Featured Research

from universities, journals, and other organizations

Pothole Panacea -- Patented Composite Material Repairs Cracks In Pavement

Date:
March 8, 1999
Source:
University Of Illinois At Urbana-Champaign
Summary:
Plagued by potholes? A special composite patented by the University of Illinois -- and now commercially available -- may pave the way to smoother, longer-lasting roads.

CHAMPAIGN, Ill. -- Plagued by potholes? A special composite patented by the University of Illinois -- and now commercially available -- may pave the way to smoother, longer-lasting roads.

Applied to concrete or asphalt surfaces, the material covers cracks like a huge adhesive bandage, reinforcing the surface and preventing the cracks from spreading and causing further damage.

"Seasonal and daily temperature changes are enemies of any road surface," said Barry Dempsey, a U. of I. professor of civil engineering and director of the university's Advanced Transportation Research and Engineering Laboratory. "Low temperatures cause pavement sections to contract, which creates new cracks and widens existing joints and cracks."

A common remedy is to spread a thin asphalt-concrete overlay on the damaged pavement, Dempsey said. "Because the overlay is fully bonded to the pavement, however, stresses cause the cracks to propagate up through the overlay. This 'reflection cracking' not only allows water to percolate into the pavement and weaken the base, but also contributes to rapid deterioration of the overlay."

The U. of I. material is engineered to effectively block the upward propagation of cracks, joints or potholes in existing pavement.

The composite consists of three layers: a low-stiffness geotextile as the bottom layer, a viscoelastic membrane layer as the core, and a very-high-stiffness geotextile as the upper layer. The materials work together to relieve stress at the crack and provide reinforcement to the overlay, thereby preventing the crack from propagating.

The material functions as a base isolation layer in the pavement overlay system, Dempsey said. "When thermal contraction occurs in the underlying pavement, the low-stiffness geotextile -- which is fully bonded to the pavement -- absorbs some of the horizontal movement. The sandwiched viscoelastic membrane layer allows movement between the top and bottom geotextiles, while the high-strength upper geotextile limits the stress in the overlay to which it is firmly bonded."

In 1994, after testing the composite's performance in the laboratory, Dempsey selected a field test site on a state highway near Rochelle, Ill. The composite was placed on a number of cracks and joints in the pavement, and its performance and durability were evaluated over time.

"When we developed this material, our goal was to keep cracks from spreading for three years," Dempsey said. "We have now completed five years of field testing, and the product's performance has surpassed our expectations. The material has effectively reduced the occurrence of reflective cracking by more than 75 percent."

An exclusive license to market the composite has been granted to Contech Construction Products Inc. of Middletown, Ohio.


Story Source:

The above story is based on materials provided by University Of Illinois At Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University Of Illinois At Urbana-Champaign. "Pothole Panacea -- Patented Composite Material Repairs Cracks In Pavement." ScienceDaily. ScienceDaily, 8 March 1999. <www.sciencedaily.com/releases/1999/03/990308054133.htm>.
University Of Illinois At Urbana-Champaign. (1999, March 8). Pothole Panacea -- Patented Composite Material Repairs Cracks In Pavement. ScienceDaily. Retrieved August 20, 2014 from www.sciencedaily.com/releases/1999/03/990308054133.htm
University Of Illinois At Urbana-Champaign. "Pothole Panacea -- Patented Composite Material Repairs Cracks In Pavement." ScienceDaily. www.sciencedaily.com/releases/1999/03/990308054133.htm (accessed August 20, 2014).

Share This




More Matter & Energy News

Wednesday, August 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Flower Power! Dandelions Make Car Tires?

Flower Power! Dandelions Make Car Tires?

Reuters - Business Video Online (Aug. 20, 2014) Forget rolling on rubber, could car drivers soon be traveling on tires made from dandelions? Teams of scientists are racing to breed a type of the yellow flower whose taproot has a milky fluid with tire-grade rubber particles in it. As Joanna Partridge reports, global tire makers are investing millions in research into a new tire source. Video provided by Reuters
Powered by NewsLook.com
Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Awesome New Camouflage Sheet Was Inspired By Octopus Skin

Newsy (Aug. 19, 2014) Scientists have developed a new device that mimics the way octopuses blend in with their surroundings to hide from dangerous predators. Video provided by Newsy
Powered by NewsLook.com
Researcher Testing on-Field Concussion Scanners

Researcher Testing on-Field Concussion Scanners

AP (Aug. 19, 2014) Four Texas high school football programs are trying out an experimental system designed to diagnose concussions on the field. The technology is in response to growing concern over head trauma in America's most watched sport. (Aug. 19) Video provided by AP
Powered by NewsLook.com
Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

Green Power Blooms as Japan Unveils 'hydrangea Solar Cell'

AFP (Aug. 19, 2014) A solar cell that resembles a flower is offering a new take on green energy in Japan, where one scientist is searching for renewables that look good. Duration: 01:29 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins