Highway Embankment Construction Procedure

some heavy clay soils of the A6 and A7 types with tar emul­ sions and cutbacks on an experimental subgrade stabilization during the summer of 1937, we found that this type of soil stabilization presents some very different problems from those of soil-aggregate stabilization. Soil-cement stabilization, as described by Mr. Myers, also presents some interesting problems. According to its claims, the Portland Cement Association can satisfactorily treat any soil, free from organic or other objectionable matter, that has a liquid limit below 40 and a plasticity index below 20. Al­ though the addition of cement changes the physical charac­ teristics of the soil, the compaction in this type of stabilization is quite important. Any of these various forms of stabilization may become somewhat complex and warrant laboratory and field studies of the materials available before the recommended method of treatment is suggested.