Abstract
Long-term immersion(200 d) test of red clay-cemented soil composite was carried out in oxalic acid aqueous solutions with p H value of 2.5, 3.5 and 4.0. Through monitoring the changes of acid consumption and the variation of appearance of the test composite with time to reveal the corrosion behavior and the relevant mechanism of red clay- cemented soil composite in the oxalic acid. Results shows that the corrosion of the composite in the oxalic acid is a process related closely with sub-processes of decomposition and recrystallization, i.e. the hydration products of cement and Fe2O3 in the red clay-cemented soil composite are decomposed and then recrystallized into indissolvable Ca C2O4 and Fe C2O4, and finally the skeleton like connectors of the red clay- cemented soil were transformed into other products such as calcium oxalate and ferrous oxalate.
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