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Title |
Experimental Study on Engineering Properties of Concrete Using Fluosilicates Based Composite
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Authors |
양일승 ; 윤현도 ; 김도수 ; 길배수 ; 한승구 |
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Keywords |
규불화염계 복합 조성물 ; 불화규산 ; 투수성 ; 공극률 ; 수밀성 fluosilicates based composites ; fluosilicic acid ; permeability ; porosity ; watertightness |
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Abstract |
Fluosilicic acid(H2SiF6) is recovered as an aqueous solution which absorbs SiF₄ produced from the manufacturing of industrial-graded H₃PO₄ or HF. Generally, fluosilicates are the salts produced by the reaction of H2SiF6 and metal salts. Addition of fluosilicates to cement endows odd properties through unique chemical reaction with the fresh and hardened cement. This study was performed to know mechanical properties and watertightness using fluosilicates based composite made from fluosilicates and other compounds. Mix proportions for experiments were modulated at 0.45 of water to cement ratio and 0.0~2.0%of adding ratio of fluosilicates based composite. Evaluation for mechanical properties of concrete was conducted to know fresh state of concrete, hardening state of concrete, and watertightness. Evaluation for watertightness of concrete was carried out permeability, absorption test and porosity analysis. In addition. Scanning Electron Microscopy(SEM) and Energy Dispersive X-Ray(EDX) used for investigating micro-structure and atomic component distributed in hardened concrete. It is ascertained that characteristics of mechanical properties and watertightness was more improved than non-added because of packing role of fluosilicates based composite and pozzolanic reaction of soluble SiO₂. Also, concrete added fluosilicates based composite had a tendency to delay setting time and only 0.5% addition of fluosilicates based composite delayed 150 minutes compared with non-added.
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