Exposed Aggregate Concrete Driveways are made from one of the most versatile construction material available.  Researchers and scientists from all around the world have been studying and experimenting to make concrete a better and more sustainable material.

The Durability of Concrete

Its durability and ease of construction makes concrete a first choice for designers and constructors alike in an array of projects. Construction of exposed aggregate concrete driveways is no different. Gone are the days when the driveways were only bituminous i.e. flexible which requires a very good base to transfer the loads to the soil. Concrete Driveways/ pavements are rigid which use the slab action to transfer the loads and therefore work fine even if the base has flaws.

Contrasting Exposed aggregate concrete

Creating some shade with a tree in the concreted area. The tree roots are protected with a slotted stainless steel grate. The lighter colour Hansen Galaxy forms a geometric pattern around the grate.

With time, concrete driveways have evolved to exposed aggregate concrete driveways which now are pretty standard in a number of countries due to  the benefits they provide.  Exposed aggregate concrete driveways and/ or pavements are, simply speaking, concrete pavements having aggregates exposed on the top layer. This brings a beautiful yet rugged feeling to the pavement along with the required friction that a driveway needs.

A plethora of research studies suggest that Exposed Aggregate Concrete Driveways offer better skid resistance with less traffic noise (What Is Exposed Aggregate? Exposed Aggregate Concrete Explained, n.d.; Zhang et al., 2014). Although there are multiple other reasons to choose exposed aggregate concrete driveway over the conventional ones, the two mentioned above sets this kind of driveway apart for it deals with noise pollution and provides safety more than its counterparts. Not only has it been used in driveways at private properties but in highways all around the world. Some countries like Australia and UK have even gone as far as creating highways and studying its benefits over years long research projects.

skid marks concrete pavers

A set of skid marks concrete pavers. The skid resistance of exposed aggregate concrete makes it a safer choice.

Figure 2 Skid Marks (What You Should Do When Tyre Skid Marks Appear in Your Street, n.d.)

7 reasons to choose Exposed Aggregate Concrete Driveway over a conventional concrete driveway.

  1. Skid Resistance – a safer choice.
  2. Less Vehicular Noise – environmentally sustainable.
  3. Reduced Glaring
  4. Versatile – can be produced of different colours with different aggregate textures
  5. Durable – it is as durable as conventional concrete and can last for around four decades
  6. Cost Effective – Although a little expensive than conventional concrete, it offers a cost effective package considering the benefits it brings along with it.
  7. Ease of construction – It is easier to construct as compared to other options which offer an aesthetic value to the driveway.

 

As noted above, exposed aggregate concrete offers a more aesthetic yet safer alternative to a conventional concrete driveway. It brings in the options of multiple textures and colours that one can get with the usage of different kinds of aggregates to be exposed on the top layer. Further, variation in colour can be achieved using pigmented cements to create a contrast between the construction and the driveway.

Exposed Aggregate Concrete, although first utilised in 1990s in Australia and UK ,is still a recent trend for many residences and in commercial landscaping.

 

exposed aggregate concrete

Alternating colours of exposed aggregate concrete.

 

Q: How is an exposed aggregate concrete driveway constructed.

Different exposed aggregate concrete installers will have slightly different construction techniques. Technically speaking, there are four methods to achieve an exposed aggregate concrete finish for your driveway.

  1. Brushing and Washing: The oldest yet simplest method. After some time, the surface of concrete is washed and brushed using a broom to a desirable depth where the aggregates are exposed.
  2. Using Chemicals: Chemicals – retarders to be specific – are sprayed on the top surface which slows the setting and hardening time of the upper layer which later becomes easy to remove.
  3. Seeding the decorative aggregate: This is rather easy and provides the finishing of one’s own choice. Right after placing concrete, one can seed the decorative aggregate on the top layer.
  4. Topping: This method is used when an existing conventional concrete is upgraded to an exposed aggregate concrete driveway. A small layer of exposed aggregate concrete is poured over the already existing slab.
  5. Mixing the decorative aggregate: Mixing the aggregate to be exposed in the concrete would expensive but less labour intensive task.

Q: Is exposed aggregate concrete expensive?

Yes, but not by a huge percentage. Decorative aggregates are usually required in this case which cost a little higher than conventional aggregate. So, is the case with retarding agents – if used!

Q: Is exposed aggregate concrete strong?

Exposed Aggregate Concrete is as strong as conventional concrete. It is no different than conventional concrete except for its surface. It can take vehicular loads just as good as conventional concrete even during extreme weather conditions.

Q: Should you seal exposed aggregate concrete driveway?

Yes, the exposed aggregate concrete driveway – very similar to conventional concrete driveway – requires sealing after every 4 to 5 years.

 

Related Concrete Information from Red’s Landscaping Melbourne

7 Reasons to Choose Concrete Pavement

 

Commercial Concreting

 

4 types of Eco-Friendly Concrete

 

3 Best Types of Concrete Retaining Wall

 

9 Concrete facts for Melbourne Landscapers.

 

3 Best Concrete Path Construction Techniques

 

7 Great Reasons to choose Permeable Concrete

 

 

© Red’s Landscaping Melbourne – Quality Landscapers Melbourne

 

 

References

5 Incredible Advantages of Having Exposed Aggregate Concrete in Your Home – TechSling Weblog. (n.d.). Retrieved October 16, 2021, from https://www.techsling.com/5-incredible-advantages-exposed-aggregate-concrete-home/

Exposed Aggregate Concrete – Decorative Pebble Finish – Concrete Network. (n.d.). Retrieved October 15, 2021, from https://www.concretenetwork.com/concrete/exposedaggregate/

Exposed Aggregate Concrete Driveways Melbourne & Concrete driveways Melbourne | Exposed aggregate driveway, Exposed aggregate concrete, Aggregate concrete. (n.d.). Retrieved October 16, 2021, from https://www.pinterest.com.au/pin/531776668482896555/

Nakhi, A. Ben, & Alhumoud, J. M. (2019). Effects of Recycled Aggregate on Concrete Mix and Exposure to Chloride. https://doi.org/10.1155/2019/7605098

Perth’s Best Exposed Aggregate Driveways – Decorative Concrete WA. (n.d.). Retrieved October 15, 2021, from https://www.decorativeconcretewa.com.au/exposed-aggregate/

Understanding the Meaning of Exposed Aggregate Concrete. (n.d.). Retrieved October 16, 2021, from http://www.cedarlinecontracting.ca/understanding-meaning-exposed-aggregate-concrete/

What Is Exposed Aggregate? Exposed Aggregate Concrete Explained. (n.d.). Retrieved October 15, 2021, from https://www.absolutescapes.com.au/faq/what-is-exposed-aggregate/

What You Should Do When Tyre Skid Marks Appear in Your Street. (n.d.). Retrieved October 16, 2021, from https://www.staineaters.com.au/burnout-mark-removal/

Zhang, J. P., Liu, G. Q., & Wang, P. Z. (2014). Skid-Resistance and Noise-Reducing Characteristics of Exposed-Aggregate Cement Concrete Pavement. Advanced Materials Research, 1052, 352–357. https://doi.org/10.4028/WWW.SCIENTIFIC.NET/AMR.1052.352