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A Sridharan - One of the best experts on this subject based on the ideXlab platform.

  • Use of Uniform and Inert Beads for the Determination of Shrinkage Limit of Fine Grained Soils
    Geotechnical and Geological Engineering, 2012
    Co-Authors: K. Prakash, A Sridharan
    Abstract:

    Shrinkage Limit is one of the important index properties determined in the laboratory, which has practical applications such as classification of soils based on their degree of expansivity and as a measure of volumetric stability of clayey soils in the field. The conventional method of its determination requires the use of mercury, which is a heath hazardous substance. This paper proposes and discusses the use of beads of an inert material having uniform grain size for the determination of volume of dry soil pat, which is required for calculating the Shrinkage Limit of the soil. The Shrinkage Limit values obtained from the use of uniform beads of an inert material compare very well with those obtained from the conventional mercury displacement method and are within the acceptable Limits.

  • Sand Replacement Method for Determination of Shrinkage Limit of Fine-Grained Soils
    Journal of Hazardous Toxic and Radioactive Waste, 2011
    Co-Authors: K. Prakash, H. K. Karthik, A Sridharan, C. Anand
    Abstract:

    Mercury is one of the many hazardous substances that has been recognized and banned by many natural codes of practice and governments. Because many laboratory works in research and practice require the use of mercury, safe alternative materials and procedures are being researched. One of the Atterberg Limits dealing with volume stability of soils in the field is the Shrinkage Limit. The conventional method followed by many national codes of practice involves the use of mercury to measure the volume of dry soil pat. This paper proposes sand replacement method to determine the Shrinkage Limit of soils in the laboratory. This method uses sand of uniform gradation to determine the volume of dry soil pat. The proposed method is simple, safe, free from the Limitations of the conventional mercury and wax methods, and eco-friendly. The Shrinkage Limit values obtained from the proposed sand replacement method compare very well with those from the mercury displacement method.

  • determination of Shrinkage Limit of fine grained soils by wax method
    Geotechnical Testing Journal, 2009
    Co-Authors: K. Prakash, A Sridharan, Ananth J Baba, H K Thejas
    Abstract:

    Shrinkage Limit of fine-grained soils is one of the parameters that is used for predicting the volume stability of soils in the field. ASTM Standard D427-04 (2007) involves the use of mercury, a health hazardous substance. Many stringent precautionary safety and disposal measures have to be exercised before its use in the laboratory. The present technical note presents the wax method of determining the Shrinkage Limit of soil in the laboratory which does not require the use of mercury, and also to substantiate the method proposed by the ASTM standard. It involves the use of wax as a coating on the dry soil pat and the water displacement method for the determination of the dry volume of soil pat. The experimental results have shown that the values of Shrinkage Limit of soils determined by the wax method and by the mercury displacement method are within certain statistical bounds.

  • Shrinkage Limit of soil mixtures
    Geotechnical Testing Journal, 2000
    Co-Authors: A Sridharan, K. Prakash
    Abstract:

    Shrinkage Limit, one of the Atterberg Limits, is widely linked with many plasticity-based soil behaviors. However, in a great majority of these cases, such correlations have been found to exhibit poor performance. Recently, it has been brought out that the Shrinkage Limit of a natural soil does not depend upon plasticity characteristics, and it is primarily governed by the relative grain size distribution of the soil. The present study confirms this mechanism with the results obtained using clay-clay, clay-non-cohesive soil, and non-cohesive soil mix systems. The present study gains importance from the point of view of criteria with respect to the design of back fill materials to be used in various applications, such as nuclear waste disposal projects.

