Early-age strength measurement of shotcrete

Mohajerani, A, Rodrigues, D, Ricciuti, C and Wilson, C 2015, 'Early-age strength measurement of shotcrete', Journal of Materials, vol. 2015, 470160, pp. 1-10.


Document type: Journal Article
Collection: Journal Articles

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Title Early-age strength measurement of shotcrete
Author(s) Mohajerani, A
Rodrigues, D
Ricciuti, C
Wilson, C
Year 2015
Journal name Journal of Materials
Volume number 2015
Article Number 470160
Start page 1
End page 10
Total pages 10
Publisher Hindawi
Abstract Shotcrete or sprayed concrete is a special concrete designed for spraying onto a surface, as a construction material. With shotcrete application as a ground support system ever-present in both mining and tunnelling sectors, a major requirement of drive progression is to determine when it is safe to re-enter beneath freshly sprayed concrete. Accurately determining this time is of paramount importance. Generally, this re-entry time is based on measuring the developing strength of shotcrete until an adequate strength value is reached. The issue with current practice is that there is no widely accepted or generally preferred method that accurately assesses the shotcrete lining's true early-age strength. However, there are a number of strength tests that are commercially available and used in the industry, these include the soil penetrometer, needle penetrometer, bolt screws, beam end testers and drilled core samples. This paper researches into these testing methods and their characteristics in order to determine their accuracy, testing ranges and suitability for in situ use in the tunnelling and mining industry. The paper then looks into what advancements or developments in testing technology would be of benefit to the underground industries. The investigation ultimately reveals that current methods all have substantial shortcomings. Based on these findings, recommendations are proposed for the applicable use of the current testing methods and recommendations for future improvements.
Subject Construction Materials
Keyword(s) Shotcrete
Concrete
Early Age Strength
Shotcrete Testing
Tunnelling
Mining
DOI - identifier 10.1155/2015/470160
Copyright notice © 2015 Abbas Mohajerani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
ISSN 2314-4866
Additional Notes Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 Unported License.
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