ABSTRACT Eko Supriyanto, 2007. The Effect of Kaliwiro Sand And Fly Ash as The "Filler" on The Hard Layer "Hot Mix" Applied to Marshall Value. This research was focused on the use of kaliwiro sand in Wonosobo as therefined aggregrate. Aggregrate set on 90-95% of the mix ratio, as the support for hot mix layer on the load of traffic effect and distributed on the underneath layer. Therefore,…