Self-healing of self-compacting concretes made with blast furnace slag cements activated by crystalline admixture

Takagi, Emilio Minoru; Lima, Maryangela Geimba de; Helène, Paulo; Medeiros, Ronaldo A.

doi:10.1504/ijmpt.2018.089116

Cited by 24 publications

(7 citation statements)

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“…A recent study showed that the autogenous healing could be enhanced using GGBFS and crystalline admixture rather than using fly ash [28]. The results of this work confirmed that concretes incorporating supplementary cementitious materials like GGBFS can develop superior self-healing properties owing to the significant amount of unhydrated particles present in its microstructures as well as improved mechanical and permeation properties when stressed by mechanical loads [29]. On the other hand, another study investigated the proper distribution of cement particle sizes providing a suitable amount of Ca(OH) 2 and unhydrated cement to improve the self-healing ability of concrete [30].…”

Section: Introductionsupporting

confidence: 74%

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

et al. 2020

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Crack healing has been studied extensively to protect reinforced concrete structures from the ingress of harmful ions. Research examining the regain in the mechanical properties of self-healing composites has focused mostly on the computation of the healing ratio based on the measurement of the tensile and compressive strengths but with poor regard for the flexural performance. However, the regain in the flexural performance should also be investigated for design purposes. The present study performs flexural testing on reinforced concrete members using crushed clinker binder and aggregates as well as crystalline admixtures as healing agents. Healing ratios of 100% for crack widths smaller than 200 μm and 85% to 90% for crack widths of 250 μm were observed according to the admixing of clinker binder and aggregates. Water flow test showed that the members replacing binder by 100% of clinker achieved the best crack healing performance. The crack healing property of concrete improved to some extent the rebar yield load, the members’ ultimate load and energy absorption capacity and ductility index. The crack distribution density from the observed crack patterns confirmed the crack healing effect provided by clinker powder. The fine grain size of clinker made it possible to replace fine aggregates and longer healing time increased the crack healing effect.

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Section: Introductionsupporting

confidence: 74%

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

et al. 2020

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“…It is a well-known phenomenon that originates from natural processes in cementitious material, such as the hydration of clinker minerals or the carbonation of calcium hydroxide, and it is considered to be the most popular approach for practical applications. A recent study showed that autogenous healing could be enhanced using mineral admixtures such as ground-granulated blast-furnace slag (GGBFS) and crystalline admixtures [21,22]. Another study investigated the proper distribution of cement particle sizes that could provide a suitable amount of Ca(OH) 2 and unhydrated cement and thereby improve the selfhealing ability of concrete [23].…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Performance Evaluation of Concrete Incorporating Inorganic Materials Based on a Water Permeability Test

et al. 2021

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Research activities that have focused on the development and understanding of self-healing concrete have proposed various technologies intended to enhance self-healing capacity. The self-healing performance cannot be identified sufficiently with either a single test or a specific parameter because there are a number of factors that influence the performance of self-healing. Thus, it has become necessary to provide standardized test methods that make it possible to verify and compare the performance of self-healing materials. In this paper, self-healing mortars based on inorganic admixtures, which are developed for sealing 0.3 mm cracks with a healing index of 90%, are produced and used to validate the water permeability test and to propose protocols for the evaluation of self-healing performance. The healing performances of three self-healing mortars and a plain mortar as a reference are evaluated with a comparative study. The equivalent crack width, which can be estimated from the water flow rate, is suggested as a rational evaluation index. Finally, a self-healing performance chart is proposed to comprehensively show the healing performance of cement-based materials.

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“…Their results showed that re-curing (healing) in water is more efficient as compared to only air curing to heal cracks so that damaged SCC specimens recovered compressive strength by 58% (Ramadan and Haddad 2017). Takagi et al (2015) (Takagi et al 2015) reported that the mechanical strength recovery is higher in SCC mixtures containing blast furnace slag cement (up to 55%) as compared to other Brazilian types of cement. They also recommended that the wet-dry cycle is more efficient than only wet conditions for the self-healing method in SCC.…”

Section: Introductionmentioning

confidence: 99%

Application of Superabsorbent Polymer as Self-Healing Agent in Self-Consolidating Concrete for Mitigating Precracking Phenomenon at the Rebar–Concrete Interface

Mousavi

Guizani

Bhojaraju³

et al. 2021

J. Mater. Civ. Eng.

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Improved autogenous healing capacity of concrete is used in the present study, using superabsorbent polymers (SAP), to present an efficient approach for mitigating damages between steel rebar and self-consolidating concrete (SCC). Additionally, a comparison study is conducted between the results for normal concrete (NC) and those for SCC mixtures. Two SAPs with different particle sizes and chemical compositions are considered in the experimental program.Results show that despite the higher reduction effect of SAP with smaller particle size on compressive strength, SCC containing this type of SAP has the highest bond strength in uncracked specimens, as compared to SAP with larger particle size, for both SAP-modified NC and SCC mixtures. Moreover, regarding the healed specimens, results show that SCC and NC containing SAP considerably have higher healing improvement factors for large crack widths (𝑤𝑤 ≥ 0.30 mm) as compared to mixtures without polymers so that almost 46%, 30%, and 24% healing

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Self-healing of self-compacting concretes made with blast furnace slag cements activated by crystalline admixture

Cited by 24 publications

References 0 publications

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

Effect of Clinker Binder and Aggregates on Autogenous Healing in Post-Crack Flexural Behavior of Concrete Members

Self-Healing Performance Evaluation of Concrete Incorporating Inorganic Materials Based on a Water Permeability Test

Application of Superabsorbent Polymer as Self-Healing Agent in Self-Consolidating Concrete for Mitigating Precracking Phenomenon at the Rebar–Concrete Interface

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