This entry was posted on March 20, 2012.
Hydraulic cement is a popular solution for crack repair because it is easy to use, convenient to buy, and very cheap. While it can be used as a temporary repair, it can't actually repair a crack. Here's why:
- Hydraulic cement is cement. If you inject it into the crack it will fill the crack with cement but it won't actually bond to the concrete that surrounds the crack. Eventually, the hydraulic cement will get pushed out, crack, or a new crack will form around the repaired one. If the crack suddenly starts leaking, the hydraulic cement will have to be removed so the crack can be properly repaired.
- Hydraulic cement can't be used to stop water and can't be used where water is present. If the crack is wet or leaking, or if the crack becomes wet, hydraulic cement won't cure and the uncured cement will be diluted and pushed out. The hydraulic cement in the crack will have to be repaired so the crack can be properly repaired.
- Hydraulic cement, once dry, has pores. Water, moisture, vapors, and radon can still pass through the pores.
Hydraulic Cement Alternative
The proper way to repair a crack is with a high pressure polyurethane concrete repair kit. The polyurethane will expand its volume 40X to fill the entire crack - from back to front. The reacted solution bonds to the concrete - permanently. It can be used to stop water and once dry, stops water, moisture, vapors, and radon.