  • role of amount and type of clay in the lime stabilization of soils
    Proceedings of the Institution of Civil Engineers - Ground Improvement, 2000
    Co-Authors: P. V. Sivapullaiah, A Sridharan, K Bhaskar V Raju
    Abstract:

    The effect of quantity of lime and duration of curing on the basic properties of a black cotton soil has been studied in this paper. The optimum lime content was found to be 6%. To investigate the role of clay content, black cotton soil containing different amounts of clay size fractions was also cured with 6% lime and the properties studied. To study the effect of type of clay mineral, commercially available kaolinite has also been mixed with 6% lime and the properties studied. Immediately on addition of lime, the liquid Limit of black cotton soil decreases, but it increases with increase in duration of curing for any percentage of lime. These changes have been explained by changes in the thickness of the diffuse double layer and associated fabric changes. Studies on the changes in the properties of plastic Limit, Shrinkage Limit and free swell index on lime addition help us to understand the controlling mechanisms. The effect of the double layer increases for montmorillonitic soils with increasing clay ...

K. Prakash - One of the best experts on this subject based on the ideXlab platform.

  • Use of Uniform and Inert Beads for the Determination of Shrinkage Limit of Fine Grained Soils
    Geotechnical and Geological Engineering, 2012
    Co-Authors: K. Prakash, A Sridharan
    Abstract:

    Shrinkage Limit is one of the important index properties determined in the laboratory, which has practical applications such as classification of soils based on their degree of expansivity and as a measure of volumetric stability of clayey soils in the field. The conventional method of its determination requires the use of mercury, which is a heath hazardous substance. This paper proposes and discusses the use of beads of an inert material having uniform grain size for the determination of volume of dry soil pat, which is required for calculating the Shrinkage Limit of the soil. The Shrinkage Limit values obtained from the use of uniform beads of an inert material compare very well with those obtained from the conventional mercury displacement method and are within the acceptable Limits.

  • Sand Replacement Method for Determination of Shrinkage Limit of Fine-Grained Soils
    Journal of Hazardous Toxic and Radioactive Waste, 2011
    Co-Authors: K. Prakash, H. K. Karthik, A Sridharan, C. Anand
    Abstract:

    Mercury is one of the many hazardous substances that has been recognized and banned by many natural codes of practice and governments. Because many laboratory works in research and practice require the use of mercury, safe alternative materials and procedures are being researched. One of the Atterberg Limits dealing with volume stability of soils in the field is the Shrinkage Limit. The conventional method followed by many national codes of practice involves the use of mercury to measure the volume of dry soil pat. This paper proposes sand replacement method to determine the Shrinkage Limit of soils in the laboratory. This method uses sand of uniform gradation to determine the volume of dry soil pat. The proposed method is simple, safe, free from the Limitations of the conventional mercury and wax methods, and eco-friendly. The Shrinkage Limit values obtained from the proposed sand replacement method compare very well with those from the mercury displacement method.

  • determination of Shrinkage Limit of fine grained soils by wax method
    Geotechnical Testing Journal, 2009
    Co-Authors: K. Prakash, A Sridharan, Ananth J Baba, H K Thejas
    Abstract:

    Shrinkage Limit of fine-grained soils is one of the parameters that is used for predicting the volume stability of soils in the field. ASTM Standard D427-04 (2007) involves the use of mercury, a health hazardous substance. Many stringent precautionary safety and disposal measures have to be exercised before its use in the laboratory. The present technical note presents the wax method of determining the Shrinkage Limit of soil in the laboratory which does not require the use of mercury, and also to substantiate the method proposed by the ASTM standard. It involves the use of wax as a coating on the dry soil pat and the water displacement method for the determination of the dry volume of soil pat. The experimental results have shown that the values of Shrinkage Limit of soils determined by the wax method and by the mercury displacement method are within certain statistical bounds.

  • Shrinkage Limit of soil mixtures
    Geotechnical Testing Journal, 2000
    Co-Authors: A Sridharan, K. Prakash
    Abstract:

    Shrinkage Limit, one of the Atterberg Limits, is widely linked with many plasticity-based soil behaviors. However, in a great majority of these cases, such correlations have been found to exhibit poor performance. Recently, it has been brought out that the Shrinkage Limit of a natural soil does not depend upon plasticity characteristics, and it is primarily governed by the relative grain size distribution of the soil. The present study confirms this mechanism with the results obtained using clay-clay, clay-non-cohesive soil, and non-cohesive soil mix systems. The present study gains importance from the point of view of criteria with respect to the design of back fill materials to be used in various applications, such as nuclear waste disposal projects.

