期刊
NEW CARBON MATERIALS
卷 31, 期 6, 页码 574-584出版社
ELSEVIER
DOI: 10.1016/S1872-5805(16)60033-1
关键词
Graphene oxide; Cement paste; Rheological property; Flocculation structure
资金
- National Natural Sciences Foundation of China [51508020]
- Beijing Educational Commission [KM201510016003]
- Beijing College Innovation Team-building and Teacher Career Development Project [IDHT2013]
The theological properties and morphology of fresh cement pastes with different contents of graphene oxide (GO) were investigated by a rheometer and a laser confocal scanning microscope, respectively. The theological data were fitted by the Modified-Bingham (M-B) model and Herschel-Bulkley (H-B) model. A mechanism for the effect of GO on the rheological properties is proposed. Results sheiw that the cement particles are re-agglomerated and new flocculation structures are generated by the addition of GO. The new flocculation structures significantly alter the rheological properties of the pastes. The degree of re-agglomeration and the number of new flocculation structures increase with increasing GO content, leading to a sharp increase in the yield stress, plastic viscosity and the area of the hysteresis loop. GO can effectively reduce the degree of shear-thickening, and increase the critical shear rate and the stability of the pastes.
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