Effect of natural pozzolan content on the properties of engineered cementitious composites as repair material

Abstract

In order to determine the effect of Natural Pozzolan (NP) content on the mechanical properties and durability characteristics on Engineered Cementitious Composites (ECC) as repair material. This study focused on the evaluation of the most factors influencing compatibility between the repair material and the base concrete including mechanicals properties such as, compressive and flexural strengths, elastic modulus, capillary absorption and drying shrinkage. The experimental results showed that natural pozzolan reduces the compressive strength and the flexural strength of ECC at all ages. The elastic modulus of ECC was remarkably lower than that of normal-strength concrete. This lower Young’s modulus is desirable for repair concrete, because it prevents the stresses induced by restrained shrinkage. In addition, the incorporation of high-volume natural pozzolan decreases significantly the coefficient of capillary absorption at long term and increases the drying shrinkage. Generally, based on the results obtained in the present experimental investigation, ECC can be used effectively as an overlay material over existing parent concrete.

Keywords

natural pozzolan / engineered cementitious composites / mechanical strengths / elastic modulus / capillary absorption / drying shrinkage

References

[1] Matthews S. CONREPNET: Performance-based approach to the remediation of reinforced concrete structures: Achieving durable repaired concrete structures. Journal of Building Appraisal, 2007, 3(1): 6–20

[2] Zhou J. Performance of engineered cementitious composites for concrete repairs. PhD Thesis, Delft University of Technology, Netherlands, 2011

[3] Mallat A, Alliche A. Mechanical investigation of two fiber-reinforced repair mortars and the repaired system. Construction & Building Materials, 2011, 25(4): 1587–1595

[4] Al-Zahrani M, Maslehuddin M, Al-Dulaijan S, Ibrahim M. Mechanical properties and durability characteristics of polymer-and cement-based repair materials. Cement and Concrete Composites, 2003, 25(4): 525–537

[5] Emberson N K, Mays G C, Mays G C. Significance of property mismatch in the patch repair of structural concrete. Part 3: Reinforced concrete members in flexure. Magazine of Concrete Research, 1996, 48(174): 45–57

[6] Li M. Multi-scale design for durable repair of concrete structures. PhD Thesis, University of Michigan, USA, 2009

[7] Li V C, Horii H, Kabele P, Kanda T, Lim Y. Repair and retrofit with engineered cementitious composites. Engineering Fracture Mechanics, 2000, 65(2): 317–334

[8] Pattnaik R. Investigation into compatibility between repair material and substrate concrete using experimental and finite element method. PhD Thesis, Clemson University, USA, 2006

[9] Hassan K, Brooks J, Al-Alawi L. Compatibility of repair mortars with concrete in a hot-dry environment. Cement and Concrete Composites, 2001, 23(1): 93–101

[10] Li V C. On engineered cementitious composites (ECC): a review of the material and its applications. Journal of Advanced Concrete Technology, 2003, 1(3): 215–230

[11] Zhu Y, Yang Y, Dang H, Yao Y. Mechanical properties of engineered cementitious composites with high volume fly ash. Journal of Wuhan University of Technology-Materials Science Edition, 2009, S1: 166–170

[12] Yang E H, Yang Y, Li V C. Use of high volumes of fly ash to improve ECC mechanical properties and material greenness. ACI. Journal of Materials, 2007, 104(6): 620–628

[13] Özbay E, Karahan O, Lachemi M, Hossain K, Duran Atiş C. Investigation of Properties of Engineered Cementitious Composites Incorporating High Volumes of Fly Ash and Metakaolin. ACI Materials Journal, 2012, 109(5): 565–571

[14] Zhu Y, Yang Y, Yao Y. Use of slag to improve mechanical properties of engineered cementitious composites (ECCs) with high volumes of fly ash. Construction & Building Materials, 2012, 36: 1076–1081

[15] Lim Y M, Li V C. Durable repair of aged infrastructures using trapping mechanism of engineered cementitious composites. Cement and Concrete Composites, 1997, 19(4): 373–385

[16] Wang S, Li V C. High-early-strength engineered cementitious composites. ACI Materials Journal, 2006, 103(4): 97–105

[17] Li V C. High performance fiber reinforced cementitious composites as durable material for concrete structure repair. International Journal for Restoration, 2004, 10(2): 163–180

[18] Yıldırım G, Sahmaran M, Al-Emam M, Hameed R, Al-Najjar Y, Lachemi M. Effects of Compressive Strength, Autogenous Shrinkage, and Testing Methods on Bond Behavior of High-Early-Strength Engineered Cementitious Composites. ACI Materials Journal, 2015, 112(4): 409–418

[19] Sahmaran M, Yucel H E, Al-Emam M, Yaman I O, Guler M. Bond Characteristics of Engineered Cementitious Composite Overlays. In: Transportation Research Board 92nd Annual Meeting, 2013, 13–1578

[20] Ghrici M, Kenai S, Said-Mansour M. Mechanical properties and durability of mortar and concrete containing natural pozzolana and limestone blended cements. Cement and Concrete Composites, 2007, 29(7): 542–549

[21] EN 12190-6. Products and systems for the protection and repair of concrete structures-Test methods- Determination of compressive strength of repair mortar, 1999

[22] EN 1015-18. Methods of test for mortar for masonry, Part 18: Determination of water absorption coefficient due to capillary action of hardened mortar, 2003

[23] Lepech M D, Li V C, Robertson R E, Keoleian G A. Design of green engineered cementitious composites for improved sustainability. ACI Materials Journal, 2008, 105(6): 567–575

[24] Yang Y, Yao Y, Gao X, Deng H, Yu P, GAO X, Deng H, Yu P. Shrinkage reducing measures for engineering cementitious composites. Wuhan University Of Technology-Materials Science Edition, 2008, 23(6): 907–911

[25] Decter M. Durable concrete repair—Importance of compatibility and low shrinkage. Construction & Building Materials, 1997, 11(5): 267–273

[26] Li M, Li V C. High-Early-Strength Engineered Cementitious Composites for Fast, Durable Concrete Repair-Material Properties. ACI Materials Journal, 2011, 108(1): 3–12

[27] EN 1504-3. Products and systems for the protection and repair of concrete structures- Definitions, requirements, quality control and evaluation of conformity-Part 3: Structural and non-structural repair; 2006

[28] Xinqi M, Zhao T, Zhang P. Optimization of shrinkage and crack resistance performance of Engineered Cementitious Composites (ECC). Electric Technology and Civil Engineering (ICETCE), International Conference on, IEEE, 2011, 6: 534–538

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg