scholarly journals Pemanfaatan Limbah Penambangan Bukit Kapur Untuk Stabilisasi Tanah Lempung ( Clay )

2021 ◽  
Vol 18 (2) ◽  
pp. 167-174
Author(s):  
Enita Suardi ◽  
Zulfira Mirani ◽  
Silvianengsih Silvianengsih ◽  
Oni Guspari ◽  
Desmon Hamid
Keyword(s):  
Water Content ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Optimal Level ◽  
Mining Waste ◽  
New Materials ◽  
Optimum Water Content ◽  
Level Of Use ◽  
Limestone Hill ◽  
Optimum Water

Soil stabilization by adding new materials is one of the alternatives to soil repair that can improve the properties of the soil, namely by mixing new materials and soil that is then compacted. Waste left over limestone hill mining,among others in the form of materials with various sizes of granules. This study aims to review the effect of the addition of limestone hill mining waste material on the density and value of the California Bearing Ratio (CBR)  of clay soil. Tests conducted only on a laboratory scale with variations in the increase in limestone hill  mining waste levels are  0%, 5%, 10%, and 15% to the total weight of the mixture. Laboratory CBR testing is performed under optimum water content conditions. The results showed that the stabilization of soft soils using limestone hill mining waste, can increase the density and value of soil CBR. The most optimal level of use of limestone hill mining waste and which provides the highest CBR value is for the addition of  5%of limestone hill mining waste with a CBR value of 26.5%.

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.

Aspects of the behaviour of compacted clayey soils on drying and wetting paths

2002 ◽  
Vol 39 (6) ◽  
pp. 1341-1357 ◽  
Author(s):  
Jean-Marie Fleureau ◽  
Jean-Claude Verbrugge ◽  
Pedro J Huergo ◽  
António Gomes Correia ◽  
Siba Kheirbek-Saoud
Keyword(s):  
Water Content ◽  
Pore Water ◽  
Unsaturated Soils ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Dry Density ◽  
Clayey Soils ◽  
Maximum Dry Density ◽  
Optimum Water Content ◽  
Optimum Water

A relatively large number of drying and wetting tests have been performed on clayey soils compacted at the standard or modified Proctor optimum water content and maximum density and compared with tests on normally consolidated or overconsolidated soils. The results show that drying and wetting paths on compacted soils are fairly linear and reversible in the void ratio or water content versus negative pore-water pressure planes. On the wet side of the optimum, the wetting paths are independent of the compaction water content and can be approached by compaction tests with measurement of the negative pore-water pressure. Correlations have been established between the liquid limit of the soils and such properties as the optimum water content and negative pore-water pressure, the maximum dry density, and the swelling or drying index. Although based on a limited number of tests, these correlations provide a fairly good basis to model the drying–wetting paths when all the necessary data are not available.Key words: compaction, unsaturated soils, clays, drying, wetting, Proctor conditions.

Compacted soil behaviour through changes of density, suction, and stiffness of soils with remoulding water content

2018 ◽  
Vol 55 (2) ◽  
pp. 182-190 ◽  
Author(s):  
T.W. Zhang ◽  
Y.J. Cui ◽  
F. Lamas-Lopez ◽  
N. Calon ◽  
S. Costa D’Aguiar
Keyword(s):  
Water Content ◽  
Dry Density ◽  
Soil Plasticity ◽  
Optimum Water Content ◽  
Hydromechanical Behaviour ◽  
The Difference ◽  
Two Peaks ◽  
Soil Behaviour ◽  
Optimum Water ◽  
Water Contents

To better understand the overall hydromechanical behaviour of interlayer soil, the compaction behaviour of one of the two components — the portion of fines (<4 mm) that is sensitive to water content changes — was investigated. The standard Proctor compaction curves were first determined for the soils. Then, the maximum shear modulus, Gmax, and suction were measured on samples statically compacted at an identical dry density, but different remoulding water contents. The changes in Gmax reveal the existence of a characteristic water content corresponding to the maximum Gmax. The results also show that this characteristic water content increases with the soil plasticity, being similar to the variation trend of optimum water content with soil plasticity. A bimodal pattern was observed from the plot of total suction ψ versus the slope of water content w–log(ψ) curve. The suction corresponding to the maximum Gmax is close to the lowest point between the two peaks in the ψ–dw/dlog(ψ) curve. A reasonable explanation was attempted for the correspondence between the “optimum water content” defined by the maximum value of Gmax and the corresponding suction. The difference between the static and dynamic compactions was also explained in terms of suction values.

