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How to Repair a Concrete Post

By Donna Armstrong
Cracks in concrete allow water to seep in cause more damage to the post.
Concrete street cracks image by Dreadman from Fotolia.com

Damaged concrete posts can lead to serious structural problems that cost hundreds of dollars to repair. The most common examples of damage to concrete posts are holes, cracks and damaged corners if the post has a square base. Repairing a concrete post is inexpensive and easily done with a few supplies.

Step 1

Clean the post around the area that is being repaired. Use a small amount of water on a sponge or rag and wipe away any residue or debris that is in or around the area. Let the post dry completely. If the crack or hole has water in it, the epoxy and Sakrete will not adhere properly.

Step 2

Activate the epoxy putty and fill the hole, crack or damaged corner with it. Press as much epoxy as possible into the area. If the post has a decorative square base and has damage try to form the epoxy to the shape of the square. Use the towel to smooth the epoxy out and press the epoxy inward to fill the crack. Let the Epoxy set for at least two hours.

Step 3

Mix a small amount of Sakrete and water. All brands of ready-mix concrete are different, so read the bag for proportions of water to concrete mix. Cover the area where the epoxy was placed with a layer of concrete. Smooth it out as much as possible to get an even coat.

Step 4

Wrap the area with the plastic sheeting and tape. Let the repair dry for five days. Sprinkle the repair with water every day and replace the plastic. The plastic will help to cure the concrete and keep it from cracking. Remove the plastic after five days.

Step 5

Remove the plastic sheeting and inspect the post. Sand any areas that are rough or do not look flush with the post. Remove any dust left from the sandpaper with a dry paint brush.

Step 6

Apply an even coat of concrete sealant to the entire post with a paint brush. Do not apply large amounts of sealants at one time, to avoid runs or drips. Most sealants dry within 30 minutes and are clear coats. The sealant will protect the post against water damage and prevent cracks.


Things You Will Need

  • Water
  • Gloves
  • Sponge or towel
  • Epoxy putty
  • Sakrete or other ready-mix concrete brand
  • Trowel
  • Tape
  • Plastic sheeting
  • Sand paper
  • Concrete sealant
  • Paint brush

About the Author


Donna Armstrong is a freelance writer who has been writing since 2005. She has provided copy for catalogs, newspapers, newsletters, blogs, informational and e-commerce websites. She has written on a variety of subjects including state-of-the-art electronics and household products. She has worked for such websites as Work.com and Realtvaddict.com. She attended the University of Texas, where she studied history and education.