  • mechanism controlling the Shrinkage Limit of soils
    Geotechnical Testing Journal, 1998
    Co-Authors: A Sridharan, K. Prakash
    Abstract:

    Based on the results from an extensive experimental program involving a number of natural soils as well as pure clays with extreme clay mineral types, namely kaolinite and montmorillonite, as the principal clay minerals, a hypothesis explaining the mechanisms controlling the Shrinkage Limit has been proposed. The Shrinkage Limit of a natural soil has been shown to be primarily a result of the packing phenomenon, which in turn is governed by the grain-size distribution of the soil; the Shrinkage Limit of pure clays appears to be affected by the fabric also. Even though clay-sized particles play an important role in the Shrinkage phenomenon, there is an optimum clay content at which the Shrinkage Limit of a soil can become minimum. It has been further illustrated that the Shrinkage Limit is not at all related to the plasticity characteristics of the soil. As the factors governing the Shrinkage Limit are entirely different from those controlling the swelling of soils, the Shrinkage Limit cannot indicate the swelling behavior of the soil.

-, Ir. Renaningsih M.t. - One of the best experts on this subject based on the ideXlab platform.

  • Kuat Tekan Bebas Tanah Lempung Sukodono Sragen yang Distabilisasi dengan Kapur dan Bubuk Arang Tempurung Kelapa
    2019
    Co-Authors: Ikhsan Muhamad, -, Ir. Renaningsih M.t.
    Abstract:

    Land is the basis of a structure or construction, be it building construction or road construction, which often creates problems if it has bad properties. The land in Bendo Village, Sukodono District, Kabuaten, Sragen, is a clay soil that has high Shrinkage and plasticity. So it needs to be improved by stabilizing the soil using the addition of 5% lime and coconut shell charcoal powder presentations 0%, 2.5%, 5%, 7.5% and 10% of the weight of the soil sample. This study was conducted to determine the effect of the addition of lime and coconut shell charcoal powder on physical and mechanical properties of the free compressive strength parameters. The results of physical properties test of native soil stabilized with lime with a fixed percentage of 5% and coconut shell charcoal powder with the percentage of 0%, 2.5%, 5%, 7.5%, 10% tend to decrease for the value of water content, specific gravity (Gs), Limit liquid (LL), Plasticity Index (PI), pass filter No. 200 whereas in the Shrinkage Limit (SL), the plastic Limit (PL) has increased. According to the AASHTO method, soils are included in the A-7-5 classification with the type of material which is generally clay soil and general assessment as a basic soil that is moderate to bad. In the classification using the USCS method, soils are included in the MH group which means inorganic clay soils with high plasticity. The results of the mechanical properties of the standard Proctor soil test mixture of 5% lime and coconut shell charcoal powder presentations 0%, 2.5%, 5%, 7.5% and 10% experienced an increase in volume weight value and a decrease in optimum water content. The lowest value of free compressive strength is found in the original soil with a value of 0.260 kg / cm2 while the largest value of free compressive strength is in the soil with a mixture of 5% lime and 10% coconut shell charcoal powder that is equal to 1,780 kg / cm2 which is included in the state of the springy clay

  • Pemanfaatan Abu Sekam Padi dan Gipsum Sebagai Bahan Stabilisasi Tanah di Bayat Klaten Terhadap Penurunan Konsolidasi
    2018
    Co-Authors: Nugroho, Setya Adi, -, Ir. Renaningsih M.t.
    Abstract:

