COMPARATIVE CHARACTERISTICS OF REACTIVE POWDER CONCRETES USING FLY ASH AND MICROSILICA

Leonid Dvorkin, Vadim Zhitkovsky, Yuri Ribakov

Research output: Contribution to journalArticlepeer-review

Abstract

Reactive powder concrete (RPC) is an efficient type of fine-grained concrete with extreme strength and durability characteristics. The use of RPC allows the construction of such unique objects as pedestrian and automobile bridges, thin-walled architectural forms, protective structures, hazardous waste storage facilities, etc. Obtaining RPC provides for the mandatory use of a significant amount of microsilica as an active mineral additive, which is not always available for use. The article presents the results of comparing the strength characteristics of RPC obtained on microsilica and with its complete replacement with fly ash activated by milling with sodium silicate fluoride. The studies were carried out using mathematical planning of the experiment. Experimental-statistical models of RPC water demand and compressive and flexural strength at different ages have been obtained and analyzed. It is shown that the use of activated ash in the RPC makes it possible to obtain concrete with a strength of 100…110 MPa in 28 days. A method for calculating the composition of the RPC using the obtained models is proposed.

Original languageEnglish
Pages (from-to)306-315
Number of pages10
JournalRevista Romana de Materiale/ Romanian Journal of Materials
Volume53
Issue number4
StatePublished - 2023

Keywords

  • concrete mix composition
  • design
  • experimental-statistical model
  • fly ash
  • microsilica
  • planning of experiments
  • reactive powder concrete
  • strength

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