The Effect of Clay Shale Drying on the Reduction of Compressive Strength and Durability in Bawen Sub-District, Semarang Regency

Pardoyo, Bambang; Kresno, Wikan Sadono; Fahreza, Dhimas Andra; Maulana, Tubagus Awan

doi:10.13189/cea.2020.080619

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…According to laboratory test, the residual strength of clayshale on this location decreased to 8.3 kPa for saturated cohesion and 4.6 degree for saturated internal friction of angle (Alatas, Kamaruddin, Nazir, & Irsyam, 2015). According ro Pardoyo, et al (2020), Semarang Bawen clayshale strength is decreased to 59% for UCS value and 36 % for modulus elasticity parameter (E50) after 90 minutes drying process. Clay-shale instability may be caused by the texture and structure of the sediment and the mineral structure.…”

Section: Introductionmentioning

confidence: 90%

Residual Strength Parameter Method for Slope stability on a Toll Road with Expansive Clay

Pamungkas

Putranto²,

Suharyanto³

et al. 2022

J. Geoscience Eng. Environ. Technol.

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The decreasing stability phenomenon needs to be considered during the design of cut slopes on problematic soil. Excavation slope of toll road construction tends to fail when it lies above clay-shale strata. Certain common correlations and ordinary analytical methods are not recommended for safety calculation. This study is intended to find out the characteristic of clay-shale and proper slope inclination design on Semarang Batang Toll Road. The behaviour of a clay-shale area on the cut slope of Batang-Semarang toll road segment STA 438+000–STA 439+000 was identified. The degradable and expansive properties caused slope failure of the initial design with an inclination of 1 H: 1 V. Laboratory tests found that the soil had a clay faction > 40% and can be categorized as high plasticity (LL > 50%). An empirical approach determined that the residual shear strength decreased to phi < 6 degrees. To describe the swelling after the excavation stage, the flow deformation was determined by a finite element simulation. During the swelling phase, the pore water pressure was maintained at a certain value, and a gentler slope fulfilled the minimum safety factor with an inclination of 1 V: 3 H. Furthermore, the shear strength of the clay-shale was reduced to that for a fully softened material, and all the slope factors for safety moved to a critical state. According to the simulation, the minimum suggested slope inclination is 5 H: 1 V. This approach is important for the maintenance of pore water pressure and the prevention of an additional reduction in the shear strength so as to avoid slope failure on clay-shale regions in the yielding stage.

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Section: Introductionmentioning

confidence: 90%

Residual Strength Parameter Method for Slope stability on a Toll Road with Expansive Clay

Pamungkas

Putranto²,

Suharyanto³

et al. 2022

J. Geoscience Eng. Environ. Technol.

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“…Sedangkan pada tanah clayshale di daerah Bawen Kapubaten Semarang mengenai tingkat durabilitas yang telah dilakukan penelitian adalah hasil sifat fisis pada uji Atterberg adalah tanah clayshale sebagai tanah anorganik dengan plastisitas tinggi, serta susut pada uji penyalaan sebagai anorganik. Sedangkan free swell dan mineral garam, semakin tinggi unsur garam, semakin tinggi free swell dan uji mekanisnya kuat tekan bebas dikategorikan sebagai tanah padat sedangkan uji Slake durability tergolong durabilitas sangat rendah (Pardoyo dkk., 2020), clayshale dilihat dari pengaruh akibat penjemuran, hasilnya tentang pengaruh pengeringan dapat menurunkan (Pardoyo, Sadono, & Fahreza, 2020) dan clayshale dilihat dari perilakunya, hasilnya pada uji durabitas dikategorikan tingkat ketahanan batuan sangat rendah dan rendah, sedangkan uji free swelling dikategorikan sebagian besar tingkat perkembangan sedang dan kecil, nilai shale rating semua sampel dikategorikan rendah dengan kemiringan aman berkisar antara 7 ° -22 ° atau rasio kemiringan adalah antara 8H. : 1V -3H: 1V dan nilai ketebalan lapisan pemadatan berkisar 0 -400 mm, untuk densitas nilai pemadatan berkisar 1,72 -2,10 t / m3.…”

