Microbial-induced carbonate Precipitation for Strength Improvement in Mortar
| Autor: | Yu-Xuan Hung, 洪于軒 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 The addition of Pozzolan material is a common way to improve concrete’s weak interface between aggregate and cement. In this study, Microbial-induced carbonate precipitation technology is applied to cement materials and improve the weak interface of concrete. The tests of this study design the different water-cement ratio 0.4, 0.5, and 0.6, varying concentration of Bacillus pasteurii, calcium, and nutrient and changing the curing mode to make mortar cubes. Supposed to explore what the effect of Microbial-induced carbonate precipitation on the compressive strength of cement mortar. The results show the lower the water-cement ratio, the better the effect of Microbial-induced carbonate precipitation on compressive strength. Under the same water-cement ratio, 15% maximal compressive strength increased in the higher microbial concentration tests. Adding calcium increases the amount of calcium in the mortar and further increases the compressive strength at early age, but the calcium carbonate particles at certain percentage in the mixed water will reduce the compressive strength. Compared with normal curing, cycle curing can enhance Microbial-induced carbonate precipitation. However, the normal one continuously maintaining the hydration reaction and supplying of urea is better for the development of the compressive strength. Nutrient contains polysaccharides, which will inhibit the hydration effect if added too much to the cement mortar. It is therefore not conducive to the development of compressive strength at early age. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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