Mesomechanism of steel fiber reinforcement and toughening of reactive powder concrete

Ju, Yang; Jia, YuDan; Liu, Hongbin; Chen, Jian

doi:10.1007/s11431-007-0079-0

Cited by 31 publications

(29 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A phenomenon of jumpnddown in load continuously emerged within post-peak stages, accompanied by clear frequency-fixed noises (similar phenomena were found in ref. [6]). The post-peak stage of P-δ curve gradually slides down, as shown in Figure 2, except that a sudden load drop occurs at the fiber content of 1.0%.…”

Section: Figurementioning

confidence: 99%

“…However, the situation changes when fibers are embedded in RPC beams. Due to the effective interfacial bonds between fibers and the matrix and its function on the crack propagation [6] , the external work is mainly dissipated to pull out the fibers across the cracking path and generate new cracks at the tip of the preset notch. This brings up steady crack growth from the crack initiation through the post-peak period.…”

Section: Deformation Of Notched Beams and Toughness Characteristicsmentioning

confidence: 99%

“…RPC presents much better toughness after fibers have been embedded in refs. [1][2][3][4][5][6][7][8][9]. Pioneer investigations showed that with proper fabrication techniques and certain fiber volumes, the flexural tensile strength of RPC hit 100 MPa and the rupture energy capacity reached 4×10 4 J/m 2 .…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, fundamental investigations on deformability and toughness of RPC have been carried out [1][2][3][4][5][6][7][8][9] . The findings indicated that strong inconsistency and incomparability in toughness measurements were caused by the varied mixture ratios, specimen sizes and measuring techniques.…”

Section: Introductionmentioning

confidence: 99%

“…The strong interfacial bond strength between fibers and gel causes a large number of gel particles to attach on the fibers as they are pulled out from RPC [6] . Load-deforLoad-deformation curves present the evident first-crack initiation before peak loads and multiple peaks within post-peak periods [6,29] . The uniqueness distinguishes RPC from normal fibered concrete regarding the crack initiation, crack propagation and energy absorption.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Toughness and characterization of reactive powder concrete with ultra-high strength

Liu

Chen

et al. 2009

Sci. China Ser. E-Technol. Sci.

Self Cite

View full text Add to dashboard Cite

A number of three-point bending and fracture tests of 200 MPa-level reactive powder concrete (RPC) with the various fiber contents have been conducted to probe the nature and characteristics of toughness of RPC200. The contribution of the embedded fibers to improving the crack-resistant capacity, energy absorption capacity and toughness with various deformation mechanisms has been analyzed. Taking account of that the first-crack deformation, peak-load deformation and their improvement varied with the fiber contents and that the deformation mechanism affected differently the performance at the first crack and the peak load, we took the peak-load deformation of plain RPC200 as the reference deformation to measure the toughness of fibered RPC200. Two toughness indices T 2(n−1) (n) and FT 2(n−1) (n) have been formulated based on P-δ responses and P-CMOD responses. The indices quantify the toughness of RPC200 with the various deformation mechanisms relative to perfectly elastoplastic materials by setting the toughness level 2(n−1) as the initial reference. It is shown that the toughness index T 2(n−1) (n) reflects the function of fibers to improve the toughness of RPC with the deformation throughout specimens, but overestimates the contribution to enhancing the toughness in post-peak periods. It underestimates, on other hands, the contribution to improving the toughness in the period from the first crack to the peak load. In contrast, the toughness index FT 2(n−1) (n) properly presents the capability that fibers absorb energy and constrain crack propagation in the matrix when the deformation is concentrated on the open crack. The proposed index unveils the contribution of fibers to toughening RPC200 both in the period from the first-crack to the peak load and in the period of post peak. This characterization method not only reveals the nature of toughness but also levels the toughness of RPC200. It could provide a way to establish an objective toughness characterization for RPC200 and facilitate its applications. reactive powder concrete, toughness, characterization index, deformation mechanism, flexure, fracture

show abstract

Section: Figurementioning

confidence: 99%

Section: Deformation Of Notched Beams and Toughness Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Toughness and characterization of reactive powder concrete with ultra-high strength

