Research Activities: 2002

A Study of the Effects of Injected Chemical Soil Stabilizers on Expansive Clays and Claystones




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Sequential Number


Matching Research Agency

Hayward Baker Incorporated

Principal Investigator

Thomas M. Petry
Professor of Civil Engineering
University of Missouri-Rolla
1870 Miner Circle
Rolla, Missouri 65409-0030

Student Involvement

Two students on partial support, 1/2 FTE total

Project Objective

To determine the rate and extent of how injected clay soil chemical stabilization agents improve selected properties of expansive clay soils and claystones. Further study ways to improve the measurement of soil suction in treated clays and improve determination of beneficial reduction in shrinkage as a result of treatment.

Project Abstract

1.Select and sample subject clay soil(s) and claystone(s) for improvement.
2.Determine the basic physical and chemical properties of both the subject soil(s) and claystone(s).
3.Treat the subject materials with chemical agents, using simulated injections.
4.Determine the changes to physical and chemical properties of the subject materials after treatment.
5.Continue research into the use of a new device for measurement of clay soil suction as applied to determine improvements to behavior caused by treatments.
6.Investigate ways to effectively monitor the improvements of clay soil shrinkage that occur as a result of chemical treatments.
7.Provide final project report to Hayward Baker.

Anticipated Benefits

Better understanding of how injected chemical agents can improve the behavior of expansive clay soils and claystones. This will potentially reduce the cost of construction of all types of transportation structures and reduce the damage potential of these problematic soils.

Modal Orientation

All transportation facilities


Project Start Date:09/01/2002
Project End Date:08/31/2003

Relationship to other Research/Projects

Related to other chemical stabilization projects.

Technology Transfer Activities

Final report and publications through TRB

Transportation Research Board Keywords

Expansive soils, clays, chemical stabilization