Nowadays, the most common ways to dispose of acid tars and paper production waste are
burial or incineration, but it is ecologically and economically expedient to use such waste in building
materials. A new variant of filler aggregate—wastepaper sludge ash (paper production waste) and a
chemical activator for filler aggregates—acid tar (oil-refining industry waste) is proposed. Elemental
and mineralogical compositions of wastepaper sludge ash for comparison with commodity limestone
mineral powder are established. Chemical activation of wastepaper sludge ash and limestone mineral
powder was carried out and the wetting properties of the obtained materials were investigated
by means of primary and neutralized acid tar. The physical and mechanical properties of stone
mastic asphalt samples with different filler aggregate variants were studied. The possible chemical
transformations in stone mastic asphalt using limestone mineral powder and wastepaper sludge ash
activated by acid tar are shown. The possibility of replacing traditional limestone mineral powder
with industrial wastepaper sludge ash has been proven, and the effectiveness of activating filler
aggregates by acid tar has been confirmed. It was established that acid tar as an activator for filler
aggregates does not require neutralization because stone mastic asphalt, in this case, demonstrates
better properties compared to acid tar neutralization. As a result of our research, the application
of wastepaper sludge ash is possible as a filler aggregate for stone mastic asphalt. And to obtain
improved stone mastic asphalt characteristics, wastepaper sludge ash is required to activate 5 wt.%
acid tar.