scholarly journals Cement-Based Materials Containing Graphene Oxide and Polyvinyl Alcohol Fiber: Mechanical Properties, Durability, and Microstructure

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 638 ◽  
Author(s):  
Wenguang Jiang ◽  
Xiangguo Li ◽  
Yang Lv ◽  
Mingkai Zhou ◽  
Zhuolin Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexural Strength ◽  
Polyvinyl Alcohol ◽  
Mechanical Strength ◽  
Mechanical Performance ◽  
Control Sample ◽  
Corrosion Condition ◽  
Cement Based Materials ◽  
Strength And Durability ◽  
Pva Fiber

The influence of graphene oxide (GO) and polyvinyl alcohol (PVA) fiber on the mechanical performance, durability, and microstructure of cement-based materials was investigated in this study. The results revealed that compared with a control sample, the mechanical strength and durability of cement-based materials were significantly improved by adding PVA fiber and GO. The compressive and flexural strength at 28 d were increased by 30.2% and 39.3%, respectively. The chloride migration coefficient at 28 d was reduced from 7.3 × 10−12 m2/s to 4.3 × 10−12 m2/s. Under a sulfate corrosion condition for 135 d, the compressive and flexural strength still showed a 13.9% and 12.3% gain, respectively. Furthermore, from the Mercury Intrusion Porosimetry (MIP) test, with the incorporation of GO, the cumulative porosity decreased from more than 0.13 cm3/g to about 0.03 cm3/g, and the proportion of large capillary pores reduced from around 80% to 30% and that of medium capillary pores increased from approximately 20% to 50%. Scanning electron microscope (SEM) images showed a significant amount of hydration products adhering to the surface of PVA fiber in the GO and PVA fiber modified sample. The addition of GO coupling with PVA fiber in cement-based materials could promote hydration of cement, refine the microstructure, and significantly improve mechanical strength and durability.

scholarly journals Mechanical properties and microstructure of recycled mortar reinforced with hybrid fiber

2018 ◽  
Vol 7 (4) ◽  
pp. 2178 ◽  
Author(s):  
Sallehan Ismail ◽  
Mohammad Asri Abd Hamid ◽  
Zaiton Yaacob ◽  
Dzulkarnaen Ismail ◽  
Hazizan Md Akil
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Mechanical Strength ◽  
Mechanical Performance ◽  
Volume Fraction ◽  
High Strength ◽  
Strength Properties ◽  
Recycled Aggregate ◽  
Hybrid Fiber ◽  
Hybrid Fibers

This study investigated the hybrid effects of two types of microfiber, namely, polypropylene and nylon, on the mechanical properties of high-strength mortar, which produced fine recycled aggregate (FRA). The amount of microfibers was maintained at a volumetric fraction of 0.6%. The microstructure and mechanical strength properties (compressive strength and flexural strength) of recycled mortar reinforced with hybrid-size microfibers were evaluated at various curing ages. Experimental results show that the inclusion of hybrid fibers significantly influenced the mechanical performance of the recycled mortar. The hybridization fiber at volume fraction 0.3% polypropylene + 0.3% nylon yielded the most promising mechanical performance. Enhancements of 8% on compressive and 11% flexural strength were achieved at 28 days. Scanning electron microscopy observations revealed that reinforcement at the microscale prohibited the initiation and growth of cracks at the micro level. High loads were required to form macrocracks within composites, thereby improving the mechanical strength of the mortar matrix.  

Experimental Study on Flexural Strength of Polyvinyl Alcohol (PVA) Fiber Reinforced Cementitious Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1013-1016 ◽  
Author(s):  
Shu Guang Liu ◽  
Cun He ◽  
Chang Wang Yan ◽  
Hai Jun Jiang
Keyword(s):  
Fly Ash ◽  
Flexural Strength ◽  
Polyvinyl Alcohol ◽  
Silica Fume ◽  
Volume Fraction ◽  
Cementitious Composites ◽  
Research Findings ◽  
Substitution Ratio ◽  
Pva Fiber ◽  
Fiber Reinforced Cementitious Composites

Flexural strength of cementitious composites containing polyvinyl alcohol (PVA) fiber, fly ash (FA) and silica fume (SF) is studied in this paper. The parameters studied include volume fraction of fiber, the substitution ratio of cement by fly ash and the substitution ratio of cement by both silica fume and fly ash, which have an influence on the compressive strength and flexural strength of cementitious composites. The research findings show that with the increase of volume fraction of fiber, the flexural strength of cementitious composites are improved .When the volume fraction of fiber rises from 0 to 2% ,the flexural strength increases by 51.8%. When the volume fraction of fiber remains 2%, cement substitution with fly ash reduces the flexural strength of cementitious Composites, while which is improved by cement substitution with both silica fume and fly ash.

