![]() Using concrete for building structures and infrastructure can contribute to the emission of carbon dioxide. The most notable of the long-lived greenhouse gases are carbon dioxide and methane. The International Panel on Climate Change (IPCC) reports that the increase in the concentration of many compounds in the atmosphere will impact global climate. ![]() The topic of global climate change is frequently in the news. Read more on why we use aggregates in concrete. The maximum size of the coarse aggregates is generally in the range of 3/8 to 1 ½ inches. Coarse aggregate consists of either (or a combination of) gravel, crushed gravel, crushed stone, air-cooled blast furnace slag, or crushed concrete, with particles generally larger than 0.2 inches. Fine aggregate consists of natural sand, manufactured sand, or a combination thereof with particles that are typically smaller than 0.2 inches. Aggregates are classified by ASTM C33 (AASHTO M 6/M 80) as fine or coarse.
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