**9. Conclusion**

RRP235special is an acidic additive that makes a situation in which colloid surface energy changes, and consequently, water is released, and using the physical process, permanent compaction is created. The result of lab and field experiments indicated improvement of stabilized clayey soil properties.


changes to the soil, whereas cement and lime give their own properties to the soil. RRP-stabilized soil properties depend on the chemical–physical process, so there is no limitation to compaction energy. According to the manufacturer's statement, the additive makes colloids hydrophobic, creating a waterproof layer and consequently preventing capillarity.

