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In Vietnam, the larger amount of municipal solid waste (MSW) is generated but the main treatment method still is landfilling. Currently, the incinerator is applied for MSW treatment. Previous researches showed that MSW bottom ash (MSWIBA) can be used as construction material such as roadbed and foundation layers. The direct shear test results showed that the friction angle of MSWIBA was from 38° to 55°, which was suitable for construction materials. However, in Vietnam, there is limited research about the mechanical properties of MSWIBA. Thus, this paper focuses on the effect of compaction ratio on the shear strength of MSWIBA by using large direct shear with a diameter of 300 mmx300 mm. The results showed that the internal friction angle for MSWIBA was about 31° and 44° for compaction ratio of 90 percent and 95 percent, respectively. In addition, cohesion was also quite high for two cases.

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