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The effects of pumping on the air content and void structure of air-entrained, wet mix fibre reinforced shotcrete

Case Studies in Construction Materials, 2019-12, Vol.11, p.e00288, Article e00288 [Peer Reviewed Journal]

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Title:
The effects of pumping on the air content and void structure of air-entrained, wet mix fibre reinforced shotcrete
Author: Talukdar, S. ; Heere, R.
Subjects: Air content ; Air voids ; Durability ; Freeze thaw ; Pumping ; Shotcrete ; Slump ; Spacing factor
Is Part Of: Case Studies in Construction Materials, 2019-12, Vol.11, p.e00288, Article e00288
Description: The air content and void structure of hardened shotcrete is essential for its durability and resistance against freeze thaw damage. However, producing a mix which is pumpable, shootable, and also meets durability requirements is not always easy. The situation is further complicated when adding fibres to the mix. This paper presents some observations concerning air content and air void systems of fresh and hardened fibre reinforced shotcrete mixes used for a ground support project in Western Canada. The most critical findings were that altering the time the mix spends in the line and presumably while under pressure may affect the overall air content and the air void structure of the hardened material, and that the pumping process itself has an adverse effect on the total air content and spacing factor in the hardened material.
Publisher: Elsevier Ltd
Language: English
Identifier: ISSN: 2214-5095
DOI: 10.1016/j.cscm.2019.e00288
Source: ROAD: Directory of Open Access Scholarly Resources
DOAJ Directory of Open Access Journals

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