| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 96 === The aim of this research is to investigate the effect on the slump
values, compressive strength and residual strength at enhanced
temperatures of recycled concrete with different water-to-cement
ratios and several percentages of replacing coarse aggregate with
construction tile wastes. After fracture test, ignition loss test is
adopted to determine the degree of hydration of cement paste of the
recycled concretes.
Experiment results showed that the slump values of recycled
concrete were increased when more recycled aggregates are used.
With water-to-cement ratio of 0.4, the concrete with 30%, 50%, 70%
recycled aggregates were of the order of 2% -11% below the control
concrete group (0% recycled aggregates) in compressive strength at
28 days. The recycled concretes had 15% and 40% reduction in
residual strength at 440℃ and 580℃ respectively. When approaching
the temperature of 800℃, the concrete with recycled coarse
aggregates had 75% reduction in residual strength. The test result
showed that the ignition loss and the degree of hydration of cement
paste were increased when more recycled aggregates are used.
Compared to control concrete group, recycled concretes had a 16-21%
and 11-20% increasing in ignition loss and degree of hydration
respectively.
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