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ECC mortar is a new type of composite based on engineering materials. It is the special properties that ECC possesses that distinguish it from traditional concrete materials, such as high ductility and micro-cracking behavior. The constituent materials of ECC mortar consist of water, sand, cement, fiber, and several chemical additives. Gravel or coarse aggregate is not used. To support environmentally friendly ECC mortar, fly ash waste is used as cementitious material. This study aims to compare the compressive strength value of normal mortar with ECC mortar with the addition of High Volume Fly Ash (HVFA). The study was conducted from December 2022 to January 2023, with an experimental method to determine the effect of adding fly ash as an added ingredient in the ECC mortar mixture. The variation in the percentage of fly ash used is 45%, 50%, 55%, and 60% of the overall weight of cement with the number of specimens for each variation as many as 2 pieces. Compressive strength tests were carried out after a treatment period of 14 days and 28 days using a cube specimen measuring 15cm x 15cm. Based on the results of the analysis, the optimum compressive strength value was produced by a sample of 2b-45% at a treatment age of 28 days, which was 20.5 MPa with a percentage increase of 21.3% from normal mortar. The more percentage of fly ash used causes the compressive strength value obtained to decrease.
Keywords: fly ash, compressive strength, ECC mortar.
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