High Performance
Cantwell Bridges
Overview
2003 - ACT provided quality control on batching procedures for silica-fume concrete used on overlays on 3 bridges near Cantwell, on the Parks Hwy. Materials were supplied by super bags and bulk by another ready-mix producer.
Dutch Harbor Bridge Deck
Overview
2006 - ACT provided consulting and quality control services on batching silica fume concrete in near-freezing temps for bridge deck at Dutch Harbor which is on Unalaska Island in the Aleutians. Local aggregates were used with cement getting shipped in super bags. Water had to be heated in a tank truck for batching and admixes with silica-fume were added by hand.
High Performance
Overview
We have extensive experience in producing high-performance concrete, or concrete using silica fume and superplasticizers to achieve strengths in excess of 10,000 psi. We have developed mix designs and produced concrete with strengths over 12,000 psi in extreme winter conditions and in remote areas. We also provide consulting services for quality control to contractors or other ready-mix suppliers around the state as a manufacturer’s rep for silica fume suppliers.
Seward Lowell Creek Tunnel Reconstruction
Overview
In 2003 Alaska Concrete Technologies provided 350 yards of 12,000psi+ silica-fume concrete during extreme winter conditions for the Lowell Creek Tunnel Relining in Seward. Even though Seward has ready-mix plants, they did not have suitable aggregates, or experience to procuce 10,000 psi concrete.
Pre-weighed super bags were filled with specially screened aggregates by ACT in Anchorage, and then trucked 150 miles to Seward, along with bags of cement, and admixes. The bags had to be covered and heated and then batched with heated water to produce the high-strength concrete in sub-freezing temperatures.
A portion of the approach flume to the tunnel had water running through porous rocks underneath, creating hydrostatic pressure forcing water up the wall and out cracks. A special expanding grout was used to fill the void and seal off the water.
