| Summary: | 碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 94 === The rice husk is a kind of low-priced fuel, low water content, after burning in high temperature it contains a large number of high-silicon, which can be make it Pozzolnic material, It not only save energy but also supply a useful recycling.
This study was done with rice husk ash （RHA） under 700℃ burning conditions and Siliceous ash as a partial cement replacement, in different percentages. The changes in property of RHA properties were investigated by XRD, DT-GTA and the technique of micro-analysis in order to understand the effect of activities. When RHA with 700℃ burning condition were added to cement paste or mortar, some properties such as workability, setting time, sulfate attack and strength tended to have some changes.
The test results show that RHA with partial cement replacements in different percentages the compatibility between the abundant SiO2 and cement as well as the high active silica content can consume the calcium hydroxide in cement paste and thus accelerate the hydration of cement and enhance strength. Thus, it was found that the optimum replacement percentages was 10%, at 28-days compressive strength reaches 867kg/cm2 ,bending strength reaches 65kg/cm2 , shrinkage ratio reaches between 0.13% - 0.17%, Every engineering property is all higher than cement paste and Siliceous ash paste. Observation of micro-structure RHA paste Produce in a large amount C-S-H gel of colloid structure packing hole the continuous causes the hydro mass to be compact promotion strength. The result proving Proper RHA with partial cement replacements can promotion engineering property.
|
|---|
