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2nd Nanjing Bridge

New SF Bay Bridge video

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Fremont Bridge video

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Epoxy Asphalt video

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Epoxy Asphalt Polymer Concrete

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Epoxy Asphalt China

China Vice Construction Minister Dr. Huang Wei and Bob Gaul discuss future bridge deck projects.

 

Latest News:

ChemCo Systems Epoxy Asphalt was recently installed on several steel deck bridges in China inlcluding the Chongqi Br. in Qidong in 2011. After 38 years of service, the Epoxy Asphalt on the Fremont Bridge in Portland was replaced (see link above).

For 2010, Jiaozhou (Qingdao) Bay Bridge (2 separate cable stay spans), Eastern Hubei (E-Dong) Yangtze River Bridge and Jingyue Yangtze River Bridge Between Hubei and Hunan).

2009 projects included China, Thailand and Viet Nam locations.

China bridges were the YuZui Bridge in Chongqing, the BaLinghe Bridge in Guizhou, the Baishazhou Bridge in Wuhan and the XiangLuoWan Bridge in Tianjin.

In DaNang, Viet Nam, the Thuan Phuoc Bridge over the Han River, was completed midyear. This is Viet Nam's first long span steel decked suspension bridge.

In Bangkok, Thailand, several short span bridges were paved including Rama IV, Pong Pech and Banpald.

2008 projects included:

Huangpu Bridges (cable-stay and suspension) in Guangzhou, Xihoumen and Jintang Bridges in Zhoushan and the 3rd Yellow River Bridge in Jintan. The Xihoumen Bridge is now the world's second longest span suspension bridge.

2007 projects included:

Sutong Bridge, Hangzhou Bay Bridge, Yangluo Bridge, and Houhai Bridge. Sutong Bridge is the world's longest span for a cable-stay design. Other new bridges in Tianjin include the FuMin, ChiFeng, Li GongGluo and SiHai Bridges.

 


Epoxy Asphalt Concrete is a polymer concrete with a 46 year history as an extremely durable bridge deck surfacing. Since 1967 over 450 million pounds (225,000 tons) have been installed on bridge decks totaling over 120 million square feet. Installations have exhibited excellent performance, Epoxy Asphalt Golden Gateincluding the San Francisco-Oakland Bay Bridge where 280,000 vehicles travel each day. The 3/4 inch (19 mm) overlay surface has withstood more than 37 years of extremely heavy use (over 3 billon vehicles since installed).

In July 2013, Epoxy Asphalt was placed on the orthotropic steel deck of the new $6.4 billion East Span of the San Francisco Bay Bridge (opens in fall 2013, pictures below). There is a new Caltrans Youtube video on this project. This ultra high performance pavement is also in a phase 3 evaluation by the International Transport Forum of OECD in a multi-country research program seeking long life pavements for strategic roads.

new bay bridge cable Epoxy Asphalt on steel deck new bay bridge

Features

Epoxy Asphalt's most common applications are: 1) as a thin overlay (3/4 to 2 inch thickness) lightweight wear course for repair, replacement or new construction and 2) as a paving surface for orthotropic steel decks** where toughness and elastic composite behavior are critical. Several bridges have used Epoxy Asphalt chipseals as wear surfaces during bridge deck replacements. A newer use of Epoxy Asphalt is as an extremely durable binder for open graded pavements. Other benefits include:

> Low porosity prevents deck corrosion
> Superior substrate adhesion (pavement stays bonded at high ambient temperatures)
> Extreme durability and flexibility
> Can be installed as thin overlay (3/4") if added weight is critical
> Roadway open after 2-4 hours (light traffic)
> 3-4 times stronger than conventional asphalt concrete
> Won't rut or shove, even with heavily overloaded trucks
> Won't oxidize and harden upon aging like regular asphalt
> Lightweight aggregate OK if very low pavement weight is needed
> Negligible cure shrinkage
> Bond coat and binder will not melt
> Applied with conventional asphalt paving equipment

What is Epoxy Asphalt?

Epoxy Asphalt Concrete is a polymer concrete that is composed of a slow curing, Epoxy Asphalt binder mixed together with standard asphalt concrete aggregates in the pug mill of an asphalt plant. The Epoxy Asphalt binder is a two-phase chemical system in which the continuous phase is a thermoset epoxy and the discontinuous phase is a mixture of specialized asphalts. A hot spray application of an Epoxy Asphalt bond (tack) coat precedes the laying of the Epoxy Asphalt Concrete. Epoxy Asphalt concrete is applied and compacted with conventional asphalt concrete paving equipment. The pavement is quickly ready for traffic in its partially cured state once it has cooled to ambient temperature. It develops full strength over two to four weeks depending on ambient temperatures.

Shell Oil Company developed the first generation of Epoxy Asphalt in the late 1950's as a jet fuel and jet blast resistant specialty pavement for airfield applications. In 1967, Epoxy Asphalt was selected for its first commercial application on a bridge deck as the wear surface of the mile long orthotropic steel deck span of the San Mateo-Hayward Bridge across San Francisco Bay. This deck is still in excellent condition after 46 years. Today, ChemCo Systems provides experienced manfacturing, R&D and technical service and continues to improve the performance with new generations of Epoxy Asphalt, particularly for flexible decks, extreme climates and very heavily loaded trucks. Epoxy Asphalt may also be referred to as Epoxy Bitumen or Bitumen Modifed Epoxy in countries outside of North America.

Physical Properties

The two-phase Epoxy Asphalt binder is a thermoset polymer, that is, it will not melt after it has cured. This is a significant advantage of epoxy asphalt because conventional asphalts are thermoplastic polymers that readily melt at elevated temperatures (which can lead to delamination failures). Fresh laid Epoxy Asphalt pavement is not subject to rutting or shoving because the polymeric curing process is advanced during batching to a state of high stability. Thus, the dense-graded mix can be designed with a low void content without the danger of bleeding or flushing. The result is an extremely waterproof pavement that can be opened quickly.

Substrates

Epoxy Asphalt has excellent adhesion with the following substrates:

> Portland Cement Concrete
> Lightweight concrete
> Steel (zinc-primed and unprimed)
> Asphaltic Concrete and chip seals
> Tar-Rubber Concrete
> Epoxy Asphalt
> Epoxy overlays

Epoxy Asphalt Sutong Bridge
*Orthotropic steel deck sections are also called orthotropic box girders.
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