Utilization of Six Sigma in Quality Improvement of Recycled Aggregates Concrete

Table 7

Summary of the three-level full-factorial DOE design.

Levels	Impact factor
	Quality of aggregates	w/c	% Recycled coarse aggregate	% Recycled fine aggregate	Curing
High	BEST	0.5	25%	25%	RH100%
Medium		0.6	50%	50%
Low		0.7	75%	75%