USING OF PORTLAND CEMENT FOR THE SOIL STABILIZATION IN THE BUKIT RAWI VILLAGE, SUBDISTRICT CENTRAL KAHAYAN PULANG PISAU REGENCY

Abstract

The soil stabilization was an attempt to change or improve the engineering properties of soil in order to qualify
certain technical necessary. The engineering properties of soil which supports the carrying capacity were that
strong value of the soil bearing (CBR) and free compressive strength (UCS). The soil of Bukit Rawi village, Central
Kahayan subdistrict Pulang Pisau regency, as mentioned in the earlier study had a low ground bearing capacity.
The problems of this is because of condition of fine soil grains being dominant and easily influenced by water
which has lead directly to its strong values of soil bearing (CBR) of the existing soil. For that, soil stabilization
will be performed using portland cement. It is expected to improve the strong value of the soil bearing (CBR)
and free compressive strength (UCS). In this study, the portland cement of Gresik brand is used as an additive
ingredient of soil stabilization, which is applied in this study were 0%, 5%, 10%, 15%, 20%, 25% and 30%. The
test was consisting of the physical soil properties which were bleded for testing moisture content, density,
grained size distribution, the limits of atterberg, compaction, strong bearing capacity (CBR), and strenght free
press (UCS). Those were done during on a one day in laboratory of the Building Technical Education and Study
Program The Faculty of Teacher Training and Education at under The University of Palangka Raya. The results
showed that the highest soil stabilization was on portland cement mix to 25% by 35.00%, with the strength
support of land value (CBR) increased by 28.75% from the original 6.25%, while the value of the compressive
strength of the free (UCS) on 20% of portland cement mixture of 1,200 kg/cm2 to free the compressive strength
(UCS) fell by 0.360 kg/cm2, from its original condition 0.840 kg/cm2. Strenght value of soil bearing (CBR) was
optimum mixture of portland cement with land of 35.00% by Bowles (1992) in Hardiyatmo (2012) optimom
mixture of 25% that this land including the strength support of land (CBR) 20% - 50% is recommened to be used
as subbase layer or subgrade, with the good results.