    Based on the research results (Mehikawati, 2010) Bayat land, Klaten has a value of w = 87.5%, Gs = 2.625, LL = 77.25%, PL = 50%, SL = 16.026%, PI = 27.25% distribution of granules are: gravel = 0%, sand = 26.67%, clay = 73.33%. is a clay soil (MH or OH) and belongs to groups A-7-5 (25) which means including clay soil with medium to high plasticity, it is necessary to refine. In this study, the improvement was done by giving gypsum addition and rice husk ash variation 0%, 2.5%, 5%, 7,5%, and 10% from sample weight. Test methods include physical properties test, Proctor standard test and consolidation test on native soil and mixed soil. The result of physical properties test showed that the increasing percentage of rice husk ash and 5% gypsum value, plastic Limit, Shrinkage Limit, increasing, while water content, specific gravity, liquid Limit, plasticity index and pass filter. 200 is declining. Proctor standard test results obtained the weight value of the maximum dry volume increased and the value of the optimum water content decreased with the addition of rice husk ash and 5% gypsum. The maximum dry weight volume value was 1.61 gr / cm3 and the lowest optimum moisture content was 17% in mixed soil with the addition of 5% gypsum and 10% rice husk ash. The result of consolidation test shows that the increasing percentage of mixed coefficient (Cv) adds, while the value for index value (Cc) and decreasing of consolidation (Sc) decreases. Original ground Cv value of 0,00413 cm2 / s, Cc value equal to 0,5036 and Sc value equal to 0,1069cm. The highest Cv value is 0,00475 cm2 / s, the lowest Cc nilsai 0,3425 and the lowest Sc score 0,0830 cm obtained in mixed soil with percentage of 5% gypsum and 10% rice husk ash

Wulandari Sri - One of the best experts on this subject based on the ideXlab platform.

  • CLAYEY SOIL STABILIZATION USING RICE HUSK ASH AND LIME EVALUATED BY CBR UNSOAKED
    Direktorat Bina Teknik Jalan dan Jembatan, 2020
    Co-Authors: Sajati, Anis Fajar, Wulandari Sri
    Abstract:

    Salah satu kekuatan atau kekokohan suatu konstruksi ditentukan oleh kualitas bahan dasar yang dipergunakan. Seperti pada konstruksi jalan, sebagai bahan dasar (subgrade) juga sangat menentukan kekuatan jalan. Kualitas tanah asli pada daerah Hambalang kecamatan Citeureup, Bogor mempunyai daya dukung (kepadatan kering, CBR) rendah 1,9%, sehingga dapat menyebabkan konstruksi jalan akan cepat mengalami kerusakan. Stabilisasi tanah yang dilakukan pada penelitian ini adalah stabilisasi dengan cara kimiawi dan bahan campuran yang dipilih adalah abu sekam padi (ASP) dan kapur (Lime). Pengujian ini di lakukan dengan tanah lempung dengan menambah campuran abu sekam dan kapur dalam variasi persentase berat lempung sebesar 0%, 4%, 8% dan 12% dari berat kering tanah, dengan pengujian CBR Unsoaked tanpa pemeraman. Perbandingan antara kapur dan abu sekam padi adalah 50% : 50% dan masing-masing campuran dibuat sebanyak 3 sampel. Kadar air pada tanah asli sebesar 7,52% menurun menjadi 49,50% pada variasi 12%. Nilai CBR tanah meningkat secara signifikan. CBR pada tanah asli sebesar 1,9% meningkat menjadi 8,0% pada campuran abu 2% dan kapur 2%, kemudian mengalami peningkatan pada campuran abu 4% dan kapur 4% yaitu 30,1%, dan pada campuran abu 6% dan kapur 6% mengalami penurunan menjadi 10,7%. Dapat disimpulkan bahwa pada percampuran 8% diperoleh nilai CBR sebesar 30,1%.Kata Kunci: Stabilisasi, jalan, tanah lempung, campuran, optimum, CBRThe quality of original soil in the Hambalang area of Citeureup - Bogor, virtualy shows low density mainly the unsoaked CBR value therefore unusable for subgrade stucture, and can cause road construction to be easily damaged. Soil stabilization conducted in this research is chemical stabilization using the selected mixture was rice husk ash (ASP) and lime. This test carried out with clayey by adding a mixture of rice husk ash and lime in a variation of clayey weight percentage of 0%, 4%, 8% and 12% of the dry weight of the soil, where the ratio between lime and rice husk ash is 50%: 50% and each mixture made as many as 3 samples. Water content in the original soil was 75.2 % decreased to 49.5% at 12% variation. The mixture of rice husk ash and lime ash makes the value of the liquid Limit (LL), plastic Limit (PL), and Shrinkage Limit (SL) decrease. This shows that the effect of rice husk ash and lime as added material in soil improvement has changed the technical properties of expansive clay for the better. CBR soil test increases significantly. CBR in the original soil of 1.9% increased to 8.0% in the rice ash husk plus lime mixture 4%, then experienced a significant increase in the 8% rice ash husk plus lime mixture that is 30.1%, and in the rice ash husk plus lime mixture 12% decreased to 10.7%. it can be concluded that the optimum undistrube CBR obtained at mixing with a percentage of 8% is 30.1%.Keywords: Stabilization, road, clay soil, mixture, optimum, CB

