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Home > Main Index > Markets > Construction Applications > Perlite Concrete > Transit Mix Guidelines and Procedures > Field Check For Yield

Field Check for Yield:

The first step necessary in making a field check for yield is to determine the wet density of the perlite concrete as previously outlined.

The wet density and the weight of total ingredients for the mix being used are then substituted in the following formula:

1. ^{Weight of Total Ingredients} ÷ _{Wet Weight per Volume of Concrete} = Yield
2. ^Yield ÷ _{Weight of Total Volume of Perlite Aggregate} X 100 = % Yield

• Example:

  Consider a 1:6 mix (94 lbs. Of Portland cement to 6 ft³ of perlite)

  The wet density as determined in Example No. 1 is 40.2 lbs/ft³.

  The weight of total ingredients is as follows:

  Portland Cement	94.0 lbs.
  Perlite--6 ft3 @ 8.0 lb/ft3	48.0 lbs.
  Water--12 gallons @8.33 lbs./gal	99.96 lbs.
  Air Entraining Agent	negligible
  Total	241.96 lbs.

  Substituting in formula (a): ^241.46 ÷_40.2 = 6.0 = Yield

  Substituting this value in formula (b): ^6.0 ÷ ₆ X 100 = 100%

• Example: (using metric units)

  Consider a mix of 42.73 kg of portland cement to 6 ft³ of perlite (0.17 m³ of perlite)

  The wet density as determined in the Example is 643 kg/m³.

  The weight of total ingredients is as follows:

  Portland Cement	42.73 kg
  Perlite--0.17 m3 @ 128.0 kg/m3	21.17 kg.
  Water--45.42 liters	45.42 kg
  Air Entraining Agent	negligible
  Total	109.32 kg

  Substituting in formula (a): ^109.32 ÷_643.6 = 0.17 = Yield

  Substituting this value in formula (b): ^0.17 ÷ _0.17 X 100 = 100%

Information given herein is from sources considered reliable, but no guarantee of accuracy can be made or liability assumed.  Your supplier may be able to provide you with more precise data.  Certain compositions or processes involving perlite may be the subject of patents.
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