Other - Civil and Trade
https://research.thea.ie/handle/20.500.12065/2480
2024-03-28T12:46:11ZOat husk ashes as supplementary cementitious material
https://research.thea.ie/handle/20.500.12065/3939
Oat husk ashes as supplementary cementitious material
Bonifacio, Alysson Larsen; Archbold, Paul
Supplementary cementitious materials (SCMs) are recognized and utilized to minimize cement use; however, several waste sources now employed for partial cement replacement are under threat for changes in industrial production methods and local availability. As a result, alternative materials like agricultural residues are being investigated as SCMs, particularly for their pozzolanic potential as a source of amorphous silica. In this work, the pozzolanic potential of oat husk ashes is investigated.
2022-01-01T00:00:00ZSuitability of selected natural fibres for concrete performance improvement.
https://research.thea.ie/handle/20.500.12065/3315
Suitability of selected natural fibres for concrete performance improvement.
da Costa, Ana Caroline; Archbold, Paul
The addition of fibres to reinforce concrete (FRC) is required when concrete structures may be submitted to other types of stresses beyond
the compressive. Post-crack tensile strength, resistance to abrasion and additional plastic deformation are examples of additional physical
and mechanical properties that can be required from concrete elements. Steel, glass and polymer fibres are the most common concrete
fibres at present. However, their high cost and low durability under abrasive conditions, along with their environmental impact are
disadvantages associated with these materials[1-3]. This work examines the potential replacement of these synthetic fibres with more sustainable natural fibres.
2020-01-01T00:00:00ZTransient response simulation of a composite material footbridge to crossing pedestrians.
https://research.thea.ie/handle/20.500.12065/3176
Transient response simulation of a composite material footbridge to crossing pedestrians.
Fanning, P.J.; Archbold, Paul; Pavic, A.; Reynolds, P.
Loads applied by pedestrians, and crowds of pedestrians, are particularly important for footbridges with natural frequencies close to footfall frequencies of moving pedestrians. Recorded response data from Aberfeldy Bridge, an advanced composite material footbridge in Scotland, for numerous pedestrian crossings reveal both vertical and lateral response components. No provision is made in existing codes of practice for the calculations of actual dynamic responses in pedestrian footbridges to lateral pedestrian-induced load. The authors are seeking to develop an appropriate pacing frequency-dependent lateral load model, to be used in conjunction with existing vertical loads models that wold account for such lateral excitation. This is done by correlation of the measured bridge dynamic response with the results of the simulations where a validated numerical model has been utilised. The modelling techniques used to correlate the modal properties of the finite element model with the real structure are described in this paper, Subsequently the modelling and transient solution strategies used to simulate the vertical footbridge response at different pacing frequencies are compared to actual bridge measurements to good effect,. Finally a structure for the form of the lateral load model required to capture pacing frequencey dependent lateral effects is also proposed.
2003-01-01T00:00:00ZPreliminary characterisation of natural fibres for enhancement of concrete
https://research.thea.ie/handle/20.500.12065/2932
Preliminary characterisation of natural fibres for enhancement of concrete
da Costa Santos, Ana Caroline; Archbold, Paul
Reinforced concrete with steel is one of the most used construction materials in the world. The addition of short bio-based fibres into the concrete mixture for the production of elements lightly loaded can avoid concrete cracking while reducing risks, time of production, costs with reinforcing bars and also, the steel mill pollution. There has been limited exploration to date of the potential use of natural fibres for the enhancement of concrete and this paper presents a literature review about potential vegetable fibres to be considered for this purpose.
2018-04-24T00:00:00Z