Liu

Chen

et al. 2009

Sci. China Ser. E-Technol. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

CT Identification and Fractal Characterization of 3‐D Propagation and Distribution of Hydrofracturing Cracks in Low‐Permeability Heterogeneous Rocks

Liu

Gao

et al. 2018

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

Understanding and characterization of the three‐dimensional (3‐D) propagation and distribution of hydrofracturing cracks in heterogeneous rock are key for enhancing the stimulation of low‐permeability petroleum reservoirs. In this study, we investigated the propagation and distribution characteristics of hydrofracturing cracks, by conducting true triaxial hydrofracturing tests and computed tomography on artificial heterogeneous rock specimens. Silica sand, Portland cement, and aedelforsite were mixed to create artificial heterogeneous rock specimens using the data of mineral compositions, coarse gravel distribution, and mechanical properties that were measured from the natural heterogeneous glutenite cores. To probe the effects of material heterogeneity on hydrofracturing cracks, the artificial homogenous specimens were created using the identical matrix compositions of the heterogeneous rock specimens and then fractured for comparison. The effects of horizontal geostress ratio on the 3‐D growth and distribution of cracks during hydrofracturing were examined. A fractal‐based method was proposed to characterize the complexity of fractures and the efficiency of hydrofracturing stimulation of heterogeneous media. The material heterogeneity and horizontal geostress ratio were found to significantly influence the 3‐D morphology, growth, and distribution of hydrofracturing cracks. A horizontal geostress ratio of 1.7 appears to be the upper limit for the occurrence of multiple cracks, and higher ratios cause a single crack perpendicular to the minimum horizontal geostress component. The fracturing efficiency is associated with not only the fractured volume but also the complexity of the crack network.

show abstract

Effect of different fibers (steel fibers, glass fibers, and carbon fibers) on mechanical properties of reactive powder concrete

Raza

Qureshi

Ali

et al. 2020

Structural Concrete

View full text Add to dashboard Cite

In the present study, reactive powder concrete (RPC) was investigated with three different types of single fibers that is, steel fiber (SF), glass fiber (GF), and carbon fiber (CF). Moreover, the effect of hybrid SF‐GF, GF‐CF, and CF‐SF on RPC was also investigated. In case of both single and hybrid fiber‐reinforced RPCs, a constant volume fraction of 2% fiber was used. A plain RPC was also produced that served as a reference/control mix. Studied parameters include compressive strength, modulus of elasticity, peak strains in compression, compression toughness, total energy absorbed in compression, splitting tensile strength, and flexural strength. Results showed that among single fiber‐reinforced RPCs, CF‐RPC performed better than both SF‐ and GF‐RPC in compression. Whereas, single SF‐RPC performed better than GF‐ and CF‐RPC in splitting tensile and flexural strength, single SF‐RPC showed significant softening response compared with single CF and GF‐RPC. CF‐RPC showed comparable performance to that of the SF‐RPC in both tensile and flexural strength. But CF‐RPC showed lower toughness than SF‐RPC. Hybridization of 1%SF and 1%CF yielded maximum overall mechanical performance among both single and hybrid fiber RPCs. Maximum attribution (17–38%) of fibers was toward flexural strength compared to other strength properties.

show abstract

Mesomechanism of steel fiber reinforcement and toughening of reactive powder concrete

Cited by 31 publications

References 6 publications

Toughness and characterization of reactive powder concrete with ultra-high strength

Toughness and characterization of reactive powder concrete with ultra-high strength

CT Identification and Fractal Characterization of 3‐D Propagation and Distribution of Hydrofracturing Cracks in Low‐Permeability Heterogeneous Rocks

Effect of different fibers (steel fibers, glass fibers, and carbon fibers) on mechanical properties of reactive powder concrete

Contact Info

Product

Resources

About