Durability of mechanically loaded engineered cementitious composites under highly alkaline environments

Şahmaran, Mustafa; Li, Victor C.

doi:10.1016/j.cemconcomp.2007.09.004

Cited by 177 publications

(46 citation statements)

References 12 publications

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“…According to the results of the numerical analyses, the PVA-ECC overlay helps to reduce crack width on a surface of the modelled structural detail so that the rate of penetration of aggressive chemicals in concrete can be reduced, which is in accordance with the experimental investigation reported in [14]. The PVA-ECC provided a relatively strong bond with concrete with occurrence of insignificant delamination.…”

Section: Discussionsupporting

confidence: 74%

“…The results show that the sample destruction starts in concrete part. PVA-ECC layer affects weakly the crack pattern and cracks width in concrete, but it provides thinner cracks on the surface of concrete frame corner, which slows the chemical particles transfer, which is verified by experimental investigation [14]. The PVA-ECC layer is partially delaminated and creates a cohesion zone between the two materials ( Figure 7) because of high ductility and lower strength of bond in tension, so the damaged concrete parts are slightly pulled out of PVA-ECC layer, while the PVA-ECC layer is not broken due its high ductility and strain hardening in tension.…”

Section: Resultsmentioning

confidence: 60%

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Comparison of engineered cementitious composites and concrete for strengthening of concrete structural details using RBSM

Khmurovska

Štemberk

2018

MATEC Web Conf.

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Abstract. This paper presents a numerical simulation and subsequent comparison of strengthening performance of an ordinary concrete overlay and an overlay made of engineered cementitious composite (ECC) with polyvinyl alcohol fibers (PVA). The comparison is performed on an Lshaped joint when the overlay is placed on the outer surface so that the applied bending moment causes tension in the overlay. The nonlinear numerical analysis is based on the three-dimensional rigid-body-spring model (RBSM). The results show the beneficial effect of the PVA fibers within the ECC matrix when the damage is distributed evenly so that only thin microcracks open. The observation is easy to obtain when the RBSM is employed. On the contrary, the overlay made of ordinary concrete fails due to localization of the damage into a single crack. The applicability of the RBSM is discussed.

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Section: Discussionsupporting

confidence: 74%

Section: Resultsmentioning

confidence: 60%

Comparison of engineered cementitious composites and concrete for strengthening of concrete structural details using RBSM

Khmurovska

Štemberk

2018

MATEC Web Conf.

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“…This technique is highly pervasive since it utilizes unhydrated cement and fly ash, which are uniformly dispersed within the cementitious matrix. It has been found that the recovery of transport and mechanical properties can be 100% efficient depending on the preloading levels and exposure conditions (Lepech and Li 2009; Sahmaran and Li 2008;Yamamoto et al 2010;. It has also been shown that this approach can be repeatable.…”

Section: Self-healing Robustness Of Various Approachesmentioning

confidence: 98%

“…Evidence of self-sealing in ECC has been demonstrated by reduced permeability over time ). Evidence of self-healing in the mechanical sense has been demonstrated by recovery of stiffness in pre-damaged specimens (Sahmaran and Li 2008;Yamamoto et al 2010; exposed to various environments.…”

Section: Self-healing Approachesmentioning

confidence: 99%

“…ECC self-healing has been demonstrated under continuous or intermittent water exposures, and at room and elevated temperatures ) and at young and mature ages Yang et al 2011). In addition, ECC has been shown to self-heal under various adverse conditions, such as highly alkaline and chloride environments (Sahmaran and Li 2008;.…”

Section: Self-healing Robustness Of Various Approachesmentioning

confidence: 99%

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Advances in Self-healing Cementitious Materials

2012

ACT

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PrefaceThis special issue is aiming at summarizing recent progress in self-healing cementitious materials and at motivating further development in the relevant research. It took a long time since the efforts to develop self-healing materials working as intelligent materials drew strong attention worldwide in the research communities. Research and development of self-healing performance have been progressing on varieties of materials including metals, non-metals, inorganic and organic materials, and composite materials. Particularly for cement-based materials, based on the background of epoch-making ideas and existing research results, it has become possible to introduce some self-healing functions and their combined mechanisms. These self-healing cementitious materials have potentials to renovate existing structural designs and maintaining schemes and contribute to service life extension and environmental impact reduction. We expect this special issue could support to realize the potential.This special issue was worked out under a strong support of JCI Technical Committee on Self-healing / Repairing Technology in Cement-based Materials (JCI TC-091) chaired by Prof. S. Igarashi, Kanazawa University. This committee's activities included 1) quantitative evaluation of self-healing performance such as water leakage control and loading damage recovery, 2) investigation into self-healing mechanism, and 3) application of non-destructive test to identify self-healing results. Committee members of the TC are listed below.Koichi Maekawa, Editor-in-Chief of ACT TC-091 committee members AbstractReinforced concrete (RC) structures in marine environments are generally affected by harsh marine environmental actions, resulting in early performance degradation mainly due to chloride-induced deterioration. In such conditions, corrosion of rebar progresses rapidly, and also the cross-sectional area of rebar is reduced and consequently structural performance of RC structures will be degraded. In contrast, the surface of concrete structures is often covered with many marine sessile organisms under marine tidal and submerged conditions. These marine sessile organisms have been empirically known to enhance the durability of concrete though the effectiveness is not appropriately evaluated. This paper describes the long-term resistance of concrete with marine sessile organisms to chloride ion penetration in concrete. The effect and its sustainability of marine sessile organisms on chloride ion penetration in concrete were investigated through field exposure tests and laboratory tests. From the test results, the basal membrane, which is a matrix of marine sessile organisms, adheres to concrete strongly on a long-term basis though some gaps between concrete and the basal membrane can be observed. In addition, experimental results and simplified simulation clarified that the attachment of marine sessile organisms can enhance the long-term resistance of concrete to chloride ion penetration.

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Self‐Healing Processes in Concrete

Schlangen

Joseph

2008

Self‐Healing Materials

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Durability of mechanically loaded engineered cementitious composites under highly alkaline environments

Cited by 177 publications

References 12 publications

Comparison of engineered cementitious composites and concrete for strengthening of concrete structural details using RBSM

Comparison of engineered cementitious composites and concrete for strengthening of concrete structural details using RBSM

Advances in Self-healing Cementitious Materials

Self‐Healing Processes in Concrete

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