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CMD Group, formerly Reed Construction Data and Construction Market Data, is a provider of business information for the North American construction industry. CMD is owned by ConstructConnect. Its historical roots lie in Construction Market Data, founded in 1982 to publish construction leads and market data.
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]
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction. Traditionally, it includes natural materials such as sand, gravel, crushed stone. As with other types of aggregates, it is a component of composite materials, particularly concrete and asphalt.
[1] [2] There are thousands of aggregate-producing companies in the US, operating in each of the 50 states, and employing 105,000 people. Most aggregate is used by the construction industry, where it is an essential raw material and the main ingredient in concrete and asphalt concrete .
Construction Data Company, is a publisher of business information which caters to the commercial construction industry. They are also known as CDC News and CDC Publishing , and are the third largest provider of commercial SaaS construction reports in the United States , next to Dodge Report and Reed Construction Data .
Aggregate data is high-level data which is acquired by combining individual-level data. For instance, the output of an industry is an aggregate of the firms’ individual outputs within that industry. [1] Aggregate data are applied in statistics, data warehouses, and in economics. There is a distinction between aggregate data and individual data.
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The company was founded in 1963 as a division of Centex Construction Company. Between April 1994 and January 30, 2004, the company was known as Centex Construction Products, Inc. [ 1 ] On January 30, 2004, Centex distributed its shares in the company to its shareholders and the company was renamed Eagle Materials Inc. [ 2 ] [ 3 ]