原文传递
Effect of recycled concrete aggregates on strength and stiffness gain of concrete and on bond strength of steel prestressing strand
| 题名： | Effect of recycled concrete aggregates on strength and stiffness gain of concrete and on bond strength of steel prestressing strand |
| 其他题名： | 1.Knaack,A.M.,and Y.C.Kurama.2013."Design of Normal Strength Concrete Mixtures with Recycled Concrete Aggregates."ACI Materials Journal 110(5):483-493. |
| 正文语种： | 英文 |
| 作者： | Michael R. Brandes |
| 关键词： | Recycled concrete aggregate;returned ready-mixed concrete;strand bond;strength gain;stiffness gain |
| 摘要： | This paper presents an experimental investigation on the use of recycled concrete aggregate (RCA) as a replacement for natural coarse aggregates (such as crushed limestone and gravel) in precast, prestressed concrete structures. Specifically, the paper investigates the effect of RCA on the bond strength between seven-wire steel prestressing strand and concrete and on the rate of concrete compressive strength and stiffness gain with time. Bond characteristics of strand samples were determined through ASTM A1081 pull-out tests using mortar. Then, ASTM A1081 was adapted to conduct pull-out tests of strand embedded in concrete with different types and amounts of RCA. In addition, the compressive strength and stiffness of RCA concrete compared with natural aggregate concrete were measured at 1, 3, 7, and 28 days. The RCA sources included rejected precast concrete, construction demolition concrete, and returned ready-mixed concrete. The use of RCA did not have a significant effect on the rate of concrete compressive strength or stiffness gain. Furthermore, RCA resulted in an effect (decrease or increase) in the strand bond strength that was consistent with the effect of RCA on the concrete compressive strength. Based on these findings, a predictive model was developed for the strand bond strength in RCA concrete. For the materials tested, RCA from precast concrete performed better than RCA from construction demolition concrete and returned ready-mixed concrete. |
| 出版年： | 2018 |
| 论文唯一标识： | J-30Y2018V63N02028 |
| 英文栏目名称： | Parking Structures |
| 期刊名称： | PCI-Prestressed Concrete Institute Journal |
| 拼音刊名(出版物代码)： | J-30 |
| 卷： | 63 |
| 期： | 02 |
| 页码： | 87-105 |
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