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In the United States, there are at least 275 million used tires on the market.

In this article, we are going to discuss the tire rubber cement in asphalt pavers.

asphalt cement

The practice of dumping used tires in landfills has sparked environmental concerns.

Many industries, as well as local and federal environmental protection organizations, have launched significant tire recycling initiatives to address this issue.

Rubberized asphalt is a product made from crumb rubber and is one of the most common uses for recycled scrap tires.

Rubberized asphalt is created by combining ground tire rubber with asphalt in order to improve its properties for highway construction. 

GTR can be used in place of aggregate or as part of asphalt rubber binder, seal coat, cap seal spray, joint and crack sealant, and sealant (rubber-modified asphalt concrete).

As a result, asphalt rubber is the largest single market for GTR, consuming approximately 12 million tires per year.

Several Departments of Transportation in the United States currently prohibit GTR in asphalt mixtures.

A lack of information, laboratory test results, specifications, or unique rules governing the use of GTR in asphalt pavements is one reason for this.

The goal of this study is to compile the wealth of available information, identify areas for future research, and document the key findings of previous relevant studies that specifically addressed the use of GTR in asphalt.

The use of GTR in asphalt mixes, wet and dry processes, characterization of GTR-containing hot mix asphalt (HMA), and GTR performance when combined with virgin materials were all important study findings.

They consisted of laboratory test results, field observations, and best practices.

To promote the successful use of GTR, it is critical to assist DOTs in developing specifications/special provisions for using rubberized asphalt by gathering information, standard operating procedures, and specifications used by other state DOTs.

We conducted a survey of the construction specifications used by various DOTs that currently permit the use of GTR in asphalt as part of this effort.

Because some DOT practices are not easily accessible in the open literature, this survey proved to be a useful tool for gathering information on current DOT practices, methods, and specifications related to GTR use in asphalt pavement.

In the United States, the annual generation of scrap tires increased from 200 million in the 1980s to 300 million in the 2010s, and it has continued to rise every year since.

This is because of the expected increase in vehicle numbers.

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