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Title |
The Mechanical Properties of Concrete Using a Large Amount of Fly Ash for Replacement Method
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Keywords |
A large amount of fly ash ; Replacement method ; Water-fly ash ratio ; 다량 치환 플라이애쉬 ; 치환방법 ; 물-플라이애쉬 비 |
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Abstract |
This paper presents the results of an experimental investigation carried out to evaluate the mechanical properties of concrete mixtures in which fine(S) and coarse(G) aggregate was fully replaced with fly ash(FA). And flowability reduction problem in a large amount of fly ash concrete settled addition water(Wf) in concrete mixture. In the test, water-cement ratio(Wc/C) was 0.35, 0.45, and water-fly ash ratio(Wf/FA) was 0.35, 0.45. The fly ash replacement is two different method of P and Q. The P method is mix property that the fly ash and addition water(Wf) weight is equal to the aggregate weight [ FA + Wf = G (or S)]. The Q method is mix property that fly ash is equal to aggregate weight, and added addition water(Wf) [ FA + Wf ＞ G (or S)]. Test were performed for properties of fresh concrete and compressive strength were determined at 3, 7, 28 and 91 days. The result, compressive strength was improvement that Wc/C=0.35, Wf/FA=0.35 and fine aggregate replacement in P method series than others. The flowability at Q method was improvement result than P method, but compressive strength was not. Test results indicate significant improvement in the strength properties and flowability of plain concrete by the inclusion of fly ash as fully replacement of fine and coarse aggregate, and can be effectively the fly ash replacement method.
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