롤러전압 콘크리트포장의 적정 다짐실험 방안 고찰 = Optimum Compaction Test of Roller Compacted Concrete Pavement

다국어 초록 (Multilingual Abstract)

PURPOSES: To ensure appropriate RCC properties with sufficient strength development and workability, it is necessary to secure a proper level of consistency. It is also necessary to secure maximum dry density, which is an important factor for increasing the interaction of aggregate interlocking, leading to an augmentation of RCC strength. On the other hand, the dry density of RCC can be changed owing to the compaction conditions, water content, and particle size distribution. A Proctor test and a modified Proctor test were used for determining the optimum water content needed to achieve maximum dry density with different amounts of compaction energy. A Vebe test, on the other hand, was used for checking the level of consistency, which is important for producing a workable mixture.
METHODS : To confirm the degree of compaction at various particle sizes, RCC mixtures with different sand/aggregate ratios were evaluated. The Proctor test and modified Proctor test were applied to these mixtures to check the effect of the aggregate gradation and compaction energy on the maximum dry density and optimum water content. During each test, three specimens were produced for all types of water content under each aggregate gradation. A compaction curve and the optimum water content and maximum dry density for each aggregate gradation were then obtained for both tests. The range of water content for the appropriate consistency of each aggregate gradation was determined through a Vebe test. The optimum water content was then evaluated based on this range.
RESULTS : The compaction test results show that the modified Proctor test provides a higher maximum dry density and lower optimum water content compared with the standard Proctor test. For the modified Proctor test, two cases of aggregate gradation (s/a = 30% and 70%) had the optimum water contents outside of the appropriate water content range. For the standard Proctor test, on the other hand, none of aggregate gradations provided the optimum water content within the desired range.
CONCLUSIONS : The modified Proctor test should be used for an RCC mixture design because it can provide adequacy between maximum dry density and consistency. Moreover, the compaction roller has become highly developed for higher compaction energy.

참고문헌 (Reference)

1 Pittman, "The Effects of the construction process on selected fresh and hardened properties of Roller-Compacted Concrete(RCC) Pavement"

2 Watne S. Adaska, "Roller-compacted concrete (RCC)"

3 "Report on Roller Compacted Concrete pavements"

4 Antonio Nanni, "LABORATORY CONSOLIDATION METHODS APPLIED TO COMPACTED CONCRETE FOR PAVEMENTS"

5 Antomio Nanni, "LABORATORY CONSOLDATION METHODS APPLIED TO COMPACTED CONCRETE FOR PAVEMENTS, ASCE, and Nasser Meamarian"

6 Oh Byung Hwan, "Development of roller-compacted concrete pavement for construction of agricultural roads" Seoul National University 1997

7 Lim. Y. I., "Consistency and Mechanical Properties of Roller Compacted Concrete" University of ULSAN 2009

8 Farshid Vahedifard., "Assessing the effects of supplementary cementitious materials on the performance of low-cement roller compacted concrete pavement" 24 (24): 2528-2535, 2010

9 "ASTM C1170 Standard Test Method for Determining Consistency and Density of Roller-Compacted Concrete Using a Vibeating Table"

10 Lee, C. H., "A Study on the Development of Roller Compacted Concrete Pavement for bike roads" 13 (13): 103-114,