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Specify – November 2018

Specify – November 2018

Sludge thickener for wastewater

Centrisys Corporation said its Centrisys/CNP THK sludge thickener offers lower life cycle costs, less or zero polymer, higher G-volume for higher capacity, and less redundancy, as well as up to 50 percent less power consumption compared with standard dewatering centrifuges. The THK sludge thickener is designed and built specifically to thicken both primary and waste activated sludge using the fundamental principles of a centrifuge, dissolved air flotation thickener (DAFT), and rotary drum thickener. According to Kenosha Water Utility, a THK200 installed in 2011 replaced four DAFT units, operated 24/7 using no polymer, and achieved 5 percent TS cake and 95 percent capture.

Centrisys Corporation


Structural steel connections

Simpson Strong-Tie introduced the Yield-Link connection to simplify and streamline structural steel connections made in the field without compromising structural strength. The Yield-Link connection requires no field welding, resulting in reduced onsite labor costs, licensing fees, and construction time. The Yield-Link is designed to absorb forces in a seismic event, and as a bolted connection, is easier to replace than welded beams and posts, greatly simplifying repairs following a natural disaster. Software plugins and design support services are available. The Yield-Link is a prequalified connection for steel special moment frames in ANSI/AISC 358-16 and is code listed in ICC-ES ESR-2802.

Simpson Strong-Tie


Thin-asphalt overlay guide

The National Asphalt Pavement Association’s Thinlays for Pavement Preservation provides guidance on the use of thin asphalt overlays as part of a pavement preservation program. Thinlays, a suite of thin-asphalt overlays designed specifically for pavement preservation, provide road owners with a cost-effective way to preserve pavement life, correct minor distresses, and improve the performance and life of a road. Thinlays for Pavement Preservation provides guidance on the proper use of Thinlays, including how they fit within pavement management systems, when and how they should be used based on existing pavement condition, how Thinlay mixes should be developed and specified, and best practices for Thinlay construction.

National Asphalt Pavement Association