Abstract: The stabilized tests of three combinations (pure cement, cement+metakaolin and cement+metakaolin+sodium silicate) were carried out to study the improvement effect of metakaolin on cement stabilized red clay. Based on the component content of the stabilization agent, the dry density, pH value and mineral composition of the stabilized soil, the stabilization mechanism of metakaolin on cement stabilized red clay was stu-died under the action of a new composite alkali excitation system. The results showed that when the contents of cement, MK and sodium silicate were 12%, 5% and 3%, respectively, the stabilized effect of red clay was the best, and its strength was 2.82 times higher than that of pure cement stabilized soil. When n(SiO2)/n(Al2O3) increased from 2.53 to 4.05, the unconfined compressive strength of stabilized soil developed rapidly, and then tended to stable gradually. As Ca2+ generated by cement hydration could balance part of the negative charge in the stabilizing system, the strength of the stabilized soil had been improved significantly when n(Na2O)/n(Al2O3) was small. Finally, through the micro-morphology and main phase composition of the stabilized soil, it is found that the sample of the new composite alkali activation system contains amorphous geopolymer gel and the characteristic peak value of the main minerals decreases, indicating that more geopolymerized gel products are produced.
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2024, Vol. 38 
