs up to 4 m is around $1,000 whereas a large project with high scaffolding and access equipment starts from around $3,500.
Cost of Concrete per m3
The cost of concrete per cubic metre depends on more than just the materials used. This cost is determined by the design and labour costs as well as transport fees. A project that requires a lot of location equipment, for example, a large-scale commercial project, starts from around $200 to $300 whereas smaller jobs cost around $150 to $250 per cubic metre. Concrete slab costs in Australia vary and can be as low as $240 per cubic metre and reach as high as $320 per cubic metre. The pricing range in Australia depends on a lot of factors and it’s hard to find out exactly how much does concrete cost. Concrete building costs vary and quotes for concreting jobs are easy to get.
How is Concrete Made?
Concrete has been used since ancient times, but contrary to popular belief it was not made with sand and gravel. The Romans learned how to make concrete through trial and error by mixing lime with volcanic ash found at the Bay of Naples. This method called “pozzolana”, which means “making stone” in Italian is still used today to make many different types of mixtures for numerous construction projects.
When the first modern cement kilns appeared during the Industrial Revolution, they produced a small amount of cement that was extremely expensive because all ingredients had to be transported from distant quarries. Making concrete, therefore, required large amounts of skilled labour rather than large amounts of materials, making it an expensive building material at the time. By contrast, modern cement kilns produce Portland cement which saves on transportation costs and is extremely cheap.
What does Mix Concrete Mean?
Mixing concrete can be done in different ways, but the most common method is by adding water to the constituents of concrete such as gravel, sand and cement paste. The installation process is called placing and involves shovelling the ingredients into a mixer that mixes them together inside of a rotating drum. Once all ingredients are combined, they form a thick liquid called “slurry” that is then poured out for use at the worksite.
Another method of mixing concrete is using premixed bags of dry gravel and sand along with pre-measured quantities of cement paste or powder. This method may save time on labour costs because workers do not have to measure the ingredients and then mix them in a wheelbarrow. In addition, moving materials from one place to another using wheelbarrow may create unnecessary dust which can be harmful to the lungs.
How do You Get Sand from Water?
Sand can be found on beaches or rivers but only a limited amount of sand is safely brought out of water because it causes a lot of damage including disrupting fish migration and damaging plant life. Jetty-based sand mining machines are being used widely in many places due to their ability to extract without causing any environmental harm. These devices have teeth that pulverise submerged rocks so they release trapped particles of different sizes. It can extract sand from depths of 100 feet and even works well in rocky areas.
What is So Special about Concrete?
Concrete has many advantages over other building materials such as wood, metal or plastic.
First of all, it lasts indefinitely so it does not need replacing like many other kinds of construction materials.
Second, it’s much stronger than other kinds of building material that ensure the safety of buildings against natural disasters such as earthquakes and floods.
Third, concrete is extremely versatile in its applications making it an essential construction material across the globe for public and private projects. Concrete is also extensively used in road construction because it’s more durable than asphalt made using stone or gravel.
How does Water Affect Concrete?
Water affects concrete in a number of ways such as curing and hardening the material or causing it to crack. When water is added to concrete, there are three major chemical reactions that take place.
First, the paste releases calcium hydroxide which further reacts with clay particles in sand and gravel to form calcium silicate hydrate and calcium aluminate hydrates. These materials bind all components in concrete together like glue making them stronger and less porous than before.
Second, cement particles react with water to form ettringite which can absorb up to four times its volume in water, this transforms it into a gel-like substance that further binds all other ingredients in concrete.
Finally, when exposed to heat (either from the sun or artificial source), calcium hydroxide releases water which transforms it into calcium hydroxide hemihydrate. This material helps to strengthen concrete that has already been hardened.
How Long does Concrete Last?
Concrete’s lifespan is largely determined by the quality of the materials used in making it, how much exposure it gets too harsh elements such as rain and sun, its location in the world (such as near the ocean where salt-water can corrode it) and how well construction workers maintain its surface. Concrete made with high-quality materials usually lasts over 100 years while poorer quality versions may need repair within about 60 years. Some very large structures like dams are built in stages in order to make them last longer because they may require repairs in 40 or 50 years due to erosion by wind or water.
What is the Best Way to Clean Concrete?
When it comes to cleaning concrete, harsh chemicals are rarely used because they can damage the material’s surface and may release harmful toxic fumes when exposed to high temperatures. However, there are some common methods for this process including using steam cleaners (which works great on large surfaces), pressure washers (that use water at very high pressures) or chemical-free solutions like vinegar or baking soda mixed with water.
Using these products won’t damage the surface of concrete even if they’re rubbed against it harder than normal which helps maintain its appearance without having to spend unnecessary amounts of money on repairs that would be needed due to scratching or chipping after cleaning.
How do You Repair Concrete?
Depending on the extent of damage done to concrete, it may be possible to apply a fresh layer over existing cracks or damaged areas. This involves mixing slurry with cement powder and sand together until they form a thick paste-like material that can bond with the old concrete. Once set, workers may need to smooth it out using trowels before letting it dry overnight. Another cheap way to fix concrete is by injecting polyurethane into holes or stains in order to seal them from exposure which works especially well for small surfaces like walls or patio tiles.
Conclusion – Concreting Cost Benefits
Concrete is so widely used because it’s durable, environmentally friendly and costs a little. Although it requires regular upkeep to keep its look clean and polished, the process is relatively easy for most people to do themselves or have done by contractors. The scope of projects that can be completed using concrete is also why this material has become a favourite among construction workers.