A novel mix design methodology for Recycled Aggregate Concrete

2016 ◽  
Vol 122 ◽  
pp. 362-372 ◽  
Author(s):  
Marco Pepe ◽  
Romildo Dias Toledo Filho ◽  
Eduardus A.B. Koenders ◽  
Enzo Martinelli
Keyword(s):  
Design Methodology ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mix Design ◽  
Aggregate Concrete

Evaluation of conventional and equivalent mortar volume mix design methods for recycled aggregate concrete

2020 ◽  
Vol 53 (1) ◽  
Author(s):  
Emmanuel E. Anike ◽  
Messaoud Saidani ◽  
Eshmaiel Ganjian ◽  
Mark Tyrer ◽  
Adegoke O. Olubanwo
Keyword(s):  
Design Methods ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mix Design ◽  
Aggregate Concrete

scholarly journals The Simple Mix Design Method and Confined Behavior Analysis for Recycled Aggregate Concrete

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3533
Author(s):  
Chong Rong ◽  
Jing Ma ◽  
Qingxuan Shi ◽  
Qiuwei Wang
Keyword(s):  
Design Method ◽  
Steel Tube ◽  
Recycled Aggregate Concrete ◽  
Confined Concrete ◽  
Recycled Aggregate ◽  
Mix Design ◽  
Aggregate Concrete ◽  
Confining Effect ◽  
Study Results ◽  
The Common

For the environment protection and sustainable development in building construction, waste concrete can be processed into recycled aggregate to mix the recycled aggregate concrete (RAC). However, the existing mix design methods of RAC were complex, and the mechanical properties of RAC were more weakened than ordinary concrete. This paper presents a simple mix design method for RAC, including orthogonal test and single-factor test. Then, in order to study the behavior of confined RAC, this paper presents a comprehensive experimental study on the RAC filled in steel tube (RCFST) specimens and the RAC filled in GFRP tube (RCFST) specimens. The results show that the proposed mix design method can mix different stable strength grades of RAC promptly and efficiently. In addition, the steel tube and GFRP tube can provide a well confining effect on core RAC to improve the mechanical behavior of column. Moreover, the properties of core RAC in steel tube are the same as the common passive confined concrete, and the properties of core RAC in the GFRP tube are the same as the common active confined concrete. The study results can provide reference for other kinds of RAC mixtures as well as be a foundation for theoretical studies on confined RAC.

The potency of recycled aggregate in new concrete: a review

2019 ◽  
Vol 19 (4) ◽  
pp. 594-613 ◽  
Author(s):  
Emmanuel Ejiofor Anike ◽  
Messaoud Saidani ◽  
Eshmaiel Ganjian ◽  
Mark Tyrer ◽  
Adegoke Omotayo Olubanwo
Keyword(s):  
Research Work ◽  
Recycled Aggregate Concrete ◽  
Construction And Demolition Waste ◽  
Recycled Aggregate ◽  
Mix Design ◽  
Recycled Aggregates ◽  
Demolition Waste ◽  
Aggregate Concrete ◽  
Content Type ◽  
Natural Aggregate

Purpose This paper aims to review the effect of using recycled aggregates (RA) on the properties of recycled aggregate concrete (RAC) following the steady rise in global demand for concrete and the large generation of construction and demolition waste. Design/methodology/approach This study reviewed relevant literature of research work carried out by previous researchers, leading to a deeper understanding of the properties of both RA and RAC. The properties of RA and RAC reported in the various studies were then compared to their corresponding natural aggregate (NA) and natural aggregate concrete, as well as the specifications provided in different codes of practice. In addition, the mix design methods appropriate to RAC and the cost implication of using RA were reviewed. Findings Findings show that the contribution of RA to strength appears inferior in comparison to NA. The shortcoming is attributed to the mortar attached to the RA, which raises its water absorption capacity and lowers its density relative to those of NA. However, it has been reported that the use of regulated quantity of RA, new mixing and proportioning methods, the addition of admixtures and strengthening materials such as steel fibres, can improve both mechanical and durability properties of RAC. Cost evaluation also showed that some savings can be realized by using RA instead of NA. Originality/value This research serves as a guide for future works and suggests that the use of RA as aggregate in new concrete is technically possible, depending on the mix design method adopted.

scholarly journals Mix Design for Pervious Recycled Aggregate Concrete

2012 ◽  
Vol 6 (4) ◽  
pp. 239-246 ◽  
Author(s):  
Rasiah Sriravindrarajah ◽  
Neo Derek Huai Wang ◽  
Lai Jian Wen Ervin
Keyword(s):  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mix Design ◽  
Aggregate Concrete

A Study on the GA-Based Design for Recycled Aggregate Concrete

2013 ◽  
Vol 284-287 ◽  
pp. 1225-1229
Author(s):  
Won Jun Park
Keyword(s):  
Design Method ◽  
Optimization Technique ◽  
Evolutionary Process ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mix Design ◽  
Aggregate Concrete ◽  
Fitness Functions ◽  
Mix Proportion ◽  
Object Problem

Various desired performances of concrete, i.e. strength, slump, durability, etc., cannot be always obtained by current conventional mix proportion design methods for recycled aggregate concrete (RAC), because recycled aggregate (RA) generally has lower quality than natural aggregate due to the residual cement paste attached on RA and various impurities. On the other hand, design of concrete mix proportion using RA can be solved as the multi-criteria problem to meet the various required performances. This paper suggests a new method for the mix proportion of RAC to reduce the number of trial mixes using genetic algorithm (GA) which has been an optimization technique to solve the multi-object problem throughout the simulated biological evolutionary process. In mix design method by GA, several fitness functions for the required properties of concrete, i.e., slump, strength, carbonation speed coefficient, price, and emission of CO2 were considered based on conventional data or adapted from various early studies. As a result, various optimum mix proportions for RAC that meet required performances were obtained according to assumed case studies.

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