Resilient Modulus of Liquid Chemical-Treated Expansive Soils
Diluted acids are used as chemical stabilizers in Texas to treat expansive soils for residential projects via deep injection. Due to the proprietary nature of the chemical stabilizers, there are very limited studies on the resilient modulus (MR) of chemically-treated expansive soils. This paper evaluates the effect of a liquid chemical stabilizer on the treatment of expansive soils collected from Texas and Colorado. The chemical solution, called ionic soil stabilizer (ISS) which contain sulfuric acid, phosphoric acid, citric acid, and water was used as an additive and tests were carried out on untreated and treated bulk soil samples in accordance with AASHTO T-307. The treated soil specimens were prepared by hand mixing the dry soils with the chemical stabilizer at three application ratios and two curing periods (7 and 28 days). The experiment results show that the value of resilient modulus increases with the increase of chemical application ratio. The resilient modulus of the treated sample cured for 28 days is much higher that of the untreated sample. Also, MR test results were found to be highly dependent on the compaction, moisture content, chemical ratio and curing time. Finally, MR test results are compared with compressive strength obtained from UCS test to find out the optimum treatment chemical dosage for field application.
KeywordsResilient modulus Unconfined compressive strength Liquid chemical stabilizer Ionic soil stabilizer
The authors would like to appreciate TX Prochemical to provide the testing ISS and Mr. Ben Baker for the help of soil sample collection for this study.
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