Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Why do they spray tar on the old road before they pave?

April 26, 2017pave road spray tar

0

Posted

Why do they spray tar on the old road before they pave?

1 Answer

0

Posted

The substance sprayed on the old pavement is a liquid asphalt called tack. It is a mixture of asphalt & water or asphalt & solvent. It is heated so it can be sprayed. Its main purpose is to bond the old pavement with the new.