scholarly journals Experimental Study on the Mechanical Properties and Durability of High-Content Hybrid Fiber–Polymer Concrete

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6234
Author(s):  
Chaohua Zhao ◽  
Zhijian Yi ◽  
Weiwei Wu ◽  
Zhiwei Zhu ◽  
Yi Peng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Material Design ◽  
Polymer Concrete ◽  
Dense Layer ◽  
Hybrid Fiber ◽  
Sem Images ◽  
Cross Sectional ◽  
Fiber Concrete ◽  
Polymer Modified Concrete ◽  
Pavement Material

Polymer-modified concrete and fiber concrete are two excellent paving materials that improve the performance of some concrete, but the performance of single application material is still limited. In this paper, polymer-modified concrete with strong deformation and fiber concrete with obvious crack resistance and reinforcement effect were compounded by using the idea of composite material design so as to obtain a high-performance pavement material. The basic mechanical properties of high-content hybrid fiber–polymer-modified concrete, such as workability, compression, flexural resistance, and environmental durability (such as sulfate resistance) were studied by using the test regulations of cement concrete in China. The main results were as follows. (1) The hybrid fiber–polymer concrete displayed reliable working performance, high stiffness, and a modulus of elasticity as high as 35.93 GPa. (2) The hybrid fiber–polymer concrete had a compressive strength of 52.82 MPa, which was 31.2% higher than that of the plain C40 concrete (40.25 MPa); the strength of bending of the hybrid concrete was 11.51 MPa, 191.4% higher than that of the plain concrete (3.95 MPa). (3) The corrosion resistance value of the hybrid fiber–polymer concrete was 81.31%, indicating its adjustability to sulfate attack environments. (4) According to cross-sectional scanning electron microscope (SEM) images, the hybrid fiber–polymer concrete was seemingly more integrated with a dense layer of cementing substance on its surface along with fewer microholes and microcracks as when compared to the ordinary concrete. The research showed that hybrid fiber–polymer concrete had superior strength and environmental erosion resistance and was a pavement material with superior mechanical properties.

Enhancement on Mechanical Properties of Hybrid Concrete by Incorporating Fibers with Different Geometrical Dimensions

2011 ◽  
Vol 243-249 ◽  
pp. 5941-5945
Author(s):  
Ya Fang Zhang ◽  
Lin Li ◽  
Hao Liu
Keyword(s):  
Mechanical Properties ◽  
Numerical Modeling ◽  
Flexural Strength ◽  
Enhancement Effect ◽  
Polypropylene Fibers ◽  
Hybrid Fiber ◽  
Meso Level ◽  
Fiber Concrete ◽  
Geometrical Dimensions ◽  
Incorporation Ratio

With numerical modeling in meso level, impaction of incorporating polypropylene fibers with two different geometry dimensions on flexural strength and toughness of hybrid fiber concrete has been studied in this paper. Mechanism of such hybrid fiber reinforcement has also been analyzed. The results show that hybrid of fibers with different geometric dimensions would bring about synergy, thus fiber enhancement effect could be demonstrated. Furthermore, the closer the incorporation ratio of these two kinds fibers are to each other, the more evident the enhancement will be produced. The most optimized hybrid ratio is in between 2:1 and 1:1.

Study on Performance about Hybrid Fiber Concrete of Airport Pavement

2014 ◽  
Vol 1065-1069 ◽  
pp. 706-709 ◽  
Author(s):  
Xiao Jun Liu ◽  
Che Fei Zhu ◽  
Yong Gen Wu ◽  
Qing Tao Liu
Keyword(s):  
Mechanical Properties ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Orthogonal Experiment ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Hybrid Fiber ◽  
Airport Pavement ◽  
Fiber Concrete ◽  
Pavement Concrete

In order to meet the requirements of the use of aircraft, improve mechanical properties of pavement concrete, the steel fiber mixed basalt hybrid fiber reinforced concrete technical route was proposed, by using the method of orthogonal experiment, steel fiber with 1.2%,1.5%,1.8% these 3 volume fraction and basalt fiber in 0.05%,0.1%,0.15% these 3 volume fraction mixed, research the rules of its effect on the performance of airport pavement concrete.

