AHP-Based Evaluation Model for Optimal Selection Process of Patching Materials for Concrete Repair: Focused on Quantitative Requirements

International Journal of Concrete Structures and Materials

Table 11 Indicators of each required performance and those corresponding performance indices.

Required performance		Meaning of performance indicator	Indicator	Performance index
Chemical performance	Alkali resistance; QC31	Less than 0 %	Very low	1.000
		0 to 1 %	Low	0.593
		1 to 3 %	Moderate	0.343
		More than 3 %	Negligible	0.204
	Chloride Permeability; QC32	Less than 100C	Very low	1.000
		100 to 1000	Low	0.455
		1000 to 2000	Moderate	0.286
		2000 to 4000	Negligible	0.105
	Electrical resistivity; QC33	More than 254 kΩ cm	Very high	1.000
		37 to 254 kΩ cm	High	0.464
		21 to 37 kΩ cm	Moderate	0.208
		12 to 21 kΩ cm	Low	0.098
Physical performance	Bond strength; QP31	More than 3.0 MPa	Very high	1.000
		3.0 to 2.5 MPa	High	0.601
		2.5 to 2.0 MPa	Moderate	0.359
		2.0 to 1.5 MPa	Low	0.154
	Compressive strength; QP32	More than 50 MPa	Very high	1.000
		30 to 50 MPa	High	0.464
		27 to 30 MPa	Moderate	0.208
		Less than 27 MPa	Low	0.098
	Drying strength; QP33	Less than 0.03 %	Very low	1.000
		0.03 to 0.04 %	Low	0.400
		0.04 to 0.05 %	Moderate	0.190
		0.05 to 0.1 %	Negligible	0.090
	Elasticity; QP34	More than 20 GPa	Very high	1.000
		13 to 20 GPa	High	0.593
		8 to 13 GPa	Moderate	0.343
		5 to 8 GPa	Low	0.204
	Tensile strength; QP35	More than 2.5 MPa	Very high	1.000
		2.5 to 2.0 MPa	High	0.601
		2.0 to 1.5 MPa	Moderate	0.359
		1.5 to 1.0 MPa	Low	0.154
	Thermal expansion; QP36	Less than 10 millionths/°C	Very low	1.000
		10 to 12 millionths/°C	Low	0.464
		12 to 14 millionths/°C	Moderate	0.208
		14 to 16 millionths/°C	Negligible	0.098