scholarly journals Experimental Analysis of Mechanical Properties and Durability of Cement-Based Composite with Carbon Nanotube

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yubing Du ◽  
Peiwei Gao ◽  
Jianming Yang ◽  
Feiting Shi ◽  
Mohammad Shabaz
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Catalytic Pyrolysis ◽  
Raw Materials ◽  
Resistance Index ◽  
Test Results ◽  
Durability Test ◽  
Longitudinal Comparison ◽  
And Diffusion ◽  
Average Compressive Strength

In order to study the mechanical properties and durability of cement-based composite with carbon nanotube, the test and analysis experiments are designed. Raw materials and related pharmaceutical instruments are prepared, to obtain cement-based composite with carbon nanotube samples by catalytic pyrolysis according to different proportions. The prepared sample is taken as the experimental object, and different bearing capacities are applied on different positions of the sample, to observe the change of the sample, and then, the experimental results of the mechanical properties of composite materials are obtained. The durability test results are obtained by combining the impermeability and frost resistance of the test object. The average compressive strength is 84.09 MPa, the average flexural strength is 16.9 MPa, and the crack resistance index is 22.5. In addition, the structure and diffusion coefficient of the sample also change in different degrees after the solution immersion and freeze-thaw treatment. Through longitudinal comparison, the more the carbon nanotubes are added into cement-based composite, the better its mechanical properties and durability are.

Effect of Surface Penetrating Sealer on the Microstructure Properties of Cement-Based Composites

2013 ◽  
Vol 651 ◽  
pp. 245-250
Author(s):  
Tasi Lung Weng ◽  
Wei Ting Lin
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Concrete Durability ◽  
Test Results ◽  
Chloride Permeability ◽  
Durability Test ◽  
Chloride Resistance ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Effect Of Surface

The effect of penetrating sealer on the structure of surface pore, mechanical properties, and durability of cement-based composites was studied. Concrete specimens with various water/cement ratios (w/c=0.35, 0.45, 0.55) were cast and treated surfaced with various amounts of penetrating sealer at different ages. The effect of penetrating sealer on the mechanical properties of concrete was assessed by compressive strength. And, the rapid chloride permeability was also explored to test concrete durability. Test results indicate that the application of penetrating sealer significantly improves concrete compressive strength and chloride resistance. By using scanning electron microscopes observation, the penetrating depth of penetrating sealer can be determined and is about 2 cm. The penetrating sealer in this study may be categorized as deep penetrating sealer.

scholarly journals Mechanical Properties of Polypropylene Macrofiber-Reinforced Concrete

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Zhishu Yao ◽  
Xiang Li ◽  
Cao Fu ◽  
Weipei Xue
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Raw Materials ◽  
Plain Concrete ◽  
Difficult Problem ◽  
Test Results ◽  
Mine Shaft ◽  
Technical Parameters ◽  
Geological Conditions ◽  
Lining Structure

To economically and reasonably solve the difficult problem of mine shaft support subject to complex geological conditions, we studied the mechanical properties of polypropylene macrofiber-reinforced concrete (PPMFRC). First, we selected test raw materials through an investigation and comparison of technical parameters. Second, using a preparation test, we obtained the composition of reference concrete of PPMFRC for the mine shaft lining structure, and test specimens were manufactured according to relevant test technical regulations. Finally, the mechanical properties of the specimens were compared, and the results show that the compressive, flexural, and tensile strengths of PPMFRC were increased by approximately 3%, 30%, and 20%, respectively, for mixtures with polypropylene macrofibers. The fracture toughness of PPMFRC was between 0.26 and 0.35, and the fracture energy was between 382.7 N/m and 485.6 N/m, which is significantly higher than that of plain concrete. The test results show that PPMFRC is an ideal material for the lining structure of a mine shaft under complex geological conditions, and we have provided technical parameters for engineering applications.

Exploring Possibilities of Implementation of Special Rutile Electrodes for Welding Microalloyed Steels

2016 ◽  
Vol 1138 ◽  
pp. 19-24
Author(s):  
Mihailo Mrdak ◽  
Nikola Bajić ◽  
Marko Rakin ◽  
Darko Veljić ◽  
Zoran Karastojković ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Microalloyed Steel ◽  
Raw Materials ◽  
Microalloyed Steels ◽  
Test Results ◽  
Medium Thickness ◽  
Cored Wire ◽  
Ni Content

