The Porosity and Pore Structure of Hydrated Cement Pastes as Revealed by Electron Micrsocopy Techniques

1988 ◽  
Vol 137 ◽  
Author(s):  
Ian G. Richardson ◽  
Geoffrey W. Groves ◽  
Sally A. Rodger
Keyword(s):  
Blast Furnace ◽  
Electron Microscope ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Cement Hydration ◽  
Mercury Porosimetry ◽  
Hydrated Cement ◽  
Cement Pastes ◽  
Transmission Electron ◽  
Furnace Slag

AbstractThe application of transmission electron microscope techniques to the study of cement hydration can reveal the nature of the fine pore structure present in dried cement pastes. Studies of OPC cement pastes and OPC/fly ash or blast-furnace slag blends are presented and compared. Preliminary results of a technique which allows effective imaging of the porosity which is important in permeation, and which is involved in mercury porosimetry measurements, are presented.

scholarly journals Relating Rapid Chloride Migration Coefficient of Blast Furnace Slag Concrete to Capillary Pore Structure Parameters

2019 ◽  
Vol 278 ◽  
pp. 01007
Author(s):  
Chao Yang ◽  
Shuguang Wang ◽  
Feng Xu ◽  
Weiwei Li ◽  
Dongsheng Du
Keyword(s):  
Blast Furnace ◽  
Pore Structure ◽  
Blast Furnace Slag ◽  
Pore Radius ◽  
Structure Parameters ◽  
Capillary Porosity ◽  
Chloride Resistance ◽  
Chloride Migration ◽  
Furnace Slag ◽  
Capillary Pore

Blast furnace slag blended concrete is widely used in infrastructure, and its chloride resistance is of great concern. This paper experimentally investigated the capillary pore structure and chloride resistance of blast furnace slag blended concrete. Blast furnace slag was proved to be able to optimize the critical pore radius and decrease the proportion of detrimental capillary pores (with radius between 50 nm and 10,000 nm). Meanwhile, the benefit of BFS in improving the chloride resistance was proved. Finally, regression analysis showed that the rapid migration coefficient is proportional to the critical pore radius and the detrimental capillary pore proportion. Nevertheless, the rapid migration coefficient is not closely related to the capillary porosity.

The Microstructure of ggbfs/OPC Habdened Cement Pastes and Some Effects of Leaching

1989 ◽  
Vol 176 ◽  
Author(s):  
I.G. Richardson ◽  
Sally A. Rodger ◽  
G.W. Groves
Keyword(s):  
Blast Furnace Slag ◽  
Ordinary Portland Cement ◽  
Microstructural Development ◽  
Cement Pastes ◽  
Granulated Blast Furnace Slag ◽  
Transmission Electron ◽  
Radioactive Waste Repositories ◽  
Waste Repositories ◽  
Low Level Radioactive Waste ◽  
Furnace Slag

ABSTRACTGround granulated blast-furnace slag (ggbfs) /Ordinary Portland cement (OPC) blends are possible materials for use in intermediate and low-level radioactive waste repositories. The microstructural development in neat OPC is described. The effect of increasing the loading of ggbfs on the composition and microstructure of the hardened paste has been examined by a number of techniques, including transmission electron microscopy. The implications for performance are discussed. A ggbfs/OPC 9:1 blend which had been exposed, after normal hydration to aqueous leaching was also examined. Marked changes in the microstructure and composition were observed.

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