WANG Qin, WANG Jian, LU Chun-xiang, CUI Xin-you, LI Shi-yu, WANG Xi. Rheological behavior of fresh cement pastes with a graphene oxide additive. New Carbon Mater., 2016, 31(6): 574-584. doi: 10.1016/S1872-5805(16)60033-1
Citation: WANG Qin, WANG Jian, LU Chun-xiang, CUI Xin-you, LI Shi-yu, WANG Xi. Rheological behavior of fresh cement pastes with a graphene oxide additive. New Carbon Mater., 2016, 31(6): 574-584. doi: 10.1016/S1872-5805(16)60033-1

Rheological behavior of fresh cement pastes with a graphene oxide additive

doi: 10.1016/S1872-5805(16)60033-1
Funds:  National Natural Sciences Foundation of China (51508020); Beijing Educational Commission (KM201510016003); Beijing College Innovation Team-building and Teacher Career Development Project (IDHT2013).
  • Received Date: 2016-08-15
  • Accepted Date: 2016-12-26
  • Rev Recd Date: 2016-12-10
  • Publish Date: 2016-12-28
  • The rheological 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 rheological 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 show 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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