"This research investigated the properties of solidification of zinc-electroplating sludge using calcium carbide residue (CCR) and black rice husk ash (BHA) as binders and sodium silicate solution and sodium carbonate as activator. The compressive strength, setting time leachability using TCLP method and durability were studied. The first step studied the optimum ratio between CCR and BHA of 70:30 60:40 50:50 40:60 and 30:70 wt.%. The results showed that the highest compressive strength was found 60:40 of ratio between CCR and BHA. This ratio was activated using sodium silicate solution and sodium carbonate at the levels of 2 and 4 wt.% as binders solidified 30 and 50 wt.% of zincelectroplating sludge. Addition of sodium silicate solution and sodium carbonate increased the compressive strength and decreased of CCR and BHA paste. Both activators can rapid developed the early strength (3 days). The 4 wt.% of sodium silicate solution and sodium carbonate increased the compressive strength from 11.1 to 30.5 and 34.5 kg/cm2 . When 30 and 50 wt.% of zinc-electroplating sludge were added, the compressive strength decreased and setting time increased. At 3 days of solid wastes solidified 50 wt.% of zinc-electroplating sludge did not remolded but both activators were added, they can remolded since 1 days. Addition 4 wt.% of sodium silicate solution and sodium carbonate in solid wastes containing 50 wt.% of zinc-electroplating sludge have compressive strength of 3.45 and 5.58 kg/cm2 . The leaching results (TCLP method) showed that the concentration of Cr in leachate from solid wastes containing 50 wt.% of zinc-electroplating sludge over the standard of USEPA (5 mg/L) except solid wastes with 4 wt.% of sodium carbonate. The durability resulted showed that synthesis acid rain can erode the solid wastes solidified 50 wt.% of zinc-electroplating sludge and without activators through full area that was showed in highest weight loss. In addition, solid wastes containing 4 wt.% of sodium silicate solution and sodium carbonate were eroded from external surface to inside about 5-10 mm. At erosion zone found increase of SO3 content because of reaction between sulfuric acid from synthesis acid rain and Ca from CCR and decalcification of CSH in solid wastes to form gypsum. It resulted in swell and reduction strength of solid wastes structure. "