The Effect of Latex and Chitosan Biopolymer on Concrete Properties and Performance

2011 ◽  
Vol 466 ◽  
pp. 37-46 ◽  
Author(s):  
Ulisses Targino Bezerra ◽  
Rui Miguel Ferreira ◽  
João Paulo Castro-Gomes
Keyword(s):  
Mechanical Properties ◽  
Polymer Fibers ◽  
Matrix Composites ◽  
Sem Images ◽  
Heterogeneous Distribution ◽  
Polymeric Additives ◽  
Fibre Pullout ◽  
Cause Of Failure ◽  
And Performance ◽  
Chitosan Biopolymer

this paper presents the results of a study in which the combination of two polymeric additives in concrete with the intention of improving its mechanical and durability performance is analysed. The additives are a synthetic latex and a biopolymer – chitosan. An evaluation of the mechanical properties as well as the phases formed based on scanning electron microscopy (SEM) and X-ray diffraction (XRD) was performed. The concretes were prepared with each of the polymers separately, and the results were ordinary. However, when combined, the results show an interesting interaction improving the mechanical strengths of the concrete. Several concrete samples were prepared with 0 – 4 % of each polymer with 1 % increments. The mechanical properties were shown to be sensitive to the incorporation of polymers. The desired effect of the interaction between the biopolymer and the latex was observed, because the strengths increased when both additives were present, namely for the combination of 2 % of each polymer. SEM images revealed a heterogeneous distribution in the polymer cementitious matrix, mainly with regards to latex. The presence of well defined polymer fibers on a fracture surface of composites prepared with biopolymer (4 %) was observed, indicating that the fibre pullout and not fracture was the cause of failure, resulting from the poor adherence of the fibers in matrix. Composites prepared with both polymers revealed abundant formation of C-S-H and the absence of ettringite, explaining the improvement of mechanical properties. The presence of reticulated structures of C-S-H dispersed in the microstructure and involving the calcium hydroxide corroborates the results of mechanical properties, mainly for the percentages of 3 % of biopolymer and 1 % of latex.

scholarly journals MECHANICAL PROPERTIES AND WEAR BEHAVIOUR OF KAOLINITE CLAY PARTICLES REINFORCED EPOXY MATRIX COMPOSITES

2021 ◽  
Vol 15 (2) ◽  
pp. 205-217
Author(s):  
O O. Daramola
Keyword(s):  
Mechanical Properties ◽  
Epoxy Matrix ◽  
Ultrafine Particles ◽  
Room Temperature ◽  
Structural Characteristics ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Sem Images ◽  
Kaolinite Clay ◽  
Clay Particles

Epoxy matrix composites reinforced with clay particles were developed by hand lay-up open mould casting technique. The clay used in this study was pulverized and processed into ultrafine particles through the sedimentation process. The composites were developed by blending the epoxy matrix and hardener with various weight fractions of the ultrafine clay particles (2, 4, 6, 8 and 10 wt%) in open test moulds. In order to accomplish a homogeneous blend of the constituents; manual mixing of the blend was carried out for 3 min. The test specimens were left to cure for 24 hours in the moulds and for additional 27 days at room temperature of 27 ± 2 °C and were thereafter detached from the moulds. The developed composites test specimens were subjected to mechanical tests (flexural, tensile and impact) in accordance with ASTM standards and performed at room temperature. Structural characteristics of the clay particles were determined with the aid of an X-ray diffractometer (XRD). The morphologies of the composites were determined using a scanning electron microscope (SEM). There was a progressive enhancement in the mechanical properties of epoxy composites containing 2-6 wt.% ultrafine clay particles while a drastic decrease in the mechanical properties was noticed in the epoxy/clay composites reinforced with 8-10 wt.% ultrafine clay particles. The SEM images revealed homogeneous particles distributions within the epoxy matrix at lower ultrafine clay particles weight fractions (2 wt. % and 6 wt.%).

scholarly journals Thermal Investigation of Aluminium – 11.8% Silicon (LM6) Reinforced SiO2-Particles

2011 ◽  
Vol 264-265 ◽  
pp. 620-625 ◽  
Author(s):  
Mohd Sayuti ◽  
S. Suraya ◽  
Shamsuddin Sulaiman ◽  
T.R. Vijayaram ◽  
Mohd Khairol A. Arifin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix ◽  
High Performance ◽  
Low Cost ◽  
Hardness Test ◽  
Weight Fraction ◽  
Matrix Composites ◽  
Casting Technique ◽  
And Performance ◽  
Commercial Applications

