Mechanical properties and load deflection relationship of polypropylene fiber reinforced self-compacting lightweight concrete

Altalabani, Danar; Bzeni, Dillshad K. H.; Linsel, Stefan

doi:10.1016/j.conbuildmat.2020.119084

Cited by 49 publications

(19 citation statements)

References 10 publications

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“…Polypropylene fiber concrete showed the lowest increase in density (0.2%, 0.3% and 0.3% for 0.50PF, 0.75GF and 1.00GF samples, respectively). A slight increase in density for the addition of polypropylene fibers was also reported by Altalabani et al [68]. They demonstrated the highest increase in density equal to 1.16% for samples with 0.57% polypropylene fiber addition, which is comparable to that obtained in this study, or a 0.2% increase.…”

Section: Densitysupporting

confidence: 90%

Influence of Polypropylene, Glass and Steel Fiber on the Thermal Properties of Concrete

et al. 2021

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The variety of approaches to tackle climate change reflects the size of this global problem. No technology will act as a panacea to cure the greenhouse gas emissions problem, but new building materials with byproducts or even wastes have the potential to play a major role in reducing the environmental impacts of the building sector. In this study, three potential solutions of concrete with dispersed reinforcement in the form of recycled fibers (polypropylene, glass and steel) were examined. The aim is to present a detailed analysis of the thermal properties of new building materials in an experimental approach. Concrete mixtures were prepared according to a new, laboratory-calculated recipe containing granite aggregate, a polycarboxylate-based deflocculant, Portland cement (52.5 MPa) and fibers. This experimental work involved three different contents of each fiber (0.5%, 0.75% and 1.0 wt.%), and all tests were carried after the complete curing cycle of concrete (28 days).

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Section: Densitysupporting

confidence: 90%

Influence of Polypropylene, Glass and Steel Fiber on the Thermal Properties of Concrete

et al. 2021

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“…In the other case, comparable enhancement was obtained for almost twice higher amount of fibers, like in [ 71 ] where after the addition of 0.50% of polypropylene fibers (l f /d f = 38 mm/0.91 mm) f fl increased from 3.25 to 3.70 MPa, so by 13.8%. One should also take into account the fact that in many studies the decrease of f fl was noted despite the addition of fibers, like in [ 72 , 73 , 74 ].…”

Section: Resultsmentioning

confidence: 99%

Flexural Tensile Strength of Concrete with Synthetic Fibers

Blazy

Drobiec

Wolka³

2021

Materials

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Fiber reinforcement is currently most often used in floors, railway sleepers, prefabricated structural elements such as slabs, beams and tanks, and in small architecture elements. Designing elements or structures made of fiber-reinforced concrete requires knowledge of its basic mechanical parameters. In the case of concretes with metallic fibers, the literature can find many tests and standard guidelines regarding compressive, flexural, tensile strength and fracture energy. The properties of concretes with non-metallic fibers are slightly less recognized, especially concretes with new types of polymer fibers. Additionally, the lack of standardized methods of testing concrete with polymer fibers make their application much more difficult. In the article, the possibility of using the EN 14651 standard to assess the flexural tensile strength of concrete with the addition of 2.0 and 3.0 kg/m3 of synthetic fibers with different geometry and form was presented. There was a 5.5–13.5% increase in the flexural tensile strength depending on the mixture type. Moreover, in the case of fiber-reinforced concretes, the ductility was enhanced and the samples were characterized by significant residual flexural tensile strengths. Additionally, from the workability tests it was concluded that after the incorporation of fibers, the consistency class decreased by one, two or three. Nevertheless, the compressive strengths of concrete with and without fibers were very similar to each other, and varied from 58.05 to 61.31 MPa. Moreover, it was concluded that results obtained from three-point bending tests significantly differed from empirical formulas for the calculation of the flexural tensile strength of fiber-reinforced concretes with dispersed steel fibers present in the literature. As a result, the new formula determined by the authors was proposed for concrete with polymer fibers with a nominal fiber content ≤1.0% and slenderness of up to 200. It must be mentioned that the formula gave a very good agreement with studies presented in different literature positions. In addition, an attempt was made to evaluate the strengths of tested mixes in accordance with the Model Code 2010. However, it occurred that the proposed fiber-reinforced concrete mixtures would not be able to replace traditional reinforcement in a form of steel bars. Furthermore, in uniaxial tensile tests, it was not possible to determine the σ–w graphs, and received results for maximum tensile strength did not show the clear influence of fibers incorporation on concrete. Then, the fracture energy enhancement (from about 16 to 22 times) and dependencies: crack mouth opening displacement–deflection; crack mouth opening displacement–crack tip opening displacement; and crack tip opening displacement–deflection were analyzed. Finally, the results from flexural tensile tests were compared with measurements of the surface displacement field obtained through the Digital Image Correlation technique. It was concluded that this technique can be successfully used to determine the crack mouth and crack tip opening displacements with very high accuracy.

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“…The comparison with Figure 14a shows that the influence of the 6-mm fiber on the elastic modulus of the mortar was less than the 3-mm fiber. Previous studies [53][54][55] have also shown that fibers do not significantly change the elastic modulus and compressive strength of the specimen. The conclusions obtained in Figure 14 were roughly consistent with those obtained in Figure 13.…”

Section: Fibersmentioning

confidence: 81%

“…When the polypropylene fiber content was 0.2%, the effect of improving the toughness was the best. Danar Altalabani et al [54] concluded that fibers can enhance the ductility of cement-based materials, but considers that only the use of macroscopic and hybrid fibers can significantly improve the toughness. Although the curve with the lowest slope in Figure 14b was the 0.2% fiber content, the difference among the slopes of the five curves was small.…”

Section: Discussionmentioning

confidence: 99%

Investigation and Preparation of the Plastering Mortar for Autoclaved Aerated Blocks Walls

Feng

Shi

et al. 2021

Crystals

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The increase in the use of aerated concrete blocks (AAB) in construction walls has increased the demand for specialized plastering mortar, which should have the characteristics of high water retention, low water absorption, low thermal conductivity and high toughness. This study scrutinized the potential of expanded and vitrified small ball (EVSB) and expanded perlite as lightweight aggregates, and the beneficial effect of a modifying additive based on a mixture of ethylene-vinyl acetate (EVA), hydroxypropyl methylcellulose (HPMC) and fibers has been proved. The dry density, consistency, water absorption, mechanical strength, pore characteristics and micro morphology of the plaster mortar were evaluated. It is manifested by enhanced toughness, reduced dry density, and optimized pore structure characteristics. The relationship between mass water absorption and freeze-thaw cycle resistance is established, which shows that when the mass water absorption is 20%, the mortar exhibits better freeze resistance. After 25 freeze-thaw cycle tests, the mass loss was 0.26% and the strength loss was 1.41%. Through the comparison of test results, a new composition of plastering mortar is provided: cement: fly ash: water: heavy calcium carbonate: quartz sand: EVSB: EVA: HPMC (100,000 mPa·s): fiber = 70: 30: 76: 12: 250: 24: 2: 0.3: 0.2.

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Mechanical properties and load deflection relationship of polypropylene fiber reinforced self-compacting lightweight concrete

Cited by 49 publications

References 10 publications

Influence of Polypropylene, Glass and Steel Fiber on the Thermal Properties of Concrete

Influence of Polypropylene, Glass and Steel Fiber on the Thermal Properties of Concrete

Flexural Tensile Strength of Concrete with Synthetic Fibers

Investigation and Preparation of the Plastering Mortar for Autoclaved Aerated Blocks Walls

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