Four‑point bending test of high‑early‑strength high ductility concrete (HES‑HDC): early mechanical behavior and toughness evaluation

• Autorzy: Yang Jiasheng , Deng Mingke , Zhang Yangxi , Fan Hongkan

Identyfikatory

DOI

10.1007/s43452-023-00847-9

• Języki publikacji: EN

Abstrakty

EN

To investigate the early mechanical response of high-early-strength high ductility concrete (HES-HDC), a four-point bending test was conducted. The effects of fiber type, fiber content, curing age, sand-binder ratio (s/b), and hydroxypropyl methyl-cellulose (HPMC) content on the crack pattern, load–deflection curve, flexural strength, and deflection of HES-HDC were studied. Based on the test results, a flexural toughness evaluation method suitable for the characteristics of HDC was proposed. The results showed that under flexural load, the load–deflection curve of HES-HDC exhibited a deflection-hardening response, with multiple cracks developed during the failure process. The flexural strength of HES-HDC reaches more than 5 MPa in 2 h, meeting the requirements for open traffic. Fiber type, fiber content, and curing age had a significant impact on the cracking behavior, deflection-hardening response, and flexural strength of HES-HDC. The higher the fiber pullout proportion and bridging stress during the crack-bridging was, the higher the deflection and energy absorption of HES-HDC exhibited. The existing flexural toughness evaluation methods were not applicable for HDC assessment due to their inability to consider the influence of different fiber types on the deflection-hardening response of HDC. A flexural toughness index in the form of energy ratio and a flexural strength coefficient in the form of strength ratio was proposed, which can effectively evaluate the flexural toughness of the HES-HDC beam during its whole loading process. This method took into account the large deformation of HDC and eliminated the influence of specimen size by using dimensionless forms.

Słowa kluczowe

EN

high ductility concrete; high-early-strength; flexural strength; deflection-hardening response; flexural toughness

PL

beton o wysokiej odporności; wytrzymałość na zginanie; utwardzanie betonu

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2024
• Tom: Vol. 24, no. 1
• Strony: art. no. e36, 2024
• Opis fizyczny: Bibliogr. 41 poz., rys., tab., wykr.

Twórcy

autor

Yang Jiasheng

• School of Civil Engineering, Xi’an University of Architecture & Technology, No. 13, Yanta Road, Xi’an 710055, Shaanxi, China

autor

Deng Mingke

• School of Civil Engineering, Xi’an University of Architecture & Technology, No. 13, Yanta Road, Xi’an 710055, Shaanxi, China

• https://orcid.org/0009-0007-1370-9085

autor

Zhang Yangxi

• School of Civil Engineering, Xi’an University of Architecture & Technology, No. 13, Yanta Road, Xi’an 710055, Shaanxi, China

autor

Fan Hongkan

• Sichuan Institute of Building Research, No. 55, No. 3 North Section of the First Ring Road, Jinniu District, Chengdu 610081, Sichuan, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)