| Summary: | 碩士 === 國立交通大學 === 土木工程研究所 === 83 === The thesis investigates the compressive strength of hardened
paste and mortar specimens mixed with cement and class F Fly
Ash ( a product of Hsin-Ta Thermal Power Plant of Taiwan Power
Company ) . The specimens are prepared under various dry-mix
compaction pressure . These specimens were hardened inside
autoclave through different duration and high temperature steam
catalytic process.These paste specimens was analyzed with ther-
mogravimetry ,nuclear magnetic resonance,and scanning electron
microscope to verify its hydration mechanisms and pozzolanic
reaction. Based on experimental results , it is concluded that
maximum compressive strength was obtained when dry-mix
compaction pre- ssure was around 4 kg/cm~^2~z , and catalytic
temperature was 180℃.In the early stage of catalysis,more fly
ash cement used with lower degree of hydration would result in
lower amount of CH and weaker strength . As duration of
catalysis increased , both degree of hydration and amount of CH
would decrease. However,after 12 hours the amount of CH would
decrease, due to pozzolanic reaction compressive strength of
the specimens would increase.After 30 hours,the strength of
specimens with 40 % fly ash was greater than the strength of
specimens without fly ash. Dry-mix pure fly ash specimens
showed no strength at all.
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