Cement-Treated-Base (CTB)

Cement-treated base (CTB) is a strong, frost and moisture resistant base for a concrete or asphalt
pavement wearing surface. CTB consists of gravels or manufactured aggregates blended with prescribed quantities of cement and water. CTB can be mixed in-place with on-site soils or mixed in a central plant or pug mill depending on the project requirements. Typical cement contents range from 3 to 10 percent, resulting in 7-day unconfined compressive strengths from 300 to 800 psi. The mixed-in-place construction process consists of the following steps:
• Initial shaping and grading
• Compacting and fi ne grading
• Application of cement
• Curing
• Mixing water and
cement with soil