Popular among road builders and Department of Transportation agencies across the United States, plant-mixed cement treated base is used to enhance road foundations when poor subgrade conditions are encountered.
Cement treated base (CTB) allows contractors to create a strong base for pavement projects with specified minimum durability and strengths requirements. Pavements with CTB are much stronger and more rigid than an unstabilized, granular base. Its slab-like characteristics and beam strength are unmatched by granular bases that fail when aggregate interlock is lost. This happens when wet subgrade soil is forced up into the base by traffic loads. Hard, rigid CTB is practically impervious. It resists cyclic freezing, rain, and spring-weather damage. CTB continues to gain strength with age, even under traffic. This reserve strength accounts in part for CTB’s excellent performance.
What is Cement Treated Base?
Cement treated base is a strong, frost resistant base for concrete or asphalt pavements. CTB is a type of soil cement consisting of native soils, gravels, or manufactured aggregates and measured amounts of cement and water. CTB can be mixed in place with onsite soils or mixed in a central plant or pugmill depending on project requirements. Plant-mixed cement treated base is most common and preferred by Department of Transportation agencies.
When to Use Cement Treated Base
CTB is widely used as a base course for flexible and rigid pavement – providing a stiffer, stronger base than unbound aggregate. A stiff base reduces deflections attributable to traffic loads, which results in lower strains in the pavement surface. This delays the onset of surface distress and extends pavement life. It is suitable as a base for asphalt pavements or subbase for concrete pavements for:
- Mainline highways
- High-volume streets and local roads
- Residential streets
- Heavy industrial, intermodal, and military facilities
- Airport runways, taxiway, and aprons
- Parking lots
Advantages of Plant-Mixed Cement Treated Base
Mixing base material, cement, and water at a central mixing plant shortens haul distance and the time it takes to deliver the material to the pavement area. Properly calibrated mixing plants producing uniform mixtures and are equipped with feeding and weighing systems that proportion the ingredients as specified by quality control officials. Additional advantages include:
- Lower cost through use of local aggregates
- Eliminates subgrade infiltration into base
- Fast construction
- Reduced moisture susceptibility
- Frost resistant
- Spans weak subgrades
Equipment Recommendations for Plant-Mixed Cement Treated Base
RWC Equipment Leasing recommends Rapidmix mobile pugmill plants for high volume, accurate CTB production. Depending on the Rapidmix model, material can be produced at speeds up to 600 tons per hour using volumetric measurement or continuous weigh systems.
If you plan on using plant-mixed cement treated base for your next pavement project, consider the benefits of leasing or renting a Rapidmix mobile pugmill from RWC Equipment Leasing. For more information, call Bobby Carroll at (561) 400-3204.