ORCID Profile
0000-0002-4699-9919
Current Organisations
University of Technology Sydney
,
University of New South Wales
,
Macquarie Geotech
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Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 07-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2020
Publisher: Elsevier BV
Date: 03-2017
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2021
Publisher: Elsevier BV
Date: 07-2016
DOI: 10.1016/J.ULTRAS.2016.04.006
Abstract: Investigation was carried out to study the effects of maximum aggregate size (MAS) (12.5mm, 19.0mm, 25.0mm, 37.5mm, and 50.0mm) on ultrasonic pulse velocity (UPV) of concrete. For investigation, first class bricks were collected and broken to make coarse aggregate. The aggregates were tested for specific gravity, absorption capacity, unit weight, and abrasion resistance. Cylindrical concrete specimens were made with different sand to aggregate volume ratio (s/a) (0.40 and 0.45), W/C ratio (0.45, 0.50, and 0.55), and cement content (375kg/m(3) and 400kg/m(3)). The specimens were tested for compressive strength and Young's modulus. UPV through wet specimen was measured using Portable Ultrasonic Non-destructive Digital Indicating Tester (PUNDIT). Results indicate that the pulse velocity through concrete increases with an increase in MAS. Relationships between UPV and compressive strength and UPV and Young's modulus of concrete are proposed for different maximum sizes of brick aggregate.
Publisher: Elsevier BV
Date: 07-2004
Publisher: Elsevier BV
Date: 07-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier
Date: 2022
Publisher: Elsevier BV
Date: 11-2020
Publisher: Springer Science and Business Media LLC
Date: 12-2021
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 29-06-2022
DOI: 10.1617/S11527-022-01989-7
Abstract: With the potential for a decline in fly ash (FA) production over time, due to the phasing down of coal fired power plants, alternative supplementary cementitious materials need to be identified. The efficiency of pulverised glass powder (PGP) was studied for its reactivity and its capacity for inhibiting alkali-silica reaction (ASR) that results from utilisation of recycled glass as a fine aggregate (sand) replacement. Characterisations of pastes containing PGP reveal that PGP may possess latent hydraulic properties, resulting in a more than 75% strength activity index, together with better strength gain than FA-blended pastes. PGP also offered increased heat of hydration compared to FA, from a combination of the dilution effect, filler effect and early-age reactions of PGP. A comparable efficiency of PGP and FA in ASR expansion mitigation was confirmed with mortar bar expansions of less than 0.10% at cement replacement levels of at least 10%. Both PGP and FA provided alkali dilution and reduced the mass transport in hydrated cement paste from the refinement of larger pores to below 60 nm. The FA mix consumed calcium hydroxide and, thus, performed marginally better than the PGP mix in mitigating ASR. This pozzolanic reactivity is not evident for PGP, whereas in the literature glass powders are often regarded as pozzolanic. Microscopic images confirm that PGP and FA significantly limit the occurrence of ASR gels without altering its composition. It was concluded that PGP is a comparable ASR inhibitor to FA, despite the underlying differences in their mechanisms. The result of this research support the utilisation of recycled glass both as an aggregate, and as an ASR-inhibiting SCM in cementitious systems.
Publisher: UNSWorks, UNSW
Date: 2022
DOI: 10.26190/03MA-4P24
Publisher: Elsevier BV
Date: 07-2022
Publisher: MDPI AG
Date: 29-09-2023
Publisher: Elsevier BV
Date: 03-2022
Publisher: Informa UK Limited
Date: 17-03-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2021
Publisher: UNSWorks, UNSW
Date: 2021
DOI: 10.26190/3JM3-K405
No related grants have been discovered for Aziz Mahmood.