Abstract

Engineered cementitious composites (ECCs) are relatively new construction materials characterized by strain-hardening behavior under excessive tensile loading. The intrinsic selfhealing ability of cracks in ECC is an attractive methodology for durability and in some cases for regaining of mechanical properties. In order to achieve the robust self-healing criteria, this dissertation comprises of four main parts. The first part explores the effectiveness of frost action on water movement into micro-cracked ECC. Experimental findings show that until the end of 150 freezing and thawing (F/T) cycles, sorptivity measurements of ECC went down due to self-healing in micro-cracks. However, after 150 F/T cycles, deterioration surpasses the self-healing effect and increased sorptivity. The second part of the research focuses on the effect of self-healing capability on the different transport properties of micro-cracked ECC with several maturity levels and incorporating different mineral admixtures. Experimental results reveal that with the selection of proper mineral admixture, 92% recovery in water sorptivity results is attainable mostly in the first seven days of curing. The third part investigates the effects of progressively increasing sustained loading on self-healing behavior of 180-day-old micro-cracked ECC incorporating different mineral admixtures. Experimental results show that even under progressively increasing sustained mechanical loading, modulus of rupture results greater than the original values could be obtained, depending on the mineral admixture selection. The last part of the dissertation investigates the selfhealing behavior of large scale ECC reinforced beams under load influence. The results show that ECC beams with no regards to their size exhibit strength recovery after 90 days of extended moist curing. As for ductility, ECC beams with lower shear span to depth ratio have more pronounced recovery than the ones with higher ratios.

Highlights

  • The findings demonstrate that the sixty-day period of wet/dry and continuous wet rotation were successful at substantially retaining load bearing powers, stiffness values, and deflection abilities among preconfigured Engineered Cementitious Composites (ECCs)

  • The self-healing capability of ECC was investigated based on structural performance of reinforced ECC beams

  • Lowest flexural deformation capacity was obtained from ECC_S specimens at the end of each age which was related with the improved matrix maturity

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Summary

Introduction

Fresh and hardened air-void parameters of different ECC mixtures are investigated and compared This Chapter focuses on the effects of self-healing on the different transport properties of microcracked Engineered Cementitious Composites (ECCs) with different maturity levels and incorporating three different mineral admixtures (One type of ground granulated blast furnace slag (S) along with two different fly ashes (FA)) with greatly varying chemical compositions. This chapter investigated the effects of progressively increasing sustained loading on self-healing behavior of 180-day-old microcracked Engineered Cementitious Composites (ECC) incorporating different mineral admixtures (MAs). We present the self-healing behavior of large scale ECC reinforced beams under load influence by giving priority to the individual effects of ultra-high ductility with moderate strength of ECC beams. A low ratio of a/d between 1 and 3 was selected to monitor the behavior of test specimens under the influence of shear forces

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