| dc.description.abstract | Clay soil is a type of soil that is not suitable for use in construction work because it causes cracks
or bumps on the road and lifts the foundation. This is because clay has a weak bearing capacity,
is cohesive, has a high index of plasticity and shrinkage. The purpose of this study was to
determine the effect of adding gypsum waste to the CBR value and the swelling value of the soil
in Mulusan Village, Paliyan, Gunung Kidul. The research carried out is testing the physical
properties of the soil, unsoaked CBR testing with 0, 3, and 7 days of ripening and saoked curing
period of 7 days and 4 days of immersion with variations of gypsum waste 0%, 3%, 6% and 10%
and Swelling Test. . The results showed that the soil included in the OH classification according
to USCS, namely clay soil of medium to high plasticity, while according to AASHTO it was
classified as A-7-5, namely medium to poor subgrade. Based on the original soil CBR test, the
Unsoaked CBR value was 5.65% and the Soaked CBR was 1.02%. The highest increase in the
Unsoaked CBR value occurred in the addition of 10% gypsum waste variation with a 3 day curing
period of 44.8% and in soaked CBR the addition of 10% gypsum waste variation of 57.8%. The
original soil swelling value was 5.23% and the smallest swelling value was 2.18% with the
addition of 10% gypsum waste variation. | en_US |
