Toughness Properties of Concrete Modified with Water-Borne Polyurethane

Abstract:

A novel kind of block polymer with characteristics of rod-like chain conformations, water-borne polyurethane (PUA), was synthesized by incorporate polyacrylate (PA) into the PU chain to prepare an aqueous polyurethane-polyacrylate (PUA) hybrid emulsion with core-shell structure. The influence of water-borne PUA on workability and mechanical performance of concrete were investigated experimentally. PUA had minimal harmful effect on the compressive strength whereas the flexural strength was increased by 23.2% with dosage of 0.5% and 23.3% with dosage of 1.0%, respectively. The fracture energy ratios of concrete with a dosage of PUA less than 1% are greatly improved more than double with the decreasing of concrete strength less than 10%. The water-borne PUA also enhances the early plastic cracking resistance and the impact resistance of concrete. The impact energy consumption of samples with PUA increase nearly three times more than reference samples, also better than samples with PP fiber. And PUA can refine the crack from 2-4mm to 0.2-0.5mm of the main distribution, decreasing total area of crack greatly.

• Periodical: Applied Mechanics and Materials (Volume 238)
• Pages: 109-117
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.238.109
• Online since: November 2012
• Authors: Bei Ding, Xia Zhang, Dong Ling Zhou, Chan Wen Miao
• Keywords: Concrete Toughness, Early Plastic Cracking Resistance, Fracture Energy, Impact Resistance, Water-Borne Polyurethane

References

[1] Alina Badanoiu, Jonas Holmgren et al, Cementitious composites reinforced with continuous carbon fibers for strengthening of concrete structures, Cement and Concrete Composites, 25 (2003) 387-394.

DOI: 10.1016/s0958-9465(02)00054-9

[2] A. E. Naaman, H. W. Reinhardt, High performance fiber reinforced cement composites HPFRCC-4: International workshop Ann Arbor, Michigan, Cement and Concrete Composites, 6 (2004) 757-759.

DOI: 10.1016/j.cemconcomp.2003.09.001

[3] Andrzej M. Brandt, Fibre reinforced cement-based (FRC) composites after over 40 years of development in building and civil engineering, Composite Structures, 86 (2008) 3-9.

DOI: 10.1016/j.compstruct.2008.03.006

[4] Yoshihiko Ohama, Recent progress in concrete-polymer composites, Advanced Cement Based Materials, 5 (1997) 31-40.

DOI: 10.1016/s1065-7355(96)00005-3

[5] H. Hashimoto, Y. Ohama, Polymer modified mortars, The Journal of the College of Engineering of Nihon University, Series A, 19 (1978) 113-117.

[6] J. M. Gao, C. X. Qian, B. Wang, K. E. Morino, Experimental study on properties of polymer modified cement mortars with silica fume, Cement Concrete Res., 32 (2002) 41-45.

DOI: 10.1016/s0008-8846(01)00626-3

[7] J. G. Wang, S. X. Zhang, et al, Reinforced polymer concrete: Physical properties of the matrix and static/dynamic bond behaviour, Cement Concrete Comp., 27 (2005) 934-944.

DOI: 10.1016/j.cemconcomp.2005.06.004

[8] Y. Ohama, Polymer-based admixtures, Cement Concrete Comp., 20 (1998) 189-212.

DOI: 10.1016/s0958-9465(97)00065-6

[9] S. Pascal, A. Alliche, P. Pilvin, Mechanical behaviour of polymer modified mortars, Mater. Sci. Eng.: A, 380 (2004) 1-2.

DOI: 10.1016/j.msea.2004.03.049

[10] C. T. Sumathy, M. Dharakumar, M. Sarojadevi, S. Saccubai, Modification of cement mortars by polymer latex, J Appl. Polym. Sci., 63 (1997) 1251-1257.

DOI: 10.1002/(sici)1097-4628(19970307)63:10<1251::aid-app2>3.0.co;2-j

[11] L. K. Aggarwal, P. C. Thapliyal, S. R. Karade, Properties of polymer-modified mortars using epoxy and acrylic emulsions, Constr Build Mater., 21 (2007) 379-383.

DOI: 10.1016/j.conbuildmat.2005.08.007

[12] S. Zhong, Z. Chen, Properties of latex blends and its modified cement mortars, Cement Concrete Res., 32 (2002) 1515-1524.

DOI: 10.1016/s0008-8846(02)00813-x

[13] H. Wang, E. H. KO, Y. S., J. K. Jeon, J Ind. Eng. Chem., 26 (2008) 265-271.

[14] T. Sebök, O. Stráněl, Wear resistance of polymer-impregnated mortars and concrete, Cement Concrete Res., 34 (2004) 1853-1858.

DOI: 10.1016/j.cemconres.2004.01.026

[15] J. Y. Do, Y. S. Soh, Performance of polymer-modified self-leveling mortars with high polymer–cement ratio for floor finishing, Cement Concrete Res., 33 (2003) 1497-1505.

DOI: 10.1016/s0008-8846(02)01057-8

[16] Y. Ohama, Recent progress in concrete-polymer composites, Adv. Cement Base Mater., 5 (1997) 31-40.

[17] L. Verdolotti, E. D. Maio, M. Lavorgna, S. Iannace, L. Nicolais, Polyurethane-cement-based foams: Characterization and potential uses, J Appl. Polym. Sci., 107 (2008) 1-8.

DOI: 10.1002/app.24997

[18] J. Nascimento, H. O. Martinelli A.E., D. M. A. Melo, A. C. V. Nóbrega, D. M. H. Martinelli, Pinto E.N.M.G. Polymers, Nanocomposite Systems with Photo-Electro-Ionic Properties and Applications, Mater. Sci. Forum., 591 (2005) 423-429.

DOI: 10.4028/www.scientific.net/msf.591-593.423

[19] O. Lorenz, F. Haulena, O. Klebon, Rubber elastic behavior of polyurethane ionomers, Angew. Makromol Chem., 33 (1973) 159-165.

[20] O. Lorenz, H. Hick, Investigation of the particle surface of anionic polyurethane dispersions with COO‐groups, Angew Makromol Chem., 72 (1978) 115-117.

[21] Z. P. Bazant, M. T. Kazemi, Determination of fracture energy, process zone length and brittleness number from size effect with application to rock and concrete, Int. J Fract., 44 (1990) 111-131.

DOI: 10.1007/bf00047063

[22] S. L. Xu, Y. H. Zhao, et al, The experimental study on the fracture energy of concrete using wedge splitting specimens, J. Hydroelectric Eng., 4 (2003) 15-17 (in Chinese).