A Comprehensive Study of the Polypropylene Fiber Reinforced Fly Ash Based Geopolymer

Ranjbar, Navid; Mehrali, Mehdi; Behnia, Arash; Pordsari, Alireza Javadi; Sadeghinezhad, Emad; Alengaram, U. Johnson; Jumaat, Mohd Zamin

doi:10.1371/journal.pone.0147546

Cited by 127 publications

(98 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…e bulk density of AAS mortar decreased slightly with the increase of the content of PPF which is due to the low specific gravity of PPF compared with the AAS paste [61,62]. is is consistent with the findings of Ranjbar et al [59].…”

Section: Physical Propertiessupporting

confidence: 91%

“…With the increase of the content of PPF, more and more network spaces will be formed and the fluidity of mortars will be lower [58]. On the other hand, addition of PPF offers higher shear resistance to flow which results in a decrease of fluidity [59]. e research results of Zhang et al [60] showed that the fluidity of geopolymer gradually decreased with the increase of the content of PPF, which is consistent with the results of this study.…”

Section: Impact Performancesupporting

confidence: 89%

“…is may be due to the hydrophobicity of PPF, which forms a barrier between water and cement particles which reduces the hydration speed of cement and delays the initial setting time of AAS mortars. Ranjbar et al [59] got the similar results that the incorporation of polypropylene fiber delays the initial and final setting time of geopolymer composite.…”

Section: Fluidity and Setting Timementioning

confidence: 72%

See 2 more Smart Citations

Effect of Polypropylene Fiber on Properties of Alkali-Activated Slag Mortar

Chen

Wang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Alkali-activated slag (AAS) is becoming an increasingly popular building material due to its excellent engineering properties and low CO 2 emissions, but its large shrinkage is an important reason to restrict its application and popularization. is work is aimed to study the possibility of inhibiting the shrinkage of AAS mortar by incorporating polypropylene fiber (PPF). For this, an experimental study was carried out to evaluate the effects of PPF content on setting time, fluidity, physical properties, mechanical properties, impact resistance, and microstructure of AAS mortar. e volume content of PPF is 0.05%, 0.1%, 0.15%, and 0.2%. e working, physical (porosity, water absorption, and bulk density), mechanical, shrinkage, and impact resistance properties of the AAS mortars were evaluated. e results show that incorporating PPF effectively reduces the shrinkage deformation of AAS mortar, significantly improves its impact resistance, enhances its toughness, and slightly improves its compressive strength in the later stage. At the same time, PPF delays the initial setting time of AAS mortar and reduces the fluidity, density, porosity, and water absorption of AAS mortar. SEM results show that the bridging effect of PPF between AAS mortars can inhibit the generation and propagation of cracks, improve the internal microstructure, and enhance the performance of AAS mortar.

show abstract

Section: Physical Propertiessupporting

confidence: 91%

Section: Impact Performancesupporting

confidence: 89%

Section: Fluidity and Setting Timementioning

confidence: 72%

See 1 more Smart Citation

Effect of Polypropylene Fiber on Properties of Alkali-Activated Slag Mortar

Chen

Wang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…These spectra are typical of PP and one could distinguish only bands assigned to the C-H or C-C bond vibrations [41]. A detailed description and the assignment of the bands to appropriate bonds vibrations in PP was carried out in earlier papers [42,43]. However, the spectra of the i-PP films with various fillers differ from each other in the range of 1000-1200 cm −1 .…”

Section: Atr-ftir Spectroscopy Resultsmentioning

confidence: 99%

“…The shoulder at 1645 cm −1 indicates the presence of unsaturated polymer chain ends [8,26,41,44,46]. These oxygen-containing products were created during the photooxidation of the polymer, the unsaturated groups could be formed as a result of Norrish type II reactions [8,41,42,44]. This type of the reaction requires space which is created by increasing the free volume of the polymer after adding the fillers and after orientation.…”

