Lalombi Tropical Peat Soil Improvement Using Iron Oxide admixture and Cement

Abstract Peat soil has a relatively high water content of up to 400%. With moisture content, peat can hinder construction work. For this reason, in planning, an investigation must be carried out on the characteristics and strength soil, especially properties that affect bearing capacity withstand load it. This study aimed determine changes after mixing with cement iron oxide admixture. The variation is 0%, 4%, 8%, 16%, while for mixture 5%. research was conducted including testing physical mechanical properties. Engineering tests include direct shear consolidation tests. elemental chemical SEM (Scanning Electron Microscope) test. Based classification at location ash content-value 29.41%, it classified as High Ash (peat > 25%). In test, cohesion value angle continued increase percentage increased where changed from 7.60º 45°. original Cc 0.00820 decreased addition 16%; 0.00277. decrease indicates becomes easily compacted, Coefficient Consolidation (Cv) 0.00535 cm²/sec. most significant 16% 0.01463 Chemical results have been given 5% cement, change C (Carbon), Fe (Ferrum) Ca (Calcium). O (Oxygen) 48.05% then 43.67%, pores are reduced, when denser. Si (Silica) also 30.01% 21.21%. occurred because silica reacted lime. After all, adhesive binds lime, making granules soil’s 3.12%, 16.72%. helped become stronger higher specific gravity iron. Al (aluminium) 12.15% being 12.16%.