Effect of polymer-based grinding aid on sulfate attacking resistance of concrete

Abstract

Influences of polymer-based grinding aid (PGA) on the damage process of concrete exposed to sulfate attack under dry-wet cycles were investigated. The mass loss, dynamic modulus of elasticity (E _rd), and S and Ca element contents of concrete specimens were measured. Scanning electron microscopy (SEM), mercury intrusion porosimetry(MIP), and X-ray diffractometry(XRD) were used to investigate the changing of microstructure of interior concrete. The results indicated that PGA was capable of reducing the mass loss and improving the sulfate attack resistance of concrete. X-ray fluorescence (XRF) analysis revealed that PGA delayed the transport process of sulfate ions and Ca ions. In addition, MIP analysis disclosed that the micropores of concrete with PGA increased in the fraction of 20–100 nm and decreased in the residues of 200 nm. Compared with the blank sample, concrete with PGA had more slender and well-organized hydration products, and no changes in hydration products ratio or type were observed.

Keywords

polymer-based grinding aid / concrete / sulfate attack / microstructure

References

[1] Benzer H, Ergün L, Öner M, et al. Simulation of Open Circuit Clinker Grinding [J]. Miner. Eng., 2001, 14(7): 701-710.

[2] Jankovic A, Valery W, Davis E. Cement Grinding Optimisation[J]. Miner. Eng., 2004, 17(11): 1075-1081.

[3] Dundar H, Benzer H, Aydogan N. Simulation Assisted Capacity Improvement of Cement Grinding Circuit: Case Study Cement Plant[J]. Miner. Eng., 2011, 24(3): 205-210.

[4] Jeknavorian A, Barry E, Serafin F. Determination of Grinding Aids in Portland Cement by Pyrolysis Gas Chromatography-mass Spectrometry[J]. Cem. Concr. Res., 1998, 28(9): 1335-1345.

[5] Quy N N, Lam N T. The Effect of Triethanolamine and Limestone Powder on Strength Development and Formation of Hardened Portland Cement Structure[C]. JSCE-VIFCE Joint Seminar on Concrete Engineering, 2005

[6] Magistri M, Presti A L. Influence of Grinding Aids[J]. World Cement, 2007, 6: 39-41.

[7] Gao X, Yang Y, Deng H. Utilization of Beet Molasses as a Grinding Aid in Blended Cements[J]. Constr. Build. Mater., 2011, 25(9): 3782-3789.

[8] Zhang T, Gao J, Hu J. Preparation of Polymer-based Cement Grinding Aid and Their Performance on Grindability[J]. Constr. Build. Mater., 2015, 75: 163-168.

[9] Costa A, Appleton J. Case Studies of Concrete Deterioration in a Marine Environment in Portugal[J]. Cem. Concr. Comp., 2002, 24(1): 169-179.

[10] Neville A. The Confused World of Sulfate Attack on Concrete[J]. Cem. Concr. Res., 2004, 34(8): 1275-1296.

[11] Al-Akhras N M. Durability of Metakaolin Concrete to Sulfate Attack [J]. Cem. Concr. Res., 2006, 36(9): 1727-1734.

[12] Rozière E, Loukili A, El Hachem R, et al. Durability of Concrete Exposed to Leaching and External Sulphate Attacks[J]. Cem. Concr. Res., 2009, 39(12): 1188-1198.

[13] Bassuoni M, Nehdi M. Durability of Self-consolidating Concrete to Sulfate Attack under Combined Cyclic Environments and Flexural Loading[J]. Cem. Concr. Res., 2009, 39(3): 206-226.

[14] Bassuoni M, Nehdi M. Durability of Self-consolidating Concrete to Different Exposure Regimes of Sodium Sulfate Attack[J]. Mater. Struct., 2009, 42(8): 1039-1057.

[15] Zuquan J, Wei S, Yunsheng Z, et al. Interaction Between Sulfate and Chloride Solution Attack of Concretes with and without Fly Ash[J]. Cem. Concr. Res., 2007, 37(8): 1223-1232.

[16] Aye T, Oguchi C T. Resistance of Plain and Blended Cement Mortars Exposed to Severe Sulfate Attacks[J]. Constr. Build. Mater., 2011, 25(6): 2988-2996.

[17] Hartell J A, Boyd A J, Ferraro C C. Sulfate Attack on Concrete: Effect of Partial Immersion[J]. J. Mater. Civil Eng., 2010, 23(5): 572-579.

[18] Brown P W, Doerr A. Chemical Changes in Concrete Due to Ingress of Aggressive Species[J]. Cem. Concr.Res., 2000, 30(3): 411-418.

[19] Maltals Y, Samson E, Marchand J. Predicting the Durability of Portland Cement Systems in Aggressive Environments-laboratory Validation[J]. Cem. Concr. Res., 2004, 34: 1579-1589.