Evaluation of the Properties of Self-Repairing Epoxy-Cement Composite

Łukowski, P.; Adamczewski, Grzegorz

doi:10.1515/rbm-2012-6523

Cited by 4 publications

(10 citation statements)

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“…This is hereafter referred to as the ultrasonic self-sealing ratio,

where

and

are the average ultrasonic pulse velocities for a group of control samples (without cracks) of a given mortar at the time points t i and t 0 , respectively;

is the average ultrasonic pulse velocity for a group of samples (with cracks) of a given mortar at a point in time t i ; and

is the average ultrasonic pulse velocity for a group of samples of a given mortar for the state immediately after cracks were induced. Łukowski and Adamczewski [ 14 ] proposed a “self-repair degree” measure based on compressive strength test results, defined with an analogous mathematical formula.…”

Section: Absolute and Relative Changes In Upvmentioning

confidence: 99%

“…During the research on the self-healing of cement-based composites, when assessing the scale of the changes caused by autogenous self-healing in particular, the change in material properties over time through the progressive hydration of binders [ 14 , 15 , 16 ] should be considered. Figure 1 presents a general diagram of changes in cement-based composite strength during maturation and the restoration of strength during self-healing (at any time point t i of the research) that was lost due to material degradation (at time point t 0 ).…”

Section: Introductionmentioning

confidence: 99%

“…Some of the changes registered during the tests as self-healing effects result from the natural course of further hydration of the binder (value “D”). The strength gain due to pure self-healing (value “C”) is the difference between the total strength gain during self-healing (value “B”) and the strength gain due to further hydration of the binder (value “D”) [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

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Self-Sealing Process Evaluation Method Using Ultrasound Technique in Cement Composites with Mineral Additives

2020

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The self-sealing process, associated with chemical and microstructural changes inside damaged cement-based composites, leads to the recovery of the original material integrity. Assessing the magnitude of internal changes in samples using non-destructive techniques to capture only the self-sealing effects is difficult. The challenge is evaluating the differences between subsequent observations in time and between samples with different properties. This paper proposes a new approach to the use of an ultrasonic technique for self-sealing investigation. The method allows the quantification of material changes strictly related to self-sealing processes, excluding changes caused by the naturally progressing hydration of binders. The applied ultrasonic pulse velocity (UPV) data processing procedure allows the investigation of material changes inside and near the cracks, the effects of stimulating the self-sealing of cement composites with mineral additives, and the assessment of changes over time. An important aspect of the method is the sample preparation procedure and testing conditions that reduce the impact of moisture content on the UPV measurements. New parameters allowing the quantitative characterization of the self-sealing process are proposed. The method was evaluated using cement mortars modified with siliceous fly ash with induced cracks 0 to 750 µm wide, which were then cured in water for 152 days. The maximum degree of effective crack filling as a result of autogenous self-sealing in the tested mortars was determined to range from 33% to 57%. Observations of the microstructure of the crack surface confirmed that apart from the volume of the newly formed products, the density of these products may have a key impact on the ultrasonic measurements of the self-sealing performance. The studies were supplemented by the examination of the compression strength of mortars, mortar sample scanning and computer image processing, and observations using an optical microscope and scanning electron microscope with energy dispersive spectroscopy.

show abstract

“…This is hereafter referred to as the ultrasonic self-sealing ratio,

where

and

are the average ultrasonic pulse velocities for a group of control samples (without cracks) of a given mortar at the time points t i and t 0 , respectively;

is the average ultrasonic pulse velocity for a group of samples (with cracks) of a given mortar at a point in time t i ; and

Section: Absolute and Relative Changes In Upvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self-Sealing Process Evaluation Method Using Ultrasound Technique in Cement Composites with Mineral Additives

2020

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“…Lee et al [46] investigated the effect of dry curing followed the accelerated-cured-hardener-free-epoxy modified mortars. By using similar system, Lucowski and Adamezewski [47] studied the self repairing degree as a function of polymer/cement and binder/aggregate ratios. On the other hand, Ertug et al [48] tested a natural polymer-based hydrogel (chitosan) as a self healing material in cement mortars.…”

Section: Test Methods and Applicationsmentioning

confidence: 99%

Report from 13<sup>th</sup> ICPIC and 7<sup>th</sup> ASPIC: New Trends on Concrete-Polymer Composites

Aguiar

Özkul

Cunha

2013

AMR

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The field of polymers in concrete is consolidated in the construction industry. The future of polymers in concrete is governed by the synergic interaction between these materials, in order to contribute significantly towards a more sustainable construction. Concrete-polymer composites (C-PC) have excellent mechanical and durability properties. Appropriate combination of polymers and classical construction materials provides opportunities for innovative applications and systems. This paper highlights the innovations and new approaches presented at the 13th International Congress on Polymers in Concrete in Madeira, Portugal, 2010 and at the 7th Asian Symposium on Polymers in Concrete in Istanbul, Turkey, 2012. The new trends presented are related with the micro and nanostructure, properties, test methods and applications of concrete-polymer composites.

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“…Various possibilities of self-repairing have been briefly described in the paper. The particular attention has been paid to the use of epoxy resin without hardener, which is an idea initiated and first investigated by Y. Ohama [3], now developed by the authors [4].…”

Section: Introductionmentioning

confidence: 99%

Self-repairing of polymer-cement concrete

Łukowski¹,

Adamczewski²

2013

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract. Self-repairing means ability to the total or partial recovering of the properties which were worsened as a consequence of damage of the material. The subject of the paper is evaluation of ability to self-repair of a cement composite modified with epoxy resin without a hardener. The methodology of investigation of self-repairing building materials, developed by the authors, has been described, with controllable enforcing of the limited weakening of the material. Also, the self-repair degree has been defined as the measure of self-repairing ability of the building composites. The material model of the epoxy-cement composite has been developed on the basis of the tests results. The material optimization of the composite towards the maximum self-repairing ability has also been carried out. The results of investigation have confirmed the possibility of self-repairing of the cement composite modified with the epoxy resin without hardener. The conclusion and further research needs in the range of the self-repairing epoxy-cement composites have been pointed out.

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Evaluation of the Properties of Self-Repairing Epoxy-Cement Composite

Cited by 4 publications

References 0 publications

Self-Sealing Process Evaluation Method Using Ultrasound Technique in Cement Composites with Mineral Additives

Self-Sealing Process Evaluation Method Using Ultrasound Technique in Cement Composites with Mineral Additives

Report from 13<sup>th</sup> ICPIC and 7<sup>th</sup> ASPIC: New Trends on Concrete-Polymer Composites

Self-repairing of polymer-cement concrete

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