The raw soil used for soil-cement shall be free from deleterious contents, such as the organic matter of vegetable origin, mica, etc. Generally, black cotton soil shall not be used due to economic considerations. Soil shall conform to the following requirements- Sand content, percent by mass- 35, min Plasticity index, percent- 8.5 to 10.5 Total soluble salts, percent by mass- 1, max Sodium salts, percent by mass- 0.1, max Liquid limit, percent- 27, max