The inspector plays a vital role on every construction project ensuring that the completed operations comply with the plans and specifications. Base stabilization is similar to FDR; therefore, ARRA's Basic Asphalt Recycling Manual (BARM) and their best practice guidelines for FDR, along with the documents listed under Additional Resources should be consulted as guides.
When chemical modification is being applied to dry and improve the workability of a soil as a construction expedient, mix designs and detailed inspection is not typically required. The chemical modifying agent is applied and mixed until the desired drying/workability is obtained.
With soil modification/stabilization, like most paving projects, the primary goal is to produce a strong, durable subgrade or subbase course that is ready to receive the final pavement section. Inspectors can help achieve this goal by ensuring that the process is in accordance with the contract documents as follows:
Mix Design: Verify representative samples were obtained throughout the project and that a mix design(s) was performed by a qualified lab resulting in a mixture that meets or exceeds the contract documents.
Surface Preparation: Walk or drive the entire project section to recieve soil modification/stabilization for the day to ensure the area has been properly prepared and that all pre-construction repairs have been performed.
Acceptable Weather: Measure the air temperature and check conditions for anticipated heavy rainfall and freezing weather to determine if construction can start/continue.
Traffic Control: Verify that the proper traffic control is in place to keep the traveling public safe during construction.
Application Rates: Periodic checks should be made to verify that the amount of modifying/stabilizing agent added to the subgrade is within allowable tolerances.