Structural Lightweight Concrete with Combined Grain and Matrix Porosity

This paper describes how, until now that there have been two ways to produce structural lightweight concrete: concrete with porous aggregates (mostly used in lightweight concrete nowadays) and concrete with porous matrix (with very different levels of porosity used for several applications). The strength of concrete with porous components depends on the lowest component-strength, and because of different effects in the transition zone between matrix and aggregates the strength is often even lower. In order to optimize the ratio of weight and strength it is possible to combine porous matrix and porous aggregates. For best results it is important to coordinate matrix strength and aggregate strength to make the material homogeneous and to avoid peaks in the internal stress distribution. Therefore, it is necessary to find a method to specify the optimum matrix attributes and to find a way to produce such a matrix unerringly. Here the use of foamed concrete seems to be the most efficient. By applying foam it is possible to modify the matrix properties in such a way as to minimize negative influences on fresh and hardened concrete, such as the floating of aggregates and shrinking, etc.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 547-566
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010813
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 2:43PM