Long-Term Durability Performance of Green Concrete for the Marine Environment  

Oleh:

Lim, T.Y. Darren ; Teng, Susanto

Jenis: Article from Proceeding
Dalam koleksi: Proceeding The 1st International Conference on Sustainable Civil Engineering Structures and Construction Materials (SCESCM) di Yogyakarta, September 11 – 13, 2012, page 247-253.
Topik: Green Concrete; Durability; Marine Environment; Ultra Fine Slag; Silica Fume
Fulltext: 34.pdf (548.41KB)

Isi artikel

This paper describes part of current research efforts at Nanyang Technological University, Singapore, to produce sustainable and ultra durable concrete for civil engineering infrastructure in general and for marine (underwater) infrastructure, specifically. Singapore has placed special emphasis on the use of green concrete in new concrete structures in an effort to achieve some degree of sustainability in the construction industry. Thus the use of recycled materials such as recycled aggregates, or cement replacement materials such as Ground Granulated Blast-furnace Slag (GGBS) is very common. The use of GGBS will not only contribute to sustainability issue but it will also lead to a very durable concrete. Different percentages of GGBS and Ultra-Fine Ground Granulated Blast-furnace Slag (UFGGBS), as well as silica fume were used as cement replacement materials. The use of slag cement (with either or both GGBS and UFGGBS) will improve durability significantly. However, the normal GGBS will lead to a lower rate of strength development compared to Ordinary Portland Cement (OPC) while UFGGBS contributes positively to the early strength and ultimate strength developments. The use of silica fume improves durability further. Several concrete mixes with various percentages of UFGGBS and normal GGBS as well as silica fume were investigated in order to produce Ultra Durable Concrete that would be suitable for large marine structures. The aim is to increase the life span of the concrete structures to about 500 years. Thus, the performance of the concrete when subjected to chloride environment was investigated by using several methods, such as Rapid Chloride Migration Test, Electrical Resistivity Method, and others. The chloride diffusion coefficients would then be used further to predict the failure probability of the concrete structure at certain age. The cost of concrete is a serious financial concern, so normal aggregate of 20 mm maximum diameter was used and the total amount of cementitious materials was limited to 580 kg/m3. The achieved compressive strength of the concrete with UFGGBS could reach 135 MPa and its performance in terms of durability is much more superior when compared to concrete with OPC only. It can also be shown that achieving a structural life span of 500 years in the marine environment looks possible, at least theoretically.

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