Journal of Yangtze River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (1): 146-150.DOI: 10.11988/ckyyb.20191066


Effects of Calcined Muck-Dolomite on Strengths and Expansion Properties of Cement Mortar

CHEN Deng1,2, SONG Xu-yan1, HE Zhi-hai3   

  1. 1. College of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China;
    2. Research Center of Water Engineering Safety and Disaster Prevention of Ministry of Water Resources,Yangtze River Scientific Research Institute, Wuhan 430010, China;
    3. College of Civil Engineering,Shaoxing University, Shaoxing 312000, China
  • Received:2019-09-04 Revised:2020-01-15 Online:2021-01-01 Published:2021-01-27

Abstract: Dolomite was modified through calcination mixed with muck. The effects of calcined muck-dolomite on the strength and expansion properties of cement mortar were investigated. The hydration products of cement containing calcined muck-dolomite were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Results show that β-C2S and C12A7 were generated in calcined muck-dolomite, and the content of β-C2S and C12A7 increased with the rising of calcination temperature. The incorporation of calcined muck-dolomite improves the strengths of blended cement mortar effectively at later age. Cement mortar containing 10% calcined muck-dolomite even gain a higher strength at 90 d than pure cement mortars. In addition, the hydration of MgO in calcined muck-dolomite gave rise to Mg(OH)2, resulting in the expansion of cement mortars, and the expansion rate augmented with the increase of dosage of calcined muck-dolomite. The research finding is of referential value for promoting the application of dolomite in cement concrete and for reducing the pollution of construction wastes.

Key words: muck, dolomite, calcination, strength of cement mortar, expansion properties

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