Abstract
The author conducted tests on the compacting and unconfined compressive strength and soundness of the soil samples which had been added sodium chloride (0.2-3% weight) and portland cement (3-10% weight).
The compressive strength was measured after these soil samples packed in vinyl film were cured for 6 days at 20°C and were immersed in water for one day. The results obtained from the above tests were as follows;
1) When added sodium chloride and cement, their optimum moisture content decreased, but their maximum dry density increased as compared with the values obtained when none of sodium chloride and cement were added.
2) The degree of compressive strength and dry density increased with addition of sodium chloride, and it showed the maximum value when 1% salt was added.
3) On the execution of soil cement pavement in Hofu City, the addition of 7% cement was required in order to obtain the compressive strength of 30kg/cm2. When sodium chloride was added, however, it was possible to obtain this strength by adding 4.5% cement.
4) As a consequence, it is possible to save about 20% of the cost of construction if sodium chloride is added to soil cement.