scholarly journals Experimental Study on Mechanical Properties of High Performance Hybrid Fiber Concrete for Shaft Lining

2021 ◽  
Vol 11 (17) ◽  
pp. 7926
Author(s):  
Qian Zhang ◽  
Wenqing Zhang ◽  
Yu Fang ◽  
Yongjie Xu ◽  
Xianwen Huang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Reinforced Concrete ◽  
Reference Group ◽  
Splitting Tensile Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Fiber Concrete ◽  
Shaft Lining

In order to solve the problem of highly brittle shaft lining under dynamic loading, a combination of hybrid fiber concrete mixed with steel and polypropylene fiber is proposed to make shaft lining. C60, the concrete commonly used in shaft lining, was selected as the reference group. The static mechanical properties, dynamic mechanical properties, and crack failure characteristics of the hybrid fiber concrete were experimentally studied. The test results showed that compared to the reference group concrete, the compressive strength of the hybrid fiber-reinforced concrete did not significantly increase, but the splitting tensile strength increased by 60.4%. The split Hopkinson compression bar results showed that the optimal group peak stress and peak strain of the hybrid fiber concrete increased by 58.2% and 79.2%, respectively, and the dynamic toughness increased by 68.1%. The strain distribution before visible cracks was analyzed by the DIC technology. The results showed that the strain dispersion phenomenon of the fiber-reinforced concrete specimen was stronger than that of the reference group concrete. By comparing the crack failure forms of the specimens, it was found that compared to the reference group concrete, the fiber-reinforced concrete specimens showed the characteristics of continuous and slow ductile failure. The above results suggest that HFRC has significantly high dynamic splitting tensile strength and compressive deformation capacity, as well as a certain anti-disturbance effect. It is an excellent construction material for deep mines under complex working conditions.

Mechanical properties of hybrid vetiver/banana fiber mat reinforced vinyl ester composites

2020 ◽  
pp. 152808372093816 ◽  
Author(s):  
A Stalin ◽  
S Mothilal ◽  
V Vignesh ◽  
MR Sanjay ◽  
Suchart Siengchin
Keyword(s):  
Mechanical Properties ◽  
Double Layer ◽  
Vinyl Ester ◽  
Longitudinal Direction ◽  
Vital Role ◽  
Hybrid Fiber ◽  
Sem Images ◽  
Banana Fiber ◽  
Composite Properties ◽  
Layer Fiber

Green sustainable life and biofibers play a vital role in achieving eco-friendly environment and great opportunities for fabricating the products. This work focused on the effect of the hybrid mat as reinforcement in vetiver/banana fiber mat reinforced vinyl ester composites. Composites plates were fabricated at 45° and 90° directions in ten different combinations by the compression molding machine. The mechanical properties of composites plates were tested as per ASTM standard. The morphological behaviour of tested specimens were evaluated by SEM. The hybrid double-layer fiber mat composites in longitudinal direction exhibit optimum results in tensile and flexural properties. However, it is found that vetiver double-layer fiber mat composites at 90° direction, indicating better impact strength than a banana and hybrid fiber mat composites. SEM images provided that composite properties are dependent on interface bonding between the fibers and matrix.

Effects of Marble Waste on Properties of Polymer Concrete

2017 ◽  
Vol 21 ◽  
pp. 213-218 ◽  
Author(s):  
Marinela Barbuta ◽  
Adrian Alexandru Şerbănoiu ◽  
Costel Cadere ◽  
Catalina Mihaela Helepciuc
Keyword(s):  
Mechanical Properties ◽  
Epoxy Polymer ◽  
Polymer Concrete ◽  
Sem Images ◽  
Split Tensile Strength ◽  
Pollution Problem ◽  
Glass Marble ◽  
Slag Glass ◽  
Save Energy ◽  
Marble Waste

