Two new standards from the Geosynthetics committee of ASTM will help define properties that can be used in the design of geosynthetic reinforced pavement. I know in my practice in Arizona, ADOT simply allows a boost of Resilient Modulus (R-Value) of 10 when biaxial geogrids are used. Perhaps in time this will lead to a design method to account for the geosynthetic reinforcement in a more analytical way. [Source: Geosynthetics Magazine]
November was a big month for updates to ASTM Standards…84 updates to be more specific. Several that caught my attention were D4546 One-Dimensional Swell or Settlement Potential, D7383 – Standard Test Methods for Axial Compressive Force Pulse (Rapid) Testing of Deep Foundations (a new standard), several standards that might affect shotcrete design and a large number of water testing standards. Read on for the list.
In this month’s ASTM updates, there is a new standard for determining the laboratory density of soil specimens. Not having a standard for this item was a common problem for us in our practice. The lab would give us a density on ring samples by weiging, drying and weighing again using the known volume of the rings, but there was never any standard to go with it. Other updates this month include ones related to dimension stone, fiber reinforced concrete, sulfate content of soils, and calcium and magnesium content of water.