This paper presents the potential of utilizing used cooking oil as a foaming agent in the production of lightweight concrete. This morphology study is to observe the development of Fuscof as foam agent in lightweight greencrete after ambient curing process. Foam formulated was produced derived by utilization the waste of used cooking oil. The mortar phase of FUSCOF lightweight greencrete was formed. Then, the material morphology of the lightweight greencrete was analysis by using FESEM. The morphology of FUSCOF greecrete was then compared with a lightweight foam produced from commercial synthetic foam agent. The water cement ration has been determined for this mix design is 0.6. The density of FUSCOF lightweight greencrete was 1200. The age of the ambient curing process was varied between ±30-day and ±60-day. The maturation of the mortar was observed. As a result, the major element was Calcium, Ca has been detected by EDAX.

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