Analysis of Sand Material Selection for Making Concrete at Ready-Mixed Concrete Suppliers in Lombok Island

Farida Fasa, Hariyadi Hariyadi, Ngudiyono Ngudiyono

Abstract


Lombok Island is experiencing an increase in demand for construction materials in line with the development of national strategic projects. One of the main materials in ready-mix concrete production is sand, the quality of which significantly affects the quality of the concrete. This study aims to analyze the weighting of criteria and sub-criteria and determine the best sand alternative. The method used combines the Analytical Network Process (ANP) to determine the importance of criteria and sub-criteria, and the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) to determine the ranking of mining alternatives. The results are then adjusted for laboratory testing. The results of the criteria weighting using the ANP method show that the mining permit carries the highest weighting at 45%, followed by quality (44%), price (5.1%), and delivery (5%). Meanwhile, for the sub-criteria weighting, mining legality (IUP) is the most dominant with a weighting of 39%, followed by mud content at 31%. Based on the TOPSIS method, sand from the Aikmel mine ranks highest, followed by Korleko, Kalijaga, Aik Dalem, and Pengadangan. Meanwhile, the Tampes mine ranks last. These results are consistent with laboratory testing, where the Aikmel area demonstrated mud content, gradation, and specific gravity that met standards, while the Tampes area failed to meet the required technical criteria. However, there are discrepancies between the TOPSIS ranking results and laboratory testing results at the other three mines, indicating other factors such as legality and price. The results are expected to serve as a practical reference for the construction industry in improving concrete quality and material selection efficiency.

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References


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