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  1. NM1010

    Verifying frost removal from subgrade for concrete base slab

    Thanks for the input. A little more information on the site. The subgrade is generally undisturbed material composed of silty river gravels with medium to large cobbles. The site is actively being dewatered with wells that are 6m below grade. Frost depth in our area is typically estimated at...
  2. NM1010

    Verifying frost removal from subgrade for concrete base slab

    Hi, I am working on project in Canada where we are constructing a large concrete tank on grade. The contractor allowed the subgrade to freeze after preparing the subgrade and placing a protective mudslab. Once the reinforcement for the structural base slab is installed, they plan to heat and...
  3. NM1010

    Checking that concrete sealer was applied

    Hi, I am wondering what technique(s) can be used to test if a penetrating silane sealer has been applied to a concrete surface. I am working on a bridge project where the contractor is claiming that they applied a penetrating silane sealer to the abutment and pier bearing seats. We suspect the...
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