Coal combustion generates a large amount of coal ash. The by-products produced by the coal-fired power plant including fly ash, bottom ash, boiler slag, and flue gas desulfurization material. Coal fly ash (CFA) and coal bottom ash (CBA) are the major solid waste of coal combustion. The management of these solid waste is a big challenge to the power plant as well as local authorities. Prior to utilizing the coal ash as pavement base material, it was necessary to understand the relationship between mixture mechanical property to its structural design parameter used in the pavement design and analysis. However, no study has investigated the mechanical behavior of the 100% coal ash cement stabilized material (CACSM) as pavement base layer. Therefore, the objective of this study was to investigate the structural layer coefficient of CACSM used in the AASHTO 1993 pavement design guide. The study consisted of laboratory materials characterization and field performance evaluation. The CACSM mixes have changed the length and width of the crack when the examination at 7-days, continued to the 28-days some of the thin cracks almost sealed, CTB mix showed has not changed during the time period observation in visual observation. It appears that coal ash significantly influences the secondary curing of the specimens as proved in mechanical observation of self-healing. The layer coefficient from each location in the field section showed that range 0.22 – 0.24 compare to another base layer from another research was only 0.07 – 0.14 of granular base and 0.17 – 0.20 of CTB.

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