10/14/2023 0 Comments Astm standards for concrete![]() ![]() ![]() ![]() A new cement was developed that consists of over 90-percent fly ash and anhydrous CaSO4. A few highly cementitious ashes were used to make concrete without portland cement. The replacement of 15 to 25 percent by mass of portland cement in concrete is examined. This study discusses test results of several ashes according to ASTM: C 618, Standard Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete. However, in many Western States fly ashes have cementitious properties as well as pozzolanic properties, and they are capable of producing good strengths without portland cement. Historically, fly ash has been referred to as a pozzolan and is used to reduce the amount of portland cement in concrete. Fly ash is a residue that results from the combustion of ground or powdered coal.
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