SWRC Modelling Framework for Evaluating Volume Change Behavior of Expansive Soils

2012 ◽  
pp. 221-228 ◽  
Author(s):  
Aravind Pedarla ◽  
Anand J. Puppala ◽  
Laureano R. Hoyos ◽  
Sai K. Vanapalli ◽  
Claudia Zapata
Keyword(s):  
Volume Change ◽  
Expansive Soils ◽  
Modelling Framework ◽  
Change Behavior ◽  
Volume Change Behavior

Improvement of Strength and Volume-Change Properties of Expansive Clays with Geopolymer Treatment

2021 ◽  
pp. 036119812110018
Author(s):  
Rinu Samuel ◽  
Anand J. Puppala ◽  
Aritra Banerjee ◽  
Oscar Huang ◽  
Miladin Radovic ◽  
...  
Keyword(s):  
Volume Change ◽  
Carbon Dioxide Emissions ◽  
Expansive Soils ◽  
Linear Shrinkage ◽  
Plasticity Index ◽  
Specimen Preparation ◽  
Expansive Clays ◽  
Change Behavior ◽  
Volume Change Behavior ◽  
Lower Carbon

Expansive soils are conventionally treated with chemical stabilizers manufactured by energy-intensive processes that significantly contribute to carbon dioxide emissions globally. Geopolymers, which are synthesized from industrial byproducts rich in aluminosilicates, are a viable alternative to conventional treatments, as they are eco-friendly and sustainable. In this study, a metakaolin-based geopolymer was synthesized, and its effects on the strength and volume-change behavior of two native expansive soils from Texas, with a plasticity index over 20 were investigated. This paper elaborates on the geopolymerization process, synthesis of the metakaolin-based geopolymer, specimen preparation, and geopolymer treatment of soils. Comprehensive material testing revealed two clays with a plasticity index over 20. They were each treated with three dosages of the metakaolin-based geopolymer and cured in 100% relative humidity for three different curing periods. The efficiency of geopolymer treatment was determined by testing the control and geopolymer-treated soils for unconfined compressive strength (UCS), one-dimensional swell, and linear shrinkage. Field emission scanning electron microscope (FESEM) imaging was performed on the synthesized geopolymer, as well as on the control and geopolymer-treated soils, to detect microstructural changes caused by geopolymerization. A significant increase in UCS and reduction in swelling and shrinkage were observed for both geopolymer-treated soils, within a curing period of only 7 days. The FESEM imaging provided new insights on the structure of geopolymers and evidence of geopolymer formation in treated soils. In conclusion, the metakaolin-based geopolymer has strong potential as a lower-carbon-footprint alternative to conventional stabilizers for expansive soils.

Volume Change Behavior of Natural Expansive Soils Subjected to Acid and Alkali Contamination

2020 ◽  
Vol 20 (11) ◽  
pp. 06020030
Author(s):  
Dongxing Wang ◽  
Yiying Du ◽  
Leena Korkiala-Tanttu ◽  
Zengfeng Zhao
Keyword(s):  
Volume Change ◽  
Expansive Soils ◽  
Change Behavior ◽  
Volume Change Behavior

scholarly journals Experimental investigation of soil blended with lime and lignosulphonate

2018 ◽  
Vol 7 (2.25) ◽  
pp. 74
Author(s):  
Soundarya M.K ◽  
Bhuvaneshwari S ◽  
Prasanna Kumar.S
Keyword(s):  
Expansive Soils ◽  
Research Work ◽  
Expansive Soil ◽  
Pozzolanic Reaction ◽  
Clay Particles ◽  
Bearing Strength ◽  
Pulp Industry ◽  
Saw Dust ◽  
Change Behavior ◽  
Volume Change Behavior

The deterioration of the structures which are built on the expansive soils is due to its volume change behavior, due to the presence of Mont-morillonite minerals in soil. Hence this soil requires adequate stabilization before commencement of any construction activities. The stabili-zation phenomenon in which addition suitable additives completely alters the behavior of the soil by changing the basic properties and there-by increasing the bearing strength of soil. The choice of the additives depends on the ease and permanence of the stabilizing characteristics achieved for the expansive soil. In this paper, an attempt is done to evaluate the behavior of soil when blended with additives like saw dust ash, lime and lignosulphonate at varying blending ratio. The objective of the research work is to focus on the change in the plasticity charac-teristics by utilizing the industrial waste as additive due to its cementitious value, making it eco-friendly and reduction in cost. Lignosulpho-nate is a by-product of paper pulp industry, generated during the sulphite process. From the literature, the optimum percentage for stabilizing works for lime and lignosulphonate was found to be two to eight percent and one to three percent respectively. Basic Index properties and compaction characteristics test were determined for both virgin and treated soil. The additives decreased the plasticity index, causing ag-glomeration of clay particles involving pozzolanic reaction. 

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