<![CDATA[Mortar is a mixture of water, fine aggregate, portland cement or other hydraulic adhesive materials, and other additives that improve the quality of mortar. Ground surfaces such as sidewalks, yards, parking, and light paving are covered by block paving. The purpose of this study was to find out how the replacement of sand affects the quality of compressive strength of mortar to be mixed with boiler scale ash. Experiments were conducted at the Civil Engineering Laboratory of Asahan University to use a composition of replacing sand containing boiler scale ash as much as ten, thirty, and fifty per cent of the weight of sand. As a sample, a standard hexagon paving block test specimen with a thickness of 8 cm is used. Nine samples total, three for each variation and three for each variation. After receiving treatment before testing, the sample was tested at 28 days of age. According to the study, the mixture of sand replacement mortar with 50% boiler scale ash has the highest compressive strength of 12.78 MPa at 28 days of concrete life, while the mortar mixture with 10% boiler scale ash has the lowest compressive strength of 8.15 MPa.Keywords mortar, boiler scale ash, compressive strength, paving block]]>
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