Investigation of the effect of aggregate replacement and steel fibre reinforcement on concrete slab track

Alizadeh, Ali (2016) Investigation of the effect of aggregate replacement and steel fibre reinforcement on concrete slab track. BEng dissertation, University of Portsmouth.

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    The increasing use of concrete in the rail industry, primarily through slab tracks, sleepers and station developments, highlights an opportunity to improve sustainability in this field of construction. As well as change to the methodology of a construction project, the materials that are used are becoming increasingly scrutinised in the pursuit of sustainable construction.
    This experiment focuses on the feasibility of introducing steel fibre, rubber and glass composite concrete for high fatigue applications in the rail industry. To determine this viability, 100x100x500mm beams were produced and subjected to four point cyclic flexural fatigue loading. The flexural strength and cycles to failure of each mix were compared with each other and then with reinforced concrete to establish benefits and alternative options.
    The results show the addition of steel fibre, rubber and cullet improves fatigue life of plain concrete. With this improvement, a slight decrease was observed in the flexural strength of samples with those that failed before the full 1,000 cycles of testing. Samples that completed the full range of cycles were found to have a significantly increased static flexural strength through densification.
    Ultimately the results of testing may be considered inconclusive due to the highly random nature of fatigue due to the heterogeneous nature of concrete, more so with the addition of steel fibre, rubber and glass.
    With the availability of this more sustainable concrete mix, it may assist beneficiaries such as Transport for London and Network Rail to improve the longevity of their assets, thereby reducing delays and disruptions to passengers over the life of a structure.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 06 Sep 2016 09:00
    Last Modified: 06 Sep 2016 09:00

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