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Schmidt hammer testing on concrete

  • 23-04-2012 8:02pm
    #1
    shanered
    Registered Users, Registered Users 2 Posts: 1,117 ✭✭✭


    Hi I am writing up a lab for college but having a little trouble.


    Reading Position Angle held from surface of concrete Value
    1 90° 54
    2 90° 49
    3 90° 55
    4 90° 49
    5 90° 45
    6 90° 45
    7 90° 27
    8 90° 44
    9 90° 40
    10 90° 39.5

    Above are the results I got.
    I am just a little unsure about applying the adjustment rates.

    Rebound Value Correction for inclination angle
    R (+)90°(+)45°(-)90° (-)45°
    10 n/a n/a (+)2.4 (+)3.2
    20 (-)5.4 (-)3.5 (+)3.4 (+)3.4
    30 (-)4.7 (-)3.1 (+)2.3 (+)3.1
    40 (-)3.9 (-)2.6 (+)2.0 (+)2.7
    50 (-)3.1 (-)2.1 (+)1.6 (+)2.2
    60 (-)2.3 (-)1.6 (+)1.3 (+)1.7

    Above is the adjustment table for the values.
    I held the hammer vertical to the concrete floor while getting these results, I am just a little confused on how exactly adjust my results according to the table.
    Any guidance would be great,
    what I'm guessing is that you literally add the adjustment numer to the value between the say 50-60 range it would be -3.1 in the +90 degrees catergaory.
    But I', unsure between the plus and minus degrees and whether you apply it directly or what....
    Hopefully somebody can clarify this for me!
    Thanks in advance!!!


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