NO. you should never pour concrete on any pvc conduit or water pipes unless you wrap the pipes with a form wrap to allow expansion and contraction and any penetration thru the concrete or install a 4in or 6in sleeve under the slab to pass the pipes though.

Can PVC pipe be encased in concrete?

It is never that safe to bury PVC pipe in concrete. When the pipe is buried, the pressure from the soil and water causes it to fracture which leads to an eventual leak. The best way to install PVC pipes underground is by putting them into a trench that has been backfilled with sand or gravel.

Does PVC react with concrete?





A. According to Bernard Erlin, the principal chemicals in concrete that could conceivably attack plastics are calcium hydroxide, sodium hydroxide and potassium hydroxide. Erlin cites a table from Handbook of Chemistry and Physics stating that rigid PVC has excellent resistance to strong alkalies.

Can you cement around plastic pipes?

plastic pipe will also react against cement. all plastic pipe web sites will tell you it must be insulated.” The plastic pipe will not react against cement.

How do you bond PVC pipe to concrete?

The process involves applying primer to the outside of the pipe and the inside of the fitting, which cleans and preps the PVC. After about 10 seconds, you next apply cement to the same areas, then insert the pipe snugly into the fitting and allow the cement to set.

How long does PVC last in concrete?

Defining shelf life

Product Shelf Life (from date of manufacture)
PVC Cements, Primers, and Cleaners 3 years
ABS Cements and Cleaners 3 years
CPVC Cements 2 years




Does PVC need primer and cement?

Usually PVC jobs require about half the amount of primer as they do cement. In short, primer is your friend. It may not be completely necessary on all jobs, but we recommend you take all the precautions available to ensure your joints are leak-free and as strong as possible.

Does cement stick to plastic?

Lumber mills often pretreat their wood with oil-based blends to make it stick-resistant. If your wood has not already been treated, you may have to purchase a commercial agent and apply it yourself. Concrete also sticks very well to plastic.

Does concrete bond to concrete?

Concrete is made of cement, stone and sand mixed with water. None of those ingredients contain any natural bonding agents. So when wet concrete is poured or applied to existing concrete, the two won’t join. Once cured, the new concrete will simply sit on top as a different layer.

Whats the difference between cement and concrete?



Although the terms cement and concrete are often used interchangeably, cement is actually an ingredient of concrete. Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. Concrete gets stronger as it gets older.

How do you make concrete not stick to mold?

Coat the mold with a release agent to prevent concrete from sticking, advises Smooth-On. The release agent forms a thin film that lubricates the mold so the concrete will slip right out once it has dried.

Can I use a 5 gallon bucket as a concrete mold?

Regular 5 gallon buckets have mostly parallel sides, so any bulging will make the concrete wider than the top and not want to come out. You might want to check out getting different buckets too.

What can I use for concrete release agent?



It’s best to use a release agent like Smooth-On’s AquaCon┬« water-based concrete release agent to protect the mold. Urethane rubber does not have great release properties to begin with, so a release agent is recommended from the start.

Will concrete cure in plastic bags?

For temperatures in between, use clear plastic sheeting. While plastic sheeting is highly effective in helping concrete cure without cracks, there is a downside: The concrete will be discolored anywhere the plastic touches it.

How long should you cover concrete with plastic?

A: The longer concrete stays damp after it’s poured, the stronger it will be. Cover it with plastic or damp cardboard for a minimum of three days. A week is even better.

Will concrete dry if covered?

It can protect the new concrete from environmental cooling and heating fluctuations as it cures, and it helps resist uneven curing due to rapid moisture loss at the top. Leave it covered for 24 hours.