Optimization of Concrete Containing Polyethylene Terephthalate Powder and Rice Husk Ash Using Response Surface Methodology

Table 2

Mathematical equations of the responses.

Response	Constant	A	B	AB	A ^2	B ^2
Slump (mm)	40.94	1.422	+0.800	−0.044	−0.039	−0.056
Compressive strength (N/mm^2)	+23.472	+0.0555	−0.6333	+0.0222	−0.0237	+0.00296
Flexural strength (N/mm^2)	+2.7422	−0.00556	−0.08311	+0.00124	−0.00193	+0.00065