Abstract:
Concrete production industries have consistently grown up over years. However,
the problem frequently found in those industries is that the pressing power of concrete
has not reached to the standard required. Thus, the selected factory has solved this
problem by reserving cements in the concrete mixing process around 80 kg/ m3 in each
batch which directly impacts on increasing production costs. The purpose of this study
is to investigate an optimal factor condition for reducing the reserve cements in the
concrete mixing process. A general full factorial experiment consists of four main
factors, that is, sizes of rock, sizes of sand, total mass ratios, and ripeness time. By
which, the experiment was repeated six times and used statistical analysis at the 95%
confidence level. The results indicated that all factors had significantly influenced on the
concrete power and the optimal condition for concrete power at 240 or 250 kg/cm2 was
1 inch for rock size, coarse for sand size, and 0.42 for total mass ratio. Also, the
appropriate ripeness time was 7 days. According to the results, the company could use
this optimal condition for decreasing the reserved cements in the future.