Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures

M. S. Meddah, M. Suzuki, R. Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The use of high-performance concrete (HPC) in reinforced concrete structures and various infrastructures has spectacularly increased in the last two decades. In fact, HPC offers a combination of mechanical performance and durability enhancement that cannot always be achieved by using conventional concrete materials. On the other hand, this type of concrete is known by its high sensitivity to early-age cracking as a result of the large magnitude of early-autogenous shrinkage exhibited which is strongly related to the two main requirements of HPC: a low water-tobinder mass ratio (w/b) and the inclusion of ultrafine supplemental cementitious materials such as silica fume. It has been proven that internal capillary stress induced during cement hydration reactions progress is the major cause of cracking and consequently, premature damage in HPC. Therefore, HPC requires a special curing practice and mix proportions, particularly at early-age when concrete is still weaker and not yet developed an adequate tensil e strength to counteract the internal tensile stresses exhibited. In this paper, self-stress induced during the evolution of autogenous shrinkage strains, especially at early-age was investigated on three different HPC types. Silica fume HPCs made with three different low w/b of 0.15, 0.23, and 0.30. Shrinkage reducing agent (SRA) and expansive additive (EXA) were combined and added to HPC mixtures to reduce autogenous shrinkage magnitude. The results have shown that the larger the magnitude of autogenous shrinkage developed, the higher the induced internal capillary stress. It has been found that for the reference concretes; more than 90% of the ultimate capillary tensile stress was developed during the first 24 hours. However, adding a combination of SRA and EXA results in a significant reduce of bath autogenous shrinkage and the induced stress. Furthermore, the use of a combination of SRA and EXA has revealed that the internal stress develops gradually compared to the fast development observed with the reference concrete mixtures. Moreover, the inclusion of SRA and EXA has resulted in a slight decrease of the compressive strength and young's modulus bath at early and later ages. It can be stated that using a proper content of this combination of (SRA+EXA) could result in a SF-HP concretes with very low-autogenous shrinkage even non-shrinking HPC and consequently, low tensile stress and low tendency to earl-age cracking which results in a durable concrete structure.

Original languageEnglish
Title of host publication11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future
PublisherStructural Engineering Conferences (SECON) Zagreb, Croatia, 2007
Publication statusPublished - 2009
Event11th Annual International fib Symposium on Concrete: 21st Century Superhero - London, United Kingdom
Duration: Jun 22 2009Jun 24 2009

Other

Other11th Annual International fib Symposium on Concrete: 21st Century Superhero
CountryUnited Kingdom
CityLondon
Period6/22/096/24/09

Fingerprint

High performance concrete
Concretes
Reducing agents
Tensile stress
Silica fume
Concrete mixtures
Concrete construction
Residual stresses
Hydration
Compressive strength
Reinforced concrete
Curing
Cements
Durability
Elastic moduli

Keywords

  • Autogenous deformations
  • Expansive additive
  • Internal stress
  • Shrinkage reducing agent
  • Silica fume

ASJC Scopus subject areas

  • Architecture
  • Building and Construction
  • Civil and Structural Engineering

Cite this

Meddah, M. S., Suzuki, M., & Sato, R. (2009). Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures. In 11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007.

Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures. / Meddah, M. S.; Suzuki, M.; Sato, R.

11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future. Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007, 2009.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Meddah, MS, Suzuki, M & Sato, R 2009, Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures. in 11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future. Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007, 11th Annual International fib Symposium on Concrete: 21st Century Superhero, London, United Kingdom, 6/22/09.
Meddah MS, Suzuki M, Sato R. Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures. In 11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future. Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007. 2009
Meddah, M. S. ; Suzuki, M. ; Sato, R. / Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures. 11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future. Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007, 2009.
@inproceedings{27a157f967f94891a4e1bc106c7a9cdb,
title = "Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures",
abstract = "The use of high-performance concrete (HPC) in reinforced concrete structures and various infrastructures has spectacularly increased in the last two decades. In fact, HPC offers a combination of mechanical performance and durability enhancement that cannot always be achieved by using conventional concrete materials. On the other hand, this type of concrete is known by its high sensitivity to early-age cracking as a result of the large magnitude of early-autogenous shrinkage exhibited which is strongly related to the two main requirements of HPC: a low water-tobinder mass ratio (w/b) and the inclusion of ultrafine supplemental cementitious materials such as silica fume. It has been proven that internal capillary stress induced during cement hydration reactions progress is the major cause of cracking and consequently, premature damage in HPC. Therefore, HPC requires a special curing practice and mix proportions, particularly at early-age when concrete is still weaker and not yet developed an adequate tensil e strength to counteract the internal tensile stresses exhibited. In this paper, self-stress induced during the evolution of autogenous shrinkage strains, especially at early-age was investigated on three different HPC types. Silica fume HPCs made with three different low w/b of 0.15, 0.23, and 0.30. Shrinkage reducing agent (SRA) and expansive additive (EXA) were combined and added to HPC mixtures to reduce autogenous shrinkage magnitude. The results have shown that the larger the magnitude of autogenous shrinkage developed, the higher the induced internal capillary stress. It has been found that for the reference concretes; more than 90{\%} of the ultimate capillary tensile stress was developed during the first 24 hours. However, adding a combination of SRA and EXA results in a significant reduce of bath autogenous shrinkage and the induced stress. Furthermore, the use of a combination of SRA and EXA has revealed that the internal stress develops gradually compared to the fast development observed with the reference concrete mixtures. Moreover, the inclusion of SRA and EXA has resulted in a slight decrease of the compressive strength and young's modulus bath at early and later ages. It can be stated that using a proper content of this combination of (SRA+EXA) could result in a SF-HP concretes with very low-autogenous shrinkage even non-shrinking HPC and consequently, low tensile stress and low tendency to earl-age cracking which results in a durable concrete structure.",
keywords = "Autogenous deformations, Expansive additive, Internal stress, Shrinkage reducing agent, Silica fume",
author = "Meddah, {M. S.} and M. Suzuki and R. Sato",
year = "2009",
language = "English",
booktitle = "11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future",
publisher = "Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007",

