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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2018, Vol. 12 Issue (3) : 261-269
Effect of natural pozzolan content on the properties of engineered cementitious composites as repair material
Said CHOUCHA, Amar BENYAHIA, Mohamed GHRICI(), Mohamed Said MANSOUR
Geomaterials Laboratory, Civil Engineering Department, University Hassiba Benbouali of Chlef, BP 151, Chlef 02000, Algeria
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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     
Corresponding Authors: Mohamed GHRICI   
Online First Date: 26 May 2017    Issue Date: 22 May 2018
 Cite this article:   
Said CHOUCHA,Amar BENYAHIA,Mohamed GHRICI, et al. Effect of natural pozzolan content on the properties of engineered cementitious composites as repair material[J]. Front. Struct. Civ. Eng., 2018, 12(3): 261-269.
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Mohamed GHRICI
Mohamed Said MANSOUR
Chemical composition/% Portland Cement Natural Pozzolan
CaO 64.0 10.5
SiO2 19.9 46.4
Al2O3 5.6 17.5
Fe2O3 2.5 10.5
MgO 1.8 3.8
SO3 3.1 0.4
K2O 0.7 1.5
Na2O 0.1 3.4
Physical properties
SSB (cm2/g) 3100 4100
Glass content / >15%
Tab.1  Chemical and physical properties of Portland Cements and Natural Pozzolan
Elastic Modulus
Elongation (%) Tensile strength (GPa) Density(g/cm3)
8 40 41 6.5 1.6 1.3
Tab.2  Properties of the PVA fibers
Mixture ID PC NP Sand w/cm NP/C HRWRA Fiber (%)
ECC_1.2 568 682 450 0.29 1.2 12 2
ECC_1.7 463 787 450 0.29 1.7 13 2
ECC_2.2 391 859 450 0.29 2.2 14.5 2
ECC_2.7 338 912 450 0.29 2.7 14.5 2
ECC_3.2 298 952 450 0.29 3.2 15 2
Tab.3  Mix proportion of ECCs with different replacement level (kg/m3)
Fig.1  Measurement of ultrasonic wave propagation velocity through the specimen
Fig.2  Schematic diagram of water absorption test
Fig.3  Frame to measure shrinkage deformation
Fig.4  Photo for slump flow diameter measured for ECC-2.7
Fig.5  Effect of natural pozzolan content on the compressive strength and flexural strength of ECCs
Fig.6  Effect of NP/PC ratio on the Elastic modulus of ECCs
Fig.7  Capillary absorption coefficient of different ECCs mixtures
Fig.8  Autogenous shrinkage development of ECC mixtures with various natural pozzolan contents
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