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The use of silica fume as an admixture in cement-based material used in order to improve the properties of hydrated cement. Silica fume which is the micro particles <br /> <br /> <br /> <br /> <br /> that even submicron particles in the system will function as mic...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/16954 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The use of silica fume as an admixture in cement-based material used in order to improve the properties of hydrated cement. Silica fume which is the micro particles <br />
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that even submicron particles in the system will function as microfiller and reacts with calcium hydroxide to form CSH phase that provides mechanical properties of hydrated cement, this reaction is called the pozzolanic reaction. <br />
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This research was conducted to observe the effect of silica fume in mortar with composition of cement 40 w/o. The sample was made by varying the composition of silica fume-cement ratio of 0,16; 0,18; 0,20 water-cement ratio of 0,36; 0,39; 0,42; 0,45; 0.49 and air curing process for two weeks. Mechanical properties data obtained from compression test, and then to study the composition and structure were <br />
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characterized using XRD and SEM. <br />
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From the test result data, on mortar without silica fume was found that with increasing water-cement ratio 0,36-0.49 has lower the strength by 5,1 MPa. In mortar with silica fume addition, the results data obtained did not gives a significant effect on the improvement that is equal to 9,4 MPa is obtained at the water-cement ratio 0.,36 silica fume-cement ratio 0,18, and from this mixing, the highest strength obtain around 30 MPa. <br />
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The value obtained is below the expected high strength concrete. Presumably this is due to the agglomeration of silica fume that decreases the effectiveness of the addition of silica fume to increase the strength. Silica fume agglomeration was observed by SEM characterizations. Further investigation is needed to get a mortar or concrete with silica fume admixture to obtain an higher compressive strength. |
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