A “fracture testing” based approach to assess crack healing of concrete with and without crystalline admixtures

Ferrara, Liberato; Krelani, Visar; Carsana, Maddalena

doi:10.1016/j.conbuildmat.2014.07.008

Cited by 233 publications

(172 citation statements)

References 24 publications

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“…Out of the four exposure conditions, self-healing in WI and WD conditions are efficient. Similarly, response from early researchers [20][21][22][23] has showed the importance of water in the development of healing materials regardless of the minerals used for samples. For each test series under water curing condition, one representative crack location was chosen and the change in surface crack width was represented in Figure 6.…”

Section: Recovery Of Compressive Strengthmentioning

confidence: 99%

“…In most of the cases, healing effects of autogenous healing are unreliable. Hence, engineered healing concepts are focussed in the recent years by incorporating self-healing agents, such as microencapsulated healing agents [15][16][17], bacterial concrete [18][19] and CAs [20][21][22][23]. The main objective of this project is to determine the self-healing ability of high-strength concrete (M70) with fly ash and CA in different exposure conditions.…”

Section: Introductionmentioning

confidence: 99%

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Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Reddy

Theja²,

Sashidhar

2018

CivileJournal

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The aim of this study is to analyse the self-healing capability of high-strength fibre-reinforced concrete (M70) with fly ash and crystalline admixture (CA) in four types of environmental exposures i.e. Water Immersion (WI), Wet-Dry Cycles (WD), Water contact (WC) and Air Exposure (AE). Specimens for four mixes are cast, one mix containing 1.1% of CA and three mixes with 10%, 20% and 30% partial replacement of cement with fly ash and additions of 1.1% CA. The specimens were pre-cracked at 28 days, in the range of 0.10-0.40 mm and the time set for healing was 42 days. The result shows that all the mixes have considerable amount of closing ability and strength-regaining capability for all exposure conditions. The concrete with 20% fly ash and 1.1% CA has complete crack closing ability and 100% strength-regaining capability for WI and WD cycle conditions. From SEM analysis, it is confirmed that self-healing products are CaCO3 and C-S-H gel.

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Section: Recovery Of Compressive Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Reddy

Theja²,

Sashidhar

2018

CivileJournal

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“…In a companion paper [24], the healing recovery indices will be correlated to an Index of Crack Healing, evaluated both through visual image analysis of the healed cracks as well as through a tailored indirect method, proposed by the first authors in a previous study [3]. This method is based on the comparative analysis of the damage evolution curves built for both the pre-cracked and the healed stages from the evaluation of the flexural stiffness.…”

Section: Introductionmentioning

confidence: 99%

“…A few investigations were performed in the past on the self-healing capacity of ordinary Fibre Reinforced Concrete (FRC), with different types of fibres and under different exposure conditions, demonstrating the ability of the tested specimens to recover their strength and stiffness, at different levels depending on the aforementioned variables [1,3,[10][11][12]. Interestingly, it was also observed that in the case of higher volume percentages of fibres, the same fibres were able to better promote self-healing in the sense that they constitute a network supporting the formation and increase of crystals between the faces of the cracks.…”

Section: Introductionmentioning

confidence: 99%

“…As a matter of fact, because such a capacity turned out to be quite randomly scattered and thus neither reliable nor predictable in an engineering application perspective, a paramount effort is currently challenging the concrete research community: "engineering" self-healing capacity of concrete and cement based construction materials. With that purpose, tailored mix design concepts and related additions are being investigated with the aim of making healing less scattered and hence more reliable, predictable and able to be controlled and regulated as required by the anticipated service and exposure conditions [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Effects of autogenous healing on the recovery of mechanical performance of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs): Part 1

Ferrara

Krelani

Moretti

et al. 2017

Cement and Concrete Composites

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This paper presents the results are shown of a thorough characterization of the selfhealing capacity of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs). The capacity of the material will be investigated to completely or partially re-seal the cracks, as a function of its composition, maximum crack width and exposure conditions. The analysis will also consider different flow-induced alignments of fibres, which can result into either strain-hardening or softening behaviour, whether the material is stressed parallel or perpendicularly to the fibres, respectively. Beam specimens, initially pre-cracked in 4-point bending up to different values of crack opening, were submitted to different exposure conditions, including water immersion, exposure to humid or dry air, and wet-and-dry cycles. After scheduled exposure times, ranging from one month to two years, specimens were tested up to failure according to the same test set-up employed for pre-cracking. Outcomes of the self-healing phenomenon, if any, were analyzed in terms of recovery of stiffness, strength and ductility. In a durability-based design framework, self-healing indices quantifying the recovery of mechanical properties were also defined and their significance crosschecked.

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Recent Advances in Intrinsic Self‐Healing Cementitious Materials

et al. 2018

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Self-healing is a natural phenomenon whereby living organisms respond to damage. Recently, considerable research efforts have been invested in self-healing cementitious materials that are capable of restoring structural integrity and mechanical properties after being damaged. Inspired by nature, a variety of creative approaches are explored here based on the intrinsic or extrinsic healing mechanism. Research on new intrinsic self-healing cementitious materials with biomimetic features is on the forefront of material science, which provides a promising way to construct resilient and sustainable concrete infrastructures. Here, the current advances in the development of the intrinsic healing cementitious materials are described, and a new definition of intrinsic self-healing discussed. The methods to assess the efficiency of different healing mechanisms are briefly summarized. The critical insights are emphasized to guide the future research on the development of new self-healing cementitious materials.

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A “fracture testing” based approach to assess crack healing of concrete with and without crystalline admixtures

Cited by 233 publications

References 24 publications

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Effects of autogenous healing on the recovery of mechanical performance of High Performance Fibre Reinforced Cementitious Composites (HPFRCCs): Part 1

Recent Advances in Intrinsic Self‐Healing Cementitious Materials

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