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Recent Advances in Marine Science and Technology, 2002

 事業名 海洋科学技術に関する太平洋会議の開催
 団体名 国際海洋科学技術協会 注目度注目度5


RESULT AND DISCUSSION
 
The degree of seaweed cover on the test plates is shown in Table 4. After three months, the surfaces of the test plates were covered in Bacillariophyceae, and arthropod adhesion was confirmed. The condition of the EPOC type plate after one month is shown in Figure 5. After five months, the adhesion of Colpomenia sinuosa was confirmed on porous concrete. After one year, the adhesion of Ecklonia cava, over 40 cm in length, was confirmed on the EPOC plates. The dominant species after one year was Ecldonia cava of the brown alga plant.
 
Figure 5. Condition of the test plate after one month (EPOC)
 
The degree of seaweed cover on the porous concrete was clearly higher than on normal concrete. The condition of seaweed adhesion on the EPOC plate is shown in Figure 6.
 
Figure 6. Condition of the test plate after one year (EPOC)
 
The population of Ecklonia cava on test plates is shown in Figure 7. After two years, the population increased. Also, the population cava on the EPOC plates was clearly higher than on other types.
 
Figure 7. Relationship between seaweed population and progress period
 
EPOC has the strength and voids which are necessary as a base for seaweed bed creation. Seaweed rapidly adheres to porous concrete. Seaweed adhesion to porous concrete was found to be greater than was the case with normal concrete. Because of the mixture of granulated fertilizer and converter slag, there tended to be a high degree of seaweed cover. It is concluded that porous concrete with fertilizer is effective as an adherent basis for algae.
 
CONCLUSION
 
The following conclusions have been reached.
 
1. Employing a special method for treating fertilizer, using a special polymer in the seal, a granulated fertilizer for porous concrete has been developed. It has been confirmed that by using this granulated fertilizer, the elution of the rapid fertilizer component from porous concrete can be prevented and fertilizer elution can be maintained.
 
2. A mixture with converter slag also becomes a source of elution for ferrous ion.
 
3. Seaweed rapidly adheres to porous concrete. Seaweed adhesion to porous concrete was found to be greater than with normal concrete.
 
4. Because of the mixture of granulated fertilizer and converter slag, there tended to be a high degree of seaweed cover and wet weight.
 
ACKNOWLEDGEMENTS
 
This work was sponsored by the Japan Science and Technology Corporation (JST). A part of the research was supported by a scientific grant No.09480137 of the Japanese Ministry of Education. The authors are pleased to acknowledge the considerable assistance of Dr. W. Kida (Institute of Environmental Geoscience CO., LTD) and Mr. Y. Onoda (Institute of Environmental Geoscience CO., LTD). The authors also wish to express their sincere appreciation to all the principals and engineers who assisted with the data collection for this study by taking the time to complete the survey.
 
REFERENCES
 
Hasegawa, H., H. Hirakuchi, Y. Terawaki and Y. Kawasaki. 1992. Structual design of artificial foundation for kelp bed. In JCI Proceedings of Civil Engineering in the Ocean, Vol.8,379-384. JAPAN
 
Tamai, M. and Y. Nishiwaki. 1992. Studies on marine epilithic organisms to no-fine concrete using slag cement and portland cement with silica fume. ACI Journals. SP-132-87, Vol.2:1621-1635.
 
Tamai, M., H. Mizuguchi. and T. Okamoto. 1997. Organism adaptable concrete. Journal of Global Environment Engineering. Vol.3:pp.65-75.







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