Mechanical Properties of Bentonite-Sand Mixtures Under Triaxial Stress Condition

1994 ◽  
Vol 353 ◽  
Author(s):  
M. Umedera ◽  
A. Fujiwara ◽  
N. Yasufuku ◽  
M. Hyodo ◽  
H. Murata
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Water Content ◽  
Triaxial Compression ◽  
Confining Pressure ◽  
Strength Properties ◽  
Compression Tests ◽  
Optimum Water Content ◽  
Triaxial Compression Tests ◽  
Optimum Water

AbstractA series of triaxial compression tests is being conducted under the drained condition on bentonite and sand mixtures, known as buffer, in saturated and optimum water content states to clarify the mechanical properties of the buffer.It was found that the mechanical properties of bentonite and sand mixtures are strongly influenced by water and bentonite contents: shear strength in a saturated state is less than that in an optimum water content state; shear strength decreases rapidly with increasing bentonite content. Strength properties are much dependent on confining pressure.

scholarly journals Research on the Optimum Water Content of Detecting Soil Nitrogen Using Near Infrared Sensor

Sensors ◽  
2017 ◽  
Vol 17 (9) ◽  
pp. 2045 ◽  
Author(s):  
Yong He ◽  
Shupei Xiao ◽  
Pengcheng Nie ◽  
Tao Dong ◽  
Fangfang Qu ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Nitrogen ◽  
Near Infrared ◽  
Infrared Sensor ◽  
Optimum Water Content ◽  
Optimum Water

Study on Reasonable Feature of Compaction Loess with Air Porosities

2012 ◽  
Vol 238 ◽  
pp. 441-446
Author(s):  
Jing Yang ◽  
Ling Hao Wang ◽  
Fu Li Ma ◽  
Xiao Hong Bai
Keyword(s):  
Quality Control ◽  
Water Content ◽  
Dry Density ◽  
Compression Coefficient ◽  
Optimum Water Content ◽  
Compaction Energy ◽  
Internal And External Factors ◽  
And Control ◽  
Compaction Method ◽  
Optimum Water

The degree of compaction is usually used as the compaction quality and control indicator of backfill in practical project. However, as the degree of compaction is affected by various internal and external factors, its accuracy is difficult to guarantee. In this paper, compacted loess samples were prepared under different compaction energies by normal compaction method. The curves of compression coefficient and dry density, the compression coefficient and porosity of compaction loess samples under different compaction energy are analyzed while the water content is constant. The air porosities of compaction loess samples under different compaction energy and water content are calculated and summed up. The air porosity of compaction loess samples under different compaction energy is more stable than the degree of compaction when the water content is exactly equal to the optimum water content. The rationality of using air porosity as the loess compaction quality control indicator is discussed. It is proposed using air porosity as additional indicator of compaction quality control on the condition of the loess compacted dry density meeting the requirements. The air porosity less than 6.5% is suggested as the additional quality control indictor for region backfill compaction.

Properties of Enzymatic Hydrolysis Corn Starch Sizing Agent Modified in Supercritical Carbon Dioxide

2011 ◽  
Vol 332-334 ◽  
pp. 2103-2107
Author(s):  
Yue Juan Wang ◽  
Hong Jun Fu
Keyword(s):  
Carbon Dioxide ◽  
Enzymatic Hydrolysis ◽  
Water Content ◽  
Supercritical Co2 ◽  
Corn Starch ◽  
Enzymatic Reaction ◽  
Variance Ratio ◽  
Optimum Water Content ◽  
Co2 Treatment ◽  
Optimum Water

This paper describes an experiment of Corn starch treatment with α-amylase under the condition of supercritical CO2 at 50°C, 11MPa, and investigates the effects of different water content on supercritical CO2 treatment of corn starch. The results demonstrate that the viscosity of the treated starch is much lower than that of untreated starch, as well as the variance ratio of the viscosity is up to 96%. The optimum water content for the degradation of the enzymatic reaction is 2%;when water content is up to 3%, the viscosity of the serosity is 5Mpa•s, and the sizing performance reaches the best.

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

2018 ◽  
Author(s):  
Chenglong Yin ◽  
Wei Zhang ◽  
Xun-li Jiang ◽  
Zhi-yi 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 spectroscopy. 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 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 oxygen element tends to increase in the reaction products of the calcium-based stabilizer, whereas the crystalline mineral of the soil did not change obviously.

THE CATALYTIC DEHYDRATION OF ETHYL ALCOHOL BY ALUMINA: I. THE EFFECT OF THE WATER CONTENT OF THE CATALYST

1935 ◽  
Vol 12 (5) ◽  
pp. 707-710 ◽  
Author(s):  
L. A. Munro ◽  
W. R. Horn
Keyword(s):  
Water Content ◽  
Ethyl Alcohol ◽  
Optimum Water Content ◽  
Optimum Water ◽  
Alumina Catalysts

The dehydration of ethyl alcohol has been studied at 250 °C. using alumina catalysts differing in water content. There is an optimum water content for the greatest activity of the catalyst. The apparent poisoning is greatest for those catalysts having greatest activity. There is no apparent poisoning for a catalyst having zero water content. In no case was the course of the reaction changed.

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