Does a High Amount of Unhydrated Portland Cement Ensure an Effective Autogenous Self-Healing of Mortar?
Document identifier: oai:DiVA.org:ltu-76510
Access full text here:
10.3390/ma12203298Keyword: Engineering and Technology,
Materials Engineering,
Other Materials Engineering,
Teknik och teknologier,
Materialteknik,
Annan materialteknik,
Continued hydration,
Ultra-high performance concrete,
Cracking,
Microstructure,
Calcite,
Byggmaterial,
Building MaterialsPublication year: 2019Relevant Sustainable Development Goals (SDGs):
The SDG label(s) above have been assigned by OSDG.aiAbstract: It is commonly accepted that the autogenous self-healing of concrete is mainly controlled by the hydration of Portland cement and its extent depends on the availability of anhydrous particles. High-performance (HPCs) and ultra-high performance concretes (UHPCs) incorporating very high amounts of cement and having a low water-to-cement ratio reach the hydration degree of only 70–50%. Consequently, the presence of a large amount of unhydrated cement should result in excellent autogenous self-healing. The main aim of this study was to examine whether this commonly accepted hypothesis was correct. The study included tests performed on UHPC and mortars with a low water-to-cement ratio and high cement content. Additionally, aging effects were verified on 12-month-old UHPC samples. Analysis was conducted on the crack surfaces and inside of the cracks. The results strongly indicated that the formation of a dense microstructure and rapidly hydrating, freshly exposed anhydrous cement particles could significantly limit or even hinder the self-healing process. The availability of anhydrous cement appeared not to guarantee development of a highly effective healing process.
Authors
Magdalena Rajczakowska
Luleå tekniska universitet; Byggkonstruktion och brand
Other publications
>>
Lennart Nilsson
Luleå tekniska universitet; Institutionen för samhällsbyggnad och naturresurser
Other publications
>>
Karin Habermehl-Cwirzen
Luleå tekniska universitet; Byggkonstruktion och brand
Other publications
>>
Hans Hedlund
Luleå tekniska universitet; Byggkonstruktion och brand; Skanska, Stockholm, Sweden
Other publications
>>
Andrzej Cwirzen
Luleå tekniska universitet; Byggkonstruktion och brand
Other publications
>>
Record metadata
Click to view metadata
header:
identifier: oai:DiVA.org:ltu-76510
datestamp: 2021-04-19T12:52:53Z
setSpec: SwePub-ltu
metadata:
mods:
@attributes:
version: 3.7
recordInfo:
recordContentSource: ltu
recordCreationDate: 2019-10-25
identifier:
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76510
10.3390/ma12203298
2-s2.0-85074298266
titleInfo:
@attributes:
lang: eng
title: Does a High Amount of Unhydrated Portland Cement Ensure an Effective Autogenous Self-Healing of Mortar?
abstract: It is commonly accepted that the autogenous self-healing of concrete is mainly controlled by the hydration of Portland cement and its extent depends on the availability of anhydrous particles. High-performance (HPCs) and ultra-high performance concretes (UHPCs) incorporating very high amounts of cement and having a low water-to-cement ratio reach the hydration degree of only 70–50%. Consequently the presence of a large amount of unhydrated cement should result in excellent autogenous self-healing. The main aim of this study was to examine whether this commonly accepted hypothesis was correct. The study included tests performed on UHPC and mortars with a low water-to-cement ratio and high cement content. Additionally aging effects were verified on 12-month-old UHPC samples. Analysis was conducted on the crack surfaces and inside of the cracks. The results strongly indicated that the formation of a dense microstructure and rapidly hydrating freshly exposed anhydrous cement particles could significantly limit or even hinder the self-healing process. The availability of anhydrous cement appeared not to guarantee development of a highly effective healing process.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Engineering and Technology
Materials Engineering
Other Materials Engineering
@attributes:
lang: swe
authority: uka.se
topic:
Teknik och teknologier
Materialteknik
Annan materialteknik
@attributes:
lang: eng
topic: continued hydration
@attributes:
lang: eng
topic: ultra-high performance concrete
@attributes:
lang: eng
topic: cracking
@attributes:
lang: eng
topic: microstructure
@attributes:
lang: eng
topic: calcite
@attributes:
lang: swe
authority: ltu
topic: Byggmaterial
genre: Research subject
@attributes:
lang: eng
authority: ltu
topic: Building Materials
genre: Research subject
language:
languageTerm: eng
genre:
publication/journal-article
ref
note:
Published
5
Validerad;2019;Nivå 2;2019-10-28 (johcin)
name:
@attributes:
type: personal
authority: ltu
namePart:
Rajczakowska
Magdalena
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Byggkonstruktion och brand
nameIdentifier: magraj
@attributes:
type: personal
namePart:
Nilsson
Lennart
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Institutionen för samhällsbyggnad och naturresurser
@attributes:
type: personal
authority: ltu
namePart:
Habermehl-Cwirzen
Karin
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Byggkonstruktion och brand
nameIdentifier:
karhab
0000-0001-7279-6528
@attributes:
type: personal
authority: ltu
namePart:
Hedlund
Hans
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Byggkonstruktion och brand
Skanska Stockholm Sweden
nameIdentifier: hans
@attributes:
type: personal
authority: ltu
namePart:
Cwirzen
Andrzej
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Byggkonstruktion och brand
nameIdentifier:
andcwi
0000-0001-6287-2240
originInfo:
dateIssued: 2019
publisher: MDPI
relatedItem:
@attributes:
type: host
titleInfo:
title: Materials
identifier:
1996-1944
1996-1944
part:
detail:
@attributes:
type: volume
number: 12
@attributes:
type: issue
number: 20
@attributes:
type: artNo
number: 3298
physicalDescription:
form: print
typeOfResource: text