scholarly journals Mechanical and Durability Properties of Lightweight Foamed Concrete Containing Palm Kernel Shell

2018 ◽  
Vol 7 (3.9) ◽  
pp. 65 ◽  
Author(s):  
Hanizam Awang ◽  
Adebayo Adeshina Dauda ◽  
Wenny Arminda
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Mechanical Strength ◽  
Mechanical Performance ◽  
Palm Kernel ◽  
Dry Density ◽  
Palm Kernel Shell ◽  
Durability Properties ◽  
Foamed Concrete ◽  
Strength And Durability

The research project aimed to investigate the effect of palm kernel shell (PKS) on the mechanical strength and durability of foamed concrete at the level of 10% to 60%. The samples were designed and prepared having a dry density of 1600 kg/m3with a binder to filler ratio of 1:1.2. Hardened foamed concrete samples were subjected to air cured and tested at the age of 7, 14, 28, 56 and 90 days. Mechanical performance of the PKS foamed concrete was assessed in term of its compressive strength. Durability properties namely water absorption and vacuum porosity were investigated. The result shows that the addition of PKS to lightweight foamed concrete up to 30% significantly improve the mechanical properties and the durability of the foamed concrete.  

scholarly journals Experimental Study on Fiber Reinforced Concrete Using PVA Fiber and Glass Powder

2021 ◽  
Vol 9 (8) ◽  
pp. 2707-2713
Author(s):  
Vrushabh K. Hulle
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Flexural Strength ◽  
Polyvinyl Alcohol ◽  
Glass Powder ◽  
Strength Test ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
Pva Fiber

Abstract: Concrete consisting of cement, water, fine and coarse aggregates are widely used in civil engineering constructions. Though making concrete is convenient and inexpensive, its brittle behavior upon tensile loading is one of its undesirable characteristics so that leads to the development of fiber reinforced concrete or engineered cementitious composites to improve this deficient. The Flexural strength of PVA (polyvinyl alcohol) FRC (fiber reinforced concrete) can be 150-200% greater than for normal concrete. According to Structural designers the damage tolerance and inherent tight crack width control of PVA FRC is found to be impressive in recent full-scale structural applications. If proper volume fractions are used the compressive strength PVA FRC can be similar to that of conventional concrete. The aim of this research work is to study compressive and tensile strength of FRC consisting PVA fiber & glass powder and studying the effect of glass powder in it. This research also gives rough idea on crack resistance capacity of FRC. In this paper we studied and provided detailed review on properties of PVA FRC with glass powder and experimentally identified the best ECC mix by analyzing the compressive & the flexural strength at different ratios like 0.5%, 1%, 1.5% of PVA fiber of total dry mix weight and in each case 15% of fine aggregate was replaced by glass powder. By conducting the compressive strength test and flexural strength test the maximum result we get at 28 days is 28.38Mpa and 8.95Mpa respectively which is more durable as compared to conventional concrete by IS 516:1959. So by analysis of results it can be seen that 1% mix is found to be optimum in all aspects. Keywords: PVA FRC, Polyvinyl Alcohol, Fibre Reinforced Concrete, Glass Powder.

Preparation for Graphene Coated Polyvinyl Alcohol Based Conductive Fiber Containing Silver Nanowires

2019 ◽  
Vol 807 ◽  
pp. 171-175
Author(s):  
Chao Xiao ◽  
Xi Ke Xiong ◽  
Jun Sun ◽  
Li Xing Dai
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Synergistic Effect ◽  
Polyvinyl Alcohol ◽  
Silver Nanowires ◽  
Chemical Reduction ◽  
Fiber Surface ◽  
Coated Fiber ◽  
Conductive Fiber ◽  
Pva Fiber

Graphene oxide (GO) coated fiber via deposition of GO sheets on polyvinyl alcohol (PVA) fiber containing silver nanowires (AgNWs) was fabricated, and chemical reduction for GO on the fiber surface was carried out to obtain reduced GO (rGO) coated PVA-AgNWs (rGO/PVA-AgNWs) fiber. The results showed that the rGO sheets were closely adhered on the surface of fiber, the electrical conductivity of the fiber increased with coating times of GO, and the conductivity was high up to 2.05×10-3 S/m when GO was coated 3 times on the fiber and reduced. The synergistic effect of rGO and AgNWs for the conductivity was also clearly indicated.

