Replacement of Portland cement is a promising application not only in the field of concrete but also in the field of soil improvement, and effect of calcium silicate hydrate is expected to be similar within soil grains. Research on this application of rice husk ash has been carried out more often recently and all of them share the same observation that in cooperation with lime, the mixture can help to considerably improve the strength, permeability, durability and volume stability of different types of soft soil. The main advantage of the lime-rice husk ash cement compared with the Portland cement is that it can save much energy. Detail calculation of comparison between the two systems by a simple Life cycle inventory analysis in the Appendix 1 shows that the electricity used by the system of lime and rice husk ash is only one fifteenth of the amount of the case of Portland cement
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