Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Modelling Ettringite Induced Heaving in Cement Stabilized Soils within a Chemo-Mechanical Constitutive Framework
Several recent construction projects in Northeast Ohio have experienced significant sulfate induced heaving in cement stabilized soils. It is well known that the reaction between the sulfate and alumina in soils and calcium of a lime or cement stabilizer often leads to the formation of ettringite, an expansive sulfate mineral that may contribute to the expansion. This subject has been extensively researched in the past but most of the studies have been focused on the experimental aspects. This paper presents a numerical approach to understanding the observed heaving in stabilized soils. A chemo-mechanical constitutive model is employed to address the chemically induced swelling strain. Kinetics of gypsum water reaction is used to explore the evolutionary processes involved. A number of important studies have shown that multiple mechanisms may be involved in addition to formation of ettringite. Consequently, in the present study, numerical simulations are performed to explore different scenarios characterized by different predominant mechanisms. The results have shown that ettringite formation and osmosis swelling can act as separate dominant mechanisms or play comparable roles in this heaving process.
Modelling Ettringite Induced Heaving in Cement Stabilized Soils within a Chemo-Mechanical Constitutive Framework
Several recent construction projects in Northeast Ohio have experienced significant sulfate induced heaving in cement stabilized soils. It is well known that the reaction between the sulfate and alumina in soils and calcium of a lime or cement stabilizer often leads to the formation of ettringite, an expansive sulfate mineral that may contribute to the expansion. This subject has been extensively researched in the past but most of the studies have been focused on the experimental aspects. This paper presents a numerical approach to understanding the observed heaving in stabilized soils. A chemo-mechanical constitutive model is employed to address the chemically induced swelling strain. Kinetics of gypsum water reaction is used to explore the evolutionary processes involved. A number of important studies have shown that multiple mechanisms may be involved in addition to formation of ettringite. Consequently, in the present study, numerical simulations are performed to explore different scenarios characterized by different predominant mechanisms. The results have shown that ettringite formation and osmosis swelling can act as separate dominant mechanisms or play comparable roles in this heaving process.
Modelling Ettringite Induced Heaving in Cement Stabilized Soils within a Chemo-Mechanical Constitutive Framework
Sigdel, Pawan (Autor:in) / Hu, Liang Bo (Autor:in)
IFCEE 2015 ; 2015 ; San Antonio, Texas
IFCEE 2015 ; 125-132
17.03.2015
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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