TY - JOUR
T1 - Influence of nano-sized highly purified magnesium alumino silicate clay on thixotropic behavior of fresh cement pastes
AU - Quanji, Zhuojun
AU - Lomboy, Gilson R.
AU - Wang, Kejin
N1 - Funding Information:
The authors would like to acknowledge the Oak Ridge Associated Universities (ORAU) – Tennessee Valley Authority (TVA) for sponsoring the present study (Grant No. 7-22976 ).
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/10/30
Y1 - 2014/10/30
N2 - Thixotropic behavior of cementitious materials is attracting much attention due to its important applications in concrete practice, such as formwork pressure, multi-lift casting, slip form paving, pumping and segregation. This study investigates the influences of nano-sized highly purified magnesium alumino silicate clay (3 nm in diameter, called nanoclay) on thixotropic behavior, particularly, the structural rebuilding of fresh cement pastes. In this study, rheological properties (yield stress, viscosity and thixotropy) of cementitious pastes, with and without nanoclay, were measured at every 15 min after the pastes were mixed. Flow table tests were conducted, and the results were compared with those measured from the rheology tests. Statistical methods were utilized to determine the rates of changes in thixotropy with time. The results indicate that a small amount of nanoclay addition (0.5-1% by mass of cement) significantly facilitates particle re-flocculation or structural rebuilding, and effectively enhances the thixotropy of cement pastes.
AB - Thixotropic behavior of cementitious materials is attracting much attention due to its important applications in concrete practice, such as formwork pressure, multi-lift casting, slip form paving, pumping and segregation. This study investigates the influences of nano-sized highly purified magnesium alumino silicate clay (3 nm in diameter, called nanoclay) on thixotropic behavior, particularly, the structural rebuilding of fresh cement pastes. In this study, rheological properties (yield stress, viscosity and thixotropy) of cementitious pastes, with and without nanoclay, were measured at every 15 min after the pastes were mixed. Flow table tests were conducted, and the results were compared with those measured from the rheology tests. Statistical methods were utilized to determine the rates of changes in thixotropy with time. The results indicate that a small amount of nanoclay addition (0.5-1% by mass of cement) significantly facilitates particle re-flocculation or structural rebuilding, and effectively enhances the thixotropy of cement pastes.
UR - https://www.scopus.com/pages/publications/84906088046
UR - https://www.scopus.com/inward/citedby.url?scp=84906088046&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2014.07.050
DO - 10.1016/j.conbuildmat.2014.07.050
M3 - Article
AN - SCOPUS:84906088046
SN - 0950-0618
VL - 69
SP - 295
EP - 300
JO - Construction and Building Materials
JF - Construction and Building Materials
ER -