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Title: The influence of cellulose nanocrystal additions on the performance of cement paste

Source: CEMENT AND CONCRETE COMPOSITES, Volume 56, 2015; pp. 73-83.

Author(s)Cao, Yizheng; Zavaterri, Pablo; Youngblood, Jeff; Moon, Robert; Weiss, Jason

Publication Year: 2015  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-3B

Abstract: The influence of cellulose nanocrystals (CNCs) addition on the performance of cement paste was investigated. Our mechanical tests show an increase in the flexural strength of approximately 30% with only 0.2% volume of CNCs with respect to cement. Isothermal calorimetry (IC) and thermogravimetric analysis (TGA) show that the degree of hydration (DOH) of the cement paste is increased when CNCs are used. The first mechanism that may explain the increased hydration is the steric stabilization, which is the same mechanism by which many water reducing agents (WRAs) disperse the cement particles. Rheological, heat flow rate measurements, and microscopic imaging support this mechanism. A second mechanism also appears to support the increased hydration. The second mechanism that is proposed is referred to as short circuit diffusion. Short circuit diffusion appears to increase cement hydration by increasing the transport of water from outside the hydration product shell (i.e., through the high density CSH) on a cement grain to the unhydrated cement cores. The DOH and flexural strength were measured for cement paste with WRA and CNC to evaluate this hypothesis. Our results indicate that short circuit diffusion is more dominant than steric stabilization.

Keywords: Cellulose nanocrystal; CNC; Degree of hydration; Ball-on-three-ball flexural test; Steric stabilization; Short-circuit diffusion

Publication Review Process: Formally Refereed

File size: 2,607 kb(s)

Date posted: 01/20/2015

This publication is also viewable on Treesearch:  view
RITS Product ID: 71855
Current FPL Scientist associated with this product
Moon, Robert J.
Materials Research Engineer
  

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