  • STABILISASI TANAH LEMPUNG MENGGUNAKAN CAMPURAN ABU SEKAM PADI DAN KAPUR DIEVALUASI DARI NILAI CBR UNSOAKED
    Direktorat Bina Teknik Jalan dan Jembatan, 2020
    Co-Authors: Sajati, Anis Fajar, Wulandari Sri
    Abstract:

    The quality of original soil in the Hambalang area of Citeureup - Bogor, virtualy shows low density mainly the unsoaked CBR value therefore unusable for subgrade stucture, and can cause road construction to be easily damaged. Soil stabilization conducted in this research is chemical stabilization using the selected mixture was rice husk ash (ASP) and lime. This test carried out with clayey by adding a mixture of rice husk ash and lime in a variation of clayey weight percentage of 0%, 4%, 8% and 12% of the dry weight of the soil, where the ratio between lime and rice husk ash is 50%: 50% and each mixture made as many as 3 samples. Water content in the original soil was 75.2 % decreased to 49.5% at 12% variation. The mixture of rice husk ash and lime ash makes the value of the liquid Limit (LL), plastic Limit (PL), and Shrinkage Limit (SL) decrease. This shows that the effect of rice husk ash and lime as added material in soil improvement has changed the technical properties of expansive clay for the better. CBR soil test increases significantly. CBR in the original soil of 1.9% increased to 8.0% in the rice ash husk plus lime mixture 4%, then experienced a significant increase in the 8% rice ash husk plus lime mixture that is 30.1%, and in the rice ash husk plus lime mixture 12% decreased to 10.7%. it can be concluded that the optimum undistrube CBR obtained at mixing with a percentage of 8% is 30.1%.Keywords: Stabilization, road, clay soil, mixture, optimum, CBRSalah satu kekuatan atau kekokohan suatu konstruksi ditentukan oleh kualitas bahan dasar yang dipergunakan. Seperti pada konstruksi jalan, sebagai bahan dasar (subgrade) juga sangat menentukan kekuatan jalan. Kualitas tanah asli pada daerah Hambalang kecamatan Citeureup, Bogor mempunyai daya dukung (kepadatan kering, CBR) rendah 1,9%, sehingga dapat menyebabkan konstruksi jalan akan cepat mengalami kerusakan. Stabilisasi tanah yang dilakukan pada penelitian ini adalah stabilisasi dengan cara kimiawi dan bahan campuran yang dipilih adalah abu sekam padi (ASP) dan kapur (Lime). Pengujian ini di lakukan dengan tanah lempung dengan menambah campuran abu sekam dan kapur dalam variasi persentase berat lempung sebesar 0%, 4%, 8% dan 12% dari berat kering tanah, dengan pengujian CBR Unsoaked tanpa pemeraman. Perbandingan antara kapur dan abu sekam padi adalah 50% : 50% dan masing-masing campuran dibuat sebanyak 3 sampel. Kadar air pada tanah asli sebesar 7,52% menurun menjadi 49,50% pada variasi 12%. Nilai CBR tanah meningkat secara signifikan. CBR pada tanah asli sebesar 1,9% meningkat menjadi 8,0% pada campuran abu 2% dan kapur 2%, kemudian mengalami peningkatan pada campuran abu 4% dan kapur 4% yaitu 30,1%, dan pada campuran abu 6% dan kapur 6% mengalami penurunan menjadi 10,7%. Dapat disimpulkan bahwa pada percampuran 8% diperoleh nilai CBR sebesar 30,1%.Kata Kunci: Stabilisasi, jalan, tanah lempung, campuran, optimum, CB

