Reuse of Zeolite By-Products Derived from Petroleum Refining for Sustainable Roads

Table 4

Testing plan.

Study step	Mixtures	Zeolites	Manufacturing temperature (°C)	Tests
Zeolite characterization	—	Zeolite 1; Zeolite 2; Reference Zeolite	—	(i) Water absorption; (ii) Water release
Design of WMA	HMA	—	165	(i) Workability; (ii) Stiffness modulus at 20°C; (iii) Indirect tensile strength (20°C)
	WMA-R	—	145–120
	WMA-Z1	0.1–0.3–0.5% Zeolite 1	145–120
	WMA-Z2	0.1–0.3–0.5% Zeolite 2	145–120
	WMA-RZ	0.1–0.3–0.5% Reference Zeolite	145–120
Performance of WMA	HMA	—	165	(i) Water sensitivity; (ii) Stiffness modulus at 5–20°C–40°C; (iii) Wheel tracking; (iv) Triaxial; (v) UGR-FACT
	WMA-Z1	Optimal % Zeolite 1	Optimal
	WMA-Z2	Optimal % Zeolite 2	Optimal