synergistic effect of 4a zeolite from rice husk ash without aging time and silane on the adhesion properties of a warm mix asphalt

4a zeolite was synthesized using rice husk ash (rha) as a raw material in a microwave-assisted hydrothermal synthesis. two new procedures were proposed: procedure a, using rha as the raw material, and procedure b, using the depolymerized rha. both procedures were performed using microwave-assisted hydrothermal synthesis, and neither synthesis required an aging time. crystallinities of over 90 and 80% were reached at 100 °c after 30 min of microwave heating for procedures a and b, respectively. the obtained zeolites were used as warm mix asphalt additives, and the performance of the zeolite obtained from procedure a was better. additionally, the zeolite obtained from procedure a and commercial silane were used separately as asphalt-aggregate adhesion promoter. an increase in the adhesion percentage from 30% of a blank sample to 94% was observed.