Properties of Different Types of Concrete Containing Peat Ash


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Title: Properties of Different Types of Concrete Containing Peat Ash

Author(s): Aino Heikkinen

Publication: Special Publication

Volume: 114


Appears on pages(s): 539-552

Keywords: ashes; compressive strength; concretes; corrosion resistance; peat; saturation; shotcrete; workability; Materials Research

Date: 5/1/1989

Summarizes exploitation of peat ash in normal structural concrete and air-entrained concrete. Shotcrete is also presented as a special use of peat ash. These peat ash-containing concretes are made on a continuous production basis. The batch plant is equipped with an automatic dosage control system, and the doses of ingredients are stored in a computer memory. Subsequently, all dosage information is available for follow-up checks. These production batches were studied by preparing test castings. Two different types of peat ash were used. Owing to their difference in density, they are referred to as heavy ash and light ash. These differ from one another in terms of chemical and physical properties and thus offer different possibilities of utilization. Practical results and test results indicate that both types of peat ash can be used successfully as a replacement for portland cement in making different kinds of concrete. Use of peat ash calls for the concurrent use of a plasticizer or superplasticizer. When using light peat ash and an air-entraining agent, a special stabilizing agent must be used so that the air voids produced will remain in the concrete. The use of peat ash in concrete imparts good workability properties to the fresh concrete and a good strength development to the hardened concrete. The corrosion resistance of the concrete is improved compared with normal sulfate-resistant concrete.