DYNASTONE GENERATION 2
PIPE AND MANHOLES

For over a hundred years the effectiveness of many wastewater collection and treatment systems has been significantly reduced by corrosion. This corrosion is primarily caused by the generation of sulfuric acid that is produced by the oxidation of hydrogen sulfide gas. To combat this corrosion, Dynastone formulated a new acid-resistant material that has excellent economics and is easy to fabricate using traditional production techniques.

Dynastone Generation 2 pipes and manholes are corrosion resistant products able to resist attack from sulfuric acid. A chemically activated high volume fly ash mixture that greatly improves the durability of the product. Fly ash is an integral part of the Dynastone technology. To clearly define it, the majority of the cement used in a standard concrete mix design is removed and replaced with a large volume of high quality fly ash and a proprietary activator. This activator reacts with the mix to bond the material together. Simply put, Dynastone uses a different glue than conventional pipe

Accelerated Acid Test
In order to provide a reliable indicator of long-term performance in a sanitary sewer, Dynastone used a test method developed by the concrete pipe industry and independent testing laboratories. This test subjected the material to severe conditions and an accelerated corrosion process. Specifically, the test method involves acid immersion of the product and brush tests.

Test cylinders are totally immersed in a 1.0 pH sulfuric acid solution for a minimum of thirty cycles. Each cycle consists of a 24-hour soak in the acid bath, followed by removal, rinsing and scrubbing of the surface of the test cylinders. The cylinders are then weighed and put back into the acid bath that has been replenished to a 1.0 pH. At the conclusion of 30 cycles at least one of the cylinders is compression tested to assure that the material has maintained its strength for the duration of the test. Finally, to determine the ultimate limits of each material being tested, the cylinders are taken to the point of complete failure in the acid bath.

Economics:
Dynastone Generation 2 pipe provides excellent economics and is extremely cost effective. The material cost is slightly more than that of conventional concrete pipe. However, the increased structural considerations over PVC pipe and the extended service life over conventional concrete pipe make it easily justifiable. When compared to PVC type pipes, Dynastone pipe will be able to compete on an even footing. When compared to PVC lined concrete pipe, the cost savings can be almost half that of the lined product since PVC lining isn’t necessary with a Dynastone product.

Why use Dynastone Generation 2 Pipe?
• The pipe is rigid and structural in nature. Pipe embedment is important, but with Dynastone 95% of pipe envelope strength is in the structure of the pipe. Dynastone gives the owner the strength of concrete with acid resistance of plastic.
• The pipe is economical. With engineered bedding required only to the springline of the pipe, less aggregate is required. Dynastone is price competitive with the alternative plastic products. This allows a safer rigid structural pipe to be used in lieu of the alternative.
• The need for PVC lined concrete pipe is no longer necessary.
• A pozzolanic reaction occurs. Although the reaction is somewhat different when compared to an ordinary Portland cement mix, it creates an inert product.
• All facilities fabricating Dynastone Pipe will be required to be American Concrete Pipe Association certified plants.

Why use Dynastone Generation 2 Manholes?
• The long term structural capacity of the manhole is significantly enhanced over that of an ordinary concrete manhole. The acid resistance helps eliminate the concern over the loss of wall thickness due to corrosion. Consequently, the structural and load characteristics remain more constant.
• Dynastone manhole material is economical and cost effective. The additional cost is minimal when compared to the additional life of the manhole. There are additional cost savings because Dynastone manholes do not need to be lined or coated.
• Smaller manhole sections lowered into a larger existing manhole allow Dynastone manhole products to be used as a retrofit on projects were excessive corrosion has already occurred. This saves the owner from completely replacing the existing structure.
• A pozzolanic reaction occurs. Although the reaction is somewhat different when compared to an ordinary Portland cement mix, it creates an inert product.
• All facilities fabricating Dynastone manhole material will be required to be American Concrete Pipe Association or National Precast Concrete Association certified plants.

Forward Sample - Conventional Concrete (18 Months) Back Sample - Dynastone Concrete (18 Months)