Concrete repairs Beaverton Oregon
So which material is better for repairing concrete cracks: epoxy or polyurethane foam? The answer isn’t always clear-cut. In many cases, either material can accomplish the task, or applicators may simply choose the material they have the most experience with. But here are some general guidelines: If the crack needs to be structurally repaired and the area needs to be as strong as the concrete or stronger than the concrete around it, use an epoxy. If the crack needs to be repaired only to prevent water leakage or the crack is actively leaking, a polyurethane is usually the best choice. Here’s a look at the advantages and limitations of each material.
Epoxies for crack injection are available in a range of viscosities, from ultra-thin to paste-like, to accommodate cracks of different widths. It is better to use whatever viscosity is needed to inject a given crack at pressures less than 40 psi. The wider the crack, the thicker the material required.
The main advantage of epoxies is their amazing compressive strength, which at 12,000 psi or greater exceeds that of most concrete. That’s why epoxies are the only choice for cracks requiring structural repair. However, epoxies cure very slowly, generally taking hours to harden. This can be an advantage because it allows time for the epoxy to flow into even the smallest crevices. On the other hand, it is also possible for the epoxy to flow out of the backside of the crack before it has hardened if the backfill outside the wall has separated from the foundation.
Often there are voids behind cracks due to soil erosion or poor compaction. That’s why the crack is leaking in the first place; it is easy for water to enter.
If there is concern about material leaking out the back of a crack, polyurethane foams should be used. These elastomeric, fast-setting foams are effective alternatives for applications involving only crack sealing (waterproofing) and not structural repair. Because of their elastomeric nature, they are able to accommodate slight concrete movement so the seal stays intact. They also begin to harden and foam within minutes of injection. This reduces the chances of the material flowing out of an injected crack while still in liquid form, and even if some does leak out, the foam will fill the void.
Concrete sidewalks come in a close second to concrete driveways in the amount of traffic they receive. And just like driveways, they are often treated with deicing salts in the winter. All that wear and tear and chemical abuse can take a toll on the appearance of concrete walkways by causing abrasion, spalling, stains and freeze-thaw damage. The good news is that if the damage is superficial, as is often the case, it’s possible to restore and upgrade the appearance of your concrete walkway rather than go through the expense and hassle of replacing it.
Resurfacing with a cement-based overlay or microtopping is a cost-effective option for adding a decorative touch to an existing concrete walkway while covering up minor flaws and discoloration. After the overlay is applied to the existing concrete, it can then be stamped, stained, stenciled or engraved to add color or simulate the look of brick, stone, tile or slate. Before beginning a concrete walkway resurfacing project, be sure to consult concrete contractor Beaverton Oregon to determine if your concrete can be resurfaced successfully. If the concrete slab is settling or is badly cracked, resurfacing may not be a viable option.
As its name suggests, a retaining wall is used to support, that is to say, to contain and withstand the very strong pressures of land, most often composed of soil or sand. Generally, it helps to fight against landslides and landslides when the ground is sloping. It is widely used on the banks and public roads but the retaining wall also has its use in private gardens.
The retaining wall consists of a base wheelbase, breeze blocks in some cases, and must be drained to prevent water from seeping in and eventually causes cracks. To fight against moisture, many people apply a water repellent coating or even tar. In individuals, the retaining wall can also have a decorative function in gardens that are located in particular slope.