- When should you float concrete?
- Can you finish concrete without a bull float?
- What’s the difference between a trowel and a float?
- How long should concrete cure before putting weight on it?
- Can you smooth concrete after it dries?
- What happens if you dont float concrete?
- Is a bull float necessary?
- What defects can be caused by bull floating too soon?
- How thick does concrete need to be to not crack?
- What is the difference between a Fresno and a bull float?
- What does troweling concrete do?
- Do you need to float concrete?
- Why does magnesium float on concrete?
- What is a Kelly float?
- What is the purpose of a bull float?
- What happens if it rains on fresh concrete?
- Can you float concrete the next day?
When should you float concrete?
Float the concrete when you’re done grooving and edging (Photo 6).
Floating removes the marks left by edging and brings the surface one step closer to a final finish.
You may have to bear down on the float if the concrete is starting to harden..
Can you finish concrete without a bull float?
Fresnos are used for troweling slabs that do not require a hard trowel surface. A Fresnos will speed up the troweling process. Fresnos should not be used as bull floats. Troweling can also be accomplished by machine.
What’s the difference between a trowel and a float?
A float has a thicker base than a trowel and is usually made of plastic, sponge, rubber, wood or magnesium – a lightweight pale grey metal. It’s used to even up the surface on plaster or concrete, make it firmer and give whatever texture is required.
How long should concrete cure before putting weight on it?
After 7 days, the concrete will have gained around three quarters of its compressive strength, but you should refrain from driving vehicles or heavy machinery over the surface until after the 28 day mark. For domestic mixes – driveways, for example – you can expect the concrete to be set within 24-48 hours.
Can you smooth concrete after it dries?
How do you smooth concrete after it dries? Sand the Surface and Wash the Concrete Finish by fine-tuning with light sandpaper, until the surface is perfectly smooth. We recommend using a hand planer to smooth and compact the surface.
What happens if you dont float concrete?
If the concrete isn’t kept moist for a few days it may crack. The problem is that the surface will dry out while the bottom is still wet causing tension, which basically tears the concrete apart.
Is a bull float necessary?
Once the screeding is complete, our team uses something called a “bull float.” While the name sounds kind of funny, finishing your concrete with this tool is extremely important. It helps the “cream” rise to the top of the concrete surface, creating a strong, beautiful finish!
What defects can be caused by bull floating too soon?
More often, premature finishing or improper first (bull floating) or second floating results in trapping rising bleed water and air below the top surface of the concrete (Image 2). When this occurs, the resulting weak or soft zone below the surface causes the top surface of the concrete to flake or scale off.
How thick does concrete need to be to not crack?
Applied-load cracking. In residential concrete, 4 inches is the minimum thickness for walkways and patios. Garage slabs and driveways should be 5 to 6 inches thick if any heavy truck traffic is anticipated, otherwise 4 inches is adequate.
What is the difference between a Fresno and a bull float?
A fresno is a large, long-handled trowel that looks similar to a bull float, except the blade is made of tempered or “blue” steel. … In fact, most manufacturers refer to a fresno as a fresno trowel. Just like a steel trowel, only use a fresno after the surface has been floated with a wood or magnesium float.
What does troweling concrete do?
Purpose: Used after floating to produce a smooth, hard, dense slab surface. … Putting a long handle on the trowel allows finishers to trowel the concrete without walking out onto the slab.
Do you need to float concrete?
Floating has to be done on virtually every concrete job after concrete is poured and leveled. (Leveling is usually accomplished with a screed.) When done properly, floating pushes the aggregate down into the concrete and encourages moisture to rise, helping the concrete dry and creating a smoother surface.
Why does magnesium float on concrete?
Magnesium smooths the surface of fresh concrete and opens the pores for proper evaporation, all without pulling the surface like a wood or resin tool. Most magnesium floats are extruded or cast. … Molten magnesium can be cast into any shape desired.
What is a Kelly float?
The power float or ‘Kelly float’ is equipped with adjustable wide handles to provide optimal control and comfort. … Perfect for trowelling off large areas of concrete and slabs to bring out the desired finish.
What is the purpose of a bull float?
The purpose of darbying or bull floating concrete is to level ridges and fill voids left by the screeding operation. It should also slightly embed the coarse aggregate to make subsequent finishing operations easier.
What happens if it rains on fresh concrete?
HOW DOES RAIN AFFECT CONCRETE? Rain falling on top of freshly laid concrete can damage the surface and compromise a level and floated finish. Even worse, if too much extra water works its way into the concrete mix, this can result in weak concrete overall.
Can you float concrete the next day?
Step 5 – Wait for Surface to Dry Wait for the water to completely drain back in before working any further on the slab. If you begin using a float too soon, you could sweep some of the water off the slab before it has a chance to be re-absorbed. Reducing the water content will weaken the surface of the concrete.