| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 96 === Reservoir sludge and wood dusts were first used to produce ultra-light hollow sphere aggregates. Further, the ultra-light hollow sphere aggregates were compactly packed and then bonded partially by a high-strength inorganic material to form a no-fines concrete. The engineering properties of the on-fines concrete including unit weight, strength and coefficient of thermal conductivity were affected by the ratio of aggregate to cement, the ratio of water to cement, the size of hollow sphere aggregate and the manufacturing method we used such as casting and high-pressure compaction. Experimental results on the no-fines concretes made by casting suggest that super-lightweight no-fines concretes are promising and can be used as thermal insulation in building construction. Under the requirement of compressive strength larger than 0.5 MPa, the engineering properties of no-fines concretes depend on the size of hollow sphere aggregates used. The lightest unit weight, compressive strength and coefficient of thermal conductivity of the no-fines concretes with an aggregate size of 8mm are 491kg/m3, 0.52MPa and 0.18W/m•K, respectively. At the same time, the lightest unit weight 377kg/m3, the compressive strength 0.51MPa and the coefficient of thermal conductivity 0.15 W/m•K are found when the aggregate size is 11mm while the lightest unit weight 304kg/m3, the compressive strength 0.68MPa and the coefficient of thermal conductivity 0.15 W/m•K are obtained when the aggregate size is 15mm. In addition, the lightest unit weight is 640 kg/m3 and the highest compressive strength is 6.92MPa when no-fines concretes are made by high-pressure compaction under the requirement of compressive strength larger than 3MPa.
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