Fracture mode analysis of cementitious mortars by simultaneous application of 4D-XCT and acoustic emission technique

Deresse, Nuhamin Eshetu; Van Steen, Charlotte; Soete, Jeroen; Sarem, Mina; vanhulst, Johan; Wevers, Martine; François, Stijn; Verstrynge, Els

doi:10.1016/j.conbuildmat.2024.135486

Cited by 7 publications

(2 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies in this domain have revealed that micro-fracture AE signals' RA value (rise time/amplitude) and AF value (ring count/duration time, average frequency) can serve as indicators of brittle material crack tensile or shear properties, facilitating further classification of micro-fracture forms [58]. The characteristic parameters of AE signals are visually represented in Figure 8.…”

Section: Strength and Failure Behavior Under Uniaxial Compressionmentioning

confidence: 99%

“…Different micro-fracture behaviors correspond to different AE information characteristics. Therefore, this study obtained the tensile-shear properties of brittle materials by judging the difference of AE information, discussed the evolution process and law of crack development induced by tensile stress and shear stress at the meso-level, and further explained the internal tensileshear failure mechanism of materials.Studies in this domain have revealed that micro-fracture AE signals' RA value (rise time/amplitude) and AF value (ring count/duration time, average frequency) can serve as indicators of brittle material crack tensile or shear properties, facilitating further classification of micro-fracture forms[58]. The characteristic parameters of AE signals are visually represented in Figure8.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Study on Static Mechanical Properties and Numerical Simulation of Coral Aggregate Seawater Shotcrete with Reasonable Mix Proportion

Peng,

Yu,

et al. 2024

Materials

View full text Add to dashboard Cite

This study aims to explore the static mechanical characteristics of coral aggregate seawater shotcrete (CASS) using an appropriate mix proportion. The orthogonal experiments consisting of four-factor and three-level were conducted to explore an optimal mix proportion of CASS. On a macro-scale, quasi-static compression and splitting tests of CASS with optimal mix proportion at various curing ages employed a combination of acoustic emission (AE) and digital image correlation (DIC) techniques were carried out using an electro-hydraulic servo-controlled test machine. A comparative analysis of static mechanical properties at different curing ages was conducted between the CASS and ordinary aggregate seawater shotcrete (OASS). On a micro-scale, the numerical specimens based on particle flow code (PFC) were subjected to multi-level microcracks division for quantitive analysis of the failure mechanism of specimens. The results show that the optimal mix proportion of CASS consists of 700 kg/m3 of cementitious materials content, a water–binder ratio of 0.45, a sand ratio of 60%, and a dosage of 8% for the accelerator amount. The tensile failure is the primary failure mechanism under uniaxial compression and Brazilian splitting, and the specimens will be closer to the brittle material with increased curing age. The Brazilian splitting failure caused by the arc-shaped main crack initiates from the loading points and propagates along the loading line to the center. Compared with OASS, the CASS has an approximately equal early and low later strength mainly because of the minerals’ filling or unfilling effect on coral pores. The rate of increase in CASS is swifter during the initial strength phase and decelerates during the subsequent stages of strength development. The failure in CASS is experienced primarily within the cement mortar and bonding surface between the cement mortar and aggregate.

show abstract

Section: Strength and Failure Behavior Under Uniaxial Compressionmentioning

confidence: 99%

mentioning

confidence: 99%