All recycled tire rubber can serve as a feedstock for rubberized asphalt, which is seen as sustainable product, reveals Redmond Clark, leader of Asphalt Plus during the latest Clemson University Global Tire Conference in South Carolina.

It is necessary to work on the dry method for crumb rubber modified asphalt, he adds.

The prevailing number of recycled rubber fails to be used in sustainable way, thus all parties need to shift their focus towards applying this environment-friendly technology, says Clark.

He believes that this chance should not be wasted as it can be too late, because unsustainable businesses may try to keep up with or even outperform the companies who opt for recycled materials.

Recycled tires in the form of crumb rubber are in demand in the asphalt sector, as 6 billion pounds of this sustainable material are used annually in the United States.

Currently, no more that 2% of market’s capacity is used, as only 120 million pounds of recycled rubber are applied in production of dry crumb rubber modified asphalt (CRM).

The practice of dry process CRM was adopted more than a decade ago, which has seen approximately 4 million tons being dealt with. According to Clark’s data, the product is used in road construction in multiple countries and even in 1000 lane miles of highway in South Carolina.

However, before this success of CRM road construction, a number of projects had failed greatly in 90s, as local highway companies lacked adequate expertise and equipment. The horrifying outcomes have led to incineration of rubber.

The U.S. Tire Manufacturers Association is extremely involved in providing assistance to dry process producers. Eight American states have already reached final stages of allowing dry process rubber. Moreover, the EU, China and some Middle Eastern states have already reached them as well.

Clark is hopeful that the tire recycling sector will attempt to standardize dry process CRM within the industry, so it will be preferred to SBS, a more popular option which relies on polymers.

However, Clark notes that dry CRM has greater workability at low temperatures, thus workers can carry out road construction during the winter.

He urged for finding methods to bring changes to the industry that will result in more extensive application of the method on the market.

Article by Recycling International