New Mix Design Method for Recycled Concrete Using Mixed Source Concrete Coarse Aggregate

Xiaomeng Ding, Jian Li Hao, Zhongfan Chen*, Jianan Qi, Meloni Marco

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Abstract: This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should be pre-wetted before casting. Its weighted mean strength has a value of 43.1 MPa for two strengths of SC. Compressive and splitting tensile strength tests on recycled concrete with CRCA (100% substituting limestone aggregate) made from two mixed SC with varying strengths, have been implemented to acquire the mix design method. For investigating the influence of CRCA from two strengths of SC on recycled concrete performance, test parameters of mechanical behavior including compressive strength of SC, strength difference between two mixes of SC, and proportion of two mixed CRCA were taken into account. Test results indicate that when one of the two mixed SC strengths is similar to the target strength, two requirements have to be satisfied to achieve the target compressive strength: one of the SC has to be more than 10 MPa higher than the target strength, and the proportion of the higher strength SC is larger than 75% in weight of the total CRCA. The results provide useful information for recycling multiple strength SC. Graphic Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)5431-5443
Number of pages13
JournalWaste and Biomass Valorization
Volume11
Issue number10
DOIs
Publication statusPublished - 1 Oct 2020

Keywords

  • Coarse recycled concrete aggregate
  • Compressive strength
  • Source concrete
  • Splitting tensile strength
  • Weighted mean strength

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