The Interfacial Transition Zone (ITZ) Between Cement Paste and Aggregate in Concrete
Tóm tắt
This paper describes the so called interfacial transition zone—ITZ—in concrete. This is the region of the cement paste around the aggregate particles, which is perturbed by the presence of the aggregate. Its origin lies in the packing of the cement grains against the much larger aggregate, which leads to a local increase in porosity and predominance of smaller cement particles in this region. The ITZ is region of gradual transition and is highly heterogeneous, nevertheless the average microstructural features may be measured by analysis of a large numbers of backscattered electron images of polished concrete samples. Such measurements show that the higher porosity present initially is significantly diminished by the migration of ions during hydration.
Tài liệu tham khảo
J.C. Maso (ed.), “Interfacial Transition zone in Concrete,” RILEM report 11 (E&FN Spon, London, 1996).
M.G. Alexander, G. Arliguie, G. Ballivy, A. Bentur, and J. Marchand, “Engineering and Transport Properties of the Interfacial Transition Zone in Cementitious Composities,” Report 20 (RILEM Publications S.A.R.L., 1999).
K.L. Scrivener and E.M. Gartner, in Bonding in Cementitious Composites (Proc. Mat. Res. Soc. Symp., 114, 1988), p. 77.
K.L. Scrivener, A. Bentur, and P.L. Pratt, Adv. Cem. Res. 1, 230 (1988).
K.L. Scrivener, A.K. Crumbie, and P.L. Pratt, in Bonding in Cementitious Composites (Proc. Mat. Res. Soc. Symp., 114, 1988), p. 87.
A.K. Crumbie, PhD Thesis, University of London, 1994.
P. Laugesen, presentation 4th Euroseminar on Microscopy Applied to Building Materials, June 1993.
J. Grandet and J-P. Ollivier, in Proceeding of 7th International Congress of the Chemistry of Cement (Editions Septima, Paris, 1980), vol. III, pp. VII 63–68 and 85–89.
P.J.M. Monteiro and P.K. Mehta, Cement and Concrete Research 15, 378 (1985).
K.L. Scrivener and K.M. Nemati, Cement and Concrete Research 26, 35(1996).
B.D. Barnes, S. Diamond, and W.L. Dolch, Cement and Concrete Research 8, 233 (1978).
K.L Scrivener and P.L. Pratt, in Proc. 8th Int. Cong. on the Chemistry of Cements, Rio de Janeiro (1986), vol. III, p. 466.
P.J.M. Montiero, in ref. 1, p. 64.
Z. Hashin and P.J.M. Montiero, Cement and Concrete Research 32, 1291 (2002).
J. Marchand and A. Delagrave, in ref. 2, p. 157.
A. Delagrave, J. Marchand, and M. Pigeon, Advanced Cement Based Materials 7, 60 (1998).
N.R. Buenfeld and E. Okundi, Magazine of Concrete Research 50, 339 (1998).