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Mechanical, thermal and acoustic properties of rubberised concrete incorporating nano silica
El-Khoja, Amal M.N.
El-Khoja, Amal M.N.
Publication Date
2019
End of Embargo
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The University of Bradford theses are licenced under a Creative Commons Licence.
Peer-Reviewed
Open Access status
Accepted for publication
Institution
University of Bradford
Department
Faculty of Engineering and Informatics
Awarded
2019
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Abstract
Very limited research studies have been conducted to examine the behaviour
of rubberised concrete (RuC) with nano silica (NS) and addressed the acoustic
benefits of rubberised concrete. The current research investigates the effect of
incorporating colloidal nano silica on the mechanical, thermal and acoustic
properties of Rubberised concrete and compares them with normal concrete
(NC).
Two sizes of rubber were used RA (0.5 – 1.5 mm) and RB (1.5 – 3 mm). Fine
aggregate was replaced with rubber at a ratio of 0%, 10%, 20% and 30% by
volume, and NS is used as partial cement replacement by 0%, 1.5% and 3%.
A constant water to cement ratio of 0.45 was used in all concrete mixes.
Various properties of rubberised concrete, including the density, water
absorption, the compressive strength, the flexural strength, splitting tensile
strength and the drying shrinkage of samples was studied as well as thermal and acoustic properties.
Experimental results of compressive strength obtained from this study together
with collected comprehensive database from different sources available in the
literature were compared to five existing models, namely Khatib and Bayomy- 99 model, Guneyisi-04 model, Khaloo-08 model, Youssf-16 model, and
Bompa-17 model. To assess the quality of predictive models, influence of
rubber content on the compressive strength is studied. An artificial neural
network (ANN) models were developed to predict compressive strength of
RuC using the same data used in the existing models. Three ANN sets namely
ANN1, ANN2 and ANN3 with different numbers of hidden layer neurons were
constructed. Comparison between the results given by the ANN2 model and
the results obtained by the five existing predicted models were presented. A
finite element approach is proposed for calculating the transmission loss of
concrete, the displacement in the solid phase and the pressure in the fluid
phase is investigated. The transmission loss of the 50mm concrete samples is
calculated via the COMSOL environment, the results from the simulation show
good agreement with the measured data.
The results showed that, using up to 20% of rubber as fine aggregate with the
addition of 3% NS can produce a higher compressive strength than the NC.
Experimental results of this research indicate that incorporating nano silica into
RuC mixes enhance sound absorption and thermal conductivity compared to
normal concrete (NC) and rubberised concrete without nano silica. This work
suggests that it is possible to design and manufacture concrete which can
provide an improvement to conventional concrete in terms of the attained
vibro-acoustic and thermal performance.
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Type
Thesis
Qualification name
PhD