| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 81 === This paper wasmainly to inspect the mechanical property and
behavior of cement paste and mortar with fly ash,Taking the
basic parameters, such as different fly ash content, sand
content ratio water-to-cement ratio, curing temperature and
curing age. Test results indicated that in mechanical
properties higher sand containing ratio would increase the
sufacial contact of standard sand and hence to result in the
increase of surfacial contact of standard sand. As a result,
paste content would be short of wrapping standard sand and
filling pores. Therefore, before the ninetieth day, strength of
fly-ash cement mortar would decrease with the increase of sand
content. In mechanical behavior,the higher the water-to-cement
ratio and sand content, the greater the axial strain of fly-
ash cement paste and cement mortar, and the lower the
destructive strain energy, but the greater the extension. With
the shorter curing age, the slope of the stress-strain curve
would be plainer, and the failure model belonged to ductility
failure.With the fixed water-to-cement ratio, the axial strain
was tend to decrease with the rising up of curing temperature.
Simultaneously, slope of stress-strain curve would become
steeper, elastic modulus would be greater, and the failure
model would be brittleness failure.
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