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.

GENETIC-ALGORITHM-BASED MIX PROPORTION DESIGN METHOD FOR RECYCLED AGGREGATE CONCRETE

2013 ◽  
Vol 37 (3) ◽  
pp. 345-354 ◽  
Author(s):  
Wonjun Park
Keyword(s):  
Design Method ◽  
Evolutionary Process ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Performance Criteria ◽  
Aggregate Concrete ◽  
Fitness Functions ◽  
Mix Proportioning ◽  
Mix Proportion ◽  
Optimal Mix

Several desirable characteristics of concrete, such as strength, slump, durability and low CO2 emission, cannot always be obtained by current conventional mix proportion design methods for recycled aggregate concrete (RAC), because Recycled aggregate generally has lower quality than natural aggregate owing to residual cement paste and various impurities. We treat optimal concrete mix proportioning as a multi-criteria problem, and suggest a new method based on genetic algorithms (GAs) to solve the mix proportion design problem for RAC through a simulated biological evolutionary process. In this method, several fitness functions for the desired properties of concrete, i.e., slump, strength, carbonation speed coefficient, price, and emission of CO2, were considered based on conventional data or adopted from previous studies. We thus arrived at optimal mix proportions for RAC that meet the desired performance criteria.

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.

Mix Proportion Design and Material Requirements of Road Recycled Aggregate Concrete

2013 ◽  
Vol 661 ◽  
pp. 171-174
Author(s):  
Feng Xiang Deng ◽  
Sheng Li
Keyword(s):  
Design Method ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Technical Requirements ◽  
Mix Proportion ◽  
Binder Ratio ◽  
Proper Design ◽  
Mixing Proportion ◽  
The Impact

When the recycled aggregate is crushed, many micro-cracks can be observed and some grout can remain on it. The aggregate therefore severely absorbs water when it is later mixed with concrete. The impact of water-binder ratio on strength becomes different from that of the ordinary concrete, and the ratio can no longer be used to evaluate the strength accurately. To solve this problem, this paper describes the mix proportion design method of recycled aggregate concrete, including the requirement of mix proportion design, the calculation for mixing proportion parameters and the technical requirements of recycled aggregate, natural aggregate, fly ash and admixtures. The manufacture of specimens is also described. This work provides guidance for the proper design of mix proportion of recycled aggregate concrete.

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