Sajati, Anis Fajar - One of the best experts on this subject based on the ideXlab platform.

  • CLAYEY SOIL STABILIZATION USING RICE HUSK ASH AND LIME EVALUATED BY CBR UNSOAKED
    Direktorat Bina Teknik Jalan dan Jembatan, 2020
    Co-Authors: Sajati, Anis Fajar, Wulandari Sri
    Abstract:

    Salah satu kekuatan atau kekokohan suatu konstruksi ditentukan oleh kualitas bahan dasar yang dipergunakan. Seperti pada konstruksi jalan, sebagai bahan dasar (subgrade) juga sangat menentukan kekuatan jalan. Kualitas tanah asli pada daerah Hambalang kecamatan Citeureup, Bogor mempunyai daya dukung (kepadatan kering, CBR) rendah 1,9%, sehingga dapat menyebabkan konstruksi jalan akan cepat mengalami kerusakan. Stabilisasi tanah yang dilakukan pada penelitian ini adalah stabilisasi dengan cara kimiawi dan bahan campuran yang dipilih adalah abu sekam padi (ASP) dan kapur (Lime). Pengujian ini di lakukan dengan tanah lempung dengan menambah campuran abu sekam dan kapur dalam variasi persentase berat lempung sebesar 0%, 4%, 8% dan 12% dari berat kering tanah, dengan pengujian CBR Unsoaked tanpa pemeraman. Perbandingan antara kapur dan abu sekam padi adalah 50% : 50% dan masing-masing campuran dibuat sebanyak 3 sampel. Kadar air pada tanah asli sebesar 7,52% menurun menjadi 49,50% pada variasi 12%. Nilai CBR tanah meningkat secara signifikan. CBR pada tanah asli sebesar 1,9% meningkat menjadi 8,0% pada campuran abu 2% dan kapur 2%, kemudian mengalami peningkatan pada campuran abu 4% dan kapur 4% yaitu 30,1%, dan pada campuran abu 6% dan kapur 6% mengalami penurunan menjadi 10,7%. Dapat disimpulkan bahwa pada percampuran 8% diperoleh nilai CBR sebesar 30,1%.Kata Kunci: Stabilisasi, jalan, tanah lempung, campuran, optimum, CBRThe quality of original soil in the Hambalang area of Citeureup - Bogor, virtualy shows low density mainly the unsoaked CBR value therefore unusable for subgrade stucture, and can cause road construction to be easily damaged. Soil stabilization conducted in this research is chemical stabilization using the selected mixture was rice husk ash (ASP) and lime. This test carried out with clayey by adding a mixture of rice husk ash and lime in a variation of clayey weight percentage of 0%, 4%, 8% and 12% of the dry weight of the soil, where the ratio between lime and rice husk ash is 50%: 50% and each mixture made as many as 3 samples. Water content in the original soil was 75.2 % decreased to 49.5% at 12% variation. The mixture of rice husk ash and lime ash makes the value of the liquid Limit (LL), plastic Limit (PL), and Shrinkage Limit (SL) decrease. This shows that the effect of rice husk ash and lime as added material in soil improvement has changed the technical properties of expansive clay for the better. CBR soil test increases significantly. CBR in the original soil of 1.9% increased to 8.0% in the rice ash husk plus lime mixture 4%, then experienced a significant increase in the 8% rice ash husk plus lime mixture that is 30.1%, and in the rice ash husk plus lime mixture 12% decreased to 10.7%. it can be concluded that the optimum undistrube CBR obtained at mixing with a percentage of 8% is 30.1%.Keywords: Stabilization, road, clay soil, mixture, optimum, CB

