The University of Southampton
University of Southampton Institutional Repository

Monitoring the setting and early hardening of concrete using an ultrasonic waveguide

Monitoring the setting and early hardening of concrete using an ultrasonic waveguide
Monitoring the setting and early hardening of concrete using an ultrasonic waveguide
The use of an embedded waveguide to monitor the setting and early hardening of concrete has been investigated. The technique uses measurements of the attenuation of a guided wave propagating along the waveguide to obtain the shear velocity, and hence shear modulus, of the concrete. Tests have been carried out on mortar and concrete specimens monitored continuously over 48 hours. Over the first few hours, while the mortar/concrete was still fluid, the absolute rate of increase in shear modulus was low. From around 5 hours to around 20 hours, shear modulus increased linearly. Thereafter, shear modulus increased, but at an ever-decreasing rate. The shear velocity of the mortar was calculated to be 1720 m/s after two days, corresponding to a shear modulus of 5.6 GPa, while the 48 hour-old concrete had a shear modulus of 16.5 GPa. Repeated tests showed similar end states, but some differences in hardening rate; these were attributed either to temperature variations or to differences in mould geometry. The technique worked equally well on mortar and concrete, indicating that the presence of the large aggregate particles in concrete does not adversely affect the results.
1354-2575
350-354
Pu, S.H
49f83b8c-9c14-427f-8de3-44786dace734
Cegla, F.
92dca36d-dc7b-41db-98b5-74f0138a93f9
Drozdz, M.
1029adb2-7794-44ae-a971-7840a771ddf3
Lowe, M.J.S.
b76d95a8-35b0-4a62-9ea9-c7f9f331dcd8
Cawley, P.
ec0b9ab1-2f7d-4334-912a-c860bdb1c830
Buenfeld, N.R.
96664b28-eadb-4655-a152-2fddbbbf1d21
Pu, S.H
49f83b8c-9c14-427f-8de3-44786dace734
Cegla, F.
92dca36d-dc7b-41db-98b5-74f0138a93f9
Drozdz, M.
1029adb2-7794-44ae-a971-7840a771ddf3
Lowe, M.J.S.
b76d95a8-35b0-4a62-9ea9-c7f9f331dcd8
Cawley, P.
ec0b9ab1-2f7d-4334-912a-c860bdb1c830
Buenfeld, N.R.
96664b28-eadb-4655-a152-2fddbbbf1d21

Pu, S.H, Cegla, F., Drozdz, M., Lowe, M.J.S., Cawley, P. and Buenfeld, N.R. (2004) Monitoring the setting and early hardening of concrete using an ultrasonic waveguide. Insight, 46 (6), 350-354. (doi:10.1784/insi.46.6.350.56383).

Record type: Article

Abstract

The use of an embedded waveguide to monitor the setting and early hardening of concrete has been investigated. The technique uses measurements of the attenuation of a guided wave propagating along the waveguide to obtain the shear velocity, and hence shear modulus, of the concrete. Tests have been carried out on mortar and concrete specimens monitored continuously over 48 hours. Over the first few hours, while the mortar/concrete was still fluid, the absolute rate of increase in shear modulus was low. From around 5 hours to around 20 hours, shear modulus increased linearly. Thereafter, shear modulus increased, but at an ever-decreasing rate. The shear velocity of the mortar was calculated to be 1720 m/s after two days, corresponding to a shear modulus of 5.6 GPa, while the 48 hour-old concrete had a shear modulus of 16.5 GPa. Repeated tests showed similar end states, but some differences in hardening rate; these were attributed either to temperature variations or to differences in mould geometry. The technique worked equally well on mortar and concrete, indicating that the presence of the large aggregate particles in concrete does not adversely affect the results.

Text
__userfiles.soton.ac.uk_Users_spd_mydesktop_2004_Insight_NDT_Concrete.pdf - Version of Record
Restricted to Registered users only
Download (632kB)

More information

Published date: 1 June 2004
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 347819
URI: http://eprints.soton.ac.uk/id/eprint/347819
ISSN: 1354-2575
PURE UUID: 6a170005-cc47-427e-89dc-33213d655e67

Catalogue record

Date deposited: 30 Jan 2013 14:25
Last modified: 02 Dec 2019 20:53

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×