Design Mix Optimization of Heavy Weight Concrete Coating Proscess at PT XYZ By Box-Behnken Design Experiment

Harianto, Siens (2017) Design Mix Optimization of Heavy Weight Concrete Coating Proscess at PT XYZ By Box-Behnken Design Experiment. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

The annual production of heavy concrete in PT XYZ is about 75,000 upto 100,000 metric tons which consist of approximately 83% heavy aggregate (i.e. iron ore), 12% portland cement, and 5% water. To improve the competitive advantage of the company, PT XYZ intends to modify the existing design mix by adding certain amount of medium density material (e.g. crushed stone) in to the mixture while reducing the amount of the heavy aggregates and maintaining its CTQ characteristics. The CTQ characteristics of the product are compressive strength and density. The density of the product depends on the individual density and the proportion of the aggregates in the mixture, while the compressive strength depends mostly on the water to cement ratio. Based on the results obtained from this research it is concluded that the optimum proportion (by volume) of the new design mix are 0,071 (water), 0,097 (cement), 0,357 crushed stone, and 0,475 (coarse iron ore) for density minimum of 3040 kgs/m3 and minimum compressive strength 40 MPa. The new design mix will potentially save 19% of the material cost compared to the old design mix.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Concrete Weight Coating, Heavy Concrete, CWC, heavy aggregate, Box-behnken
Subjects: T Technology > TS Manufactures > TS156 Quality Control. QFD
T Technology > TS Manufactures > TS167 Costs, Industrial
Divisions: Magister Management Technology
Depositing User: Siens Harianto
Date Deposited: 22 Nov 2017 02:10
Last Modified: 08 Mar 2019 03:33
URI: http://repository.its.ac.id/id/eprint/45362

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