  • STABILISASI TANAH LEMPUNG MENGGUNAKAN CAMPURAN ABU SEKAM PADI DAN KAPUR DIEVALUASI DARI NILAI CBR UNSOAKED
    Direktorat Bina Teknik Jalan dan Jembatan, 2020
    Co-Authors: Sajati, Anis Fajar, Wulandari Sri
    Abstract:

    The quality of original soil in the Hambalang area of Citeureup - Bogor, virtualy shows low density mainly the unsoaked CBR value therefore unusable for subgrade stucture, and can cause road construction to be easily damaged. Soil stabilization conducted in this research is chemical stabilization using the selected mixture was rice husk ash (ASP) and lime. This test carried out with clayey by adding a mixture of rice husk ash and lime in a variation of clayey weight percentage of 0%, 4%, 8% and 12% of the dry weight of the soil, where the ratio between lime and rice husk ash is 50%: 50% and each mixture made as many as 3 samples. Water content in the original soil was 75.2 % decreased to 49.5% at 12% variation. The mixture of rice husk ash and lime ash makes the value of the liquid Limit (LL), plastic Limit (PL), and Shrinkage Limit (SL) decrease. This shows that the effect of rice husk ash and lime as added material in soil improvement has changed the technical properties of expansive clay for the better. CBR soil test increases significantly. CBR in the original soil of 1.9% increased to 8.0% in the rice ash husk plus lime mixture 4%, then experienced a significant increase in the 8% rice ash husk plus lime mixture that is 30.1%, and in the rice ash husk plus lime mixture 12% decreased to 10.7%. it can be concluded that the optimum undistrube CBR obtained at mixing with a percentage of 8% is 30.1%.Keywords: Stabilization, road, clay soil, mixture, optimum, CBRSalah satu kekuatan atau kekokohan suatu konstruksi ditentukan oleh kualitas bahan dasar yang dipergunakan. Seperti pada konstruksi jalan, sebagai bahan dasar (subgrade) juga sangat menentukan kekuatan jalan. Kualitas tanah asli pada daerah Hambalang kecamatan Citeureup, Bogor mempunyai daya dukung (kepadatan kering, CBR) rendah 1,9%, sehingga dapat menyebabkan konstruksi jalan akan cepat mengalami kerusakan. Stabilisasi tanah yang dilakukan pada penelitian ini adalah stabilisasi dengan cara kimiawi dan bahan campuran yang dipilih adalah abu sekam padi (ASP) dan kapur (Lime). Pengujian ini di lakukan dengan tanah lempung dengan menambah campuran abu sekam dan kapur dalam variasi persentase berat lempung sebesar 0%, 4%, 8% dan 12% dari berat kering tanah, dengan pengujian CBR Unsoaked tanpa pemeraman. Perbandingan antara kapur dan abu sekam padi adalah 50% : 50% dan masing-masing campuran dibuat sebanyak 3 sampel. Kadar air pada tanah asli sebesar 7,52% menurun menjadi 49,50% pada variasi 12%. Nilai CBR tanah meningkat secara signifikan. CBR pada tanah asli sebesar 1,9% meningkat menjadi 8,0% pada campuran abu 2% dan kapur 2%, kemudian mengalami peningkatan pada campuran abu 4% dan kapur 4% yaitu 30,1%, dan pada campuran abu 6% dan kapur 6% mengalami penurunan menjadi 10,7%. Dapat disimpulkan bahwa pada percampuran 8% diperoleh nilai CBR sebesar 30,1%.Kata Kunci: Stabilisasi, jalan, tanah lempung, campuran, optimum, CB