Aggregates have been used as the foundation for various structures for thousands of years.
Historically, the refinement of the production and use of aggregates is said to have occurred during the Roman Empire. During this time, aggregates played a crucial role in the building of a vast number of roads and other structures, and they’ve continued to be indispensable ever since.
Over the years, road aggregates have become an essential component when it comes to the construction and maintenance of road infrastructure.
Similarly, as global infrastructure expands and we see more extreme weather conditions the demand for resilient and long-lasting roads increases, choosing the right road aggregate for your project has become extremely important.
In this guide, we will explore what road aggregates are, their different types and the desirable properties you need to look out for.
Let’s begin!
What is Road Aggregate?
Road aggregate is a category of aggregate material that plays a vital role in the construction and maintenance of road infrastructure. They serve as the foundation support necessary to create a durable and stable road structure. They can also be used as a top decorative layer or for road repairs.
Road aggregates can be made of various materials such as MOT Type 1 granite, gravel, sand, crushed stone and even recycled concrete. Typically, you choose your road aggregate material based on what properties you desire and require for your roads.
Road aggregates are responsible for improving the structural integrity of a road and making it less susceptible to cracks and potholes. Additionally, they also play a crucial role when it comes to drainage. By facilitating smooth water flow, road aggregates minimise the chances of surface erosion and water damage.
When constructing any road, you need to choose quality road aggregates to build a hard-wearing road that can withstand harsh weather conditions and stand the test of time.
Types of Road Aggregates
1) Crushed Stone
Crushed stone such as MOT Type 1 granite is a very commonly used road aggregate that can help you create strong surfaces. With its sharp edges and angular particles, its shape offers excellent stability and load-bearing capacity, making it an ideal choice for the base layers of roads.
2) Gravel
Gravel is another popular aggregate that is naturally occurring and often used in the sub-base layers of roads. Its rounded particles allow for effective drainage and prevent water accumulation.
3) Sand
Sand is a fine type of road aggregate that is used for filling voids and creating smooth surfaces. Typically, it is mixed with other aggregates to enhance its compaction and stability. Additionally, sand is also utilised in the production of concrete and asphalt and increases the durability and longevity of the road surface.
4) Natural Stone Aggregates
Natural aggregates are aggregates that are found in nature. Some common examples include natural gravel, granite, basalt and limestone. Each natural stone aggregate offers its own unique set of properties that make it a fitting choice for road infrastructure.
5) Synthetic Aggregates
Synthetic road aggregates refer to materials that are manufactured. These types of aggregates are used when traditional aggregates do not possess certain performance characteristics.
Desirable Properties of Road Aggregate
1) Strength
Aggregates used in road construction need to be strong so that they can withstand the stress caused by heavy vehicle traffic.
Road aggregates are often impacted due to moving wheel loads. This impact increases depending on the speed of the vehicle and the roughness of the road. As such, strength is a crucial property to remember when choosing your road aggregates.
2) Hardness
The surfaces of roads are subjected to constant abrasions or rubbing due to moving traffic. Additionally, abrasive action may be more severe depending on vehicle tyres and the top layer of surface aggregates. Your road aggregates need to be hard enough to withstand constant friction and effectively prevent wear and tear.
3) Durability
Aggregates used in road construction are often subjected to external environmental factors, like rain or groundwater, alongside the impurities within them. As such, your road aggregates need to be durable enough to weather harsh conditions and minimise erosion.
4) Shape of aggregates
The shape of road aggregates is an important property that is easy to overlook. Since there are multiple options to choose from, you need to carefully analyse all the requirements for your road and make your choice accordingly.
Contact Middleton Aggregates For Exception Road Aggregate!
Your choice in aggregate plays a crucial role in the structural stability and longevity of any road infrastructure. As such, you need to carefully evaluate all the different types of road aggregates available, alongside the properties you desire, to choose the right fit for your project.
If you are looking for a reliable supplier of road aggregates for your next project, we can assist you.
Middleton Aggregates is a leading producer and supplier of high-quality aggregates, fill materials and plant hire services that cater to your construction needs.
Based at Blackborough End, King’s Lynn, with multiple outlets located across Norfolk, we serve communities located across the Norfolk, Suffolk, Cambridgeshire and Lincolnshire area. Whether you wish to build a large commercial project or a small residential structure, we provide you with high-quality products and reliable service.
With over 40 years of experience in the industry, our team of experts are there to offer you specialised support and guidance throughout every step of your purchase.
For more information on our products and services, visit our website or contact us for more information or to schedule a delivery!
