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03 June 2013

How to Choose a Grout for Sealing Mainlines and Laterals

Posted in Water & Wastewater

Below are some questions to consider when choosing a grout for sealing mainlines and laterals--before, after, or independent of lining:

  1. Cost: Cost should only be one factor. What is more important is that you are using the appropriate product for the job and the grout is applied correctly--in accordance with the 2012 NASSCO recommendation is a good start.
  2. Cost vs. Cure Time: Grouts have different cure times. Be sure to check tech data sheets to determine how much control over cure time you will have in the field. Better yet, you can do a more thorough investigation by performing your own tests. The more catalyst you need to reach the desired goal, the more money you'll spend on product.

03 June 2013

Joint Failure Not Always Obvious--Test Every Joint

Posted in Water & Wastewater

I visited a job site a few weeks ago and talked with the grouting operator. I found three things very cool:

  1. It was nice to visit a grout truck that was kept clean and orderly. This was a municipality that only has one crew responsible for each grout truck, so they treat it like their own.
  2. They air tested every joint. There is no point in grouting only the visible leaking joints and ignoring the ones that are not noticeable. The joints must pass an air test or should otherwise be grouted. If not, once you grout the leaking joints, the groundwater simply migrates to the next joint and enters there.

31 May 2013

Miami-Dade Attacks Infiltration and Scores Major Win for the Community

Posted in Water & Wastewater

I recently visited with Rod Lovett and Juan Bedoya with the Miami-Dade Water and Sewer Department. It was great to see them and meet some of their crew. Last year alone, Miami-Dade invested in nine new grout trucks. After 25+ years of grouting, it is encouraging to see one of the largest municipalities in the country so committed to stopping water infiltration.