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This Study is intending to provide an understanding on the influence of recycled aggregate on strength of mortar with different water cement-ratio; the use recycled aggregate can reduce the strength of mortar up to a certain percentage, which can lead to a reduction of up to 40% in compressive strength and bending strength. To reduce the usage of Natural aggregate, the recycled aggregate can be used as replacement material. In this study, water cement-ratio is adjusted three times to observe the influence it has on the strength of recycled mortar. The rate of recycled aggregate that been used to replace the natural aggregate (the river sand) was 0%, 10%, 20%, 30%, and 40% with different water cement-ratio of 0.5, 0.55 and 0.6. Also the rate of fly ash that has been used to replace the cement to make the recycled mortar was 10%, 20%, 30%, and 40% with different water cement ratio of 0.5, 0.55 and 0.6. Fly ash is also used in the mixtures in moderation as a replacement for cement. In this study, the experiment tested out the bending strengths and the compressive strengths of various specimens over certain duration of days.
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