Experimental Research on Mix Proportion and Compressive Size Effect of ECC in the Hygrothermal Curing Environment in South China

HE Shaohua; LI Xuming; QIU Yitao; WANG Yi

doi:10.13204/j.gyjzG21061808

Volume 52 Issue 3

Jul. 2022

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HE Shaohua, LI Xuming, QIU Yitao, WANG Yi. Experimental Research on Mix Proportion and Compressive Size Effect of ECC in the Hygrothermal Curing Environment in South China[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 164-170,226. doi: 10.13204/j.gyjzG21061808

Citation:

HE Shaohua, LI Xuming, QIU Yitao, WANG Yi. Experimental Research on Mix Proportion and Compressive Size Effect of ECC in the Hygrothermal Curing Environment in South China[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(3): 164-170,226. doi: 10.13204/j.gyjzG21061808

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Experimental Research on Mix Proportion and Compressive Size Effect of ECC in the Hygrothermal Curing Environment in South China

doi: 10.13204/j.gyjzG21061808

1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China

Received Date: 2021-06-18

Abstract

Abstract

In order to study the mix proportion and compression size effect of engineered cementitious composites (ECC) under hygrothermal curing environment with average relative humidity of 80% and daytime average temperature of 30 ℃ in spring and summer, material tests on 108 specimens in 2 categories involving variables of fly ash, polyvinyl alahol fiber (PVA) fibers, curing environment, and geometrical dimensions were conducted. Based on the experimental results, favorable mix proportions and size effect coefficients of the ECC under the hygrothermal curing environment were obtained. The results indicated that the compression, shearing, and tensile performance of ECC was determined by the amount of PVA fibers, and the fly ash contributed to the shear strength of ECC, but reduced its tensile strength. Under the hygrothermal curing environment of South China, the ECC mix proportion with 35% fly ash and 1.0% PVC fibers had the most favorable mechanical properties, and the size effect coefficients for cubic and prism strengths of the ECC were f_cu70.7∶f_cu100∶f_cu150=0.93∶1.00∶0.78 and f_c70.7∶f_c100∶f_c150=0.96∶1.00∶0.93, respectively. The temperature and humidity had obvious size effect on the prism and cube specimen with the cross section of 70.7 mm side length.
- mix proportion,
- curing environment,
- size effect,
- compressive strength

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References

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