Characterising the segregation of self‑consolidating concrete using ultrasonic pulse velocity

G. Abdelouahab, B. Abdelhalim, Debra Laefer

Research output: Contribution to journalArticle

Abstract

Segregation is the unintentional separation of the fresh components of concrete or mortar, which can have negative impacts on the mechanical, transport and durability properties of the cured product. The problem is acute in self-consolidating concrete (SCC), because of its high fluidity level. To help evaluate segregation, this paper investigates the potential of using ultrasonic pulse velocity (UPV) as a means to identify and characterise segregation in traditional and SCC mixes. Fourteen different concrete mixes were tested using standard techniques (sieve and column) in comparison with the UPV-based test proposed herein. Six of the 14 concrete mixtures were stable, as indicated by having sieve segregation indices lower than 15% and segregation resistances (f) higher than 95%. These six stable samples displayed UPV segregation index values (fu) approaching 100%. The remaining samples were found to be unstable concretes with sieve segregation index values higher than 15% and resistance index values lower than 65%. These concretes could also be clearly identified as unstable by a UPV segregation index lower than 80%. The UPV method provides a clean, quick and easy nondestructive alternative for testing segregation of both fresh and hardened concrete.

Original languageEnglish (US)
Pages (from-to)26-37
Number of pages12
JournalJournal of the South African Institution of Civil Engineering
Volume61
Issue number1
DOIs
StatePublished - Mar 1 2019

Fingerprint

Ultrasonics
Concretes
Sieves
Concrete mixtures
Fluidity
Mortar
Durability
Testing

Keywords

  • Column test
  • Concrete segregation
  • Self-consolidating concrete
  • Sieve stability test
  • Ultrasonic pulse velocity

ASJC Scopus subject areas

  • Civil and Structural Engineering

Cite this

Characterising the segregation of self‑consolidating concrete using ultrasonic pulse velocity. / Abdelouahab, G.; Abdelhalim, B.; Laefer, Debra.

In: Journal of the South African Institution of Civil Engineering, Vol. 61, No. 1, 01.03.2019, p. 26-37.

Research output: Contribution to journalArticle

@article{f9bd962b0e504d1689037179cb60560c,
title = "Characterising the segregation of self‑consolidating concrete using ultrasonic pulse velocity",
abstract = "Segregation is the unintentional separation of the fresh components of concrete or mortar, which can have negative impacts on the mechanical, transport and durability properties of the cured product. The problem is acute in self-consolidating concrete (SCC), because of its high fluidity level. To help evaluate segregation, this paper investigates the potential of using ultrasonic pulse velocity (UPV) as a means to identify and characterise segregation in traditional and SCC mixes. Fourteen different concrete mixes were tested using standard techniques (sieve and column) in comparison with the UPV-based test proposed herein. Six of the 14 concrete mixtures were stable, as indicated by having sieve segregation indices lower than 15{\%} and segregation resistances (f) higher than 95{\%}. These six stable samples displayed UPV segregation index values (fu) approaching 100{\%}. The remaining samples were found to be unstable concretes with sieve segregation index values higher than 15{\%} and resistance index values lower than 65{\%}. These concretes could also be clearly identified as unstable by a UPV segregation index lower than 80{\%}. The UPV method provides a clean, quick and easy nondestructive alternative for testing segregation of both fresh and hardened concrete.",
keywords = "Column test, Concrete segregation, Self-consolidating concrete, Sieve stability test, Ultrasonic pulse velocity",
author = "G. Abdelouahab and B. Abdelhalim and Debra Laefer",
year = "2019",
month = "3",
day = "1",
doi = "10.17159/2309-8775/2019/v61n1a3",
language = "English (US)",
volume = "61",
pages = "26--37",
journal = "Journal of the South African Institution of Civil Engineering",
issn = "1021-2019",
publisher = "South African Institute of Civil Engineers",
number = "1",

}

TY - JOUR

T1 - Characterising the segregation of self‑consolidating concrete using ultrasonic pulse velocity

AU - Abdelouahab, G.

AU - Abdelhalim, B.

AU - Laefer, Debra

PY - 2019/3/1

Y1 - 2019/3/1

N2 - Segregation is the unintentional separation of the fresh components of concrete or mortar, which can have negative impacts on the mechanical, transport and durability properties of the cured product. The problem is acute in self-consolidating concrete (SCC), because of its high fluidity level. To help evaluate segregation, this paper investigates the potential of using ultrasonic pulse velocity (UPV) as a means to identify and characterise segregation in traditional and SCC mixes. Fourteen different concrete mixes were tested using standard techniques (sieve and column) in comparison with the UPV-based test proposed herein. Six of the 14 concrete mixtures were stable, as indicated by having sieve segregation indices lower than 15% and segregation resistances (f) higher than 95%. These six stable samples displayed UPV segregation index values (fu) approaching 100%. The remaining samples were found to be unstable concretes with sieve segregation index values higher than 15% and resistance index values lower than 65%. These concretes could also be clearly identified as unstable by a UPV segregation index lower than 80%. The UPV method provides a clean, quick and easy nondestructive alternative for testing segregation of both fresh and hardened concrete.

AB - Segregation is the unintentional separation of the fresh components of concrete or mortar, which can have negative impacts on the mechanical, transport and durability properties of the cured product. The problem is acute in self-consolidating concrete (SCC), because of its high fluidity level. To help evaluate segregation, this paper investigates the potential of using ultrasonic pulse velocity (UPV) as a means to identify and characterise segregation in traditional and SCC mixes. Fourteen different concrete mixes were tested using standard techniques (sieve and column) in comparison with the UPV-based test proposed herein. Six of the 14 concrete mixtures were stable, as indicated by having sieve segregation indices lower than 15% and segregation resistances (f) higher than 95%. These six stable samples displayed UPV segregation index values (fu) approaching 100%. The remaining samples were found to be unstable concretes with sieve segregation index values higher than 15% and resistance index values lower than 65%. These concretes could also be clearly identified as unstable by a UPV segregation index lower than 80%. The UPV method provides a clean, quick and easy nondestructive alternative for testing segregation of both fresh and hardened concrete.

KW - Column test

KW - Concrete segregation

KW - Self-consolidating concrete

KW - Sieve stability test

KW - Ultrasonic pulse velocity

UR - http://www.scopus.com/inward/record.url?scp=85067197088&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067197088&partnerID=8YFLogxK

U2 - 10.17159/2309-8775/2019/v61n1a3

DO - 10.17159/2309-8775/2019/v61n1a3

M3 - Article

AN - SCOPUS:85067197088

VL - 61

SP - 26

EP - 37

JO - Journal of the South African Institution of Civil Engineering

JF - Journal of the South African Institution of Civil Engineering

SN - 1021-2019

IS - 1

ER -