Study of Mechanical Properties of Old Wood Materials Case Study : Phatthayakosol House

Abstract

The article titled “Study of Mechanical Properties of Old Wood Materials” is part of the thesis titled “The Test of Old Wood Materials for New Building Construction, Case study : Phatthayakosol House”. The objective of this project was to study the selection methods in using old wood materials by carpenters. We also tested the old wood materials about the compression for various types of wood materials.
The test of the mechanical properties of old and new wood materials according to the type of wood from this building consisted of the wood materials screening methods from the wisdom of carpenters by using the preliminary methods. Moreover, the test was carried out after such materials were screened by the carpenters. We tested the mechanical properties of old wood materials by using the standards in testing the wood materials to search for the mechanical properties including the compression of the wood materials which was perpendicular to the wood grain and the compression of the wood materials which was parallel to the wood grain. Wood materials which were used for the test were the building structure that need to keep up with the highest compression.
For the first procedure in our research, we have selected the pieces of work that were screened by carpenters. There were 2 categories including the non-recyclable and recyclable ones. Then, we have selected the pieces of work according to the standard for testing. We have categorized the wood materials into 3 groups. Each group consisted of 3 pieces of work in order to test the mechanical properties for 1 force by using the Universal Testing Machine. After testing the proportional limit of the wood materials, we recorded and took photos when the testing was completed. Then, we used all of the testing results for identifying the compression.
From the test, we found that screening by the carpenters in order to test the compression of the wood materials which was perpendicular to the wood grain. The average mechanical properties of Rosewood were 13083 Load (kgf), Shorea was 9188 Load (kgf) and Teak was 4121 Load (kgf). For non-recyclable wood materials, the average mechanical properties of Rosewood were 9254 Load (kgf), Shorea was 1816 Load (kgf) and Teak was 5722 Load (kgf). But we found that there was 1 piece of Teak with the average mechanical properties of 10193 Load (kgf). This piece of Teak can be used again. For the test about the compression of wood materials which was perpendicular to the wood grain, the average mechanical properties of Rosewood was 13707 Load (kgf), Shorea was 18618 Load (kgf) and Teak was 14065 Load (kgf). For the non-recyclable wood materials, the average mechanical properties of Rosewood was 9824 Load (kgf), Shorea was 5707 Load (kgf) and Teak was 9726 Load (kgf). Therefore, we can identify that the wood materials which were screened by the carpenters, were reliable.