This research, researchers have studied the approval of materials used in construction projects, rail, red line. Range-Sue-Rangsit to bring research to use in planning, construction management, construction projects, rail, the most efficient. In this research study approved materials, civil and architectural materials only. The results showed that during the period of 18 months from the start the project with a total of 510 approval all material, bills of material, civil engineering is likely to be approved than architectural materials. Without the work of soil material is material that has the highest approval rate. The material, 62.5 percent were approved, most material structure and Foundation 80.20 percent of all approved materials. Architectural materials have a chance and then approve a conditional approval over material civil without approval of the terms most frequently encountered include lack of appearances, visit the plant materials, and the materials that will be used must be tested by the Institute or in Korea.Athue. Architectural material and must be submitted for approval to have a chance to examine it again, rather than the cause of civil engineering material by the main contractor want to send the document, check again: Details of the document submitted is not complete. Materials in civil engineering work and architectural materials have the opportunity to ask for approval, and then hit reject. Why the contractor approval has already been charged with material declines in the civil engineering and architecture are: The result of the test material does not meet approval.
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