01023510

Component

https://doi.org/10.3141/1936-07

http://scholar.google.com...alli&publication_year=2005

The use of calcium-based stabilizers such as calcium oxide (lime) in sulfate-bearing clay soils has historically led to structural distress because of the formation of a mineral called ettringite and possibly thaumasite. In trying to control the damage associated with such formations, engineers have attempted to determine a threshold level of soluble sulfates—a quantity that is relatively easy and quick to measure at which significant ettringite growth and, therefore, structural distress occurs. This is indeed a complex problem related to not only soil composition but also construction methods, availability of water, ion migration, and the ability of the void structure to accommodate the expansive mineral growth. Unfortunately, experience alone and rules-of-thumb based on experience are not sufficient to deal with this complex issue. Thermodynamic geochemical models of the lime-treated soil can be used as a first step toward establishing thresholds for problematic levels of soluble sulfates for a specific soil. A foundation for the model development is presented, and two soils are compared to illustrate their sensitivities to ettringite growth on the addition of lime. Because the model predicts ettringite growth on the basis of site-specific properties, the model can be used to assess the potential amelioration effects of soluble silica.

01023507

English

pp 51-59

2005

Transportation Research Record: Journal of the Transportation Research Board

0309094100

Print

Figures (9) ; References (46) ; Tables (2)

Calcium oxide; Clay soils; Ettringite; Geochemistry; Mathematical models; Sulfates; Thermodynamics

Thaumasite

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB, ATRI

Apr 26 2006 9:22AM

• Accelerated Strength Improvement of Silty Sand with Nontraditional Additives
• Approach to Evaluating Damage from Thermal Bridge Displacements
• Comparison of the Bidirectional Load Test with the Top-Down Load Test
• Cyclic Plate Load Testing of Geosynthetic-Reinforced Unbound Aggregate Roads
• Design of Ribbed Concrete Approach Slab Based on Interaction with the Embankment
• Development and Application of a Rut Prediction Model for Flexible Pavement
• Development of Methodology to Include Structural Contribution of Alternative Working Platforms in Pavement Structure
• Development of U.S. Army Corps of Engineers Engineering Guidance for the Barge Impact Design of Navigation Structures
• Early-Age Strength Assessment of Cement-Treated Base Material
• Evaluation of Liquefaction Potential Using Neural Networks Based on Adaptive Resonance Theory
• Field Installation and Pullout Test of Embedded Suction Anchors
• Full-Scale Experimental Measurement of Barge Impact Loads on Bridge Piers
• Geogrid-Reinforced Pile-Supported Railway Embankments : A Three-Dimensional Numerical Analysis
• Improvement of the Geotechnical Axial Design Methodology for Colorado’s Drilled Shafts Socketed in Weak Rocks
• Improving Effectiveness and Reliability in Geotechnical Investigations with a Personal Digital Assistant
• Modeling Water Flow Patterns in Flexible Pavements
• Performance of an Induced Trench Installation
• Permeability of Base Material for Maine Roads
• Pore Pressure Measurement in Blast-Induced Liquefaction Experiments
• Practical Approach to Criteria for the Use of Lime–Fly Ash Stabilization in Base Courses
• Real-Time Compaction Monitoring in Cohesive Soils from Machine Response
• Reliability Analysis of Cracking and Faulting Prediction in the New Mechanistic–Empirical Pavement Design Procedure
• Stabilization Techniques for Unpaved Roads
• Structural Contribution of Geosynthetic-Reinforced Working Platforms in Flexible Pavement
• Use of Microcracking to Reduce Shrinkage Cracking in Cement-Treated Bases