| Summary: | 碩士 === 國立臺灣科技大學 === 營建工程系 === 88 === The Influence of Mineral Admixture and Size Gradation of Aggregate on the Properties of Fresh Self-Compacting Concrete
Thesis Advisor : Ta-Peng Chang
Graduate Student : Chien-Liang Lin
ABSTRACT
The research uses computer program to do mixture proportioning design of self-compacting concrete (SCC). It has two principal research categories. One is to study the influence of eight kinds of weight ratio of fly ash to the slag powder on the properties of fresh self-compacting concrete under the fixed 0.35 m3 volume of paste and 0.155 m3 volume of powder. The other, under three kinds of the fixed volume of paste and powder, is to study the influence of four kinds of weight ratio of fly ash to the slag powder incorporating with three kinds of size gradation of coarse aggregate on the properties of fresh and hardened self-compacting concrete.
Research results show: (1）When the MSA (Max. size aggregate) bigger than 20 mm, the flowing property of concrete passing through a vacant space between the reinforcement will be relatively poor. Therefore, it is better to use MSA smaller than 20 mm in making the mixture proportioning design of SCC; (2) Among all the mixture proportioning designs of SCC used in the research under the condition of having more amount of coarse aggregate (Vg = 0.33 m3), the proportion with the weight ratio of fly ash to the slag powder of 6:4 has the best filling capacity; (3) Under different size gradations of coarse aggregate, the weight ratios of fly ash to slag powder of either 2:8 or 8:2, it will be much easier of make a better SCC; (4) The second size gradation of coarse aggregate (mixture of the 3/4” sieve and 3/8” sieve) can incorporate with more kinds of binding material having different weight ratios of fly ash to slag powder to successfully make the SCC; (5) At the age of 56days, the engineering property of hardened concrete with more slag powder presents a better developing rate of strength, elastic modulus, pulse speed, and electrical resistance, etc., than the concrete with more fly ash.
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