Leaching of cement pastes: effect of mineral additions and water-to cement ratio

Title: Leaching of cement pastes: effect of mineral additions and water-to cement ratio
Author(s): M. Moranville
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): K. Kovler, J. Marchand, S. Mindess and J. Weiss
Print-ISBN: 2-912143-46-2
e-ISBN: 2912143586
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 175 - 185
Total Pages: 11
Nb references: 23
Language: English

Abstract: The durability of building materials in their environment has to be considered in the design of new concrete structures requiring a long service life like bridges, tunnels, and radioactive wastes containers. The leaching by water is one of the main parameters of durability. The leaching kinetics strongly depends on material parameters. The effect of mineral additions on Portland cement behavior and the role of cement-to-water ratio were experimentally studied. A total of nine various cement pastes with three cement types (Portland cement, Portland cement with 8% silica fume, and a ternary cement with 57.2% Portland cement, 21.4% slag and 21.4% fly ash) and three water-to-cement ratios (w/c=0.25, 0.4 and 0.5) were leached by pure water during 114 days. Samples were mainly investigated by DTA and SEM. Experimental results clearly show the beneficial effect of mineral additions and low water-to-cement ratio. Finally the effect of the leaching on the elastic modulus was successfully modeled using NIST microstructure models.

Online publication: 2004-02-04
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143586.016