High performance automotive, aerospace, electronics and other industrial and commercial applications are finding tremendous advantages in using metal matrix composites. The reinforcement is very important because it determines the mechanical properties, cost and performance of a given composite. An excellent in mechanical properties, combined with the ease of formability and low cost makes the application of metal matrix composite of aluminium-11.8% silicon reinforced SiO2 to increase steadily. This paper investigates the interrelationships between thermal properties and reinforcement content, microstructure and hardness of LM6 reinforced SiO2 composites. Specimens were fabricated by casting technique for 5, 10, 15 and 20% weight fractions of SiO2 particulate and mesh of: 65 micron. The experimental results show that the thermal diffusivity and thermal conductivity decreases as SiO2 wt.% of the composite increases and under hardness test, it was found that the hardness value had increased gradually with the increased addition of quartz particulate by weight fraction percentage.

Effect of Weight Percentage on Mechanical Properties of Boron Carbide Particulate Reinforced Aluminium Matrix Composites

2014 ◽  
Vol 612 ◽  
pp. 151-155 ◽  
Author(s):  
S Dhinakaran ◽  
T.V. Moorthy
Keyword(s):  
Mechanical Properties ◽  
Stir Casting ◽  
Vital Role ◽  
Aluminium Matrix ◽  
Matrix Composites ◽  
Sem Images ◽  
Aluminium Matrix Composites ◽  
Weight Percentage ◽  
The Matrix ◽  
Particulate Reinforced

Aluminium matrix composites (AMCs) play a vital role as advanced engineering materials due to their excellent mechanical properties like light weight, strength, wear resistance, toughness. This work focuses on the fabrication of aluminium (AA6061) matrix composites reinforced with 3%, 6% and 9% B4C particle of 104μm using stir casting method. The wettability of B4C particles in the matrix has been improved by adding K2TiF6flux in to the molten metal. The microstructure and mechanical properties of the fabricated AMCs are analyzed. Uniform distribution of B4C particle in the matrix was confirmed using scanning electron microscope (SEM) images. It was found that the tensile strength and hardness of the fabricated AMCs increases with increased B4C particle content.

scholarly journals Effect of Rare Earth Metals (Y, La) and Refractory Metals (Mo, Ta, Re) to Improve the Mechanical Properties of W–Ni–Fe Alloy—A Review

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1660
Author(s):  
Senthilnathan Natarajan ◽  
Venkatachalam Gopalan ◽  
Raja Annamalai Arunjunai Rajan ◽  
Chun-Ping Jen
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Refractory Metals ◽  
Heavy Alloy ◽  
Significant Feature ◽  
Tungsten Heavy Alloy ◽  
Matrix Composites ◽  
Two Phase ◽  
And Performance ◽  
Strength And Ductility

Tungsten heavy alloys are two-phase metal matrix composites that include W–Ni–Fe and W–Ni–Cu. The significant feature of these alloys is their ability to acquire both strength and ductility. In order to improve the mechanical properties of the basic alloy and to limit or avoid the need for post-processing techniques, other elements are doped with the alloy and performance studies are carried out. This work focuses on the developments through the years in improving the performance of the classical tungsten heavy alloy of W–Ni–Fe through doping of other elements. The influence of the percentage addition of rare earth elements of yttrium, lanthanum, and their oxides and refractory metals such as rhenium, tantalum, and molybdenum on the mechanical properties of the heavy alloy is critically analyzed. Based on the microstructural and property evaluation, the effects of adding the elements at various proportions are discussed. The addition of molybdenum and rhenium to the heavy alloy gives good strength and ductility. The oxides of yttrium, when added in a small quantity, help to reduce the tungsten’s grain size and obtain good tensile and compressive strengths at high temperatures.

scholarly journals Design and Performance Research on Dual Layer Cement Based Absorber Reinforced with Graphene Nanosheets and Manganese-zinc Ferrite

2021 ◽  
Author(s):  
Yafei SUN ◽  
Tianshu ZHOU ◽  
Yueyue PENG ◽  
Hongwei LIU
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Zinc Ferrite ◽  
Graphene Nanosheets ◽  
Effective Bandwidth ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite ◽  
And Performance

