Expansive ultra-high performance concrete for concrete-filled steel tube applications

Peiliang Shen, Jian Xin Lu, Haibing Zheng, Linnu Lu, Fazhou Wang, Yongjia He, Shuguang Hu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

36 Citations (Scopus)

Abstract

In this study, an expansive ultra-high performance concrete (UHPC) was prepared by combining use of lightweight aggregate (LWA) and CaO-expansive agent (EA) for concrete-filled steel tube applications. The coupled effects of LWA and EA on the volume stability, mechanical properties and microstructure of UHPC were systematically evaluated. The expansive stress of the outer wall of UHPC-filled steel tube was also determined. The test results showed that the EA and LWA could be effectively combined to produce a high expansive UHPC, and the internal curing effect of LWA mitigated the self-desiccation and promoted the hydration of EA, refining the pore structure of matrix. As a result, the expansive UHPC exhibited high levels of expansion and high mechanical properties. A maximum circumferential expansion of 308 μϵ and triaxial compressive stress of 3.65 MPa at 24 h could be obtained, which compacted the core UHPC and improved the interfacial bond between the steel tube and the UHPC.

Original languageEnglish
Article number103813
JournalCement and Concrete Composites
Volume114
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Expansion
  • Expansive agent
  • Internal curing
  • Shrinkage
  • Steel tube

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science

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