Publication: Mechanical and transport properties of ultra high performance fibre green concrete as repair material under various curing regimes
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Date
2023-09-01
Authors
Mohd Helmi Bin Hassan
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Abstract
Existing concrete structures are frequently renovated and rehabilitated since older
ones are subject to harsh mechanical stress and environmental conditions. In order to
provide an effective technique to enhance the qualities of the existing structure, the
method and procedure of rehabilitation works are taken into consideration based on
the concerns indicated. The application of ultra-high performance fiber reinforced
cementitious composites (UHPFRC) as rehabilition or repair material nowaday show
an excellent feedback as it is high in mechanical and durability properties. Yet,
because a large amount of cement is needed to obtain an ultra-high mechanical
strength, this product is viewed as being uneconomical and less environmentally
friendly. As a solution, ultra-high performance fiber reinforced green concrete
(UHPFRGC) was developed. This concrete was made using pozzolanic ingredients,
ground granulated blast-furnace slag (GGBS) and ultra-fine palm oil fuel ash
(UPOFA), to replace 75% of the total volume of cement, making it an
environmentally friendly building material. UHPFRGC was used as the new repair
material under different curing regimes, including steam curing, boiling water curing,
and water curing, where the normal concrete substrate acted as an old concrete, in
order to investigate the interfacial bonding and fluid transport properties between the
old concrete and newly repair material. Interfacial bond strength characteristic were
evaluated. In addition, the fluid transport properties of repair material was also
assessed on the monolithic samples and the composite samples. For composite
samples, overlay layering condition was applied. The final results showed that UHPFRGC was successfully accepted as a repair material to reduce the fluid
transport values of old concrete. The bonding properties were also successfully
accepted with an excellent quality of bond strength. In comparison to boiling water
curing and water curing, steam curing produced the best outcomes in terms of
bonding characteristics and surface treatment.