Journal ArticleDOI
Experimental Studies on Ettringite-Induced Heaving in Soils
Arnold J. Puppala,Arnold J. Puppala,Napat Intharasombat,Napat Intharasombat,Rajan K. Vempati,Rajan K. Vempati +5 more
Reads0
Chats0
TLDR
In this paper, the effects of soil type, lime and sulfate amounts on this type of heaving, and hypothesized threshold levels of chemical ions to form ettringite mineral in treated soils, are addressed.Abstract:
Sulfate-induced heaving in soils is primarily attributed to ettringite formation from the reactions between calcium of a lime or cement stabilizer, reactive alumina in soils, and sulfates in soils. Ettringite formation and subsequent heaving in soils are complex topics that are not well understood. This research is an attempt to advance the state of the knowledge on these topics. Ettringite was successfully synthesized in the laboratory by simulating conditions close to those in chemically treated sulfate-bearing soils. Soils spiked and compacted with the synthesized ettringite did not undergo heaving in one-dimensional free swell tests. However, heaving was observed when ettringite was formed inside the lime-treated soil specimen by including ionic reactions. Mineralogical studies including x-ray diffraction and scanning electron microscope studies were used to evaluate the presence of ettringite. Experimental investigations showed that the ettringite or sulfate-induced heaving was higher in clays than in sands under similar chemistry and environmental conditions. This is attributed to the void sizes of soil types and crystalline ettringite formation in the voids. Also, the effects of soil type, lime and sulfate amounts on this type of heaving, and hypothesized threshold levels of chemical ions to form ettringite mineral in treated soils, are addressed.read more
Citations
More filters
Journal ArticleDOI
Engineering properties and microstructural characteristics of cement-stabilized zinc-contaminated kaolin
TL;DR: In this paper, the authors present details of a study that deals with determination of engineering properties, identification of phases of major hydration products, and microstructural characteristics of a zinc-c...
BookDOI
Characterization of Cementitiously Stabilized Layers for Use in Pavement Design and Analysis
TL;DR: In this article, the characterization of cementitiously stabilized layers and the properties that influence pavement performance are discussed, as well as performance-related procedures for characterizing these layers and performance-prediction models for incorporation into the mechanistic-empirical pavement analysis methods.
Journal ArticleDOI
Addressing Sulfate-Induced Heave in Lime Treated Soils
TL;DR: In this paper, the consequences of treating sulfate laden soils with calcium-based stabilizers are discussed and the nature (chemistry and structure) of the minerals (ettringite/thaumasite) blamed for deleterious reactions and why these structures may lead to damage.
Journal ArticleDOI
The effect of magnesium chloride solution on the engineering properties of clay soil with expansive and dispersive characteristics
TL;DR: In this article, the effect of magnesium chloride (MgCl 2 ) solution on the engineering properties of clay soils was evaluated and the results showed that dispersive and expansive clay soils can be effectively improved using an additive MgCl2 solution.
Journal ArticleDOI
Variables Controlling Stiffness and Strength of Lime-Stabilized Soils
Nilo Cesar Consoli,Luizmar da Silva Lopes,Pedro Domingos Marques Prietto,Lucas Festugato,Rodrigo Caberlon Cruz +4 more
TL;DR: In this paper, the influence of the amount of lime, porosity, and voids/lime ratio on the initial shear modulus (G0) and unconfined compressive strength (qu) of a lime-treated clay-ey sandy soil was quantified.
References
More filters
Book
Chemical equilibria in soils
TL;DR: In this paper, Chemical equilibria in soils, chemical equilibrium in soil, Chemical equilibrium in soils, مرکز فناوری اطلاعات و اشعر رسانی, ک-شاouرزی
Book
Expansive Soils: Problems and Practice in Foundation and Pavement Engineering
John D. Nelson,Debora J. Miller +1 more
TL;DR: Expansive soils: problems and practice in foundation and pavement engineering as discussed by the authors, Expansive soil problems and practices in the field of pavement engineering and foundation and foundation engineering, etc.
Book
Engineering Principles of Ground Modification
TL;DR: Mechanical modification hydraulic modification physical and chemical modification modification by inclusions and confinement.
Journal ArticleDOI
Lime-Induced Heave in Sulfate-Bearing Clay Soils
TL;DR: In this article, the authors found abundant thaumasite, a complex calcium-silicate-hydroxide-sulfate-carbonate-hyd rate mineral, forming a solid solution series with ettringite.
Journal ArticleDOI
Practical problems from surprising soil behavior
TL;DR: In this paper, the aging of quick clay after sampling, the remolded strength increases in samples maintained at constant water content, time effects in freshly densified or deposited sand, in which natural sand deposits can lose strength if disturbed but regain strength over time periods of weeks to months, and apparently sound lime-stabilized soil that swells and disintegrates starting a few years after construction.