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Testing and Prediction of the Strength Development of Recycled-Aggregate Concrete with Large Particle Natural Aggregate

1,2,*, 1,2, 1,2, 1,2 and 2,3,*
1
School of Civil Engineering and Communications, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
2
International Joint Research Lab for Eco-building Materials and Engineering of Henan, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
3
Henan Provincial Collaborative Innovation Center for Water Resources High-efficient Utilization and Support Engineering, Zhengzhou 450046, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 1891; https://doi.org/10.3390/ma12121891
Received: 14 May 2019 / Revised: 7 June 2019 / Accepted: 11 June 2019 / Published: 12 June 2019
(This article belongs to the Special Issue Concrete and Construction Materials)
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Abstract

In this paper, a new recycled aggregate concrete (RAC) was produced with composite coarse aggregate and fine recycled aggregate. The composite coarse aggregate was mixed into continuous gradation by large particle natural aggregate with small particle recycled aggregate. To explore the time-dependent developments of the compressive strength and splitting tensile strength of this new RAC, 320 groups of cubic specimens were tested at different curing ages from 3 days to 360 days to measure the compressive and splitting tensile strengths. The amount of large particle natural aggregate varied from zero to 70% in mass of the total coarse aggregate. The water/cement ratio was taken as 0.60, 0.49, 0.41 and 0.36 to represent four strength grades of the RAC at about C20, C30, C40 and C50. Based on the tested results, the curves of the compressive and tensile strengths of the RAC that changed with curing age are plotted, which clearly exhibit that the amount of large particle natural aggregate had a rational range in different strength grades of the RAC which had better aging strength. When the RAC was no larger than C30 with a water/cement ratio of 0.60 and 0.49, the amount of large particle natural aggregate should be no more than 30%; when the RAC was no less than C40 with a water/cement ratio of 0.41 and 0.36, the amount of large particle natural aggregate should be no less than 50%. Along with the general prediction of the strength development of all the tested RAC, the optimal predictive formulas are proposed for the strength development of RAC with a rational amount of natural aggregate. Meanwhile, the strength developments of RAC with a rational amount of natural aggregate are assessed by the time-dependent models proposed by the ACI Committee 209 and CEB-FIP MC 2010. View Full-Text
Keywords: recycled aggregate concrete (RAC); large particle natural aggregate; small particle recycled aggregate; fine recycled aggregate; compressive strength; splitting tensile strength; development prediction recycled aggregate concrete (RAC); large particle natural aggregate; small particle recycled aggregate; fine recycled aggregate; compressive strength; splitting tensile strength; development prediction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, C.; Wang, F.; Deng, X.; Li, Y.; Zhao, S. Testing and Prediction of the Strength Development of Recycled-Aggregate Concrete with Large Particle Natural Aggregate. Materials 2019, 12, 1891.

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