Characteristics and mechanism of modified triethanolamine as cement grinding aids

Abstract

Effects of modified triethanolamine as cement grinding aids on particles characteristics and mechanical property of cement were studied, and its reaction mechanism was analyzed by IR, Zeta potential, SEM, XRD and TG-DTA. The results show that the content of 3–32 μm particles for cement with 0.015% modified triethanolamine(M-TEA) is increased by 12.4%, and the compressive strengths of cement with 0.03% M-TEA are increased by 5.5 and 8.2 MPa at 3 and 28 days, respectively. And both the grinding and enhancement effects of M-TEA on cement are better than triethanolamine. The mechanism analysis shows that M-TEA not only has the amino and hydroxyl groups of TEA, but also has the ester, carbonyl, carboxyl groups which easily combine with metal ions of cement minerals, resulting in that M-TEA can promote surface adsorption and shield the unsaturated charges in the surface and crack section of particles, thus particles reunion is prevented and grinding efficiency is improved. Enhancement of M-TEA on cement mainly lies in that it can promote or induce hydration reaction of cement mineral with gypsum and water, which accelerates formation of hydration products, and then improves the structure and morphology of cement hydration products, thus the uniformity and compactness of product structure is increased.

Keywords

modified triethanolamine / grinding aids / cement / particles characteristics / mechanical property / mechanism / cement hydration

References

[1] Katsioti M, Tsakiridis P E, Giannatos P, . Characterization of Various Cement Grinding Aids and Their Impact on Grindability and Cement Performance[J]. Constr. Build. Mater., 2009, 23(5): 1 954-1 959.

[2] Albayrak A T, Yassar M, Gurkaynak M A, . Investigation of the Effects of Fatty Acids on the Compressive Strength of the Concrete and the Grindability of the Cement[J]. Cem. Concr. Res., 2005, 35(2): 400-404.

[3] Garcia F, Bolay N L, Trompette J L, . On Fragmentation and Agglomeration Phenomena in an Ultrafine Wet Grinding Process: the Role of Polyelectrolyte Additives[J]. Int. J. Miner. Process., 2004, 74(Suppl.): S43-S54.

[4] Zhu X, Hou H, Huang X Q, . Enhance Hydration Properties of Steel Slag Using Grinding Aids by Mechanochemical Effect[J]. Constr. Build. Maters, 2012, 29(4): 476-481.

[5] Gao X J, Yang Y G, Deng H W Utilization of Beet Molasses as a Grinding Aid in Blended Cements[J]. Constr. Build. Mater., 2011, 25(9): 3 782-3 789.

[6] Teoreanu I, Guslicov G Mechanisms and Effects of Additives from the Dihydroxy-compound Class on Portland Cement Grinding[J]. Cem. Concr. Res., 1999, 29(1): 9-15.

[7] Schneider M, Romer M, Tschudin M, . Sustainable Cement Production-present and Future[J]. Cem. Concr. Res., 2011, 41(7): 642-650.

[8] Hill J, Sharp J H The Mineralogy and Microstructure of Three Composite Cements with High Replacement Levels[J]. Cem. Concr. Compos., 2002, 24(2): 191-199.

[9] Poon C S, Lam L, Wong Y L A Study on High Strength Concrete Prepared with Large Volume of Low Calcium Fly Ash[J]. Cem. Concr. Res., 2000, 30(3): 447-55.

[10] Jiang C H, Cai A L, Yan S, . Study on High Performance Grinding Aids of Cement[J]. J. Chin. Ceram. Soc., 2001, 29(6): 508-511.

[11] Ding X Q, Zhao S, Ling J, . A Survey on Study and Application of Cement Grinding Aids[J]. Mater. Rev., 2004, 18(6): 61-63.

[12] Kong X M, Lu Z B, Zhang Y R, . Effect of Organic Grinding Aids on Cement Properties and the Analysis via Organic Cement Chemistry[J]. J. Chin. Ceram. Soc., 2012, 40(1): 49-55.

[13] Ma B G, Xu Y H, Dong R Z Influence of Triethanolamine on the Initial Structure Formation and Mechanical Properties of Cement[J]. J. Build. Mater., 2006, 9(1): 6-9.

[14] Ramachandran V S Hydration of Cement-role of Triethanolamine[J]. Cem. Concr. Res., 1976, 6(5): 623-631.

[15] Heren Z, hlmez H The Influence of Ethanolamines on the Hydration and Mechanical Properties of Portland Cement[J]. Cem. Concr. Res., 1996, 26(5): 701-705.

[16] Li X J Effect of Grinding Aids on Adsorption Quantity of Superplasticizer on the Surface of Cement Particles[J]. Concr., 2010 71-73.

[17] Celik I B The Effects of Particle Size Distribution and Surface Area upon Cement Strength Development[J]. Powder Technol., 2008, 188(3): 272-276.

[18] Powder Technol., 1995, 83(3245-252

[19] Wang Y, Xu L L Research Progress of the Influence of Particle Size Distribution on the Properties of Cement[J]. Mater. Rev., 2010, 24(12): 68-71.

[20] Sajedi F, Razak H A Effect of Curing Regimes and Cement Fineness on the Compressive Strength of Ordinary Portland Cement Mortars[J]. Constr. Build. Mater., 2011, 25(4): 2 036-2 045.

[21] Wang Y, Wang Y J, Zhang Z Y, . Effect of Different Organic Group on Cement Grinding Process[J]. Bull. Chin. Ceram. Soc., 2009, 28(3): 575-579.

[22] Wang B, Zheng Q, Wang S P, . Synthesis of Several Modified Triethanolamine Compounds and their Effects on Portland Cement Grinding[J]. Bull. Chin. Ceram. Soc., 2009, 28(6): 1 235-1 240.

[23] Paramasivam R, Vedaraman R Effect of Fatty Acid Additives on the Material Flow Properties of Dry Grinding[J]. Powder Technol., 1993, 77(1): 69-78.

[24] Wang D M, Cheng P F, Xiong W F, . Influences of Soluble Salts on Adsorption Properties of Polycarboxylate Superplasticizers[J]. J. Wuhan University of Technology-Mater. Sci. Ed., 2012, 27(4): 684-688.