Carbonation of sulphoaluminate cement with layered double hydroxides

Abstract

The increasing importance of the ecologically minded production of building materials makes it necessary to develop reasonable alternatives to the CO₂-intense production of ordinary Portland cement (OPC). The development of new or modified concrete is an important part of existing strategies to improve performance and minimize life-cycle costs. Therefore, we investigated carbonation resistance properties of sulphoaluminate cement (SAC) concrete incorporating layered double hydroxides (LDHs). X-ray diffraction (XRD) and IR-spectroscopy were employed to characterize the component and structural changes of LDHs and cement paste before and after carbonation test. Carbonation resistance of concrete was experimentally evaluated. Finally, carbonation of Portland cement and SAC concrete was compared. The experimental results show that carbonation depth decreases remarkably with the addition of LDHs, especially the calcinated LDHs. Carbonation depth of SAC concrete is smaller than that of PC concrete regardless of curing time.

Keywords

sulphoaluminate cement / carbonation / layered double hydroxides

References

[1] Su M Z, Kurdowski W, Sorrentino F P Development in non-Portland Cements[C]. Proc. 9th Int. Congr. Chem. Cem., New Delhi, 1992

[2] Deng J A, Ge W M, Su M Z, . Sulfoaluminate Cement Series[C]. Proc. 7th Int. Congr. Chem. Cem., Paris, 1980

[3] Wang Y M, Su M Z The Third Series Cement in China[C]. Proceedings of the Third International Symposium on the Cement and Concrete, Shanghai, 1993

[4] Sui T B, Yao Y Recent Progress in Special Cements in China[C]. Proc. 11th Int. Congr. Chem. Cem., Durban, 2003

[5] Newman A C D Chemistry of Clays and Clay Minerals[M], 1987 New York Wiley-Interscience

[6] Cavani C, Vaccari E Trfiro A Hydrotalcite-type Anionic Clays: Preparation, Properties and Applications[J]. Catal. Today, 1991, 11(2): 173-301.

[7] Khan I A, Ohare D Intercalation Chemistry of Layered Double Hydroxides: Recent Developments and Applications[J]. J. Mater. Chem., 2002, 12: 3 191-3 198.

[8] Taylor H F W Cement Chemistry, 2nd ed[M], 1997 London Thomas Telford

[9] Constantino V R L, Pinnavaia T J Basic Properties of Mg_{2+ 1−x} Al³⁺ _x Layered Double Hydroxides Intercalated by Carbonates, Hydroxide, Chloride and Sulfate Anions[J]. Inorg. Chem., 1995, 34: 883-892.

[10] Carlino S The Intercalation of Carboxylic Acids into Layered Double Hydroxides: a Critical Evaluation and Review of the Different Methods[J]. Solid State Ionics, 1997, 98: 73-84.

[11] Gardner E A, Yun S K, Kwon T, . Layered Double Hydroxides Pillared by Macroplyoxometalates[J]. Appl. Clay Sci., 1998, 13: 479-494.

[12] Raki L, Rancourt D G, Detellier C Preparation, Characterization, and Mossbaeur Spectroscopy of Organic Anion Intercalated Pyroaurite-like Layered Double Hydroxides[J]. Chem. Mater., 1995, 7: 221-224.

[13] Allmann R Refinement of the Hybrid Layer Structure Hexahydroxoaluminodicalcium Hemisulfate Trihydrate [Ca₂Al (OH)₆] [1/2SO₄·3H₂O][J]. Neues Jb Mineralog. Monatsh, 1977, 3: 136-144.

[14] Moore A E, Taylor H F W Crystal Structure of Ettringite[J]. Acta Cryst., 1970, 26: 386-393.

[15] Glasser F P, Zhang L Calculation of Chemical Water Demand for Hydration of Calcium Sulfoaluminate Cement[C]. Proceedings of the 4th International Symposium on Cement and Concrete, Shanghai, 1998

[16] Chrysochoou M, Dermatas D Evaluation of Ettringite and Hydrocalumite Formation for Heavy Metal Immobilization: Literature Review and Experimental Study[J]. J. Hazard. Mater., 2006, 136: 20-33.

[17] Glasser F P, Kindness A, Stronach S A Stability and Solubility Relationships in AFm Phases: Part I. Chloride, Sulfate and Hydroxide[J]. Cem. Concr. Res., 1999, 29: 861-866.

[18] Gougar M L D, Scheetz B E, Roy D M Ettringite and C-S-H Portland Cement Phases for Waste Ion Immobilization: a Review[J]. Waste Manage, 1996, 16: 295-303.