Monday, May 2, 2011

Paving the newest stretch of Loop 303

A look at the new stretch of Loop 303.
The final concrete pavement is 10 inches thick.
The countdown is on!

It won’t be long before drivers in the West Valley get to experience the newest section of Loop 303, otherwise known as the Bob Stump Memorial Parkway.

Stretching between Happy Valley Parkway and Interstate-17, the 14-mile segment opens this month and represents just the start of improvements slated for Loop 303. Later this week we’ll delve deeper into what the future holds for this freeway, but for now, we want to focus on one of the steps involved in the detailed process of building a road … today we’re talking about concrete!

This four-lane segment of the 303 contains almost 800,000 square yards of concrete pavement in just the roadway alone. But instead of purchasing and hauling concrete from an outside source, contractors on this project mixed their own on site using three portable concrete plants.

Portable plants are a huge time and money saver. They require only one person to operate (typically a few people will assist in loading material), and once the plants are fired up, they produce roughly 300 cubic yards of concrete an hour. According to one estimate, mixing on site saves about 20 percent over what it would cost to purchase from a commercial plant.

And not only did they mix the concrete at the project site, but some of the material that went into the actual concrete and roadway base (the layer of material between the dirt on the ground and the concrete) was mined on site, too. ADOT’s contractor was able to crush and use 500,000 tons of rock for the roadway base. By recycling materials on site, more than 37,000 truck trips were eliminated.

But how do they make the concrete? Well, if you can imagine mixing a giant cake, you can visualize how concrete is made.

First the contractor has the components – cement, flyash, aggregate and water – delivered and placed in stockpiles around the plant. The material is then loaded onto a conveyor belt and weighed by a computer before being placed in the mixer.

In just a minute and a half the concrete is ready to be loaded onto a transport vehicle and then placed on the roadway.
Posted by Angela DeWelles   |  Labels:  Construction, Loop-303, Portable-Concrete-Plant, Valley-Freeways


Civil RightsTitle VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA)
  • Pursuant to Title VI of the Civil Rights Act of 1964, and the Americans with Disabilities Act (ADA), ADOT does not discriminate on the basis of race, color, national origin, age, sex or disability. Persons that require a reasonable accommodation based on language or disability should contact ADOT’s Civil Rights Office at 602.712.8946 or at Requests should be made as early as possible to ensure the State has an opportunity to address the accommodation.
  • De acuerdo con el título VI de la Ley de Derechos Civiles de 1964 y la Ley de Estadounidenses con Discapacidades (ADA por sus siglas en inglés), el Departamento de Transporte de Arizona (ADOT por sus siglas en inglés) no discrimina por raza, color, nacionalidad, edad, género o discapacidad.  Personas que requieren asistencia (dentro de lo razonable) ya sea por el idioma o por discapacidad deben ponerse en contacto con la Oficina de Derechos Civiles al 602.712.8946 o en Las solicitudes deben hacerse lo más pronto posible para asegurar que el equipo encargado del proyecto tenga la oportunidad de hacer los arreglos necesarios.