Swelling behaviour of expansive soils with recycled geofoam granules column inclusion

2019 ◽  
Vol 47 (1) ◽  
pp. 1-11 ◽  
Author(s):  
S. Selvakumar ◽  
B. Soundara
Keyword(s):  
Expansive Soils ◽  
Swelling Behaviour

scholarly journals Combined effect of mineralogical and chemical parameters on swelling behaviour of expansive soils

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bendadi Hanumantha Rao ◽  
Peddireddy Sreekanth Reddy ◽  
Bijayananda Mohanty ◽  
Krishna R. Reddy
Keyword(s):  
Expansive Soils ◽  
Research Work ◽  
Swelling Pressure ◽  
Combined Effect ◽  
Practical Significance ◽  
Chemical Compositions ◽  
Chemical Parameters ◽  
Swelling Behaviour ◽  
Mineral Contents ◽  
Swelling Properties

AbstractMicrolevel properties such as mineralogical and chemical compositions greatly control the macro behaviour of expansive soils. In this paper, the combined effect of mineral (i.e. montmorillonite, MMC) and chemical contents (i.e. Ca and Na in their total (T), leachable (L) and exchangeable form (CEC)) on swelling behaviour is investigated in a comprehensive way. Several 3-dimensional (3D) graphs correlating MMC and Ca/Na ratio, together, with swelling property (swelling potential, Sa, and swelling pressure, Sp) are developed. 3D plots, in general, portrayed a non-linear relationship of Sa and Sp with MMC and Ca/Na ratio, together. It is hypothesized that swelling initially is triggered by chemical parameters due to their quick and rapid ionization capability, but the overall swelling phenomenon is largely controlled by MMC. It is importantly found that expansive soils are dominant with divalent Ca++ ions up to MMC of 67% and beyond this percentage, monovalent Na+ ions are prevalent. From the interpretation of results, the maximum Sa of 18% and Sp of 93 kPa is measured at MMC of 43%, (Ca/Na)T of 10–14 and (Ca/Na)L of 2–7. It is concluded from study that total CEC + MMC for determining Sa and (Ca/Na)T + MMC for determining Sp are superior parameters to be considered. The findings of the study also excellently endorsed the results of Foster32, who stated that ionization of Na or Ca depends on the constituent mineral contents. The findings presented herein are unique, interesting and bear very practical significance, as no earlier research work reported such findings by accounting for chemical and mineralogical parameters impact, in tandem, on swelling properties.

scholarly journals The Use of Geogrids in Mitigating Pavement Defects on Roads Built over Expansive Soils

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Richard Shumbusho ◽  
Gurmel S. Ghataora ◽  
Michael P.N. Burrow ◽  
Digne R. Rwabuhungu
Keyword(s):  
Seasonal Changes ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Real Field ◽  
Experimental Program ◽  
Swelling Potential ◽  
Swelling Behaviour ◽  
Wetting And Drying ◽  
Potential Benefits

This study was conducted to investigate the potential benefits of using geogrids in mitigating pavement defects notably roughness and longitudinal cracking on pavements built over expansive soils. The seasonal changes of expansive soils (periodic wetting and drying) cause detrimental effects on the overlying road pavements. Such detrimental behavior of expansive soils was simulated in a controlled laboratory environment through allowing cyclic wetting and drying of an expansive soil underlying a pavement section. The shrink/swell effects of the expansive soil subgrade were examined through monitoring its change in moisture, and measuring deformation of overlying pavement section. The experimental study suggested that a geogrid layer in a reinforced pavement section can reduce surface differential shrinking and swelling deformation resulting from underlying expansive soils by a factor of 2 and 3 respectively in comparison to unreinforced section. Given that an oedometer test which is typically used to predict swelling potential of expansive soils is known to overpredict in-situ soil swell, experimental program also investigated quantitatively the extent to which the oedometer can overestimate swelling behaviour of the real-field scenarios. It was found that oedometer percent swell can overpredict in-situ swelling behaviour of the expansive soil by a factor ranging between 2 and 10 depending upon the period over which the in-situ expansive soil has been in contact with water.

