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Method of feeding water to a concrete mix

  • US 4,318,177 A
  • Filed: 12/20/1979
  • Issued: 03/02/1982
  • Est. Priority Date: 12/21/1978
  • Status: Expired due to Term
First Claim
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1. A method of controlling the water added to concrete batches, comprising the steps of:

  • (a) determining for a given concrete recipe and batch size, while mixing same, a series of empirical values of water quantity and consistency of the resulting mix by initially feeding a quantity of water to the batch reduced by an amount equivalent to the moisture content of the aggregates of the batch at maximum intrinsic moisture content and thereafter incrementally adding water while measuring the consistency after each water addition;

    (b) storing said values for the respective recipe and batch size; and

    (c) for the addition of water to a further batch of said recipe, while mixing the further batch;

    (i) adding an initial quantity of water to said further batch which is not reduced by the quantity of water equivalent to the moisture contents of the aggregates,(ii) measuring the consistency of the further batch after the initial addition of water thereto,(iii) interpolating between stored water values corresponding to stored consistency values neighboring the measured consistency of step (ii) to obtain a first water quantity and interpolating between stored water values corresponding to stored consistency values for a set point consistency of the further batch to obtain a second water quantity, and obtaining an additional water quantity from the difference between said second and first water quantities, and(iv) adding said additional water quantity to said further batch in a single increment.

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