Tire Rubber Modified Asphalt Emulsion for Effective Pavement Preservation

SPONSOR: MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY

PI:  Zhanping You

This project will evaluate the feasibility of GTR-emulsion and activated rubber for pavement chip seal. The feasibility study includes the emulsification and performance evaluation of GTR-emulsions, and trial field sections of chip seals for GTR-emulsions and/or activated rubber. The project will be considered successful if the following results are obtained:

(1) GTR-emulsion and ARMA is successfully prepared and its performance is evaluated in laboratory. Its properties meet the requirements of each standard. The comparison between regular-emulsion and modified emulsions is made for performance evaluation.
(2) GTR-emulsion and activated rubber chip seals are successfully prepared and the performance is evaluated through the laboratory paving of chip seals. The life cycle cost analysis of chip seals is used to evaluate the ROI and the comparison between GTR-emulsion chip seal and others will be made.
(3) The road trial sections of GTR-emulsion and activated rubber chip seals are successfully implemented.

Zhanping You
Zhanping You
Qingli Dai
Qingli Dai

Low Emission Asphalt Pavements with Crumb Rubber

SPONSOR:  MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY

PI:  Zhanping You

This project will conduct comprehensive evaluations on the CRM WMA for pavements in the State of Michigan.  The main objective of this project is to develop and apply low emission asphalt pavement technology through the combination of crumb rubber and warm mix asphalt and to evaluate the feasibility of CRM WMA with respect to performance improvement, emission reduction, and cost effectiveness. The performance of CRM WMA will be evaluated through laboratory and field testing. The emission reduction will be assessed through laboratory and plant emission measurements. The environmental impact of the CRM asphalt mixtures will be evaluated through LCA, while the cost effectiveness will be evaluated through LCCA.

The evaluation includes performance improvements, emission reduction, life cycle environmental impact assessment, and life cycle cost analysis. If it shows that the CRM WMA is a feasible option after the evaluation, it is anticipated the CRM WMA can have more applications in the future. And therefore a sustainable market for scrap tires can be developed in Michigan. In this project, we anticipate the CO2 output for the designed materials will be reduced by up to 30% and other volatiles will be reduced by up to 30% as well, while the engineering parameters of the pavement meet or exceed the pavement agency’s goal.

Zhanping You
Zhanping You

Incorporating Surface-Treated Rubber Particles into Portland Cement and Geopolymer Concrete to Improve Field Performance

SPONSOR:  MICHIGAN DEPARTMENT OF ENVIRONMENTAL QUALITY

PI: Qingli Dai

The reuse of scrap rubbers in Portland cement concrete has attracted many interests of researchers and practitioners in the recent decade. These practical efforts can reduce the environmental impact and save energy and resources for cement and aggregate production. In addition, the rubber-modified cement concrete have improved mechanical features, reduced weight, increased durability and toughness and decreased brittleness. Especially, the mixed crumb rubbers will introduce the uniformly distributed “elastic particles”, which have similar size-distribution as the air-­entrained air voids to reduce internal stress for the improved freeze-thaw durability. In addition, the “green” geopolymer cement will be specially prepared by using alkali-activated reaction of fly ash and recycled glass powder for reduced CO2 emission and improved durability.

This project will develop a two-stage treatment approach for rubber particles to increase the material stiffness and rubber cement or geopolymer paste bonding strength. The developed techniques will facilitate the utilization of scrap rubber as fine particles in Portland cement and geopolymer concrete.

Qingli Dai
Qingli Dai
Shiyue Fang
Shiyue Fang

Fiber-reinforced High Performance Rubber Concrete for Concrete Structure Construction and Repair

Sponsor:  Michigan Department of Environmental Quality (MIDEQ)

PI:  Qingli Dai

In the recent decade, the resuse of scrap tire rubbers in  concrete has attracted much interests of researchers and practitioners.  The practical efforts can reduce the environmental impact.  In general, the rubber-modified concrete can improve static and dynamic fracture toughness and decrease brittleness.  Particularly, the mixed rubber particles (mesh size #10-#30) will introduce the uniformly distributed “elastic entrained particles”, which can release internal expansive stress due to freeze-thaw damage and chemical attack for improved durability.  In addition, the surface-treated rubber particles have good bonding strength with cement paste. Continue reading “Fiber-reinforced High Performance Rubber Concrete for Concrete Structure Construction and Repair”