| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 94 === The aim of this research is to investigate the possibility of the usage of recycle aggregates, together with the addition of nano-silicate balls. The mechanical properties, physical properties, chemical properties and thermal conductivity of the concrete are studies and compared with a series of experiments which include the lost of ignition and degree of hydration.
Experiment results show that, when more recycled aggregates are used, the compressive strength before and after subjected to a high temperature are decrease. The thermal conductivity, lost of ignition and degree of hydration will also decrease. When 100% recycled aggregates are used, the 28-day compressive strength of concrete is reduced by about 8.4% to 10.3%. The compressive strength after subjected to high temperature will reduce by 16.9% to 28.5%, thermal conductivity by 2.6% to 21.9%, lost of ignition by 5.88% to 7.05% and degree of hydration by 16.75% to 19.6%.
Besides, with the addition of nano-silicate balls, all the above-mentioned properties of the concrete are improved. This improvement reaches its peak when 0.5% of nano-silicate balls are added.
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