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  1. QCtech

    ACI 318 ch 7 question

    well, the design was 3/4" from the top of the stem wall and 3" from the sides. If the rebar was placed more than 3/4" from the top of the wall they are out of spec. Everything is minimum per aci...I am trying to understand what would maximum be, if there is is one per code. The engineer did not...
  2. QCtech

    ACI 318 ch 7 question

    Is there a a maximum concrete coverage for a #4 reinforcing steel stirrup in an 8-10 inch wide stem wall?
  3. QCtech

    ASTM E-329 (equivalent to a signature)

    In E-329 12.2.11 it calls for a "signature" or "an equivalent" on the test report. What would be an equivalent to a signature?
  4. QCtech

    Low compressive strength for grout

    F'm is 2000 with type S mortar and 3000 psi grout. The NDT method is not good due to the reinf. steel in the block. Only the reinf. cells are grouted. I know that the SER must approve or disapprove the components in place. The contractor wants to know what tests may be done for the grout to...
  5. QCtech

    Low compressive strength for grout

    The specified grout strength is 3000 psi for load bearing walls (with pilasters). The mix itself was a job site mix not a ready mix. The grout was tested in accordance with ASTM C1019 (using the cardboard grout boxes-not the old school block strategy).The compressive strength were 53% at 7-day...
  6. QCtech

    Low compressive strength for grout

    I have a low 56-day grout break. What investigative services can be done other than windsor probe (which is not exactly deependable)?
  7. QCtech

    CMU Block Construction

    I agree, the point with the strength was that we could not achieve 1800 psi at 28 days, very sandy, could crumble in my hand. They were not utilizing a bucket with a predetermined volume to weigh out the materials (just shoveling in). As for the discolored mortar, I just received the submittal...
  8. QCtech

    CMU Block Construction

    The black discoloration is in the mortar only. The mortar was mixed by hand and not preproportioned (we had numerous problems with getting them to have the proper mix just to achieve compressive strength). I am awaiting the damp proofing submittal info from the contractor. I will post as soon as...
  9. QCtech

    CMU Block Construction

    PT wood? possibly. Again I am not an expert at this, so, how about a petrographic exam.
  10. QCtech

    CMU Block Construction

    I actually had a chance to go see what's up with the block. It is not mildew/mold. However, the mortar joint itself, along the roof line, in conctact with wood blocking, is actually turning colors (gray/ black). The block wall has been up for a few months. I am still stumped though. I am not a...
  11. QCtech

    CMU Block Construction

    Mold - Mildew ? You are probably correct. If they didn't construct their weep holes properly and moisture got trapped within the cavities. I just thought maybe there was some known impurity that can contaminate the water or cement during the block casting or mortar or grout mixing processes.
  12. QCtech

    CMU Block Construction

    I have two questions: 1) I have read somewhere either ACI or a spec book that a CMU wall should not be grouted on the same day as the block was placed. Does anyone know if there is a spec for this? 2) What would turn CMU block or brick veneer the color black (new construction)?
  13. QCtech

    concrete aggregate correction factor

    I have recently gone through the CCRL inspection. The correction factor for air content in the aggregate and sand is a hit we took. I have called several local suppliers/associations and have had no real feed back. Other than going to the how ever many quarries (whether barged or excavated) to...

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