Engineered cementitious composites using blended limestone calcined clay and fly ash: Mechanical properties and drying shrinkage modeling

Concern about carbon reduction in the construction industry is growing. Engineered cementitious composites (ECC) have been extensively studied for their potential sustainability, continuous efforts are being made for a greener ECC. In this study, a new type of low-carbon supplementary cementitious m...

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Bibliographic Details
Published in:Case Studies in Construction Materials 2024-07, Vol.20, p.e02960, Article e02960
Main Authors: Chen, Weige, Zhu, Haitang, Li, Yang, Yang, Lin, Cheng, Shengzhao, Yu, Haotian
Format: Article
Language:English
Subjects:
Drying shrinkage
Engineered cementitious composites
Limestone calcined clay
Mechanical properties
Supplementary cementitious materials
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Summary:Concern about carbon reduction in the construction industry is growing. Engineered cementitious composites (ECC) have been extensively studied for their potential sustainability, continuous efforts are being made for a greener ECC. In this study, a new type of low-carbon supplementary cementitious materials (SCMs), limestone calcined clay (LC2), was blended with fly ash (FA) as the cementitious materials of ECC. A series of experiments were carried out to study the effects of blended LC2/FA on the mechanical properties and drying shrinkage of ECC materials, XRD and MIP were also used to explain the mechanism. The results show that LC2 can accelerate the hydration, improve the mechanical properties of ECC, especially in the early age. The addition of LC2 can improve the flexural bearing capacity, but weaken the bending deformation capacity and affect the flexural toughness. The increase of LC2 content significantly refined the pore size, thus reduced the drying shrinkage. In addition, based on the drying shrinkage model of ordinary concrete, the improved drying shrinkage model proposed in this study can accurately describe the drying shrinkage behavior of ECC. •Blended LC2 and FA was introduced into the cementitious materials of ECC.•The mechanical properties of ECC containing LC2 had significantly improved.•LC2 densified the matrix, which significantly alleviated drying shrinkage.•An improved model was proposed for predicting the drying shrinkage of ECC.
ISSN:2214-5095
2214-5095
DOI:10.1016/j.cscm.2024.e02960