Section: Atr-ftir Spectroscopy Resultsmentioning

confidence: 99%

Surface Studies of UV Irradiated Polypropylene Films Modified with Mineral Fillers Designed as Piezoelectric Materials

et al. 2020

View full text Add to dashboard Cite

Isotactic-polypropylene (i-PP) films with inorganic minerals such as Sillikolloid, perlite, or glass beads were prepared. The obtained polymeric films were subjected to an orientation process. Moreover, this paper includes results how the artificial accelerated weathering influences surface properties of the unoriented and oriented i-PP films with the mineral fillers. Changes in the ultraviolet (UV) treated polymeric films were studied with attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and by measuring contact angles. The results revealed that photooxidation of i-PP was more effective in the presence of the fillers and depended on the type of the filler but not on its amount. Moreover, the oriented samples experienced more effective photooxidation compared with the unoriented ones. In all studied samples the same photoproducts were detected, suggesting the same route of polymer photooxidation with and without the filler. These polymeric films were produced for potential applications in the devices in which piezoelectric effect can be used.Polymers 2020, 12, 562 2 of 18 in their structures. This ordered charge arises from an unordered electric charge being in this material or implemented to the material during polarization. In the case of semi-crystalline polymers, the polar crystalline phase is oriented under a strong electric field at elevated temperature. The amorphous phase, also present in such polymers, maintains the polarization of molecular dipoles in the crystalline phase. Semi-crystalline poly(vinylidene fluoride) (PVDF) is the most known piezopolymer with its piezoelectric charge constant, d 33 about 20-28 pC/N [1-4]. The piezoelectric charge constant, d 33 , is the quantity which refers to the piezoelectric effect and is defined as the charged density generated upon applied stress. Generally, the higher d 33 value the better piezoelectric properties of a material [1,4].PVDF copolymers, polyamides, Parylene-C, liquid crystal polymers belong to the semi-crystalline polymers exhibiting piezoelectric properties [1,2].Amorphous polymers have to possess molecular dipoles in their structure. Heating the amorphous polymers above the glass transition temperature, T g , and applying a strong electric field orients the present molecular dipoles. Afterwards, lowering the temperature in the presence of the electric field makes the molecular dipoles frozen, and the material becomes polarized. The mobility of polymer chains is greater above T g and reduces below T g . The stiffness and brittleness are the characteristics of polymers below T g in a glassy state, while elasticity and softness are typical of polymers above T g in a rubbery state.Amorphous bulk polymers encompass polyimides and polyacrylonitrile [1,2]. Combination of piezoceramics and polymers results in the formation of polymer composites in which the piezoceramics particles are dispersed in the polymer matrix. The aim of such procedure is to obtain...

show abstract

Physical and mechanical properties of fly ash‐based geopolymer with disposable medical mask reinforcement

Zhang,

Li,

Shen

et al. 2023

J of Applied Polymer Sci

View full text Add to dashboard Cite

A tremendous amount of the nonbiodegradable microplastic waste has been generated after the outbreak of COVID‐19 by the widespread use of single‐use personal protective equipment, especially disposable medical masks (DMMs). This has caused harm to the health and safety of human beings and various organisms. Finding a way to properly deal with these single‐use medical wastes has become an urgent problem. In this paper, an innovative way was explored to use DMMs in geopolymer (GP). The physical properties, mechanical strength, and resistance to high temperatures (200–800°C) of the composites were investigated. The findings of the study revealed that DMMs had negligible influence on resistance to high temperatures, but showed a positive influence on enhancing the compressive and flexural strengths of GPs at ambient temperature. The optimum DMMs content was 0.4 wt%, at which the compressive and flexural strengths of the GP composites were enhanced by 5.8% and 22.68% compared with the pure GP, respectively. The same polypropylene (PP) fiber amount increased compressive and flexural strengths by 7.49% and 9.76%, respectively. This thus confirmed that DMMs can be sustainably utilized in green building materials, playing a role as PP fibers toughening and contributing to the effective management of waste plastics.

show abstract

A Comprehensive Study of the Polypropylene Fiber Reinforced Fly Ash Based Geopolymer

Cited by 127 publications

References 34 publications

Effect of Polypropylene Fiber on Properties of Alkali-Activated Slag Mortar

Effect of Polypropylene Fiber on Properties of Alkali-Activated Slag Mortar

Surface Studies of UV Irradiated Polypropylene Films Modified with Mineral Fillers Designed as Piezoelectric Materials

Physical and mechanical properties of fly ash‐based geopolymer with disposable medical mask reinforcement

Contact Info

Product

Resources

About