Experimental Study of Natural Materials Utilization as a Stabilization Agent on Soft Soil

Abstract

Chemical soil stabilization is known as the most economical method compared to others. The development of stabilization materials has led to studies of the utilization of natural materials and waste materials to replace cement and lime which has become the most popular binder agent ever known. This research utilizes natural minerals such as overboulder, zeolite and Palm Oil Fuel Ash (POFA) as its binder agents. The amount of natural material varies at intervals 3% - 15% by the weight of soil. Additional of natural materials is done to increase bearing capacity as a subbase layer, which is based on FHWA standards CBR minimum is 20%. California Bearing Ratio (CBR) tests were carried out to see the effect of each material for increase bearing capacity of soft soil. Curing periode is varies at 7 days, 14 days and 28 days. The results shows, by adding natural minerals such as overboulder, zeolite, and POFA increasing the CBR value up to 5 times, 6 times and 5 times compared to untreated soil and close to the CBR value of cement stabilized soil. Referring to FHWA standards, we can conclude that natural materials can be used for stabilization materials on subbase layer.

Behavior of Physical and Density Properties of Soft Soil Stabilized With Nickel Slag

“…The ASTM 593-82 standard classifies pozzolanic materials based on their source, namely: (a) natural pozzolan is a material derived from volcanic materials containing active silica, such as: trass, pumice, perlite, and (b) artificial pozzolan which is a material derived from combustion products, such as: fly ash, sediment ash, slag, etc. Soil stabilization engineering that utilizes pozzolan has been widely done, such as: utilization of natural pozzolan in the form of trass Komang et al (2022), in the form of overboulder and zeolite Harianto et al (2020). Furthermore, the utilization of artificial pozzolan has been presented by several researches, such as: the utilization of button asphalt waste Rauf et al ( 2020), the use of coal bottom ash Navagire et al (2022).…”