Salt expansion inhibitors for sulphated salty soil

The sulphated salty soil has the characteristics of water soluble depression, strength, salt expansion and frost heave decrease. However, for the traditional reinforcement materials such as cement and lime, because the reaction $SO^{2-}_{4}$ in soil with cement generates Aft·32H₂O, the increase of solid expansion, the loss of strength and the decrease of durability are easily caused. For the above problems, the self-developed curing and cement are used to improve the saline soil, and the effect of curing and salt content conditions on the expansion and mechanical properties of saline soil is analyzed. The results show that the ability of SD curing to inhibit the expansion and to maintain the strength is better than that of cement. When the salt content is 2%, the expansion ratio decreases by 65.2% to 83.4%, and the compressive and flexural strength increase by 2 to 6 times. When the salt content is 5%, the expansion ratio decreases by more than 88.5%, and the compressive and flexural strength increase by 1.6 to 4.7 times. It is shown that low content has a strong inhibitory for the expansion ratio in medium saline soil. Contrarily, higher adding has better effectiveness on heavy salt soil. The durability is analyzed by the salt solution stability tests and freeze-thaw tests. SD curing can effectively improve the durability of stabilized soil and reduce the loss rate of strength. For the stability of frost resistance, it has a certain inhibitory effect on the frost heave, but has little effect on the stability of strength, which exhibits “Hysteresis” under the corresponding temperature.