Properties of supersulphated phosphogysumslag cement (SSC) concrete

Sha Ding, Zhonghe Shui, Wei Chen, Jianxin Lu, Sufang Tian

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)

Abstract

Supersulphated phosphogysum-slag cement (SSC) is a newly developed non-burned cementitious material mainly composed of phosphogysum (PG) and ground granulated blast furnace slag (GGBFS), with small amount of steel slag (SS) and clinker (CL). SSC is a kind of environmentally-friendly cementitious material due to its energy-saving, low-carbon emission, and waste-utilization. We prepared concretes with supersulphated phosphogysum-slag cement, and studied the mechanical properties, microproperties and resistance to chloride penetration of concrete in comparison with those of portland slag cement (PSC) and ordinary portland cement (OPC) concrete. The test results show that the compressive strength of SSC concrete can reach 38.6 MPa after 28 d, close to PSC concrete and OPC concrete. Microanalyses indicate that large quantities of ettringite and C-S-H, and little amount of Ca(OH)2 are generated during the hydration of SSC. The dense cement paste structure of SSC is formed by ettringite and C-S-H, surrounded unreacted phosphogysum. The property of resistance to chloride penetration of SSC concrete is better than PSC and OPC concrete due to the fact that SSC can form much more ettringite to solidify more Cl-.

Original languageEnglish
Pages (from-to)109-113
Number of pages5
JournalJournal Wuhan University of Technology, Materials Science Edition
Volume29
Issue number1
DOIs
Publication statusPublished - Feb 2014
Externally publishedYes

Keywords

  • chloride penetration
  • ettringite
  • supersulphated phosphogysum-slag cement

ASJC Scopus subject areas

  • General Materials Science

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