}

TY - GEN

T1 - Self-induced stress in highperformance concrete treated with a combination of shrinkage-reducing and expansive admixtures

AU - Meddah, M. S.

AU - Suzuki, M.

AU - Sato, R.

PY - 2009

Y1 - 2009

N2 - The use of high-performance concrete (HPC) in reinforced concrete structures and various infrastructures has spectacularly increased in the last two decades. In fact, HPC offers a combination of mechanical performance and durability enhancement that cannot always be achieved by using conventional concrete materials. On the other hand, this type of concrete is known by its high sensitivity to early-age cracking as a result of the large magnitude of early-autogenous shrinkage exhibited which is strongly related to the two main requirements of HPC: a low water-tobinder mass ratio (w/b) and the inclusion of ultrafine supplemental cementitious materials such as silica fume. It has been proven that internal capillary stress induced during cement hydration reactions progress is the major cause of cracking and consequently, premature damage in HPC. Therefore, HPC requires a special curing practice and mix proportions, particularly at early-age when concrete is still weaker and not yet developed an adequate tensil e strength to counteract the internal tensile stresses exhibited. In this paper, self-stress induced during the evolution of autogenous shrinkage strains, especially at early-age was investigated on three different HPC types. Silica fume HPCs made with three different low w/b of 0.15, 0.23, and 0.30. Shrinkage reducing agent (SRA) and expansive additive (EXA) were combined and added to HPC mixtures to reduce autogenous shrinkage magnitude. The results have shown that the larger the magnitude of autogenous shrinkage developed, the higher the induced internal capillary stress. It has been found that for the reference concretes; more than 90% of the ultimate capillary tensile stress was developed during the first 24 hours. However, adding a combination of SRA and EXA results in a significant reduce of bath autogenous shrinkage and the induced stress. Furthermore, the use of a combination of SRA and EXA has revealed that the internal stress develops gradually compared to the fast development observed with the reference concrete mixtures. Moreover, the inclusion of SRA and EXA has resulted in a slight decrease of the compressive strength and young's modulus bath at early and later ages. It can be stated that using a proper content of this combination of (SRA+EXA) could result in a SF-HP concretes with very low-autogenous shrinkage even non-shrinking HPC and consequently, low tensile stress and low tendency to earl-age cracking which results in a durable concrete structure.

AB - The use of high-performance concrete (HPC) in reinforced concrete structures and various infrastructures has spectacularly increased in the last two decades. In fact, HPC offers a combination of mechanical performance and durability enhancement that cannot always be achieved by using conventional concrete materials. On the other hand, this type of concrete is known by its high sensitivity to early-age cracking as a result of the large magnitude of early-autogenous shrinkage exhibited which is strongly related to the two main requirements of HPC: a low water-tobinder mass ratio (w/b) and the inclusion of ultrafine supplemental cementitious materials such as silica fume. It has been proven that internal capillary stress induced during cement hydration reactions progress is the major cause of cracking and consequently, premature damage in HPC. Therefore, HPC requires a special curing practice and mix proportions, particularly at early-age when concrete is still weaker and not yet developed an adequate tensil e strength to counteract the internal tensile stresses exhibited. In this paper, self-stress induced during the evolution of autogenous shrinkage strains, especially at early-age was investigated on three different HPC types. Silica fume HPCs made with three different low w/b of 0.15, 0.23, and 0.30. Shrinkage reducing agent (SRA) and expansive additive (EXA) were combined and added to HPC mixtures to reduce autogenous shrinkage magnitude. The results have shown that the larger the magnitude of autogenous shrinkage developed, the higher the induced internal capillary stress. It has been found that for the reference concretes; more than 90% of the ultimate capillary tensile stress was developed during the first 24 hours. However, adding a combination of SRA and EXA results in a significant reduce of bath autogenous shrinkage and the induced stress. Furthermore, the use of a combination of SRA and EXA has revealed that the internal stress develops gradually compared to the fast development observed with the reference concrete mixtures. Moreover, the inclusion of SRA and EXA has resulted in a slight decrease of the compressive strength and young's modulus bath at early and later ages. It can be stated that using a proper content of this combination of (SRA+EXA) could result in a SF-HP concretes with very low-autogenous shrinkage even non-shrinking HPC and consequently, low tensile stress and low tendency to earl-age cracking which results in a durable concrete structure.

KW - Autogenous deformations

KW - Expansive additive

KW - Internal stress

KW - Shrinkage reducing agent

KW - Silica fume

UR - http://www.scopus.com/inward/record.url?scp=85009874576&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85009874576&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85009874576

BT - 11th Annual International fib Symposium - Concrete: 21st Century Superhero: Building a Sustainable Future

PB - Structural Engineering Conferences (SECON) Zagreb, Croatia, 2007

ER -