Next Article in Journal
Ultrafast Mid-IR Laser Pulses Generation via Chirp Manipulated Optical Parametric Amplification
Next Article in Special Issue
Residual Axial Bearing Capacity of Concrete-Filled Circular Steel Tubular Columns (CFCSTCs) after Transverse Impact
Previous Article in Journal
Cognitive Assistants—An Analysis and Future Trends Based on Speculative Default Reasoning
Previous Article in Special Issue
Evaluation of Fe-Based Shape Memory Alloy (Fe-SMA) as Strengthening Material for Reinforced Concrete Structures
Article Menu
Issue 5 (May) cover image

Export Article

Open AccessArticle
Appl. Sci. 2018, 8(5), 743; https://doi.org/10.3390/app8050743

Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

1
State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China
2
College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
*
Author to whom correspondence should be addressed.
Received: 20 March 2018 / Revised: 30 April 2018 / Accepted: 3 May 2018 / Published: 8 May 2018
(This article belongs to the Special Issue Emerging Construction Materials and Sustainable Infrastructure)
View Full-Text   |   Download PDF [5125 KB, uploaded 8 May 2018]   |  

Abstract

Directly adopting coarsely crushed demolished concrete lumps (DCLs) with pouring concrete (referred to as fresh concrete, FC) in new structural members has been demonstrated to be more efficient and environmental than the traditional approach of recycling waste concrete as coarse aggregate particles. In this study, 45 prisms made of FC and DCLs were tested under axial compressive loading up to failure. The varied parameters included the dimensions of the prisms, the replacement ratio of DCLs, and the characteristic size of the lumps. The compressive performance of 36 cubes and cylinders was also experimentally examined for comparison. A formula was developed to predict the strength of compound concrete prisms filled with DCLs. Empirical formulas were also established relating a prism’s strength with its elastic modulus and peak strain. It was found that: (a) when the replacement ratio is between 20% and 40%, the strength of a prism is about 1.13 that of a cylinder, due to the casting direction of the prism being different from that of the cylinder; (b) as the size of filler lumps increases relative to the size of the specimen, the strength of prisms decreases faster than that of cylinders, which weaken faster than cubes; and (c) due to the coupling effect of the aggregate size of FC and the specimen size, the compressive strength of prisms first increases with their size and then declines gradually. View Full-Text
Keywords: demolished concrete lumps; fresh concrete; prisms; compressive behaviors; size effects; shape effects demolished concrete lumps; fresh concrete; prisms; compressive behaviors; size effects; shape effects
Figures

Figure 1

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Wu, B.; Yu, Y.; Chen, Z. Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete. Appl. Sci. 2018, 8, 743.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top