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Chemo-Mechanical Approach to Modelling the Expansive Behavior of Sulfate Bearing Soils: The Role of Crystallization Pressure in Ettringite Formation
Significant amount of heaving in cement stabilized sulfate bearing soils had been observed in recent construction projects in Northeast Ohio, USA. It is well known that the reaction between sulfate and alumina in soils and calcium of a lime or cement stabilizer can cause the formation of ettringite, an expansive sulfate mineral which may contribute to heaving. The crystallization pressure during the ettringite formation plays a significant role in the soil expansion. This paper presents a numerical approach to modelling the potential heaving in stabilized sulfate-bearing soils with a specific focus on the role of the crystallization pressure in ettringite formation. Evolution of kinetic rates of involved chemical reactions is simulated for the time-dependent process of crystal growth and crystallization pressure development addressed by Correns’ equation. A micro-mechanical formulation is used to simulate the induced expansive strain. The presented simulations are able to reveal the characteristics of the evolution of sulfate concentration, ettringite crystal growth, crystallization pressure as well as expansive strain. A parametric study of the effect of temperature is also presented.
Chemo-Mechanical Approach to Modelling the Expansive Behavior of Sulfate Bearing Soils: The Role of Crystallization Pressure in Ettringite Formation
Significant amount of heaving in cement stabilized sulfate bearing soils had been observed in recent construction projects in Northeast Ohio, USA. It is well known that the reaction between sulfate and alumina in soils and calcium of a lime or cement stabilizer can cause the formation of ettringite, an expansive sulfate mineral which may contribute to heaving. The crystallization pressure during the ettringite formation plays a significant role in the soil expansion. This paper presents a numerical approach to modelling the potential heaving in stabilized sulfate-bearing soils with a specific focus on the role of the crystallization pressure in ettringite formation. Evolution of kinetic rates of involved chemical reactions is simulated for the time-dependent process of crystal growth and crystallization pressure development addressed by Correns’ equation. A micro-mechanical formulation is used to simulate the induced expansive strain. The presented simulations are able to reveal the characteristics of the evolution of sulfate concentration, ettringite crystal growth, crystallization pressure as well as expansive strain. A parametric study of the effect of temperature is also presented.
Chemo-Mechanical Approach to Modelling the Expansive Behavior of Sulfate Bearing Soils: The Role of Crystallization Pressure in Ettringite Formation
Sigdel, Pawan (author) / Hu, Liang Bo (author)
Fourth Geo-China International Conference ; 2016 ; Shandong, China
Geo-China 2016 ; 159-166
2016-07-21
Conference paper
Electronic Resource
English
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