Swell-Shrinkage Behavior of Remolded Expansive Soils

2011 ◽  
Vol 243-249 ◽  
pp. 3050-3055
Author(s):  
Cheng Yu ◽  
Jin Cheng Wei
Keyword(s):  
Laboratory Tests ◽  
Expansive Soils ◽  
Initial State ◽  
Swelling Behaviour ◽  
Moisture Contents ◽  
State Index ◽  
Logarithmic Relationship ◽  
Initial Results ◽  
Unique Relationship ◽  
Shrinkage Behavior

The swelling behaviour of compacted expansive soils have been studied with variation in initial state. For comparison, a series of swell and shrinkage capacity laboratory tests with different initial dry densities，moisture contents and pressures have also been made with three different consistency state. Both percent swell and shrinkage are significantly influenced by the consistency state index. There is an unique relationship between percent swell and consistency state index of the soil. The percent swell-load relationship could be identified as a logarithmic relationship facilitating the prediction of ultimate percent swell under different load with a few initial results.

scholarly journals Experimental and analytical investigations of volume change behaviour of saturated expansive soils in oedometer test

2019 ◽  
Vol 92 ◽  
pp. 10006
Author(s):  
Misa Hiraga ◽  
Hiroyuki Kyokawa ◽  
Junichi Koseki
Keyword(s):  
Expansive Soils ◽  
Swelling Behaviour ◽  
Oedometer Test ◽  
Lower Shear ◽  
Lateral Contraction ◽  
Mechanical Behaviours ◽  
Water Saturated ◽  
Electrochemical Phenomena ◽  
Mechanical Consolidation ◽  
Oedometer Tests

The chemical and mechanical behaviours of saturated bentonite were experimentally and analytically investigated. A series of oedometer tests on saturated bentonite was conducted. By replacing the cell fluid during the oedometer test, one-dimensional osmotic consolidation and swelling behaviour were observed. The experimental results were simulated numerically using a constitutive model by considering the influence of electrochemical phenomena of clay mineral crystals on the macrostructural behaviour. It was concluded that the typical mechanical swellability of water-saturated bentonite in oedometer test is affected by a positive dilatancy behaviour due to the lower shear strength. After the osmotic consolidation test, a lateral contraction of the specimen in the oedometer was observed; this affected the compressibility during the subsequent mechanical consolidation. It was also concluded that the concentration of Na+ in the pore fluid affects the specific mechanical properties of bentonite.

Influence of Randomly Distributed Waste Tire Fibres on Swelling Behaviour of Expansive Soils

2020 ◽  
pp. 319-332
Author(s):  
Tejaswani Shukla ◽  
Mohit Mistry ◽  
Chandresh Solanki ◽  
Sanjay Kumar Shukla ◽  
Shruti Shukla
Keyword(s):  
Expansive Soils ◽  
Swelling Behaviour ◽  
Waste Tire

scholarly journals Study on the Swelling Behavior of Clayey Soil Blended with Geocell and Jute Fibre

2021 ◽  
Vol 7 (8) ◽  
pp. 1327-1340
Author(s):  
Sanjeev Kumar ◽  
Anil Kumar Sahu ◽  
Sanjeev Naval
Keyword(s):  
Construction Projects ◽  
Clayey Soil ◽  
Expansive Soils ◽  
Fibre Length ◽  
Swelling Pressure ◽  
Swelling Potential ◽  
Swelling Behaviour ◽  
Swelling Properties ◽  
Maximum Decrease ◽  
Mechanically Stabilized

Expansive soils like clays undergo swelling that can both be detrimental and acceptable in different applications. In the Northern part of India, especially Delhi region, natural soils containing clays & clayey sands support most of the buildings. Mechanically stabilized clays mixed with sand are used for local earthwork construction such as roads and landfills. Exact understanding of the swelling behaviour of such soils is a pre-requisite before the start of any construction projects. In this paper the swelling behaviour of clayey soil reinforced with geocell & Jute fibres has been presented. The laboratory investigations include one dimensional swelling tests using California Bearing Ratio (CBR) mould to study the swelling properties for different mix proportions. The maximum decrease in swelling potential of Geocell reinforced specimens was observed at fibre content of 0.80 percent and 40mm fibre length, beyond which increase in the swelling potential and swelling pressure has been observed. With this optimal reinforcement, a reduction of 71.24 percent in swelling and 41.10 percent in swelling pressure has been observed as compared to unreinforced soils. The study provides a solution towards the treatment of expansive soils before starting any construction activity over such soils and a step towards mitigating disasters related to infrastructure facilities grounded on expansive soils. Doi: 10.28991/cej-2021-03091728 Full Text: PDF

Heating effect on swelling behaviour of expansive soils

2008 ◽  
Vol 3 (2) ◽  
pp. 121-127 ◽  
Author(s):  
M. C. Wang ◽  
M. Jao ◽  
M. S. Ghazal
Keyword(s):  
Expansive Soils ◽  
Heating Effect ◽  
Swelling Behaviour
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