Effect of a crystalline admixture on the self-healing capability of high-performance fiber reinforced concretes in service conditions

Escoffres, P.; Desmettre, Clélia; Charron, Jean‐Philippe

doi:10.1016/j.conbuildmat.2018.04.003

Cited by 87 publications

(65 citation statements)

References 27 publications

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“…In report, there was calcium carbonate formed as the self‐healing product in presence of crystalline admixture in cementitious materials . The consequence of carbonation is the densification of the cement matrix and reduction of its porosity and permeability (capillary), which constitutes a positive process with respect to the pores sealing of the cement …”

Section: Resultsmentioning

confidence: 99%

“…Cementitious capillary crystalline waterproofing (CCCW) material is a kind of rigid waterproof material which is composed of ordinary Portland cement, fine quartz sand (or silica sand) as the base material and mixed with active chemicals . The active ingredients from CCCW coating can penetrate into the cement matrix through the carrier of moisture and react with hydration products to form crystalline or gelatinous substances which fill the capillary pores and micro cracks . The main application of CCCW material is to improve the densification, impermeability, and self‐healing capability of concrete structures …”

Section: Introductionmentioning

confidence: 99%

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Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

Zhang

Zuo

Yang

et al. 2019

Structural Concrete

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This study presents an experimental investigation in the effect of cementitious capillary crystalline waterproofing (CCCW) coating on the gas permeability of mortar and the mechanism how the gas permeability is affected. The gas permeability coefficient of mortar coated with or without CCCW material was measured through modified Cembureau method. The pore structure, micromorphology and hydration products of cement paste with or without CCCW coating were analyzed by the means of mercury intrusion porosimetry (MIP), scanning electron microscopyenergy disperse spectroscopy (SEM-EDS), X-ray diffraction (XRD) and thermogravimetry-differential scanning calorimetry (TG-DSC). The results showed that under the effect of CCCW coating, the gas permeability of mortar got decreased and the pore structure changed towards smaller pore sizes. SEM-EDS results exhibited that there was a large amount of ettringite filling in the pores in the paste with CCCW coating. XRD and TG-DSC analysis indicated that there was more calcium carbonate formed in the paste with CCCW coating than blank paste. The formation of ettringite in pores and increased calcium carbonate production refines the pore size distribution and densifies the cement matrix, which induces the decrease in gas permeability of mortar coated with CCCW material. K E Y W O R D SCaCO 3 , cementitious capillary crystalline waterproofing material, ettringite, gas permeability, hydration products, microstructure

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

Zhang

Zuo

Yang

et al. 2019

Structural Concrete

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“…The restless search for durability and resilience of concrete structures has led some researchers to focus on self-healing concrete composites with the built-in ability of repairing narrow cracks without human or external intervention [ 2 , 3 , 4 , 5 ]. Two major types of self-healing concretes have emerged: the autogenous type [ 4 ], which is achieved by autogenous healing materials such as mineral admixtures like ground-granulated blast-furnace slag (GGBFS), silica fume or fly ash, fibers and nanofillers [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ]; and, the autonomous type [ 3 ], which is realized by unconventional engineered additions such as shape memory alloys, capsules, polymers or bacteria to seal the cracks [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Autogenous healing is an old and well-known phenomenon that originates naturally from the cementitious material like the hydration of clinker minerals or the carbonation of calcium hydroxide while autonomous healing requires a trigger to activate the process.…”

Section: Introductionmentioning

confidence: 99%

“…The methods usually adopted are chloride permeability test, water permeability test, isothermal calorimetry, crack closing test, etc. [ 12 , 25 ]. However, as pointed out by Guo and Chidiac [ 27 ], self-healing of concrete is made up of two concurrent concepts: self-sealing of cracks, which requires plugging of openings for durability, and self-healing of cracks, which refers to recovery of mechanical properties for strength.…”

Section: Introductionmentioning

confidence: 99%

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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“…Various researchers have investigated the self-healing mechanisms in cement based materials, including the experimental methods and techniques which have been employed to characterize and quantify the self-sealing and/or self-healing capacity of cement-based materials, the effectiveness of the different self-sealing and/or self-healing engineering techniques, and also the methods for the analysis of the chemical composition and intrinsic nature of the self-healing products (Liberato et al, 2018). Cement based materials incorporating supplementary cementitious materials and also self-healing enhancing crystalline admixtures have been developed and their effectiveness and capacity for crack sealing has been investigated in different environments such as chloride-rich environments (Ferrara et al, 2014(Ferrara et al, , 2016Borg et al, 2018b;Cuenca et al, 2018;Escoffres et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The Application of Lysinibacillus sphaericus for Surface Treatment and Crack Healing in Mortar

Farrugia

Borg

Ferrara

et al. 2019

Front. Built Environ.

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Micro-cracks, which develop during the service life of reinforced concrete structures, reduce the durability of concrete through the penetration of fluids. Microbially-induced calcium carbonate precipitation (MICP) occurs naturally in the presence of ureolytic bacteria which precipitate calcium carbonate (CaCO 3) through urea hydrolysis. This deposition leads to the filling of micro-cracks and sealing of pores, reducing ingress of fluids into the concrete. The research aims were to assess the potential of Lysinibacillus sphaericus for healing cracks in concrete and to study the effects of this treatment on the absorption properties of treated concrete. Lysinibacillus sphaericus was cultivated in vitro and induction of MICP through urea hydrolysis was tested on cement paste with two different calcium sources. The calcium precipitates where characterized by light microscopy, Scanning Electron Microscopy, Energy Dispersive Spectroscopy and Fourier Transform Infrared Spectroscopy. The final phase of the study involved testing of the crack healing capacity and the effect on absorption of the MICP process on mortar samples. These parameters were measured by means of visual examinations, light and digital microscopy, Ultrasonic Pulse Velocity (UPV), and absorption tests. The study confirmed that MICP is induced successfully on concrete using Lysinibacillus sphaericus. Samples exposed to repeated treatment cycles of Lysinibacillus sphaericus in the presence of a calcium source, exhibited a more extensive and even coating of CaCO 3 crystals on the surface confirming that repeated cycles of treatment are more effective in increasing the amount of CaCO 3 deposition and therefore increasing crack healing capacity. Digital microscopy and UPV analysis proved that this precipitate was successful in partially healing cracks in samples. Sorptivity tests confirmed this and showed that it was also successful as a surface treatment to reduce absorption.

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Effect of a crystalline admixture on the self-healing capability of high-performance fiber reinforced concretes in service conditions

Cited by 87 publications

References 27 publications

Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

Effect of cementitious capillary crystalline waterproofing coating on the gas permeability of mortar

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

The Application of Lysinibacillus sphaericus for Surface Treatment and Crack Healing in Mortar

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