Road connectivity is one of the key components for development, as it promotes access torneconomic and social services, generating increased income and employment. However, thernconstruction of such economically vital sector is the most expensive of public works projectrnundertaken by the society. Traditional pavement design and construction practices requirernhigh quality materials to fulfil minimum construction standards. In many of road projects it isrnvery difficult to get standard materials with in economical haul distances.rnThere is an increasing effort around the world towards introducing innovative andrnunconventional road construction approaches that aim at reducing costs of construction byrnenabling use of marginal materials found with in the road route. One of proven technologiesrnin connection to this effort is stabilization of soil. Stabilization can be derived from thermal,rnelectrical, mechanical or chemical means. Chemical stabilizers can generally be categorizedrnin to two broad categories: conventional and unconventional stabilizers. Traditionalrnstabilizers such as cement lime, fly ash, and bituminous products have been intenselyrnresearched, and their fundamental stabilization mechanisms have been identified.rnUnconventional soil stabilization additives consist of a variety of chemical agents that arerndiverse in their composition and in the way they interact with the soil. Unfortunately,rnrelatively little is known about their interaction with geotechnical materials or theirrnfundamental stabilization mechanisms due to proprietary nature of commercial stabilizationrnadditives, their exact chemical compositions are not disclosed.rnIn this research two unconventional stabilizers were used for investigation of their effect onrnthe engineering properties of soils that are deemed to be marginal for road subbase andrnsubgrade. The two stabilizers used were: PURE CRETE and Anyway Natural Soil Stabilizerrn(ANSS). ANSS Natural Soil Stabilizer is claimed to be inorganic, hydration activated powderbasedrnstabilizer that reacts with the soil particles to create layers that are interconnectedrnthrough a complex inter-particle framework. The manufacturer claims PURE CRETE to be arncomplex non-bacterial concentrated multi-enzymatic formulation that alters the propertiesrnof earth materials, providing one of the most cost effective methods to stabilize roads andrnseal ponds and landfills.rnThe stabilizers were combined with a total of five different soils with classificationsrnaccording to AASHTO as A-7-5, A-7-6, A-2-7, A-2-4, and A-2-6. ANSS stabilization inducedrnthe most improvement on engineering properties of all soils tested at manufacturerrnrecommended dosages and PURE CRETE failed to show any improvement at manufacturerrnrecommended application rate. However, at very high application rates modest effects werernnoticed.rnIt is recommended based on the results of this research that ANSS can be considered as arnviable option for stabilization of subgrade soils after conducting durability tests. It willrnparticularly help use of marginal materials where materials that met standard specificationsrnare far away.