Study on the Practicability of PVA Porous Cement Concrete Pavement

2012 ◽  
Vol 450-451 ◽  
pp. 513-517
Author(s):  
Du La Man ◽  
Xiao Yu Hu
Keyword(s):  
Flexural Strength ◽  
Effective Porosity ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Porous Concrete ◽  
Concrete Aggregates ◽  
Bonding Performance ◽  
Cement Based Materials ◽  
Cement Concrete Pavement ◽  
Pva Fiber

In this study, Through the research of the porous concrete which have special structure,without sand and added PVA fibers form a fiber cement-based materials as the bonding materials of porous concrete. The results show that after mixed with quantitative PVA fibers, the bonding performance of the porous concrete aggregates can be enhanced, the flexural strength obviously improved, obtained the effective porosity and the best PVA fiber contents.

Impregnation of paper with cellulose nanofibrils and polyvinyl alcohol to enhance durability

2020 ◽  
Vol 35 (1) ◽  
pp. 106-114
Author(s):  
Hyeonji Park ◽  
Shin Young Park ◽  
Simyub Yook ◽  
Tae-Young Kim ◽  
Hye Jung Youn
Keyword(s):  
Polyvinyl Alcohol ◽  
Mechanical Strength ◽  
Shear Viscosity ◽  
Cellulose Nanofibrils ◽  
Control Sample ◽  
High Mechanical Strength ◽  
Base Paper ◽  
Low Shear Viscosity ◽  
Impregnation Solution ◽  
Low Shear

AbstractDurable papers should exhibit high mechanical strength and good soiling resistance. In this study, cellulose nanofibrils (CNF) was investigated as an additive to the polyvinyl alcohol (PVA) impregnation solution to improve the durability of paper. The impregnation suspensions were prepared by adding CNF to PVA solution in various ratios, and were used to impregnate a base paper. The PVA-CNF suspensions exhibited good dispersion stability; however, the low shear viscosity increased as its CNF content increased. The pickup weights of the papers impregnated with the PVA-CNF suspensions were found to be lower than those of the control sample, which were impregnated with the pure PVA solution only. Although the strength of the paper was not significantly improved by the addition of CNF, when the paper was impregnated with a PVA-CNF suspension containing 5 % CNF content, the product exhibited similar strength to the papers impregnated with only a 3 % PVA solution despite its lower pickup weight. The mechanical strength of the impregnated paper was affected by the pickup weight and penetration of the impregnating agent. The addition of a wet strengthening agent to the mixed suspensions was seen to enhance the wet soiling resistance of the papers.

Direct growth of thermally reduced graphene oxide on carbon fiber for enhanced mechanical strength

2020 ◽  
Vol 193 ◽  
pp. 108010
Author(s):  
Beom-Gon Cho ◽  
Shalik Ram Joshi ◽  
Jaekyo Lee ◽  
Young-Bin Park ◽  
Gun-Ho Kim
Keyword(s):  
Graphene Oxide ◽  
Carbon Fiber ◽  
Mechanical Strength ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
Direct Growth

scholarly journals Is Micro X-ray Computer Tomography a Suitable Non-Destructive Method for the Characterisation of Dental Materials?

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1271
Author(s):  
Andreas Koenig ◽  
Leonie Schmohl ◽  
Johannes Scheffler ◽  
Florian Fuchs ◽  
Michaela Schulz-Siegmund ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Computer Tomography ◽  
Mechanical Performance ◽  
Dental Materials ◽  
Three Dimensional ◽  
X Rays ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Multiple Measurements ◽  
High Doses

The aim of the study was to investigate the effect of X-rays used in micro X-ray computer tomography (µXCT) on the mechanical performance and microstructure of a variety of dental materials. Standardised bending beams (2 × 2 × 25 mm3) were forwarded to irradiation with an industrial tomograph. Using three-dimensional datasets, the porosity of the materials was quantified and flexural strength was investigated prior to and after irradiation. The thermal properties of irradiated and unirradiated materials were analysed and compared by means of differential scanning calorimetry (DSC). Single µXCT measurements led to a significant decrease in flexural strength of polycarbonate with acrylnitril-butadien-styrol (PC-ABS). No significant influence in flexural strength was identified for resin-based composites (RBCs), poly(methyl methacrylate) (PMMA), and zinc phosphate cement (HAR) after a single irradiation by measurement. However, DSC results suggest that changes in the microstructure of PMMA are possible with increasing radiation doses (multiple measurements, longer measurements, higher output power from the X-ray tube). In summary, it must be assumed that X-ray radiation during µXCT measurement at high doses can lead to changes in the structure and properties of certain polymers.

Sign in / Sign up

Export Citation Format

Share Document