The quantities of wastes, generated in industry are increasing every year. Their utilization became a priority for solving pollution problem and save energy and resources. The wastes are investigated as materials for obtaining new concretes with different applications. Polymer concrete is a composite material, in which the aggregates of different sorts are bound together by a resin. As in the case of cement concrete, different types of wastes (slag, glass, marble, etc.) can replace the aggregates or they can be added in the concrete composition as filler (silica powder, fly ash, calcareous powder, etc). The use of wastes presents some advantages such as: obtaining of new products at lower prices, in some cases with improved properties; consuming of wastes helps to clean the environment; preservation of natural resources which are replaced by wastes; etc.In the experimental study, marble waste is used for obtaining epoxy polymer concrete. The effects of this type of waste on the mechanical properties of polymer concrete were investigated. Two types of concrete were prepared: one with powder of marble as addition and the other type with aggregates of marble waste. The mechanical properties (compressive strength, flexural strength, split tensile strength) were experimentally determined and compared with the characteristics of epoxy polymer concrete (considered as reference mix). The microstructure of polymer concrete with marble waste was analyzed by SEM images. The marble waste influenced the mechanical properties of epoxy polymer concrete. Higher values of mechanical properties were obtained when the marble was used as aggregates. As addition in epoxy polymer concrete, the dosage and finesse of marble had influenced the values of mechanical properties.

Influence of Processing on Mechanical Properties of Hydroxyapatite

2008 ◽  
Vol 396-398 ◽  
pp. 587-590
Author(s):  
Marize Varella de Oliveira ◽  
Magna Monteiro Schaerer ◽  
Robson Pacheco Pereira ◽  
Ieda Maria V. Caminha ◽  
Silvia R. A. Santos ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Processing Parameters ◽  
Molar Ratio ◽  
Micro Hardness ◽  
Sem Images ◽  
Cross Sectional ◽  
Load To Failure ◽  
Cylindrical Samples ◽  
Vickers Micro Hardness

In the present work, mechanical properties of a stoichiometric hydroxyapatite (HA), synthesized by hydrothermal method, with 1.66 Ca/P molar ratio are investigated as a function of the processing parameters. Cylindrical samples were processed by uniaxial compacting, followed by sintering, aiming to obtain high density HA samples. Density values were obtained by the geometric method and SEM images were taken from HA samples in order to characterize their topography and to determine the grain size for each set of samples. Vickers micro-hardness was measured for each set of samples. Compressive strength of cylindrical samples with 2.0 mean diameter/height ratio was measured reporting load to failure divided by the cross-sectional area of the samples. Vickers micro-hardness and compaction strength values of the samples were found to be in agreement with the relative density and grain size values.

scholarly journals Study of microstructure modification on La0.7Sr0.3Co0.2Fe0.8O3-δ (LSCF 7328) asymmetric flat membrane

2019 ◽  
Vol 15 (4) ◽  
pp. 498-503
Author(s):  
Silvana Dwi Nurherdiana ◽  
Naimatul Khoiroh ◽  
Ahyudia Malisa Ilham ◽  
Rendy Muhamad Iqbal ◽  
Wahyu Prasetyo Utomo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Average Pore Size ◽  
Morphological Evidence ◽  
Inversion Method ◽  
Dense Layer ◽  
Sem Images ◽  
Average Pore ◽  
Poly Ethylene ◽  
Morphology And Mechanical Properties

