Eligibility of nickel slag waste combined with stone ash for manufacturing paving block

Document Type : Regular Paper


1 Indonesia

2 Department of Environmental Engineering, Faculty of Engineering, Universitas Muhammadiyah Kendari, Kendari 93115 – Southeast Sulawesi, Indonesia

3 Faculty of Engineering, Universitas Halu Oleo, Kendari 93231 – Southeast Sulawesi, Indonesia.


The high production of nickel slag waste (NSW) from nickel ore processing has an impact on environmental damage because it is not utilized properly for solid waste products to make practical building materials that are safe and inexpensive. NSW also has mild and hard properties so that it can be used as a mixture for making paving blocks. Thus in this study, we tried to utilize NSW mixed with stone ash for the practical manufacture of concrete paving blocks (CPB). It was prepared in a small aggregate by using the disk-mill process, then printed by using a mold size of 1200 cm3 with each composition variation. Based on these results, we discover the different compressive strength (CS) from CPB. The CS test results for samples A, B, C, and D show that sample A with a weight of 2.701 Kg produces a CS of 19.77 MPa (201.665 Kg/cm2). Sample A as a comparison against samples B, C, and D. Based on data exhibited that samples B, C, and D with a weight of 2.916 Kg, 2.945 Kg, and 2.936 Kg were producing a CS of 31.46 MPa (320.83 Kg/cm2), 34.33 MPa (350 Kg/cm2), and 37.76 MPa (385 Kg/cm2), respectively. Sample D has excellently fabricated by testing CS and water absorption (WA) with a value of 37.76 MPa (385.00 Kg/cm2) and 4.58%, respectively.


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