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Using a surface retarderToday, most contractors expose aggregate by spraying a chemical surface retarder onto the slab surface immediately after placing and finishing. This delays the set and gives them the flexibility to remove the cement paste up to a day or so later, either by scrubbing or pressure washing.
What type of concrete is used for exposed aggregate?
Matt Villers of CSI recommends recycled crushed concrete as a base for exposed aggregate walkways. “When you hose it and wack it, it’s almost like you’re walking on pavement,” says Villers. Translation: When properly applied with water and compacted, recycled concrete makes a very stable sub-base for concrete walkways.
Can you turn concrete into exposed aggregate?
It can be applied to any concrete that has been cured for a minimum of 28-days. It is a spray-on application that is 2-3mm thick on top of the existing concrete. We can then work with this to create a plain, speckled or flecked finish that looks like exposed aggregate.
Is Exposed aggregate stronger than concrete?
Exposed aggregate concrete in Hamilton, while the more expensive of the two, comes with numerous benefits of its own. While still incredibly durable, exposed aggregate is more prone to damage than standard concrete and therefore needs to be sealed more often.
How long does Exposed aggregate take to dry?
How long does exposed aggregate take to dry? Wet exposed aggregate can take about a few hours to dry. Since it is a special type of concrete, it will harden right after pouring. It can take about 24 hours to cure, but it is still susceptible to damage for the next four weeks.
Can you Pebblecrete over existing concrete?
It can be applied to any sound concrete, including old pebblecrete. Resurfacing/spray on is suitable for application on concrete driveways, pathways, patios, stairs, pool and barbeque areas, schools, car parks and commercial projects that have existing concrete.
Is Exposed aggregate hard to walk?
We have found it surprisingly comfortable on the foot compared to some others we have walked on in the past. As many have said it depends on the stones/pebbles used and how exposed it is.
Is Exposed aggregate cheaper than concrete?
Seeded exposed aggregate is a little more expensive than natural exposed aggregate, due to the cost of the seed rock and the extra labor required to ‘seed’ the concrete. Both types can be sealed or not, depending on the homeowner’s preference.
Why is exposed aggregate so expensive?
Exposed aggregate concrete costs as much as double what you’d pay for normal class concrete. This is because there is an additional material cost for the aggregate used and more labour involved in creating the finish.
Does aggregate concrete crack?
that fills it will be a lot more visible than the neutral epoxy. there is no concretor that will guarantee against cracking, as long as all efforts and correct installation practices are done, concrete can and does crack.
Can you make exposed aggregate smooth?
How do you fix bad Exposed aggregate concrete? Acid washing will help to remove the surface marks. First, mix a 1:1 solution of muriatic acid in water. Spray the solution on the surface, then scrub the acid with a stiff-bristled acid-resistant broom.
Can you pressure wash exposed aggregate?
Steps to Clean Exposed Aggregate Step 1 – Saturate the surface with a cleaner leaving it to absorb into the concrete. Step 3 – Use a hose with a nozzle or ideally a high power pressure washer to sequentially move from the high end of the concrete slab to the lower drain area.
Do you seal exposed aggregate?
Does exposed aggregate need to be sealed? Yes. These sealers—typically film-forming acrylic resins—can help protect against spalling, dusting, efflorescence, freeze-thaw damage, stains, deicing salts, and abrasion. A sealer will also enhance the color of the aggregate, accentuating its depth and richness.
How soon can you seal exposed aggregate?
Allow new concrete to cure completely (at least 28 days or as recommended). Most sealers must be applied under dry conditions. Applying to damp concrete could cause haziness or loss of adhesion. Air temperatures should be above 50°F during sealer application and for at least 24 hours after.
Can you stencil over exposed aggregate?
Allow at least 2 hours drying time, overnight drying time or longer is recommended if going over exposed aggregate, Pebblecrete, bitumen, you are experiencing cold weather or when concrete is in shady areas, before applying the Patterned Stencil or Stencil Tape lines, tape will not stick if not completely dry.
How much is Pebblecrete per sqm?
The average pebblecrete cost per square metre is $100 to $150, but it will cost slightly more if it’s laid on a sloping or steeply sloping surface. For example, if you want to have a single car pebblecrete driveway laid on a flat surface, it might cost around $2000-$2500.
Can exposed aggregate be resurfaced?
Exposed aggregate concrete is a decorative finish where the top layer of concrete is removed to reveal the small aggregates beneath the surface. This means if you have an existing concrete surface that is structurally sound, we can resurface it to look like exposed concrete.
Is Exposed aggregate worth it?
Exposed aggregate is mostly recommended for families. Because it is slip resistant, you can use it as the surface for your pool deck, patio, and sidewalk. It is also a great choice for those who plan to improve the look of their driveway because of its resilience to heavy items.
How long does Exposed aggregate concrete last?
On average they last from seven to 10 years and require little to no maintenance.
Is sealed exposed aggregate slippery?
Sealed surface may be slippery when wet. For additional slip resistance, use Glaze ‘N Seal Grip ‘N Seal additive. Product coverage will be 100 – 400 square feet per gallon for the first coat depending on surface porosity. Second coat will go up to 50% further.
