Study Of The Effectiveness Of The Use Of Gypsum And Volcanic Ash On Stability Of The Clay Soil Based On The CBR Value And The Unconfined Compression Test

2021 ◽  
Vol 12 (2) ◽  
pp. 37-45
Author(s):  
Ade Indra Utama Lubis
Keyword(s):  
Compression Test ◽  
Volcanic Ash ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Soil Classification ◽  
Specific Weight ◽  
Liquid Limit ◽  
Unconfined Compression ◽  
Unconfined Compression Test ◽  
Native Soil

Stabilization is one of the efforts to improve the condition of the soil which has a poor index of properties. One of the soil stabilization that is usually done is by adding chemicals to the soil. Chemicals commonly used in the form of cement, lime, bitumen. In this study, the stabilization of clay was carried out by adding gypsum and volcanic ash. The purpose of this study was to determine the value of the index properties due to the addition of 2% gypsum and volcanic ash on the clay soil, then to determine the maximum compressive strength value due to the addition of variations in stabilizing materials by testing the Unconfined Compression Test (UCT) and testing the California Bearing Ratio (CBR). ) laboratory. From the research, it was found that the original soil sample had a moisture content of 12.42%; specific weight 2.65; liquid limit 46.82% and plasticity index 29.40%. The original soil classification according to USCS is classified as Clay – Low Plasticity (CL) and according to AASHTO it is classified as A-7-6 (10). Unconfined Compression Test (UCT) values ​​for native soil and native soil plus 2% gypsum were 1.40 kg/cm2 and 1.66 kg/cm2. The laboratory CBR values ​​for soaked and unsoaked for the original soil were 4.44% and 6.28%, respectively. While the laboratory CBR values ​​soaked and unsoaked for the original soil plus 2% gypsum were 6.74% and 8.02%, respectively.The most effective results were obtained from a mixture of 2% gypsum and 10% volcanic ash with a UCT value of 2.79 kg/cm2 (an increase of 99.28%). For laboratory CBR testing, the most effective mixture was on a mixed variation of 2% gypsum and 9% volcanic ash with laboratory CBR values ​​soaked and unsoaked of 9.07% (an increase of 104.27% from the original soil) and 10 ,29% (an increase of 63.85% from the original land). The soil that has been mixed with the most effective stabilizer material, namely 2% gypsum and 9% volcanic ash is classified as Clay - Low Plasticity (CL) based on the USCS classification and is classified as A-6 (4) based on the AASHTO classification.

scholarly journals Pengaruh Penambahan Abu Cangkang Kelapa Sawit Pada Tanah Lempung Paccinongang Kabupaten Gowa

2021 ◽  
Vol 3 (2) ◽  
pp. 202-211
Author(s):  
Leonard Felix Widyo Sanderan ◽  
Irwan Lie Keng Wong ◽  
Monika Datu Mirring Palinggi
Keyword(s):  
Physical Properties ◽  
Compression Test ◽  
Oil Palm ◽  
Clay Soil ◽  
Soil Layer ◽  
Unconfined Compression ◽  
Free Press ◽  
Unconfined Compression Test ◽  
Palm Shell ◽  
Oil Palm Shell

Soil has an important role in a highway construction planning that serves to pass the load from the top layer, but not always the basic soil layer is able to function properly. Therefore, in this study was conducted to find out the effect of the addition of oil palm shell ash on clay soil to UCT (Unconfined Compression Test). The type of soil that will be usedfor penelitian is clay soil taken in Paccinongang area, Gowa Regency. The methodology in this study conducted several    soil physical properties testing then Kompaksi testing to obtain optimum moisture content value, and Unconfined Compression Test to get strong press value (qu). The results of the study showed that the soil meets the physical properties of clay soil. From The Free Press Strong test on the ash content of the palm shell 0%, 3%, 6%, 9%, 12% and 15% at point 1 the free press strength value decreased from 0% by 0.362% and increased at 9% by 0.424%. Meanwhile, at point 2, it decreased by 0% by 0.445% and increased at 12% by 0.423%.  From the Unconfined Compression Test on Paccinongang clay, Gowa Regency with the addition of oil palm shell ash from both samples, there was an increase in the addition of 9% and 12% of normal clay soil.

scholarly journals Comparison of the Use of Cement, Gypsum, and Limestone on the Improvement of Clay through Unconfined Compression Test

2019 ◽  
Vol 5 (2) ◽  
pp. 131
Author(s):  
Ika Puji Hastuty
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Soil Properties ◽  
Compression Test ◽  
Unconfined Compressive Strength ◽  
Soil Stabilization ◽  
Unconfined Compression ◽  
Unconfined Compression Test ◽  
Limestone Soil ◽  
Materials Used

Soil stabilization is an effort to improve soil properties by adding additives in the soil to increase the soil strength and maintain the shear strength of the soil. There are many materials which can be used as stabilizers. The materials used in this study were cement, gypsum, and limestone, then the compressive strength values were compared by using the Unconfined Compression Test (UCT). The mixture combinations used in this study were 1% to 10% of cement, gypsum, and limestone on clay by curing for 14 days. The compressive strength value resulted from the unconfined compression test on the original soil sample was 1.4 kg/cm2. The original soil was classified as moderately sensitive soil because the sensitivity value of the original soil was 2. After being stabilized with various mixtures of cement, gypsum, and limestone, soil stabilization using cement obtained the maximum unconfined compressive strength value is 3.681 kg/cm2 in the mixture of 10%. Similarly, the soil stabilization using limestone and gypsum also obtained its maximum unconfined compressive strength value in the mixture of 10% is 3.307 kg/cm2 and 2.975 kg/cm2, respectively.

scholarly journals Soil Stabilization on Problematic Soil with Traditional Stabilizer

