Immobilization of Cr(VI) by hydrated Portland cement pastes with and without calcium sulfate

2018 ◽  
Vol 342 ◽  
pp. 242-251 ◽  
Author(s):  
Mingtao Zhang ◽  
Changhui Yang ◽  
Min Zhao ◽  
Linwen Yu ◽  
Kai Yang ◽  
...  
Keyword(s):  
Portland Cement ◽  
Calcium Sulfate ◽  
Cement Pastes

scholarly journals Development of calcium sulfate–ggbs–Portland cement binders

2009 ◽  
Vol 23 (1) ◽  
pp. 340-346 ◽  
Author(s):  
Brian O’Rourke ◽  
Ciaran McNally ◽  
Mark G. Richardson
Keyword(s):  
Portland Cement ◽  
Calcium Sulfate

Hardened portland cement pastes of low porosity

1973 ◽  
Vol 3 (3) ◽  
pp. 279-293 ◽  
Author(s):  
Stephen Brunauer ◽  
Jan Skalny ◽  
Ivan Odler ◽  
Marvin Yudenfreund
Keyword(s):  
Portland Cement ◽  
Cement Pastes ◽  
Low Porosity

Effect of microcrystalline cellulose on geopolymer and Portland cement pastes mechanical performance

2021 ◽  
Vol 288 ◽  
pp. 123053
Author(s):  
Saulo Rocha Ferreira ◽  
Neven Ukrainczyk ◽  
Keoma Defáveri do Carmo e Silva ◽  
Luiz Eduardo Silva ◽  
Eduardo Koenders
Keyword(s):  
Portland Cement ◽  
Microcrystalline Cellulose ◽  
Mechanical Performance ◽  
Cement Pastes

scholarly journals The influence of sulfate availability on rheology of fresh cement paste

2020 ◽  
Vol 30 (1) ◽  
pp. 54-63
Author(s):  
Willy Mbasha ◽  
Rainer Haldenwang ◽  
Irina Masalova
Keyword(s):  
Yield Stress ◽  
Calcium Sulfate ◽  
Chemical Properties ◽  
Plastic Viscosity ◽  
Cement Clinker ◽  
Flow Properties ◽  
Cement Pastes ◽  
Hardened Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractNatural gypsum can degenerate into hemihydrate during cement clinker grinding which changes the physical and chemical properties of cement hydration, affecting therefore the fresh and hardened properties of cement based materials. Cement systems containing a constant total amount of calcium sulfate (4%) with relative proportions of hemihydrate and natural gypsum were considered. Rheological measurements were executed on an Anton Paar MCR51 rheometer to evaluate the flow properties of cement pastes. Results show that, the yield stress and the plastic viscosity of cement pastes were affected when the degeneration of natural gypsum exceeded 50%. Above this concentration, the yield stress remarkably increased and a variation in plastic viscosity of about 50% was observed. Using TG-DSC techniques, it was shown that, the amount of formed ettringite could not explain these rheological changes. However, centrifugational packing and SEM-SE measurements confirmed that, more than the amount of ettringite precipitated, ettringite morphology plays a major role in controlling the yield stress and plastic viscosity of fresh cement pastes.

Electrochemical behavior of Portland cement pastes containing phosphonates

1995 ◽  
Vol 2 (5) ◽  
pp. 182-188 ◽  
Author(s):  
P. Gu ◽  
V.S. Ramachandran ◽  
J.J. Beaudoin ◽  
E. Quinn
Keyword(s):  
Portland Cement ◽  
Electrochemical Behavior ◽  
Cement Pastes

Early carbonation curing effects on the microstructure of high initial strength Portland cement pastes

2019 ◽  
Vol 31 (8) ◽  
pp. 382-388 ◽  
Author(s):  
Alex Neves Junior ◽  
Romildo Dias Toledo Filho ◽  
Jo Dweck ◽  
Frank K. Cartledged ◽  
Eduardo de Moraes Rego Fairbairn
Keyword(s):  
Portland Cement ◽  
Cement Pastes ◽  
Initial Strength ◽  
Carbonation Curing

Portland Cement Pastes with 3-Aminopropyltriethoxysilane Functionalized Nanosilica: Scientific, Hydration and Microstructural Aspects

2021 ◽  
Author(s):  
Julliana Simas Vasconcellos ◽  
Yuri Sotero Bomfim Fraga ◽  
João Henrique da Silva Rêgo ◽  
Patrícia Pommé Confessori Sartoratto ◽  
Moisés Frías Rojas
Keyword(s):  
Portland Cement ◽  
Cement Pastes
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