Properties of the Warm Mix Asphalt involving clinoptilolite and Na-P1 zeolite additives

• New direction of using the Na-P1-type synthetic zeolite produced from fly ash.
• NaP1-type synthetic zeolite and natural zeolite addition significantly decreases the mix asphalt compaction temperature.
• Soaking of the zeolite minerals with water allows to decrease the amount of zeolite d to mix asphalt.

The use of Warm Mix Asphalt (WMA) resulted in road construction being more environmentally friendly and more economical. One of the WMA production methods is asphalt foaming through addition of different modifiers, including zeolites. In this study, a possibility of decreasing the compaction temperature of AC 16 W 35/50 WMA was analyzed. The applied additives included: NaP1-type synthetic zeolite obtained from fly-ashes and natural zeolite – clinoptilolite. Both zeolite materials prior to the process of asphalt foaming were soaked with water. In the conducted compactibility tests in a gyratory compactor, the optimal of zeolite additive was established, which included 1% clinoptilolite, 0.5% NaP1 and 0.4% of both zeolites soaked with water w/m. For mix asphalt with optimal zeolite amount, tests of air void content, stiffness modulus, water sensitivity and resistance to rutting were performed in different compaction temperatures.