2019 ◽  
Vol 8 (4) ◽  
pp. 11361-11364
Keyword(s):  
Compression Test ◽  
Soil Stabilization ◽  
Cementitious Material ◽  
Engineering Properties ◽  
Virgin Soil ◽  
Unconfined Compression ◽  
Unconfined Compression Test ◽  
Positive Results ◽  
Problematic Soil ◽  
Made In

The tumble down behaviour of super structure and substructure is caused due to the problematic soil which is more prone to shrink-swell process. In this event to contrive, a substitute which is naturally available has been blended with virgin soil. The basic Engineering properties has been studied which shows more positive results towards Atterberg’s Limit. The mould is embossed with the soil with lime at different proportion of 0 %, 2%, 4% and 8 %. The strength of the soil was studied with help of unconfined compression test. For 8% lime, UCC value is 2250 kPa in 28 days which shows the formation of cementitious material. An attempt made in this paper is to show the firmness of soil and lime.

scholarly journals ANALISIS BALIK KUAT GESER TANAH TERSTABILISASI SEMEN DENGAN METODE NUMERIK

2020 ◽  
Vol 5 (1) ◽  
pp. 48-57
Author(s):  
Muhammad Toyeb
Keyword(s):  
Compression Test ◽  
Soil Stabilization ◽  
Stress And Strain ◽  
Test Results ◽  
Unconfined Compression ◽  
Soil Tests ◽  
Unconfined Compression Test ◽  
Soil Model ◽  
Laboratory Test Results ◽  
Hardening Soil Model

Shear strenght is a parameter to soils strenght analysis. Shear strenght can be obtained from laboratorium test that interpreted as stress and strain. Soil tests had done on soil stabilization of cement with mixing 5%; 10%; 15% of content. Soil tests were used by triaxial test of unconsolidated undrained (triaxial UU) with cell pressure at 50; 100; 200 kN/m2 and unconfined compression test. The test specimens were disturbed soil samples which compacted and remolded, and then carry out curing for 0; 3; 7; 14; 28 days. The laboratory test results were back analysis in Plaxis 2D by using Mohr-Coulumb and Hardening Soil model later. The Mohr-Coulumb and Hardening Soil model had deviator stress results was almost equal to the test results of triaxial UU and unconfined compression test. Especially of strain by Mohr-Coulumb model, shew the lower strain than be showed by triaxial UU test and unconfined compression test. The Hardening Soil model, provides fluctuating strain results of triaxial UU test because it is affected by the application of cell pressure (σ3) and it provides greater strain results from unconfined compression test.   Keywords: Triaxial UU, Unconfined Compresssion, Stress and Strain, Plaxis 2D

scholarly journals Effects of Initial Water Content on Microstructure and Mechanical Properties of Lean Clay Soil Stabilized by Compound Calcium-Based Stabilizer

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1933 ◽  
Author(s):  
Chenglong Yin ◽  
Wei Zhang ◽  
Xunli Jiang ◽  
Zhiyi Huang
Keyword(s):  
Water Content ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Soil Aggregates ◽  
Optical Microscope ◽  
Initial Water Content ◽  
Reaction Products ◽  
Unconfined Compression Test ◽  
Initial Water ◽  
X Ray

Initial water content significantly affects the efficiency of soil stabilization. In this study, the effects of initial water content on the compressibility, strength, microstructure, and composition of a lean clay soil stabilized by compound calcium-based stabilizer were investigated by static compaction test, unconfined compression test, optical microscope observations, environment scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The results indicate that as the initial water content increases in the range studied, both the compaction energy and the maximum compaction force decrease linearly and there are less soil aggregates or agglomerations, and a smaller proportion of large pores in the compacted mixture structure. In addition, for specimens cured with or without external water supply and under different compaction degrees, the variation law of the unconfined compressive strength with initial water content is different and the highest strength value is obtained at various initial water contents. With the increase of initial water content, the percentage of the oxygen element tends to increase in the reaction products of the calcium-based stabilizer, whereas the primary mineral composition of the soil-stabilizer mixture did not change notably.

scholarly journals An Investigation on the Effect of Calcite Bacteria Seeding on Shear Strength of Peat Soil via an Unconfined Compression Test

2015 ◽  
Vol 773-774 ◽  
pp. 1513-1517
Author(s):  
Norbaya Sidek ◽  
S. Abdul-Talib ◽  
N. Mohd Zain ◽  
N.R.N.A. Rashid ◽  
I.A. Abu Bakar
Keyword(s):  
Shear Strength ◽  
Liquid Medium ◽  
Compression Test ◽  
Peat Soil ◽  
High Water Content ◽  
Unconfined Compression ◽  
Water Control ◽  
Unconfined Compression Test ◽  
Sporosarcina Pasteurii ◽  
Modified Urea

Peat soils have been known for their problematic characteristics which include high water content, high compressibility and low shear strength. In this study, an attempt was made to investigate the effect of 1 week addition of modified Urea-CaCl2liquid medium with and withoutSporosarcina pasteuriion the shear strength of unsterilized dried peat soil using the Unconfined Compression Test. After the treatment period, significant increase in the shear strength of the soil was found to be highest for peat + medium at 42 kN/m2, moderate for peat + medium +Sporosarcina pasteuriiat 27 kN/m2and unchanged for peat + water control at 24 kN/m2. Although the growth dynamics of all the microbes involved in the calcite formation in the treated peat soil were not known, the addition of the modified Urea-CaCl2liquid medium into the soil clearly had contributed to the marked increased in the shear strength of the soil. It is probable that the medium had promoted a better growth of indigenous calcite bacteria population in the soil which may have been suppressed by the slow growingS. pasteuriipopulation being added daily to the soil

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