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Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete. / Qureshi, T. S.; Kanellopoulos, A.; Al-Tabbaa, A.

In: Construction and Building Materials, Vol. 121, 15.09.2016, p. 629-643.

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@article{19501666f2f242f09eb4390d3f492d3d,
title = "Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete",
abstract = "This study presents the application of encapsulated expansive powder minerals (magnesium oxide, bentonite and quicklime) for self-healing of cement-based mortars. A system of concentric glass macrocapsules was used to envelope the expansive minerals (outer capsule) and water (inner capsule). Mortar samples containing concentric macrocapsules with different mineral combinations were cracked and healed under three different curing regimes; ambient conditions, high humidity exposure and immersed in water. Self-healing was assessed based on visual crack sealing, mechanical strength recovery and improvement in durability investigated by means of capillary sorption tests. Micro-structural analysis of the healing materials was investigated using FT-IR, XRD and SEM-EDX for exploring self-healing kinetics. Immersed in water have yielded the optimum healing efficiency with ∼95% crack sealing and ∼25% strength recovery in 28 days. Data showed an increasing trend in 56 days for both crack sealing and load recovery. The improvement in terms of capillary absorption of healed samples was also significant after 28 days of healing. Self-healing kinetics revealed that the expansive minerals were hydrated in the initial healing period and slowly carbonated over time until the peripheral crack zone became adequately water tight.",
keywords = "Crack sealing, Durability, Expansion, Materials microstructure, Powder mineral encapsulation, Self-healing kinetics, Strength recovery",
author = "Qureshi, {T. S.} and A. Kanellopoulos and A. Al-Tabbaa",
note = "{\textcopyright} 2016 The Author(s). Published by Elsevier Ltd. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. ",
year = "2016",
month = sep,
day = "15",
doi = "10.1016/j.conbuildmat.2016.06.030",
language = "English",
volume = "121",
pages = "629--643",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier Ltd",

}

RIS

TY - JOUR

T1 - Encapsulation of expansive powder minerals within a concentric glass capsule system for self-healing concrete

AU - Qureshi, T. S.

AU - Kanellopoulos, A.

AU - Al-Tabbaa, A.

N1 - © 2016 The Author(s). Published by Elsevier Ltd. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

PY - 2016/9/15

Y1 - 2016/9/15

N2 - This study presents the application of encapsulated expansive powder minerals (magnesium oxide, bentonite and quicklime) for self-healing of cement-based mortars. A system of concentric glass macrocapsules was used to envelope the expansive minerals (outer capsule) and water (inner capsule). Mortar samples containing concentric macrocapsules with different mineral combinations were cracked and healed under three different curing regimes; ambient conditions, high humidity exposure and immersed in water. Self-healing was assessed based on visual crack sealing, mechanical strength recovery and improvement in durability investigated by means of capillary sorption tests. Micro-structural analysis of the healing materials was investigated using FT-IR, XRD and SEM-EDX for exploring self-healing kinetics. Immersed in water have yielded the optimum healing efficiency with ∼95% crack sealing and ∼25% strength recovery in 28 days. Data showed an increasing trend in 56 days for both crack sealing and load recovery. The improvement in terms of capillary absorption of healed samples was also significant after 28 days of healing. Self-healing kinetics revealed that the expansive minerals were hydrated in the initial healing period and slowly carbonated over time until the peripheral crack zone became adequately water tight.

AB - This study presents the application of encapsulated expansive powder minerals (magnesium oxide, bentonite and quicklime) for self-healing of cement-based mortars. A system of concentric glass macrocapsules was used to envelope the expansive minerals (outer capsule) and water (inner capsule). Mortar samples containing concentric macrocapsules with different mineral combinations were cracked and healed under three different curing regimes; ambient conditions, high humidity exposure and immersed in water. Self-healing was assessed based on visual crack sealing, mechanical strength recovery and improvement in durability investigated by means of capillary sorption tests. Micro-structural analysis of the healing materials was investigated using FT-IR, XRD and SEM-EDX for exploring self-healing kinetics. Immersed in water have yielded the optimum healing efficiency with ∼95% crack sealing and ∼25% strength recovery in 28 days. Data showed an increasing trend in 56 days for both crack sealing and load recovery. The improvement in terms of capillary absorption of healed samples was also significant after 28 days of healing. Self-healing kinetics revealed that the expansive minerals were hydrated in the initial healing period and slowly carbonated over time until the peripheral crack zone became adequately water tight.

KW - Crack sealing

KW - Durability

KW - Expansion

KW - Materials microstructure

KW - Powder mineral encapsulation

KW - Self-healing kinetics

KW - Strength recovery

UR - http://www.scopus.com/inward/record.url?scp=84975068538&partnerID=8YFLogxK

U2 - 10.1016/j.conbuildmat.2016.06.030

DO - 10.1016/j.conbuildmat.2016.06.030

M3 - Article

AN - SCOPUS:84975068538

VL - 121

SP - 629

EP - 643

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -