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The test reports loss of mass to abrasion and impact, expressed as a percentage of initial sample mass. [7] Maximum acceptable loss for the base course of the road is 45%; the more demanding surface course must be 35% or less. [1] The test was developed by the city engineers of Los Angeles in the 1920s. [8]
ASTM C448 Standard Test Methods for Abrasion Resistance of Porcelain Enamels; ASTM C535 Standard Test Method for Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine [7] ASTM C944 Standard Test Method for Abrasion Resistance of Concrete or Mortar Surfaces by the Rotating-Cutter Method
Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. [1] Attempting to scratch a surface to test a material is a very old technique. [2]
The CBR test is a penetration test in which a standard piston, with a diameter of 50 mm (1.969 in), is used to penetrate the soil at a standard rate of 1.25 mm/minute. Although the force increases with the depth of penetration, in most cases, it does not increase as quickly as it does for the standard crushed rock, so the ratio decreases.
Some 6.5 million people in the Los Angeles area were under a critical fire threat as winds were forecast to be 20 to 40 miles (32-64 km) an hour with gusts up to 70 mph and humidity dropping into ...
Abrasion of a flooring sample, tested with the pendulum before and after, is being used to assess “Sustainable Slip Resistance.” Some architects and property owners are now combining this pendulum-based test with situation-specific safety criteria to specify and verify safe flooring.
The R-Value test [1] measures the response of a compacted sample of soil or aggregate to a vertically applied pressure under specific conditions. This test is used by Caltrans for pavement design, replacing the California bearing ratio test. Many other agencies have adopted the California pavement design method, and specify R-Value testing for ...
L.A. County Dist. Atty. Nathan Hochman announced looting charges Monday, and also said one man was charged with arson for starting a blaze in an Azusa park.