Dual layer cement-based absorber is synthesized by mixing with graphene nanosheets and manganese-zinc ferrite, to study the effect of absorbing filler content on the mechanical properties, microstructure, electrical resistivity and reflectivity of the paste. The microstructure of the absorber is seen by Scanning Electron Microscope (SEM) images, Fourier Transform Infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD) curves of the absorber. The results show that graphene nanosheets significantly reduce the electrical resistivity of paste, increasing its mechanical properties by improving its pore structure. SEM images indicate that graphene nanosheets promote the increase and coarsening of cement hydration products and produce a large number of dense bulk crystals. Furthermore, reflectivity measurements show that the minimum reflectivity of – 14.1 dB is obtained in the range of 2 ~ 18 GHz and the effective bandwidth of 16 GHz is obtained when reflectivity is less than – 7 dB. This study provides a new method for the preparation of dual layer cement-based absorber.

scholarly journals Mechanical Properties of Metal Al/SiC and AlCu/SiC Metal Matrix Composites (MMCs)

2016 ◽  
Vol 1 ◽  
Author(s):  
Anggara B.S
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Tensile Test ◽  
Metal Matrix Composite ◽  
Metal Matrix ◽  
Frictional Resistance ◽  
Matrix Composites ◽  
Test Results ◽  
Sem Images ◽  
Sic Particle

<p>The Metal Matrix Composite (MMCs) Al/SiC and AlCu/SiC through steering hot method have been done. The SEM images show that there are microstructure differences between the Al/SiC and AlCu/SiC. Tensile test results show the value of the yield stress of AlCu /SiC higher than Al/SiC. Meanwhile, the testing of wear resistance during 50 minutes earned the mass lost on Al/SiC 4.7% while AlCu/SiC 7.32%. We believed that the addition SiC particle can improve the mechanical properties and reduces the frictional resistance.</p>

scholarly journals Mechanical Characterization of Aluminium-Silicon-Titanium Diboride (Al-Si-TiB2) Reinforced by Scandium (Sc) and Strontium (Sr)

2019 ◽  
Vol 7 (4.14) ◽  
pp. 392
Author(s):  
N. N.A. Basir ◽  
N. H. Mustafa ◽  
R. E. Ibrahim ◽  
R. Rosmamuhamadani ◽  
M. M. Mahat ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Titanium Diboride ◽  
High Strength ◽  
Matrix Composites ◽  
Composite Alloy ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
And Performance

Aluminium based metal matrix composites (MMCs) have better properties and performance. They are commonly used in transport applications which require combinations of high strength and ductility. They are quite attractive due to their low density, capability to be strengthened by precipitation, good corrosion resistance, high thermal and electrical conductivity. Grain refinement plays a crucial role in improving characteristics and properties of aluminium-silicon (Al-Si) alloy. In this investigation, scandium (Sc) and strontium (Sr) elements were added to aluminium-silicon-titanium diboride (Al-Si-TiB2) alloy for refinement of grains. The compositions of 93 wt.% Al-Si, 6 wt.% TiB2, 0.5 wt.% Sc and 0.5 wt.% Sr were melted into induction furnace. Then the composites have been characterized on the mechanical properties and microstructure characterization. Instron tensile machine and vickers hardness tester were used to characterize the mechanical properties of the composite alloy. Microstructure and phase composition were characterized by Field Emission Scanning Electron Microscope (FESEM) and X-ray Diffraction (XRD). From the results obtained, addition of Sc and Sr, into Al-S-TiB2 improved the tensile strength and hardness of composite alloy. Results also showed that the inoculants addition able to enhance the refinement of grains and escalate the values of hardness and tensile strength of Al-Si-TiB2 composite. Mechanical properties related much on the microstructure as it can be seen that the addition of grain refiners produced much higher value of mechanical properties.  

scholarly journals Mechanical Properties of Metal Al/SiC and AlCu/SiC Metal Matrix Composites (MMCs)

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Anggara B.S
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Tensile Test ◽  
Metal Matrix Composite ◽  
Metal Matrix ◽  
Frictional Resistance ◽  
Matrix Composites ◽  
Test Results ◽  
Sem Images ◽  
Sic Particle

<p>The Metal Matrix Composite (MMCs) Al/SiC and AlCu/SiC through steering hot method have been done. The SEM images show that there are microstructure differences between the Al/SiC and AlCu/SiC. Tensile test results show the value of the yield stress of AlCu /SiC higher than Al/SiC. Meanwhile, the testing of wear resistance during 50 minutes earned the mass lost on Al/SiC 4.7% while AlCu/SiC 7.32%. We believed that the addition SiC particle can improve the mechanical properties and reduces the frictional resistance.</p>

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