Application of DMAIC for reducing concrete quantity variability in reinforced concrete structural work of single-detached house construction
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This research aims to improve the accuracy of concrete quantity estimation in reinforced concrete structural work of single-detached house construction by applying the DMAIC framework to analyze the causes of concrete quantity deviation. The study began with an analysis of construction cost data for a single-detached house with a usable area of 96 square meters. The results indicated that reinforced concrete structural work accounted for the highest proportion of total construction cost, representing 17.4% of the overall project cost. Therefore, this activity was selected as the target process for improvement. Improvement measures included the development of a standardized concrete quantity calculation form, the establishment of a checklist for reviewing construction drawings, the preparation of a work instruction for concrete quantity estimation, and the determination of an appropriate tolerance level for ordering concrete. The results showed that the deviation in concrete quantity decreased from 8.3% to 1.4%, while the concrete quantity deviation was reduced from 1.96 m³ to 0.33 m³. The findings indicate that the DMAIC-based improvement measures effectively reduced concrete quantity deviation and enhanced estimation accuracy in the case study project.
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