Hydration mechanism of a cementitious material prepared with Si-Mn slag
Tóm tắt
A cementitious material was prepared by mixing 80wt% Si-Mn slag powder, 10wt% lime, and 10wt% anhydrite. The compressive strength of mortar samples reaches 51.48 MPa after 28 d curing. The analyses of X-ray diffraction (XRD) and scanning electron microscopy (SEM) show that much ettringite is formed in the sample cured for 3 d, and C-S-H gel increases rapidly during subsequent curing. Nuclear magnetic resonance (NMR) analysis of 29Si and 27Al and infrared spectroscopy (IR) analysis show that aluminum decomposition from tetrahedral network of the slag glass and its subsequent migration and re-combination play an important role in the process of hydration and strength development of the samples.
Tài liệu tham khảo
W. Ni, E. Wang, J.P. Li, and H. Sun, Cementing properties of steel slag activated by sodium silicates and sodium hydroxide, J. Univ. Sci. Technol. Beijing, 12(2005), No.12, p.464.
Y.F. Li, Y. Yao, and L. Wang, Recycling of industrial waste and performance of steel slag green concrete, J. Cent. South Univ. Technol., 2009, No.16, p.768.
Q.Y. Chen, D.C. Johnson, L.Y. Zhu, H.Y. Meng, and C.D. Hills, Accelerated carbonation and leaching behavior of the slag from iron and steel making industry, J. Univ. Sci. Technol. Beijing, 14(2007), No.4, p.297.
Q.F. An, P. Chen, and H. Li, Preparation of ecolcement with ferromanganese slag, Guangdong Build. Mater., 2007, No.11, p.120.
Q. F. An, P. Chen, and H. Li, Study on ferromanganese slag applied in ecolcement, Ferro-alloys, 2007, No.6, p.45.
M. Frías and C. Rodríguez, Effect of incorporating ferroalloy industry wastes as complementary cementing materials on the properties of blended cement matrices, Cem. Concr. Compos., 30(2008), No.3, p.212.
M. Frías, M.I. Sánchez de Rojas, C. Rodríguez, The influence of SiMn slag on chemical resistance of blended cement pastes, Constr. Build. Mater., 23(2009), No.3, p.1472.
J. Y. Han, Z. H. Gao, and S.B. Dong, Application of ferromanganese slag feasible mix on cement, Ferro-alloys, 2006, No.4, p.45.
J. Zelic. Properties of concrete pavements prepared with ferrochromium slag as concrete aggregate, Cem. Concr. Res., 35(2005), No.12, p.2340.
J. Y. Han and Z. H. Gao, Study on reactivity of water-quenched slag from Fe-Mn blast furnace, Ferro-alloys, 2003, No.4, p.1.
J.Y. Han and Z. H. Gao, Study on effect of physical activating reactivity for the waste residue from Fe-Mn blast furnace, Ferro-alloys, 2004, No.3, p.13.
C.P. Fan, W. Ni, H.F. Yang, and J.Y. Wu, Preparation of cementitious materials with ferroalloy slag and its microscopic analysis, Bull. Chin. Ceram. Soc., 26(2007), No.3, p.537.
J.Y. Wu, R. S. Zeng, W. Ni, C. P. Fan, X. F. Zhang, and X. G. Yang, Activity of ferroalloy slag and its application to clinker-free cementitious materials preparation, Cement, 2008, No.4, p.2.
J.G.S. van Jaarsveld and J. S. J. van Deventer, The effect of metal contaminants on the formation and properties of waste-based geopolymers, Cem. Concr. Res., 29(1999), No.8, p.1189.
W.K.W. Lee and J. S. J. van Deventer, Structural reorganisation of class F fly ash in alkaline silicate solutions, Colloids Surf. A, 211(2002), No.1, p.49.
P.S. Singh, M. Trigg, I. Burgar, and T. Bastow, Geopolymer formation processes at room temperature studied by 29Si and 27Al MAS-NMR, Mater. Sci. Eng. A, 396(2005), No.1–2, p.392.