Section: Pendahuluanunclassified

Analysis Of The Residual Red Soil Shear Test With The Slurry Method In The Regency Of Semarang

Pardoyo

Wirawan

Huda

2021

TEKNIK

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Residual soil is found in most areas with mountainous, hilly, and undulating topography. This soil is marked by red or brown color. This study aims to determine the physical and mechanical properties of soil in the original soil and residual soil conditions using the slurry method. Research objects were taken from residual red soil of The East Ungaran District, Bergas District, and Bawen District. Analysis of the physical and mechanical properties test shows that the soil sample is a type of clay with kaolinite constituent minerals and moderate swelling ability, and direct shear testing from locations L1, L2, and L3 obtained residual peak shear angles using the slurry method of 29,249 °; 31,341 °; 31,964 ° and constant residual shear angle value of 8,082 °; 8,138 °; 7,294 °, the value of the original soil shear angle has a value of 32.82 °; 31.44 °; 31.98. The higher the value of the plasticity index, the higher the value of the free swell. The relationship between the plasticity index and the value of the residual peak shear angle shows that the results of the peak shear angle and the plasticity index are still within the scope of standard deviation. The value of the constant residual shear angle with the slurry method is much smaller than the test result graph.

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“…Although some methods have been established in the durability of soil elements, it is necessary to carry out studies to recognize other effects [8]. Degradation is independent of other effects like drying that affect surface [9]. Once the blocks are in their final state with or without any additive or stabilizing component [10], the development of a biofilm can be quantified through direct observation of its thickness, which is practically impossible or expensive.…”

Section: Introductionmentioning

confidence: 99%

Morphological Evaluation of Surface Degradation and Mechanical Properties of Compressed-Earth Blocks (CEB)

Loaiza¹,

Pérez-Sánchez²,

Suárez-Domínguez³

et al. 2021

cea

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Earth architecture has been an ecological alternative since the surrounding materials can be used. The durability of earth elements such as compressed-earth blocks (a soil brick) is less than that of traditional blocks. In the present work, the evaluation of weathered earth-based walls was carried out after six years in the mid-region of the Gulf of Mexico coast (Tampico, Tamaulipas, Mexico) and contrasted with sections of compressed earth block without environmental degradation. The blocks were fabricated from two different blends with the following materials: (A) 50.4% clay soil (Altamira, Tamaulipas, Mexico), 38.4% Medrano sand, 6.4% cement, and 4.8% nopal mucilage aqueous solution (1:10). (B) 50% clay soil, 35% cement, 10% lime, and 5% nopal mucilage aqueous solution. A stochastic model was developed from image analysis to understand the biofilm formation process, and the modification of the compressive strength was evaluated. It was found that the compressive strength decreases (up to 65%) due to degradation. The CEBs stabilized with lime showed no surface changes, and there were no changes in the strength properties. For the cases in which there was degradation, it the fractal dimension and the respective specific surface area were found to have increased. This work can improve the perception of using this material in Mexico's regions, where the humidity levels are potentially dangerous for the earthen structures. Besides, it offers a non-destructive methodology to determine the deterioration of housing walls built with earth elements.

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The Effect of Clay Shale Drying on the Reduction of Compressive Strength and Durability in Bawen Sub-District, Semarang Regency

Cited by 4 publications

References 6 publications

Residual Strength Parameter Method for Slope stability on a Toll Road with Expansive Clay

Residual Strength Parameter Method for Slope stability on a Toll Road with Expansive Clay

Analysis Of The Residual Red Soil Shear Test With The Slurry Method In The Regency Of Semarang

Morphological Evaluation of Surface Degradation and Mechanical Properties of Compressed-Earth Blocks (CEB)

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