Recycled Concrete Aggregate for Medium-Quality Structural Concrete

This paper reports an evaluation of the properties of medium-quality concrete incorporating recycled coarse aggregate (RCA). Concrete specimens were prepared with various percentages of the RCA (25%, 50%, 75%, and 100%). The workability, mechanical properties, and durability in terms of abrasion of...

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Main Authors: Dong Viet Phuong Tran, Abbas Allawi, Amjad Albayati, Thi Nguyen Cao, Ayman El-Zohairy, Yen Thi Hai Nguyen
Format: Article
Language:English
Published: MDPI AG 2021-08-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/14/16/4612
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spelling doaj-5543502a95064d1ead2fbede5bb17fb82021-08-26T14:01:13ZengMDPI AGMaterials1996-19442021-08-01144612461210.3390/ma14164612Recycled Concrete Aggregate for Medium-Quality Structural ConcreteDong Viet Phuong Tran0Abbas Allawi1Amjad Albayati2Thi Nguyen Cao3Ayman El-Zohairy4Yen Thi Hai Nguyen5Department of Civil Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City 70000, VietnamDepartment of Civil Engineering, University of Baghdad, Baghdad 17001, IraqDepartment of Civil Engineering, University of Baghdad, Baghdad 17001, IraqFaculty of Civil Engineering, Tien Giang University, Mỹ Tho 84000, VietnamDepartment of Engineering and Technology, Texas A&M University-Commerce, Commerce, TX 75429, USADepartment of Civil Engineering, Industrial University of Ho Chi Minh City, Ho Chi Minh City 70000, VietnamThis paper reports an evaluation of the properties of medium-quality concrete incorporating recycled coarse aggregate (RCA). Concrete specimens were prepared with various percentages of the RCA (25%, 50%, 75%, and 100%). The workability, mechanical properties, and durability in terms of abrasion of cured concrete were examined at different ages. The results reveal insignificant differences between the recycled concrete (RC) and reference concrete in terms of the mechanical and durability-related measurements. Meanwhile, the workability of the RC reduced vastly since the replacement of the RCA reached 75% and 100%. The ultrasound pulse velocity (UPV) results greatly depend on the porosity of concrete and the RC exhibited higher porosity than that of the reference concrete, particularly at the transition zone between the RCA and the new paste. Therefore, the sound transmission in the RC required longer times than that in the reference concrete. Moreover, a predictive equation relating the compressive strength to the UPV was developed.https://www.mdpi.com/1996-1944/14/16/4612recycled coarse aggregaterecycled concreteworkabilityultrasound pulse velocitydurabilitywater absorption
collection DOAJ
language English
format Article
sources DOAJ
author Dong Viet Phuong Tran
Abbas Allawi
Amjad Albayati
Thi Nguyen Cao
Ayman El-Zohairy
Yen Thi Hai Nguyen
spellingShingle Dong Viet Phuong Tran
Abbas Allawi
Amjad Albayati
Thi Nguyen Cao
Ayman El-Zohairy
Yen Thi Hai Nguyen
Recycled Concrete Aggregate for Medium-Quality Structural Concrete
Materials
recycled coarse aggregate
recycled concrete
workability
ultrasound pulse velocity
durability
water absorption
author_facet Dong Viet Phuong Tran
Abbas Allawi
Amjad Albayati
Thi Nguyen Cao
Ayman El-Zohairy
Yen Thi Hai Nguyen
author_sort Dong Viet Phuong Tran
title Recycled Concrete Aggregate for Medium-Quality Structural Concrete
title_short Recycled Concrete Aggregate for Medium-Quality Structural Concrete
title_full Recycled Concrete Aggregate for Medium-Quality Structural Concrete
title_fullStr Recycled Concrete Aggregate for Medium-Quality Structural Concrete
title_full_unstemmed Recycled Concrete Aggregate for Medium-Quality Structural Concrete
title_sort recycled concrete aggregate for medium-quality structural concrete
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2021-08-01
description This paper reports an evaluation of the properties of medium-quality concrete incorporating recycled coarse aggregate (RCA). Concrete specimens were prepared with various percentages of the RCA (25%, 50%, 75%, and 100%). The workability, mechanical properties, and durability in terms of abrasion of cured concrete were examined at different ages. The results reveal insignificant differences between the recycled concrete (RC) and reference concrete in terms of the mechanical and durability-related measurements. Meanwhile, the workability of the RC reduced vastly since the replacement of the RCA reached 75% and 100%. The ultrasound pulse velocity (UPV) results greatly depend on the porosity of concrete and the RC exhibited higher porosity than that of the reference concrete, particularly at the transition zone between the RCA and the new paste. Therefore, the sound transmission in the RC required longer times than that in the reference concrete. Moreover, a predictive equation relating the compressive strength to the UPV was developed.
topic recycled coarse aggregate
recycled concrete
workability
ultrasound pulse velocity
durability
water absorption
url https://www.mdpi.com/1996-1944/14/16/4612
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