Characteristics and durability test of magnesium phosphate cement-based material for rapid repair of concrete
Tóm tắt
This paper presents some research results on characteristics and durability of magnesium phosphate cement-based material, such as strength, coefficient of thermal expansion, drying shrinkage, corrosion protection, deicer-frost resistance, abrasive resistance and strength loss while soaking in water or 3% NaCl solution. Experimental results indicate that MPB materials posses high deicer-frost resistance, high abrasion resistance and high corrosion protection for reinforcing steel. In addition, the MPB materials have good compatibility and bond with old concrete, and very low drying shrinkage. However, for the MPB materials soaked in water or 3% NaCl solution for a long time, the strengh loss occurs. Laboratory and field studies show that the MPB materials are suitable for rapid repair of concrete structures. especially pavements aiport runways, bridge decks and key municipal roads, etc.
Tài liệu tham khảo
Emmons, P. H., Vaysburd, A. M. and McDonald, J. E., ‘A rational approach to durable concrete repair’,Concrete International: Design & Construction 15 (9) (1993) 40–45.
Emmons, P. H., ‘Selecting concrete repair materials for long-term durability based on available test data’, Proceedings of the Second National Concrete Engineering Conference, Chicago, 1992.
Popovics, S., Rajendran, N. and Penko, M., ‘Rapid hardening cements for repair of concrete’,ACI Materials Journal 8 (1) (1987) 64–73.
Abdeirazig, B. E. I., Sharp, J. H. and Ei-Jazairi, B., ‘The chemical composition of mortars made from magnesia-phosphate cement’,Cement and Concrete Research 18(3) (1988) 415–425.
Sarkar, A. K. ‘Phosphate cement-based fast-setting binders’,Ceramic Bulletin 69 (2) (1990) 234–238.
Yang, Q. and Wu, X., ‘Study of rapid setting phosphate-based repair material’,China Cement and Concrete Products 86 (6) (1995) 29–36 (in Chinese).
Yoshizaki, Y., Ikeda, K., Yoshida, S. and Yoshizumi A., ‘Physicochemical study of magnesium-phosphate cement’, Proceedings of the MRS International Meeting on Advanced Materials, Vol. 13, Tokyo, May 31-June 1, 1988 (Materials Research Society, Pittsburgh, Pennsylvania, 1989) 27–37.
Seehra, S. S., Gupta, S. and Kumar, S., ‘Rapid setting magnesium phosphate cement for quick repair of concrete pavements’,Cement and Concrete Research 23 (2) (1993) 254–266.
Huang, Y., ‘Theories on Metal Corrosion and Its Protection’, (Shanghai Jiaotong University, 1989) 138–176 (in Chinese).