Sources Of Aggregate Concrete
The aggregates in our concrete are sourced from natural materials native to those regions. As a result, the appearance of our exposed aggregate offering and finish varies naturally from region to region, reflecting the local character of the New Zealand landscape.
The common types of aggregate
The common types of aggregate met in practice are :
- Sands and gravels found in nature
- Decorative aggregate
- Crushed stones (igneous, sedimentary, metamorphic)
- aggregates manufactured (iron blastfurnace slag, expanded clay and shales, sintered pulverised fuel ash, polystyrene beads)
Ready Aggregate Concrete
Allow CM COncrete to handle your exposed aggregate concrete requirements.
The strength, durability, and affordability of concrete are combined with the natural beauty of New Zealand's spectacular riverbeds in READY Exposed aggrecate. Because the rounded stones are easy on the feet, they are ideal for driveways, patios, paths, and pool surrounds.
The READY Exposed range of exposed aggregate concrete is made up of a variety of different mixes that each have their own natural look thanks to the use of different colored and sized pebbles.
You can also add READY Color to your exposed mix to achieve the desired effect.
Why Choose Our Exposed Aggregate Specialists?
The word “contractor” can have a negative connotation. Most people in the construction industry either don’t answer their phones or try to corner you into making a big financial decision. Our team saw what other contractors were doing and knew we could do it better.
We take pride in doing quality work for all our customers and have more than 20 years of experience in the concrete driveway industry.
Our Auckland Concrete Contractors offer a service to homeowners and businesses alike, who require the best value for money concrete driveways installed. Our services are guaranteed to be of the highest standard and are delivered as we say we will by a friendly, competent and reliable team.
Fixed Price Quote
No hidden Costs, our Prices Are Fixed: You can rest assured that when it comes to your exposed aggregate requirements in the Auckland area, you're getting the best price with fixed prices. This means that the price we quote you is going to be the price you pay us at the end of the job.
12 Hour Online Estimates
The price of your exposed aggregate is just a click away! For the quickest, most accurate driveway cost and quote available, fill out our quick enquiry form. We'll compile all the information you've provided, along with any other data we need in order to provide you with a fast and affordable estimate that meets your expectations. Call 09 886 7010 today for help from one of Auckland's leading contractors in concrete repair!
Exposed Aggregate Concrete Laying Method
Exposed aggregate concrete is a popular material for driveways, patios, and sidewalks. It is resistant to tyre marks in high traffic areas and has the warmth of natural stone. Many different combinations are possible when combined with oxides that change the color of the cement paste between the aggregate.
Basic Process for laying & finishing Exposed Aggregate Concrete:
- The exposed aggregate concrete is installed (min thickness usually 100mm, for driveways).
- The concreter screeds the concrete after the exposed aggregate has been placed on the ground, forming the area's levels and run offs.
- The surface is then flattened and all screed lines are smoothed out with a bull float.
- As the exposed aggregate mix begins to set, they will edge all necessary areas and hand or stick trowel the entire surface to smooth out any imperfections; this also helps to flatten out all aggregate below, giving it a very even and consistent appearance once washed off.
- Once the exposed aggregate has been completed and the bleed water has begun to dry, they will apply a surface retarder to keep the top layer of the concrete moist. These retarders are colored so that the concreter can see where they have been placed.
- In some applications, such as hotter days and wetter months, the exposed aggregate may be covered with polythene to protect it from the elements.
- The concreter will come back the next day to expose the area (we do not recommend same day wash off)
- The washing process is an important part of achieving a quality exposed aggregate job; the concreter must be careful to only remove enough slurry to expose the aggregate and achieve an even smooth finish.
- Over exposure occurs when too much slurry is washed away, causing the mix to look different because the majority of the slurry is removed from between the aggregates.
- On the other hand, if not enough of the slurry is washed off, this is known as under exposure, and it can also cause the mix to look different because there will be more slurry, giving the appearance that there is less aggregate, but the aggregate is still present but just deeper beneath the surface.
- Once the surface has been exposed, the concreter will acid wash it (sometimes the same day or the next day) with a mixture of hydrochloric acid and water to remove all residue, including excess slurry and other contaminants. This process can also be used to even out inconsistencies in the exposure.
- If the area is large enough, the concreter will make saw cuts and expansion cuts to reduce and control cracking. After cutting, they will wash the area.
- Once the concrete surface has dried to a satisfactory level, the concreter will apply a surface sealer (typically two coats), which not only protects the concrete but also enhances the color and appearance of the exposed aggregate.
Please keep in mind that exposed aggregate concrete, like regular concrete, is made from natural resources and laid by hand rather than machine, and that there are numerous elements and variables that can affect the final finish. We recommend hiring a reputable exposed aggregate contractor.
Cutting, acid washing & sealing
Acid washing will remove the fine cement slurry from the surface of the concrete providing a fine "sandpaper" textured finish providing more grip but will also darken the concrete color so take this into consideration when choosing your color. Sealing the surface of your new exposed aggregate concrete prevents staining and enhances the natural beauty of the aggregate by giving it a "wet look.