The complexity of specifications and the number of materials
options available today for concrete production mean that the
traditional procedure of making trial mixes is now unnecessary,
expensive and time consuming. However the data generated by trial
mixes can be incorporated into the development of computer-based
systems and combined with knowledge generated through research and
practice. J.D Dewar has spent much of the 20 years between 1979 and
1999 developing systems by which a small amount of materials data
can be used confidently to predict the composition of the ideal
product to satisfy a specification with maximim economy, or to
provide the "batch book" to fulfill all requirements using a
specified combination of materials. Equally useful is the potential
for forward control by the continuous adjustment of designs to take
account of current or developing materials properties.
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