In preparing for thi.
Cause of concrete patio deterioration below siding.
The following summary discusses potential causes of concrete deterioration and the factors that influence them.
A frequent reason behind a darkened concrete appearance is the addition of calcium chloride to accelerate the setting time of concrete see photo 1 especially when calcium chloride dosages approach 2 by weight of cement.
Inadequate mixing after addition of calcium chloride makes the concrete color even more irregular or blotchy.
How do delaminations happen.
In addition to concrete damage power washing horror stories include stripping paint off of houses ripping off siding and shingles damaging wood decks destroying car paint jobs and even causing serious injuries.
In the phone interview the concern is over the distance to the siding.
A diyer or a novice painter might attempt to achieve a cleaner look by caulking the siding nails but the nail is guaranteed to push the caulking material out within a few months.
This natural settlement causes excess mix water and entrapped air to be displaced called bleeding and the lighter materials migrate toward the surface.
Corrosion of embedded metals fig.
When fresh concrete is placed and compacted the solids cement and aggregate settle.
Humidity levels can be so high in leaky basements that water vapor can form on the.
When the water in the pores freezes it expands causing scaling and delaminations.
30 50 and 100 sieves resulting in a sticky or tacky concrete that can become more easily sealed when floating or finishing it at any early age.
What s been discovered is a surface delamination in the concrete floor.
I have a client that would like me to come over and evaluate his patio.
An excess amount of entrapped air held within the concrete by a high percentage of material passing the 600 µm 300 µm and 150 µm no.
When the lower edge of the siding is below grade moisture can be wicked up behind the siding and insects and vermin can enter the building unobserved.
Corrosion of reinforcing steel is the most common cause of concrete deterioration.
Siding nails should not be caulked another item that needs room to play is siding boards themselves.
Concrete absorbs water into its pores.
Attribute blistering to three principal causes.
Either can cause severe damage to building materials behind the siding.
I have always worked with the notion that a concrete patio should at minimum have a least 2 of clearance from the last row of siding.
High strength concrete mix designs that incorporate air entraining admixtures yield the best defense against freeze thaw damage.
Water saturated concrete combined with temperature cycling above and below 32 f 0 c.
Concrete can deteriorate for a variety of reasons and concrete damage is often the result of a combination of factors.
