| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 89 === Study on Practicability Assessment of Controlled
Low Strength Materials with Construction Sludge
Thesis Advisor：Der-Hsien Shen
Graduate Student：Chi-Dong Chiu
ABSTRACT
This study is to investigate if construction sludge can be applied to the source of controlled low-strength materials (CLSM), to improve the quality of the trench backfilling and to improve environmental protection. The construction sludge is a mixture of clay and water. During the study, first of all, for the quality of CLSM control groups, we set the slump flow greater than 20 cm and the compressive strength of 28 days not more than 30kgf/cm2.Then,to make the control groups be the basic. Replacing the fine aggregate to clay groups by the clay with designed ratio. From the clay groups, choose some portions according to the fluidity and compressive strength to simulate construction sludge, and to conduct the mixture proportions. And then , perform the tests of slump flow, air content , unit weight , compressive strength , bending strength and settlement etc.
The results have shown；for clay groups, the clay content increase, and the slump flow and the air content decrease, compliant with upper limit of clay content of high fluidity,15% in middle-low aggregate content,10% in high aggregate content. The unit weight increase with clay content. The compressive strength of 28 days decrease with clay content increase in middle-low aggregate content. In high aggregate content, there is no obvious tendency, but the compressive strength is in 10~30 kgf/cm2.The tendency of the bending strength is similar to the compressive strength, but not more than 4 kgf/cm2,and the settlement no obvious variance. For construction sludge groups, comparing with clay groups in low fine aggregate content, the slump flow, unit weight , compressive strength and bending strength are higher, but air content is lower. In high aggregate content, the both values are close. To sum up, construction sludge applied to CLSM is feasible.
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