Effect of low-modulus polypropylene fiber on physical and mechanical properties of self-compacting concrete

Akhmetov, Daniyar; Akhazhanov, Sungat; Jetpisbayeva, Ainur Zhenisbekkyzy; Pukharenko, Yu. V.; Root, Yelena; Utepov, Yelbek; Akhmetov, Akbulat

doi:10.1016/j.cscm.2021.e00814

Cited by 16 publications

(15 citation statements)

References 7 publications

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“…The minimum requirement for SCC fresh concrete can still be achieved by adding PET fiber up to 0.50%, both in SCC variants and with and without adding fly ash as SCM. These results align with previous researchers who stated that adding fiber and fine powder to the mixture reduces the workability and other related fresh properties of SCC production [35,39,40]. The decrease in the workability of concrete can be caused by the presence of PET fiber, which causes an increase in the surface area of the filler material, requiring more lubrication.…”

Section: Discussionsupporting

confidence: 90%

“…Regardless of the slight decrease in the density and compressive strength of concrete slightly decreased, the flexural strength of concrete can still increase. It is achieved because the fiber can inhibit the cracks' propagation and spread and bridge the cracks that occur due to the emergence of tensile stress in the concrete specimens, as stated by previous researchers [39,40]. Therefore, the failure of the concrete beam with PET fiber is not concentrated in a particular location only.…”

Section: Discussionmentioning

confidence: 95%

“…Experiments from many previous researchers have shown different results [32][33][34][35][36][37][38][39][40][41]. All researchers reported that adding fiber from waste materials into concrete mixes reduces the workability of the concrete.…”

Section: Introductionmentioning

confidence: 98%

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Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

et al. 2023

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This study aims to utilize fly ash and waste PET bottles for producing more sustainable self-compacting concrete (SCC) with better mechanical strength. Fly ash is utilized as a supplementary cement material and waste PET bottles as fiber reinforcement to improve its flexural strength and achieve the targeted compressive strength. The experimental works were conducted on eight variations using 80 specimens, divided into two main groups of partial cement replacement using 0% and 15% fly ash by weight. The two variants are added with PET fiber based on the volume fractions of 0%, 0.25%, 0.50%, and 0.75%. Fresh concrete was tested using the slump flow method (T50) and the Visual Stability Index (VSI) based on ASTM 1611. The hardened concrete tests are conducted after 56 days and include testing the concrete's compressive strength, flexural strength, and ultrasonic pulse velocity. Test results showed that the presence of PET fiber in the SCC mix decreased its flowability. However, when added up to 0.75%, the mixes still meet the flowability requirements of fresh-state SCC. PET fiber addition tends to reduce the compressive strength, whereas the reduction in compressive strength of SCC with PET fiber without fly ash is insignificant. However, in SCC that uses fly ash, the addition of PET fiber causes a significant decrease in its compressive strength. Adding PET fiber into SCC mixes can increase flexural strength, both for the two variants: SCC without fly ash and SCC with fly ash. It can be concluded that PET waste fiber with an aspect ratio of 40 can be added up to 0.5% for SCC without fly ash and up to 0.25% by volume fraction for SCC with fly ash addition. The ultrasonic pulse velocity test results have an excellent tendency to predict the concrete's compressive and flexural strengths. Therefore, the UPV test can be applied for the non-destructive test evaluation of PET fiber-reinforced SCC. Doi: 10.28991/CEJ-2023-09-02-014 Full Text: PDF

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 95%

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Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

et al. 2023

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“…In study of mixture compositions the following results were obtained: the use of microfiber in the amount of 2% by volume or more [51][52][53][54][55]; the use of rheologically active mineral additives in cement matrices with a superplasticizer to ensure workability at low W/C ratio and at high microfiber amount [56,57]; the use of mineral additives that improve workability and setting time in alkali-activated slag matrices [58][59][60][61]; the use of quartz sand with a low fineness modulus as a fine aggregate to obtain a homogeneous matrix and ensure a dense and uniform contact of matrix with the microfiber surface [62][63][64][65][66][67][68]. Manufacturing technology takes into account: the sequence of addition of components into a mixture [69][70][71][72][73]; mixing modes [62,[74][75][76][77].…”

Section: Manufacturing Proceduresmentioning

confidence: 99%

“…An increase in density can be achieved by reducing the water-to-cement ratio using a superplasticizer and rheologically active mineral additives. High filling with microfiber can be achieved by justifying the choice of the type of concrete mixer [68][69][70][71], the sequence of addition of components [72][73][74], and the speed and duration of mixing [62,[75][76][77]. A laboratory automatic mixer for mortars from Tinius Olsen was used to prepare the mixtures (Figure 2).…”

Section: Manufacturing Proceduresmentioning

confidence: 99%

Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

Smirnova

Pidal²,

Alekseev³

et al. 2022

Materials

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A comparative study of the fracture features, strength and deformation properties of pseudo strain-hardening composites based on alkali-activated slag and Portland cement matrices with polypropylene microfiber was carried out. Correlations between their compositions and characteristics of stress–strain diagrams under tension in bending with an additional determination of acoustic emission parameters were determined. An average strength alkali-activated slag matrix with compressive strength of 40 MPa and a high-strength Portland cement matrix with compressive strength of 70 MPa were used. The matrix compositions were selected for high filling the composites with polypropylene microfiber in the amount of 5%-vol. and 3.5%-vol. ensuring the workability at the low water-to-binder ratios of 0.22 and 0.3 for Portland cement and alkali-activated slag matrices, respectively. Deformation diagrams were obtained for all studied compositions. Peaks in the number of acoustic signals in alkali-activated slag composites were observed only in the strain-softening zone. Graphs of dependence of the rate of acoustic events occurrence in samples from the start of the test experimentally prove that this method of non-destructive testing can be used to monitor structures based on strain-hardening composites.

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Effect of water to cement (W/C) ratio and age on mechanical behavior of tire‐recycled steel fiber reinforced concrete

Karimi

Ebneabbasi

Karamzadeh

et al. 2022

Structural Concrete

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The annual entrance of billions of used tires into landfills has caused tremendous environmental concerns, while the recycled steel fibers from these tires can improve the mechanical characteristics of construction materials, including cement concrete. In this paper effect of the addition of recycled steel fibers on mechanical characteristics of ordinary cement concrete with different water to cement ratios are studied; to achieve that, compressive and flexural specimens are exanimated using standard test methods with four general mix designs. The range of recycled steel fibers is chosen as 0%, 1%, 2%, 3%, and 4% (per unit weight), and optimal fiber percentages based on water to cement ratios are also calculated. Results show that using recycled steel fibers positively affects all the mix designs, especially ductility, and postfracture energy absorption increases with the increase of fiber content. Fiber addition increases the compressive and flexural strength by about 25% and 58%, respectively. Depending on the water to cement ratio, the optimum percentage of recycled steel fiber for concretes with 0.6, 0.5, and 0.4 water to cement ratios are 3.0%, 2.3%, and 1.8% of unit weight, respectively. K E Y W O R D Scompressive and flexural strength, fiber-reinforced concrete, green environment, mix-design, recycled steel fiber

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Effect of low-modulus polypropylene fiber on physical and mechanical properties of self-compacting concrete

Cited by 16 publications

References 7 publications

Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

Development of Eco-friendly Self-compacting Concrete Using Fly Ash and Waste Polyethylene Terephthalate Bottle Fiber

Strain Hardening of Polypropylene Microfiber Reinforced Composite Based on Alkali-Activated Slag Matrix

Effect of water to cement (W/C) ratio and age on mechanical behavior of tire‐recycled steel fiber reinforced concrete

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