Eligibility of Nickel Slag Waste Combined with Stone Ash for Manufacturing Paving Block

The application of concrete paving block of nickel slag waste (NSW) to develop low-cost construction materials attracts researchers worldwide owing to the high pessimistic environmental impact of the nickel ore processing industry. It has mild and hard properties which are suitable for the fabrication of paving blocks. This study presents optimization NSW mixed with stone ash for the practical manufacture of concrete paving blocks (CPB). It was prepared in a small aggregate by using disk mill process, then printed by using a mold size of 1200 cm3 with each variation of the composition. Based on these results, we discover the different compressive strength (CS) from CPB which is compared with the Indonesian standard (SNI). Sample D has excellently fabricated with a composition ratio of 1:1:1:1. It is evident from the results of testing CS and water absorption (WA) with a value of 385.00 Kg/cm2 and 4.58%, respectively; both values indicate an appropriate product for the city roads. Meanwhile, sample A represents a standard method that is usually applicable for the sidewalk, and samples B and C also have high durability representing the usage for parking areas.