详情

原文传递 INTO THE VOID

题名：	INTO THE VOID
正文语种：	eng
作者：	Jim Thompson
作者单位：	Carolina Stalite Company
摘要：	NORTH CAROLINA'S MITCHELL County has several highways that snake through the Black Mountain range of the Blue Ridge Mountains. The range's peaks and valleys, in combination with the county's heavy rainfall, present several safety hazards to motorists. They also pose a danger to road construction crews-a negligent driver could easily collide with professionals or equipment on a blind curve or a steep slope. When it needed to resurface a stretch of highway in this region, the North Carolina Department of Transportation (NCDOT) wanted an asphalt chip seal that could provide safety for motorists during the project and far into the future. NCDOT also wanted to reduce the time crews spent in dangerous areas. NCDOT chose an asphalt chip seal made from an expanded ceramic lightweight aggregate. This type of aggregate, often produced from shale, clay, or slate, has a high friction surface that improves skid resistance over its service life, making the highway safer in the long-term. Additionally, lightweight aggregate provides superior particle retention because of its bond strength. This not only reduces required maintenance for rural roads, resulting in substantial return of investment to the county, but it also protects constituent vehicles during and after construction. Finally, due to the material's low density, asphalt spreaders can more easily pull dump trucks up a grade, accelerating timelines and increasing the overall safety of a project. But how does a lightweight aggregate deliver increased strength and performance capabilities?
出版年：	2023
期刊名称：	Roads & bridges
卷：	61
期：	3
页码：	38-41