Compaction is one of the most important processes in roadway construction. Pavement materials must be compacted to optimum densities to ensure adequate support, stability, and strength—achieving these densities uniformly is the key to long lasting roadway performance. Current procedures using conventional compaction equipment and spot location density testing may result in inadequate and/or non-uniform material densities. Inadequate compaction is one of the major factors in premature pavement failure.
Intelligent Compaction In California
Intelligent Compaction (IC) was included in the list of FHWA 2013-2014 Every Day Count initiatives (EDC-2). The first demonstration project in California was conducted on I-80 eastbound lanes in Solano, CA in 2013. In 2014, Caltrans developed two IC non-standard specifications for use in construction of hot mix asphalt (HMA) and Cold In Place Recycling (CIR) along with design guidance to assist Caltrans designers in adapting IC specification to meet project specifics. Currently the use of IC in construction of CIR is mandatory. The use of IC in construction of the thin lift HMA overlay of CIR is also mandatory while in other cases is highly recommended. In California, IC is considered as a quality control tool. The contractor is responsible for every aspects of IC including equipment, data collection and analysis, and reporting.
Since 2014, Caltrans has awarded over 100 IC pilot projects. Caltrans continues to evaluate the use of IC on Caltrans projects. You can find a list of past and current Caltrans Intelligent Compaction projects here:
Intelligent Compaction In Construction Of Hot Mix Asphalt
Intelligent compaction rollers are used in compaction of hot mix asphalt for breakdown and intermediate compaction for method compaction process and for density required HMA. Continue reading about Intelligent Compaction (PDF)
Intelligent Compaction in Construction Of Cold In-Place Recycling
Cold In-Place Recycling (CIR) is an on-grade method of pavement rehabilitation that consists of milling the existing asphalt concrete pavement to a depth between 2 to 4 inches; mixing. Continue reading about CIR (PDF).
Caltrans Intelligent Compaction Non Standard Special Provision (NSSP)
Caltrans has developed two NSSP for IC work.
- IC HMA
If you need a copy of the NSSP, please contact Ragu Thangavelautham at (916) 227-5705.
Caltrans Intelligent Compaction Forms
Use the following forms with projects dated after July 1, 2016
Hot Mix ASPHALT (HMA)
Use the following intelligent compaction test strip procedure to establish HMA intelligent compaction target values:Intelligent Compaction Hot Mix Asphalt Test Strip Procedure (PDF)
The following is a sample test strip report that meets the requirements of the intelligent compaction HMA specifications:
The following is a sample of compaction quality control report that meets the requirements of the intelligent compaction HMA specifications:Sample Intelligent Compaction Hot Mix Asphalt Compaction Quality Control Report (PDF)
Cold-in-Place Recycling (CIR)
Use the following intelligent compaction test strip procedure to establish CIR intelligent compaction target values:
The following is a sample test strip report that meets the requirements of the intelligent compaction CIR specifications:
The following is a sample compaction quality control report that meets the requirements of the intelligent compaction CIR specifications:Sample Intelligent Compaction Cold-In-Place Recycling Compaction Quality Control Report (PDF)
Intelligent Compaction Guidance
Guidance documents are intended for use by Caltrans engineers.
Use the following design guidance to determine if intelligent compact can be used on a project and to assist in editing the specifications:
Intelligent Compaction Construction Guidance
Use the following construction guidance to administer Caltrans intelligent compaction specifications:Intelligent Compaction Construction Guidance (PDF)
Caltrans specification requires that all Intelligent Compaction Technicians (ICT) must be in possession of a valid certification of completion of an approved Caltrans training program. The ICT training consists of the followings;
- Intelligent Compaction Data Analysis
- Intelligent Compaction Equipment
Intelligent compaction quality control compaction technician must complete both trainings.
The individuals attending the trainings will receive certificate of completion of training. The certificate is not intended as a proof of proficiency. The contractor is ultimately responsible for quality of workmanship and accuracy of analysis according to Caltrans intelligent compaction specifications.
Frequently Asked QuestionsYour may find answers to your questions here:
Useful Intelligent Compaction Related Links
Contact Ragu Thangavelautham
Phone: (916) 227-5705