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http://dx.doi.org/10.11112/jksmi.2012.16.2.058

Mixture Study for Early-age Strength Improvement of NAC-typed High-strength Concrete Piles  

Yi, Seong Tae (인하공업전문대학 토목환경과)
Noh, Jae Ho ((주)제이엔티아이엔씨)
Heo, Hyung Seok ((주)제이엔티아이엔씨)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.16, no.2, 2012 , pp. 58-64 More about this Journal
Abstract
Due to the influence of global oil prices, industrial productivity, which oil consumption is high, was significantly reduced. AC type of high-strength PHC piles is being manufactured through twice the steam curing process and this have resulted in a significant rise for product's manufacturing costs. NAC way other types of file manufacturing process has the advantage of reducing manufacturing costs by a turn of the steam curing. Nevertheless, because the initial strength be poor than that of AC method, shipment is being after the curing period of approximately three days. In addition, the growth of the product enhance with curing period can not be avoided, as a result, cost of inventory is acting as the rise. Piles by the AC method is immediately shipped after curing, damaging problems does not occur when they are introduced to the field site (for example, pile on-site). In the case of NAC, however, at least after the curing period of three days and after expressing the strength of 80 MPa or more, they are shipped on the scene. Therefore, NAC type has problems as follows: (1) increase in moderate inventory holding costs with type and (2) breakage in the field due to lack of strength. In this study, for NAC-typed PHC files, mixing characteristics research for the strength development at 1 day equivalent to AC method were conducted and strength characteristics with changes of original materials were evaluated were also identified.
Keywords
NAC-type; High-strength Concrete Piles; Early-age; Strength Improvement; Mixture Characteristics;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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