Microstructure characteristics in the cement paste containing micronized sand as filler

Title: Microstructure characteristics in the cement paste containing micronized sand as filler
Author(s): Y. Wang, G. Ye, Z. Guo, K. van Breugel, T.Q. Phung
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 87 - 96
Total Pages: 10
Nb references: 10
Language: English

Abstract: In recent decades, the cement industry became aware, more and more, of the economic and environmental problems of concrete associated with the use of ordinary Portland cement (OPC). Attempts have been made to partially replace the cement by active or inert components, such as limestone filler, fly ash and finer sands. Whether the blend material is feasible and guarantees the long term properties in comparison with OPC is still an open research area. In this study, cement pastes with and without micronized sand have been investigated by means of mercury intrusion porosimetry (MIP) and electronic scanning electron microscope (ESEM). The proportion of replacement was 20% by weight. From the results, paste with micronized sand (CM6) can increase the rate of hydration compared with OPC paste when the water to binder ratio is kept constant (w/b=0.4). When the water to cement ratio is kept constant (w/c=0.4), paste with micronized sand has lower porosity and finer pore structure compared with OPC paste. Seen from the interfacial transition area, big pores are mainly located around sand particles. Sand particles can give some contribution to compensate the increasing of porosity in CM6.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00