Effect of Carbonic Acid on Unconfined Compressive Strength of Lime Admixed Clay
Keywords:lime admixed clay, unconfined compressive strength, carbonic acid, curing period
Objectives: This research was aimed at studying the effect of carbonic acid on unconfined compressive strength of the lime admixed clay. The clay sample used in this study was kaolin. The tests were performed on the lime mixed clay samples with the lime content ranging from 10 to 50 percent by dry mass and carbonic acid solution content ranging from 0 to 30 percent by mass of lime content surplus.
Methods: The unconfined compression tests were performed in accordance with ASTM D1633 to find the optimum lime content and the unconfined compressive strength of lime admixed clay samples with different carbonic acid solution contents and curing periods.
Results: The test results showed that the optimum lime content was 30 percent by dry mass. The test on the sample with lime content surplus of 10% (lime content 40%) showed an increase in unconfined compressive strength with curing period in all cases. Moreover, the strength of lime admixed clay samples decreased with increasing carbonic acid solution content. However, adding carbonic acid solution improved strength of lime admixed clay sample at curing period of 28 days.
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