Compressive strength of compacted portland cement-based mixtures using phosphogypsum

Kuo Ting Lin, Antonio Nanni, Wen F. Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Industrial and mining wastes, often extremely finegrained, are being used as fillers and binders in structural concrete and consolidation by compaction, as opposed to high-frequency vibration, enhances the engineering properties of these mixes. Impact and static compaction can be industrially used for the automatic production of building elements such as bricks and blocks, whereas roller compacted concrete is more suitable for field applications. The aim of this paper is to present compressive strength characteristics under air-dry, sealed and soaked conditions of Portland cement mixtures containing a complete range of combinations of dihydrate phosphogypsum (by-product of the phosphate fertilizer industry) and fine aggregate (crushed lime rock). Cylindrical specimens were prepared according to the Modified Proctor procedure (impact compaction). Based on these results, strength comparisons are made for selected constituent proportions in the cases of: 1) consolidation by static compaction; 2) consolidation by high-frequency vibration; 3) site consolidation by vibratory roller compactor; 4) substitution of the dihydrate phosphogypsum with the hemihydrate form (other available by-product). It is shown that consolidation by compaction is particularly advantageous because of the contribution of phosphogypsum to strength development. Laboratory compacted samples of the byproduct alone indicate that strengths of over 1,000 psi (6.89 MPa) can be achieved. In addition, low cement (7.5%) mixtures using hemihydrate gypsum waste exceed the 4,000 psi (27.56 MPa) mark.

Original languageEnglish (US)
Title of host publicationConsolidation of Concrete
PublisherAmerican Concrete Institute
Pages57-76
Number of pages20
ISBN (Electronic)9780870317248
StatePublished - Jan 1 1987

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-096
ISSN (Print)0193-2527

Keywords

  • Compacting
  • Compressive strength
  • Consolidation
  • Gypsum
  • Phosphoric acids
  • Portland cements
  • Roller compacted concrete
  • Vibration
  • Wastes

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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