The LSCF 7328 (La0.7Sr0.3Co0.2Fe0.8O3-δ) asymmetric flat membranes were successfully prepared via a phase-inversion method followed by sintering at 1200 °C. In this study, a variety of poly(ethylene glycol) (PEGs) as the pore-forming agent, with  3 wt% composition and a wide ranges of molecular weight (Mw) (200 to 8000 Da) were used to tests its’ effect to the properties of LSCF  membranes. The results show that the PEGs, as additives, were able to modify the pore morphology and mechanical properties of the LSCF 7328 membrane. The morphological evidence from SEM images showed that the LSCF membranes have an asymmetric configuration, comprised of sponge-like and finger-like pores which are integrated with a dense layer. The variation in average pore size is clearly seen, starting from 13.00 to 135.33 μm, following the increase in PEGs molecular weight. The LSCF membranes which were prepared using PEG additive have higher hardness (1.2 – 13.6 Hv) than the membrane with no PEG  (0.2 Hv). In contrast, the porosity and pore volume of the membranes decrease with the increase of PEGs molecular weight. The decrease might be due to the formation of various closed macro-voids as the molecular weight of PEGs increases. Furthermore, the thermal expansion coefficient of the membrane with different PEGs molecular weight (ie. 400, 600, 4000 and 6000) Da posses no significant different, i.e. around 16 x 10-6 °C-1, although the membrane showed different morphology and mechanical properties.

Some Mechanical Properties of Polymer Modified Concrete by Adding Waste Iron Filings and Chips

2021 ◽  
Vol 895 ◽  
pp. 110-120
Author(s):  
Marwah Jaafar Kashkool ◽  
Wisam Abdulilah Almadi ◽  
Qusay A. Jabal ◽  
Layth Abdul Rasool Al Asadi ◽  
Jaber Kadhim Alghurabi
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Polymer Concrete ◽  
Fine Aggregate ◽  
Cement Ratio ◽  
Super Plasticizer ◽  
Polymer Modified Concrete

The study aims to improve some mechanical properties like compressive strength, tensile strength, modulus of elasticity and flexural strength of polymer modified concrete (PMC). This improving for PMC done by using waste iron filling as replacement from fine aggregate. waste iron filings and chips used in this research as percentages from sand ranged from 0 % to 40 % , the compressive strength of ordinary polymer concrete increase from 32.2 MPa to 41.81 MPa by 40% replacement of sand with waste iron filings and chips, tensile strength increased also from 2.83 MPa to 4.23 MPa by 40% replacement also. Flexural strength increased from 3.7 MPa for reference mix to about 7.1 MPa for mixes with 40% replacement, modulus of elasticity increased from 21087 MPa to 25233 MPa by using maximum percentage of waste iron filings. There is a slight increment in mechanical properties of polymer modified concrete after 30% ratio of waste iron filings and chips. Also research includes mixes modified with larger dosage of super plasticizer and less water/cement ratio to improve mechanical properties of PMC.

Effect of SWCNT Filler on Mechanical Properties and Electrical Conductivity of PVA/CS/GA/SWCNT Nanocomposite Thin Film

2020 ◽  
Vol 840 ◽  
pp. 441-447 ◽  
Author(s):  
Fitri Khoerunnisa ◽  
Esti Septiani ◽  
Hendrawan Hendrawan ◽  
Yaya Sonjaya
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Morphological Structure ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Cross Sectional ◽  
Conductive Thin Films

This study aims to investigate the effect of SWCNT nanofiller on mechanical properties and electrical conductivity of PVA/CS/GA nanocomposite film. Polyvinyl alcohol (PVA) and chitosan (CS) are used as polymer matrix that crosslinked by glutaraldehyde (GA). Nanofiller SWCNT was inserted in a polymer composite matrix at different composition. The thin films were characterized using FTIR (Fourier Transform Infrared Spectroscopy), XRD (X-ray diffraction), SEM (Scanning Electron Microscopy), TG/DTA (Thermal Gravimetric/Differential Thermal Analysis), sheet resistance, and tensile strength measurements. The results revealed that the addition of SWCNT notably increased the electrical conductivity of composite film from 1.2 x 10‒4 S.cm‒1 to 9 x10‒3 S cm‒1 as well as tensile strength and elongation 43 MPa to 62 MPa, 68% to 84%, respectively. The cross-sectional SEM images indicated that the conductive thin films have a layered structure where the insertion of SWCNT did not change their morphological structure significantly. Additionally, SWCNT improved the thermal stability of PVA/CS/GA nanocomposites thin film. These finding can be promising for the development of optoelectronic devices i.e. photovoltaic, emitting diodes, etc.

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