LOW CARBON CONCRETE: CEMENT REPLACEMENT UTILIZING FLY ASH

Reducing the cement content in concrete is need for environmental sustainability, as produces a significant carbon emission. This work aims to study effect of partial replacement utilizing fly ash at various percentage substitution by investigating physical characteristic ingredients, compressive testing curing age, workability, and material cost reduction. Fly used this research categorized type F, which obtained from Jepara powerplant. Along with ash, ordinary pozzolan (OPC) Semen Gresik binder material. The fine coarse aggregates quarried consecutively Magelang Regency Kulon Progo Regency, Indonesia. All constitutes being observed on specific gravity, gradation test, clay lumps content, abrasion resistance. job mix formula developed adopting Indonesian Standard based data previously, resulting five levels 0%, 15%,20%, 25%, 30% compared cementitious weight. Concrete cylinder specimen having 150 mm diameter length 300 mm, tested age (7,14, 28 days) strength development during age. current works remarks that all level good agreement targeted (25 MPa) 14 days. However, more supplemented mixture, possesses slower rate slight declining workability. Eventhough slump value still comply requirement given Standard.