Performance Evaluation of Hybrid Fibers and Nano-zeolite Modified Asphalt Micro-surfacing

Micro-surfacing is a cationic mixture for reparation and maintenance of asphalt pavement and contains polymer-modified bitumen emulsion, 100 % manufactured well-graded fine aggregate, mineral filler, water, and chemical additives. The object of this study was to extend the lifespan of a Micro-surfacing mixture against traffic loads to obtain a higher performance asphalt mixture using different additives, including Diatomite filler, nano-zeolite, styrene butadiene rubber, and glass fiber. To evaluate the performance of the mixtures, a variety of experimental tests, including the abrasion test (International Slurry Surfacing Association [ISSA] TB 100), adhesion test (ISSA TB109), and Wet Cohesion test (ISSA TB139) and Scanning Electron Microscopy, were conducted to classify Micro-surfacing quality control against traffic loads. Cohesion test results showed that adding 2 % nano-zeolite and 4 % polypropylene increased loading resistance up to 25 % (Quick Set and Quick Traffic). In addition, using 10 % of Diatomite improved abrasion resistance. It is worth noting that with an increasing dosage of asphalt emulsion, the effect of the additives will also increase. Moreover, adding 0.26 % of glass fiber in the mixtures increased bleeding resistance around 14 %.