Development of ultra high performance fiber reinforced concrete.
Loading...
URL
Journal Title
Journal ISSN
Volume Title
Insinööritieteiden korkeakoulu |
Master's thesis
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.
Authors
Date
2018-03-19
Department
Major/Subject
Master's Programme in Building Technology.
Mcode
ENG27
Degree programme
Master’s Programme in Building Technology (CIV)
Language
en
Pages
72+24
Series
Abstract
The usage of ultra-high strength concrete with high compressive and flexural strength has been significantly increasing in modern day construction. The use of locally available materials for producing Ultra High Performance Fiber Reinforced Concrete (UHPFRC) can significantly reduce the cost gap that is one of the main obstacles to the production of such concrete. This research study aims at the development of UHPFRC using locally available materials in Finland, characterized by high compressive and flexural strength properties. The study is focused on producing both white and grey UHPFRC. The research includes the use of locally manufactured cement, quartz and limestone fillers, silica fume and superplasticizers. Water demand tests by Puntke method were carried out to optimize the filler content and type. A large series of preliminary tests were carried out to evaluate the effect of different mixture proportions and material contents on the flow and compression properties of Ultra High Performance Concrete (UHPC). The fresh and hardened properties of the UHPC and UHPFRC were studied such as flowability of the mix, compression and flexure strength. Compressive strength of 148 MPa with grey UHPFRC and 155.5 MPa with white UHPFRC were achieved using standard curing conditions. Significantly high flexural strength value of 29 MPa was achieved with grey UHPFRC. It was observed that the addition of fibers have a significant effect on the compression strength of white UHPFRC and flexure properties of grey and white UHPFRC. The flowability of the mixture was slightly reduced by the addition of fibers but was still capable of producing self-compacting UHPFRC. The specimens were cured under standard conditions. The optimum dosage of silica fume was found out to be 20 % by cement weight. Pika cement was found out to be the best cement for production of grey UHPFRC. Results obtained shows that it is possible to produce both white and grey UHPFRC under standard curing conditions by carefully selecting the local materials available and proportioning them in the right amount.Description
Supervisor
Punkki, JouniThesis advisor
Punkki, JouniKeywords
Ultra high performance fiber reinforced concrete (UHPFRC), compressive strength, flexural strength, self-compacting concrete