{"title":"Fracture characteristics of recycled aggregate concrete using work-of-fracture and size effect methods: the effect of water to cement ratio","authors":"Hossein Fallahnejad, Seyed Rasoul Nabavian, Aliakbar Gholampour","doi":"10.1007/s43452-024-01094-2","DOIUrl":null,"url":null,"abstract":"<div><p>A correct understanding of the fracture mechanism of Recycled Aggregate Concrete (RAC) plays an important role in the design of RAC structure and also in gaining a better understanding of the behavior of structures made from it. On the other hand, one of the most important parameters that affects cracking behavior and the fracture parameters of concrete is the water to cement ratio. The main objective of this study is to investigate the effect of different water to cement ratios on the fracture behavior of RAC. To achieve this objective, 125 notched concrete beams were subjected to three-point bending experiments, with <i>W</i> ranging 0.35 to 0.7. Specific fracture energy (<i>G</i><sub><i>F</i></sub>) and characteristic length (<i>L</i><sub><i>ch</i></sub>) from work-of-fracture method and initial fracture energy (<i>G</i><sub><i>f</i></sub>), brittleness number, fracture toughness, effective length of fracture process zone (<i>C</i><sub><i>f</i></sub>), and the critical crack-tip opening displacement from size effect method were evaluated. The results illustrate that <i>G</i><sub><i>F</i></sub> and <i>G</i><sub><i>f</i></sub> increase by 34 and 64% when <i>W</i> reduces from 0.7 to 0.35, respectively. Moreover, <i>L</i><sub><i>ch</i></sub> and <i>C</i><sub><i>f</i></sub> reduce from 378 to 208 mm and from 32.5 to 17.2 mm by decreasing <i>W</i> from 0.7 to 0.35, respectively. On average, <i>G</i><sub><i>F</i></sub><i>/G</i><sub><i>f</i></sub> ratio for various <i>W</i>s attains 2.48 with the variation coefficient of 10.9%. Eventually, multivariate prediction models were developed for RACs with various <i>W</i>s. A comparison was made between prediction and experimental values of the present and previous research works.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 1","pages":""},"PeriodicalIF":4.4000,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Archives of Civil and Mechanical Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s43452-024-01094-2","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
A correct understanding of the fracture mechanism of Recycled Aggregate Concrete (RAC) plays an important role in the design of RAC structure and also in gaining a better understanding of the behavior of structures made from it. On the other hand, one of the most important parameters that affects cracking behavior and the fracture parameters of concrete is the water to cement ratio. The main objective of this study is to investigate the effect of different water to cement ratios on the fracture behavior of RAC. To achieve this objective, 125 notched concrete beams were subjected to three-point bending experiments, with W ranging 0.35 to 0.7. Specific fracture energy (GF) and characteristic length (Lch) from work-of-fracture method and initial fracture energy (Gf), brittleness number, fracture toughness, effective length of fracture process zone (Cf), and the critical crack-tip opening displacement from size effect method were evaluated. The results illustrate that GF and Gf increase by 34 and 64% when W reduces from 0.7 to 0.35, respectively. Moreover, Lch and Cf reduce from 378 to 208 mm and from 32.5 to 17.2 mm by decreasing W from 0.7 to 0.35, respectively. On average, GF/Gf ratio for various Ws attains 2.48 with the variation coefficient of 10.9%. Eventually, multivariate prediction models were developed for RACs with various Ws. A comparison was made between prediction and experimental values of the present and previous research works.
期刊介绍：
Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science.
The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics.
The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation.
In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
