Experimental Tests and Reliability Analysis of the Cracking Impact Resistance of UHPFRC

Jabir, Hussain A.; Abid, Sallal R.; Murali, G.; Ali, Sajjad H.; Klyuev, Sergey; Fediuk, Roman; Vatin, Nikolai; Promakhov, Vladimir; Vasilev, Yuriy

doi:10.3390/fib8120074

Cited by 77 publications

(42 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies that used steel fiber, polypropylene fiber and other synthetic fibers revealed a distinguished superiority of steel fibers, both in mono-fashion or when combined with synthetic fibers, where it could better improve the stiffness, tensile strength, flexural strength, ductility, shear strength and energy absorbance capacity [ 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ], which totally supports the obtained results in this research. Scorza et al [ 44 ] tested different combinations of different length steel and polypropylene fibers and indicated that steel mono-fiber reinforced mixture retained the best fracture results and post-peak performance under mode I fracture test.…”

Section: Resultssupporting

confidence: 90%

Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites

et al. 2021

Self Cite

View full text Add to dashboard Cite

This research aims to examine the fracture toughness of hybrid fibrous geopolymer composites under mode II. For this purpose, eight geopolymer mixtures were cast and tested to evaluate the influence of steel and synthetic fiber hybridization on mode II fracture response. The first mixture was plain and was kept as a reference, while steel, polypropylene and glass fibers were used in the rest seven mixtures. The first three of which were mono-reinforced with one of the three fibers, while the rest of the four were hybrids reinforced with combinations of steel and synthetic fibers. The Brazilian center notched disc and the double notched cube test configurations were used to evaluate the mode II fracture toughness of the eight mixtures. The results of the tests showed that steel fibers played the vital role in enhancing the fracture toughness, where the mixtures S1.6 and S1.3G0.3 showed the best performance. The results also showed that increasing the notch depth decreased the fracture toughness with an approximate linear decrement fashion. It was found that the use of double-notched cubes resulted in much higher fracture toughness than the Brazilian notched discs, where the ratio of normalized fracture toughness of the disc specimens to cube specimens was approximately 0.37 to 0.47. This is attributed to the concentration of stresses along one defined path in the disc specimens compared to the multi-path stresses in the cube specimens. In addition, the accompanied tensile stresses in the disc specimens may lead to a mode I fracture before the designed mode II fracture.

show abstract

Section: Resultssupporting

confidence: 90%

Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…As seen in Table 1 , several researchers revealed a significant COV from the drop-weight impact test. Drop-weight impact findings on various types of fibrous concrete clearly showed strong scattering in test results, which was consistent with previous research [ 45 , 53 , 55 , 56 , 58 , 66 , 67 , 68 ].…”

Section: Discussion Of Resultssupporting

confidence: 92%

Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

2021

Self Cite

View full text Add to dashboard Cite

This research examined the performance of functionally graded two-stage fibrous concrete (FTSFC) against modified repeated falling-mass impacts. This study led to the concept of creating improved multiphysics model of fibre composites with better impact resistance for potential protective constructions. FTSFC was developed based on the bio-inspiring strength of turtle shells. The excellent impact resistance of FTSFC was accomplished by including a larger quantity of steel and polypropylene fibres in the outer layers. At the same time, one- and two-layered concrete were cast and compared to evaluate the efficiency of three-layered FTSFC. To minimize the dispersed test results, a modified form of the 544 drop-mass impact test was recommended by the American Concrete Institute (ACI). The modification was a knife-edge notched specimen instead of a solid cylindrical specimen without a notch. This modification predefined a crack path and reduced the dispersion of results. Cracking and failure impact numbers, ductility index, and failure mode were the testing criteria. The suggested modification to the ACI impact test decreased the coefficient of variance, showing that the dispersion of test results was reduced significantly. This study led to the concept of creating improved, fibre composites with better impact resistance for potential protective constructions.

show abstract

“…This phenomenon is due to the presence of fibre in concrete which distributes uniformly, restricting the macro crack formation, alleviating the concentration of stress. Consequently, changing the direction of cracks due to fibre-bridging action leads to delays in crack growth and failure [25,26]. In general, the percentage of SF in conventional fibrous concrete is restricted to 2% due to fibre balling, which creates poor fibre distribution and more internal flaws, leading to reduced compressing strength [27,28].…”

Section: Compressive Strengthmentioning

confidence: 99%

“…This means that the enhancement in impact resistance of the fibrous mixtures is majorly due to incorporating steel fibres, with a percentage share of not less than 90% of the total percentage impact improvement. The use of steel fibres is widely proven to dramatically improve the fracture behaviour and impact resistance of concrete mixtures [25,39]. The smaller contribution of MWCNT was discussed in the previous paragraphs, while the limited contribution of GFM compared the total improvement in H1 and H2 can be attributed to: first, their localised function as only an intermediate barrier between the two layers, and second, to their lower strength compared to steel fibres.…”

Section: Cracking and Failure Impact Numbermentioning

confidence: 99%

Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading

et al. 2021

Self Cite

View full text Add to dashboard Cite

The use of expanded clay aggregate (ECA) for developing lightweight concrete results in strength-reduction properties. However, the ECA-based concrete strength properties can be improved by adding steel fibre (SF), glass fibre mesh (GFM) and multi-walled nano-carbon tubes (MWCNT). The combined effect of MWCNT, GFM, SF and ECA-based concrete and its strength properties is still unexplored. It is worth drawing a logical conclusion concerning the impact on the strength of concrete by incorporating the materials mentioned above. Two-stage expanded clay aggregate fibrous concrete (TECAFC) is a new concrete type and an emerging research area in material engineering. The casting method of TECAFC includes the two essential phases as follows. First, ECA and fibres are filled into the empty cylindrical mould to develop a natural skeleton. Second, the grout comprising cement, sand and MWCNT, are injected into the developed skeleton to fill voids. In this research, eight mixtures were prepared with 0.1 and 0.2% of MWCNT, 2.5% dosage of SF and three different layers of GFM inserted between the two layers of concrete. These eight mixtures were divided into two series of three mixtures each, in addition to two reference mixtures that include no SF or GFM. The first series of mixtures was comprised of 0.1% of MWCNT and 2.5% of SF and one, two and three layers of GFM insertion. The second series was the same as the first series and the dosage of MWCNT was taken as 0.2%. All cylindrical specimens were tested under drop mass impact as per the suggestions made by the ACI Committee 544. The test results showed that incorporating steel fibres and GFM improved the cracking and failure impact resistance by more than 270 and 1100%, respectively, and increased the impact ductility index by more than 220%, significantly contributing to steel fibres.

show abstract

Experimental Tests and Reliability Analysis of the Cracking Impact Resistance of UHPFRC

Cited by 77 publications

References 49 publications

Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites

Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites

Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading

Contact Info

Product

Resources

About