Quality Evaluation of Recycled Fine Aggregate Based on the Double-Control Concept of Water Demand Ratio and Strength Ratio

Abstract:

It’s necessary to establish criterion of recycled fine aggregate for the application of recycled concrete and recycled mortar. Strength ratio and water demand ratio are important technical indexes of recycled aggregate. In this paper, a series experiments are hereby performed to determine testing and classification method for recycled fine aggregate. The experimental results indicate that fineness modulus of recycled sand influences inversely the strength ratio and water demand ratio. Furthermore strength ratio of various aggregates decreases with the increasing of water demand ratio in using identical cement type. The present paper also provides definition and testing method of water demand ratio and strength ratio. Consequently the quality classification criterion for recycled aggregate is proposed based on the double-control concept of water demand ratio and strength ratio and has been adopted by national code “Recycled fine aggregate for concrete and mortar”(Revision for Approval).

• Periodical: Advanced Materials Research (Volumes 168-170)
• Pages: 742-745
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.168-170.742
• Online since: December 2010
• Authors: Song Gao, Qiu Yi Li, Qin Jiang Shang
• Keywords: Demand Ratio, Recycled Concrete (RC), Recycled Fine Aggregate, Strength Ratio

References

[1] QIN Yuan, WANG Jia-li, ZHENG Yu-chun, LI Qiu-yi. Research on Water Demand Ratio of Recycled Mortar as Technical Index for Recycled Fine Aggregate, Journal of Qingdao Technological University, 2009(4): 166-170. (In Chinese).

[2] GB/T14684-2001, Sand for building[s]. (In Chinese).

[3] LI Qiu-yi, Li Yun-xia, Jiang Yu-Dan. Influence of particle shaping on property of recycled fine aggregate. New Building Materials, 2006(1): 17-19. (In Chinese).

[4] Li Yun-xia, Li Qiu-yi, Zhao Tie-jun. Progress in Recycled Aggregate and Recycled Concrete. Journal of Qingdao Technological University, 2005, 26(5): 16-19. (In Chinese).

[5] Li qiu-yi, Li yun-xia. Jiang yu-dan, Research on the quality criterion and test method of recycled fine aggregate, journal of Qingdao technological university, 2005(6). 6-9. (In Chinese).