On May 23, 2010, the fourth OBSI measurement of the I-355 NB Next Generation Concrete Surface (NGCS) and Completely Decomposed Granite (CDG) Test sections was conducted. Both sections tested at 100.7 dBA. After 31 months of traffic on NGCS and CDG test sections, there is little change in noise levels.

On June 19, 2010 OBSI testing was conducted on 10 of the texture test sections constructed as part of the NCHRP 10-67 research and one additional test section constructed for ACPA. After 32 months of traffic on 11 test sections, diamond grinding surfaces were the quietest.

As a result of research conducted by Purdue University, and the recent successful demonstration of this texture at MnROADS, two 600 ft. long diamond grinding sections were constructed on the Chicago I-355 project currently under construction b K-5 Construction Corporation. The purpose of the I-355 test sections was to further evaluate the constructability of the new texture and to place the textures on a roadway which would be open to traffic.

As requested by Caltrans Headquarters, Holms and Narver prepared this report on sampling and analysis of concrete grinding residue associated with the diamond grinding operation of roadway surfaces for reconstruction. The project activity involved grinding the pavement surface of an approximately 32-mile long segment of Route 8 near El Centro, CA in Caltrans District 11 from PM 41.0 to PM 73.0. Both fresh water and slurry samples (filtrate and solid) displayed no hazardous characteristics when compared to the California Title 22 hazardous waste standards.

Concrete Grinding Residue (CGR) is a slurry waste consisting of water and concrete fines generated from diamond grinding operations that is used to smooth a concrete pavement surface. During this process, CGRs are mostly disposed along the roadside, which can influence soils and plant communities along the roadways. After investigation, CGR was not found to be a long term concern to roadside environments

Joint filling, joint sealing and leaving pavement joints open (unsealed) are the three main approaches to joint sealant. This bulletin discusses the proper consideration of joint sealants and fillers, and provides details on proper installation. Joint resealing is necessary during concrete pavement preservation activities.