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  1. drfefefe

    ASTM Specification on Grain Size Analysis for Gravel and Cobbles

    Boulders >12" Cobbles Pass 12" and retained in 3" Gravel Pass 3" and retained in # 4 sieve (4.74mm)
  2. drfefefe

    ASTM D698 vs D1557

    I already have the correlation between the proctor standard and the modified proctor. If you mail me the proctor curve, I will return you the modified curve, for any kind of material. I am writing a book about the Proctor test and other laboratories testes. These is part of my researches, and I...
  3. drfefefe

    Modulus of subgrade reaction

    The best formula for this correlation according with my experience is: K=-3.03E-05(CBR)^4+0.0069(CBR)^3-0.571(CBR)^24.305(CBR) CBR K 0 0 3 68 5 108 10 193 20 308 30 377 35 402 45 442 50 461 60 500 70 543 75 563 80 582 90 604
  4. drfefefe

    Repairing cracks in concrete walls

    You can take information de repair product in Sika or another company, but is necessary identify first what is the matter of the cracking, if is it superficial, if it is coming with water flow, if it is due to bad vibration of the concrete,if it posible repared for one or other face or boths...
  5. drfefefe

    cube strengths

    The ratio between the cubic resistence and de cylinder resistence have a average of 0.8, whatever was his size, but it has to be taken into acount that the mold size shall be at least three times the nominal maximun size of the coarse aggregate,also in the test is necessary use squares contact...

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