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All Journal LEADER: Civil Engineering and Architecture Journal
Hanifah Asnur
Program Studi Teknik Sipil, Sekolah Tinggi Teknologi Payakumbuh

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The Influence of Optimum Water Content (Wopt) and Maximum Dry Density (γd) on Laboratory CBR Values at Grand Madinah Regency Housing, Balai Gurun Koto Nan Gadang, Payakumbuh City Rivaldi Harianto; Hanifah Asnur; Sutria Desman
LEADER: Civil Engineering and Architecture Journal Vol. 3 No. 6 (2025): December
Publisher : Fakultas Teknik Sipil dan Perencanaan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/leader.v3i6.11972

Abstract

Soil is a fundamental element in road construction, serving as the subgrade layer that supports vehicular loads, therefore, its charateristics  particularly  moisture  content  and  soil compaction significantly affect bearing capacity, this study aims to analyze the effect of optimum moisture content and maximum dry density on the California Bearing Ratio (CBR) value obtained from laboratory test on soil from Grand Madinah Regency Housing area, Balai Gurun Koto Nan Gadang, Payakumbuh City. The theoretical foundation includes the concept of soil compaction based on the Standard Proctor Test and the CBR test as an indicator of subrage strength in pavement design. The research employed a quantitative experimental method, with soil samples collected directly from the field and tested at the Laboratory of Sekolah Tinggi Teknologi Payakumbuh using 10, 25, and 56 blows of compaction to analyze the relationship between moisture content, dry density, and CBR value. The results showed that the optimum moisture content was 38,08% and the maximum dry density was 0,73 gr/cm3. The laboratory CBR values obtained were 0,67%, 0,70%, and 0,72%, with a design CBR value of 0,69%. According to the CBR classification, the soil is categorized as very poor subrgrade, indicating that it is unsuitable as a subgrade layer without stabilization. In conclusion, an increase in moisture content reduces both density and CBR value, while optimal compaction significantly enhances the soil’s bearing capacity.
The Effect Of Straw Bagasse Dust Mixture On Improving The Density (Γd) Of Silt Soil In Jorong Indobaleh Timur, Mungo, Luak District, Lima Puluh Kota Regency Chitra Ikhwan Gani; Hanifah Asnur; Sutria Desman
LEADER: Civil Engineering and Architecture Journal Vol. 3 No. 6 (2025): December
Publisher : Fakultas Teknik Sipil dan Perencanaan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/leader.v3i6.11973

Abstract

Silt soil has low bearing capacity and is unstable, making it unsuitable as a foundation for construction without improvement efforts. One potential soil stabilization method is by untilizing rice husk ash, wich is an agricultural waste rich in silica and possesses pozzolanic properties. This study aims to determine how the addition of rice husk ash affect the density of silt soil in Jorong Indobaleh Timur, Luak District, Lima Puluh Kota Regency. The literature review refers to soil compaction theory, soil classification according to AASTHO and USCS, and  previous studies related to the utilization of local materials for soil stabilization. The research method employs an experimental approach in the laboratory of Sekolah Tinggi Teknologi Payakumbuh. Testing was conducted on original soil and soil mixtures with variations of rice husk ash at 2%, 4%, 6%, 8%, and 10% using the Standard Proctor test. The tested parameters included moisture content, maximum dry unit weight (γd max), and optimum moisture content. The result show that the original soil has a γd max of 1.07 gr/cc and an optimum moisture content of 32.55% The 4% rice husk ash mixture provides optimal results with a γd max of 1.13 gr/cc and an optimum moisture content of 34.33%, while additions beyond 4% do not significant improvement. In conclusion, the addition of 4% rice husk ash is most effective in increasing the density (γd) of silt soil, making it applicable as a local stabilization material for road construction ang light foundations.
Co-Authors Chitra Ikhwan Gani Rivaldi Harianto Sutria Desman