Use of magnesia sand for optimal design of high performance magnesium potassium phosphate cement mortar

Yan Shuai Wang, Jianguo Dai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

In this paper, reactive magnesia sand is employed to replace conventional inert quartz sand as the fine aggregate of MKPC mortar, to adjust the M/P (i.e. MgO-to-KH2PO4) molar ratio of cement paste during mortar formation, as well as to improve the mortar performance though strengthening the bonding capacity of the interfacial transition zone (ITZ) (i.e. the paste to aggregate interface). Experimental results showed that the compressive strength of the MKPC mortar with reactive magnesia sands could achieve a mean value of 36.65 MPa at 12 h, and outperformed about 27.30% than that with inert quartz sand at 28-day. The interfacial transition zone (ITZ) development in the MKPC mortar with magnesia sands was investigated using the on-site X-ray computed tomography (CT). The failure modes of specimens subjected to uniaxial compression were analyzed and visualized by means of image processing technique. In addition, the chemical interaction between the paste and the aggregate was theoretically and experimentally analyzed, explaining well the excellent volume stability of the MKPC mortar with reactive magnesia sands.
Original languageEnglish
Pages (from-to)385-392
Number of pages8
JournalConstruction and Building Materials
Volume153
DOIs
Publication statusPublished - 30 Oct 2017

Keywords

  • ITZ
  • Magnesia sand
  • Mechanical properties
  • MKPC mortar

ASJC Scopus subject areas

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

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