Improving Low Temperature Compaction of a Granular Soil

1975 ◽  
Vol 12 (4) ◽  
pp. 527-530 ◽  
Author(s):  
B. D. Alkire ◽  
W. M. Haas ◽  
T. J. Kaderabek
Keyword(s):  
Calcium Chloride ◽  
Freezing Temperature ◽  
Pore Fluid ◽  
Silty Sand ◽  
Dry Density ◽  
Eutectic System ◽  
Simple Eutectic System ◽  
Density Relationship ◽  
Test Soil ◽  
Relationship Of

The dry density of a silty sand compacted at temperatures below 0 °C can be improved by using calcium chloride as an additive. Compaction tests at −7 °C were used to determine the effect of low amounts of calcium chloride on the moisture–density relationship of the test soil. Tests at 20 °C were conducted to provide a frame of reference for comparing the results obtained at the below freezing temperature. The results from the experimental work are analyzed by modeling the pore fluid as a simple eutectic system using the concepts of phase equilibria. The amount of ice in the pore fluid is shown to have a significant effect on the dry density of a soil compacted at temperatures below 0 °C.

The Application of Impact Tester for Compaction Control

2014 ◽  
Vol 501-504 ◽  
pp. 254-257
Author(s):  
J. Y. Wu ◽  
J. X. Wang
Keyword(s):  
Moisture Content ◽  
Silty Sand ◽  
Dry Density ◽  
Current Standard ◽  
Efficient Manner ◽  
Density Relationship ◽  
Earth Structures ◽  
Impact Tester ◽  
Compaction Control ◽  
Non Destructive

The safety of the earth structures is highly dependent upon the fill compaction quality. Recently developed nondestructive testing techniques (NDT) present many advantages in comparison with conventional field density measurements. Therefore, use of NDT in monitoring of the fill quality appears to be attractive for future pavement geotechnics applications. This paper presents an alternative technology using non-destructive Clegg impact tester for compaction control in silty sand. 132 compaction tests and impact tests with varying values of compaction effort, moisture content, and density were conducted in laboratory. Each observed impact value (Iv) was then considered as a function of its corresponding compaction effort, moisture content and dry density. Results of the study show that for the silty sand tested, the variations of Iv with moisture content are similar to the corresponding unique moisture-density compaction relationship. The values of Iv generally correlate well with moisture-density relationship for each compaction effort. Along with a speedy moisture tester, dry density can be predicted using target Iv values in a fast and efficient manner based on current standard specification.

Moisture-Density Relationship of Bottom Ash, Lime Stabilized Bangkok Clay as a Potential Pavement Material in Thailand

2019 ◽  
Vol 972 ◽  
pp. 50-56
Author(s):  
Akanksha Bhurtel ◽  
Amin Eisazadeh
Keyword(s):  
Clayey Soil ◽  
Bottom Ash ◽  
Dry Density ◽  
Test Results ◽  
Maximum Dry Density ◽  
Water Contact ◽  
The Road ◽  
Density Relationship ◽  
Relationship Of ◽  
Pavement Material

Expansive clayey soils like Bangkok clay can shrink and swell with water contact. Therefore, the presence of such soils tends to damage the road conditions with a higher frequency of rainfall in Thailand. The presence of expansive clayey soil has brought the concept of stabilization of such roads with any other stronger materials. This paper shows the test results on the moisture-density relationship of bottom ash and lime stabilized Clayey soil to use as a pavement material in Thailand. In this study, a waste material produced from coal combustion called bottom ash was used as a replacement material and quicklime as a binding material. During the tests 10%, 20%, 30% and 50% bottom ash and 4%, 8%,12% Lime were used. The result shows a decrease in Maximum Dry Density and increase in Optimum Moisture Content with an increase in each amount of replacement material.

Scaling law of static liquefaction mechanism in geocentrifuge and corresponding hydromechanical characterization of an unsaturated silty sand having a viscous pore fluid

2015 ◽  
Vol 52 (6) ◽  
pp. 708-720 ◽  
Author(s):  
Amin Askarinejad ◽  
Alexander Beck ◽  
Sarah M. Springman
Keyword(s):  
Pore Pressure ◽  
Scaling Laws ◽  
Scaling Law ◽  
Pore Fluid ◽  
Silty Sand ◽  
Excess Pore Pressure ◽  
Geotechnical Centrifuge ◽  
Time Scaling ◽  
Static Liquefaction ◽  
Viscous Solution

Fast landslides induced by rainfall impose considerable damage on infrastructure and cause major casualties worldwide. Static liquefaction is one of the triggering mechanisms mentioned frequently in the literature as a cause of this type of landslide. The scaling laws required to model this mechanism in the geotechnical centrifuge are developed, and it is shown that either a reduction in the soil pore size or use of a viscous pore fluid is needed to unify the time scaling factors of contractive volume change of the saturated voids and dissipation of the excess pore pressure generated. The latter option was used in this research; therefore, the influences of the viscous pore fluid on the hydromechanical characteristics of a silty sand were investigated. Subsequently, geocentrifuge tests were conducted to compare the behaviour of a slope having a viscous solution as the pore fluid with that of a model with water as the pore fluid. Both slopes were subjected to rainfall, and the evolution of the pore pressure and surface movements were monitored.

scholarly journals Contact Melting in Simple Eutectic System

2011 ◽  
Vol 15 ◽  
pp. 01020 ◽  
Author(s):  
V. S. Savvin ◽  
Ye. Yu. Pomytkina ◽  
N. N. Anokhina
Keyword(s):  
Contact Melting ◽  
Eutectic System ◽  
Simple Eutectic System

scholarly journals Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze-Thaw Effect with Water Supplement

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yanlong Li ◽  
Zili Wang ◽  
Yang Luo
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Expansive Soil ◽  
Freezing Temperature ◽  
Strength Reduction ◽  
Dry Density ◽  
Direct Shear ◽  
Soil Columns ◽  
Freeze Thaw ◽  
Shear Strength Reduction

Shear strength of shallow expansive soil varies along with the depth under the freeze-thaw effect. This work investigates shear strength characteristics of shallow expansive soil by simulating the actual freeze boundary conditions of seasonal frozen areas with water supplement. An integrated approach incorporating the freeze-thaw test and direct shear test was adopted. Firstly, unidirectional freezing tests for expansive soil columns under three different freezing temperature gradients were carried out. Secondly, direct shear tests under low vertical stress were performed on the standard samples, which were prepared by using cutting rings cut the thawed expansive soil columns into nine segments along with the depth. Temperature, water content, and dry density at different depths were also investigated after the freeze-thaw process. The test results showed that, after the freeze-thaw process, the shear strength of expansive soil columns showed significant differences along with the depth and highly correlated with water content, specifically the higher water content and the lower shear strength. The minimum shear strength in the expansive soil columns occurred at the soil layer below the frozen and unfrozen zones interface. The expansive soil column’s shear strength changed most under the moderate freezing temperature gradient corresponding to the most considerable shear strength reduction. Moreover, the significant decrease in cohesion was the main reason for the shear strength reduction of expansive soil after the freeze-thaw process. These results indicate significant depth variability in shear strength of expansive soil under the freeze-thaw effect.

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