Analisis Cacat Produk Tiang Pancang Menggunakan Seven Tools Pada PT XYZ

Don Arges Panjaitan; Surya Sukmaharto Putra

doi:10.33506/mt.v12i2.5605

Authors

Don Arges Panjaitan Universitas singaperbangsa karawang
Surya Sukmaharto Putra Universitas Singaperbangsa Karawang

DOI:

https://doi.org/10.33506/mt.v12i2.5605

Keywords:

Honeycomb, Precast concrete, Quality control, Seven Tools, Surface cracks

Abstract

This study aims to analyze defects in precast concrete pile products at PT XYZ, Karawang, West Java, and to identify the dominant defect types and their root causes. The research data consisted of production and quality control reports for March 2025 with a total production of 740 units. A total of 25 defective units were identified, consisting of 16 surface crack defects (64%), 7 honeycomb defects (28%), and 2-dimensional mismatch defects (8%). The analysis was conducted using the Seven Tools for Quality Control, namely check sheet, Pareto chart, fishbone diagram, histogram, scatter diagram, control chart, and stratification. The results indicate that surface cracks should become the main improvement priority because they contributed the largest proportion of defects. The main root causes were related to non-homogeneous concrete mixtures, overly dry mixtures, suboptimal curing processes, inadequate compaction, and shifted mold positions. The control chart indicates that the process remained within statistical control limits, although process variation still needs to be reduced. This study recommends standardizing the mixing process, controlling water content, strengthening curing procedures, inspecting molds, and improving compaction supervision to reduce product defects.

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