Landscape Contractor / Design Build Maintain

JAN 2018

LC/DBM provides landscape contractors with Educational, Imaginative and Practical information about their business, their employees, their machines and their projects.

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50 LC DBM I n f o r m a t i o n R e q u e s t # 4 4 1 ASTM International has published a standard for a new material used as an expan - sion joint filler for sidewalks, driveways, curbs, and other concrete construction. Labeled D8139 – 17, the specification is for a semi-rigid, closed-cell polypropylene foam that has suitable compressibility, recovery from compression, is non-extruding and weather-resistant. To purchase the standard, contact ASTM International's customer relations (877-909-ASTM or ). In assessments to determine the factors that most affect storm - water runoff reduction in areas where permeable pavement is installed, the results cited the hydraulic conductivity of the subgrade as one of the most influential. Also it was found that in the long run, permeable pavement performed better in a rela - tively drier climate; reducing 90% of runoff compared to 70% in a relatively wetter climate. These conclusions could help in the design and implementation of permeable pavement. The Concrete Polishing Council of the American Society of Concrete Contractors has released revisions to two charts - Polished Concrete Aggregate Exposure Chart and the Polished Concrete Appearance Chart. Changes to the Aggregate Expo - sure Chart, which were precipitated by concerns that contrac- tors were not cutting into the floor deep enough to reveal the proper sized aggregate, eliminates the medium aggregate surface exposure, and the approximate surface cut depths for all classes. The revised Polished Concrete Appearance Chart now bases final appearance on Distinctness-of-Image and haze index instead of on the finished gloss of the floor, which many believed could be easily manipulated. New Standard for Concrete Paving Joint Filler Permeable Pavement Features Put to the Test Refining the Look of Polished Concrete I n f o r m a t i o n R e q u e s t # 4 3 2

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