How do you fill a dirt hole in concrete?
Remove large chunks of broken concrete and sweep out the hole with a stiff broom; flush it thoroughly with water from a garden hose. Then remove standing water with a sponge. Mix ready-mix concrete according to the manufacturer's instructions; use sand mix for small holes and gravel mix for large or deep ones.
How do you fill erosion under concrete?
The best way to fix erosion under concrete is to fill voids with material that's resistant to erosion. This is usually done with the slab jacking process. Scritchlow Concrete Lifting and Slab Jacking uses only crushed limestone and Portland cement which is not susceptible to erosion.
Why does my concrete floor sound hollow?
Instead of the clear ringing sound you would expect when metal hits solid concrete, a drummy sound or loud clack draws your attention. Using the hammer to tap around this spot, you identify more hollow-sounding areas. What's been discovered is a surface delamination in the concrete floor.
Can you over work concrete?
Overworking can create excessive mortar at the top surface but primarily overworking the surface can significantly reduce or even destroy the air-entrainment along the surface of the slab as shown in Image 3.
What is drummy concrete?
Delamination is the detachment of a thin (typically from 3mm to 6 mm in thickness) surface layer from the rest of the slab. It is initially manifested by a 'drummy' sound when the pavement is tapped or trafficked. ... This mortar will eventually delaminate from the underlying concrete layer.
What causes spalling in concrete?
In most cases, spalled concrete is caused by poor finishing and the use of water on the surface to aid in the finishing process. Excess water and overfinishing create a weak surface that can't handle freeze-thaw expansion and contraction.
How do you seal concrete spalling?
Mix one part Type 1 Portland cement and one part fine sand by volume. Add water until the mixture is the consistency of thick paint, then brush it on the damp concrete.
How do you fix exposed rebar on concrete?
The traditional method of concrete repair is to remove the cracked and degraded concrete to a depth of 20 to 30 mm behind the reinforcing bars to fully expose the rusted reinforcement and move the contaminated concrete away from the steel. All corroded material is removed and the steel is either treated or replaced.
How do you fix exposed rebar?
Fixing Rebar the Right Way Spalling is best corrected by using a high-pressure sprayer to remove any and all surface rust that may be present. Next, a specialty protective coating containing anti-corrosive agents is applied to the exposed metal to prevent further damage.
Does rebar in concrete rust?
But, while steel reinforcement solves one of concrete's greatest limitations, it creates an entirely new problem: Corrosion of embedded steel rebar is the most common form of concrete deterioration. ... The high pH of normal concrete creates a thin oxide layer on the steel that provides protection from corrosion.
Can you use rusty rebar in concrete?
As long as there is not loose, flaky rust, the concrete will bond to it better than a smooth, or painted surface. Re: Rusty Rebar?!? Do NOT weld rebar and then put the welded joint in the concrete, that is not allowed by building codes. Virtually all rebar has that thin film of rust on it.
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