The paper presents test results of a new quality of a special rutile electrode, with a core of flux-cored wire made from local raw materials, based on analyzing mechanical properties and microstructure of the weld metal in MMA welding. The base metal for experimental welding was microalloyed steel marked J55 (thickness 7.0 mm) according to API Spec 5L standards (EN 10113-3. and JUS C.B0 502) which was produced in Smederevo steelworks. For experimental welding a special electrode IHIS E 35 R-2 was used, with a medium thickness rutile coating, a core of flux-cored wire and Ni content of 2.5%. The results of the analyzes indicate that the new quality special rutile electrode with the flux-cored wire core provides good structural and mechanical properties of weld metal in microalloyed steel welded joints.

scholarly journals Impact of Length and Percent Dosage of Recycled Steel Fibers on the Mechanical Properties of Concrete

2021 ◽  
Vol 7 (10) ◽  
pp. 1650-1666
Author(s):  
Akhtar Gul ◽  
Bashir Alam ◽  
Muhammad Junaid Iqbal ◽  
Wisal Ahmed ◽  
Khan Shahzada ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Modulus Of Rupture ◽  
Test Results ◽  
Durability Test ◽  
Waste Tyres ◽  
Ultimate Load Carrying Capacity ◽  
Recycled Steel

The global rapid increase in waste tyres accumulation, as well as the looming social and environmental concerns, have become major threats in recent times. The use of Recycled Steel Fiber (RSF) extracted from waste tyres in fiber reinforced concrete can be of great profitable engineering applications however the choice of suitable length and volume fractions of RSF is presently the key challenge that requires research exploration. The present experimental work aims at investigating the influence of varying lengths (7.62 and 10.16 cm) and dosages (1, 1.5, 2, 2.5, 3, 3.5, and 4%) of RSF on the various mechanical properties and durability of concrete. Test results revealed that the varying lengths and dosages of RSF significantly affect the mechanical properties of concrete. The improvements in the compressive strength, splitting tensile strength, and Modulus of Rupture (MOR) of RSF reinforced concrete observed were about 26, 70, and 63%, respectively. Moreover, the RSF reinforced concrete showed an increase of about 20 and 15% in the yield load and ultimate load-carrying capacity, respectively. The durability test results showed a greater loss in compressive strength and modulus of elasticity and a smaller loss in concrete mass of SFRC. Based on the experimental findings of this study, the optimum dosages of RSF as 2.5 and 2% for the lengths 7.62 and 10.16 cm lengths, respectively are recommended for production of structural concrete. Doi: 10.28991/cej-2021-03091750 Full Text: PDF

scholarly journals THE INFLUENCE OF COMPOSITION OF CNT (CARBON NANOTUBE) ON THE PHYSICAL PROPERTIES OF BIOPLASTIC MADE FROM CASSAVA STARCH

2019 ◽  
Vol 20 (4) ◽  
pp. 174
Author(s):  
Masitoh Mangsur ◽  
Akbar Hanif Dawam Abdullah ◽  
Rahmat Firman Septiyanto ◽  
Yus Rama Denny Muchtar ◽  
Isriyanti Affifah
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Aspergillus Niger ◽  
Physical Properties ◽  
Functional Group ◽  
Morphological Characteristics ◽  
Cassava Starch ◽  
Test Results ◽  
Hot Press

Bioplastics are starch-based polymers that are easily degraded by microorganisms, so they can be used as an alternative to the use of conventional plastics. In this research, bioplastics made from cassava starch was made using glycerol as plasticizer and used MWCNTs (Multi-Wall CNTs) type CNT as reinforcement with variations in the composition of 0%, 1%, 2%, and 3%. Bioplastics are made with a dry method (dry blending) with stages of pre-mixing, mixing, hot press and cold press. Characteristics of bioplastic starch/CNT include tensile strength, biodegradation and morphological. The test results show that the addition of CNT composition affects the mechanical properties of bioplastics. The optimum value of tensile strength occurred in the addition of 2% CNT at 13.52 MPa. Biodegradable test results using the Aspergillus niger mushroom prove that bioplastic starch/CNT can be degraded well. The results of morphological characteristics in the form of SEM results showed that 3% bioplastic starch / CNT had cracks and resulted in decreased tensile strength. FTIR test results indicate the presence of a new functional group C≡C because of the addition of CNT.

scholarly journals Kajian Ketahanan Batuan Clay Shale Formasi Jatiluhur di Sentul City Jawa Barat

PROMINE ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 26-32
Author(s):  
Revia Oktaviani ◽  
Paulus P Raharjo ◽  
Imam A Sadisun
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Test Results ◽  
Durability Test ◽  
Indirect Contact ◽  
Water Research ◽  
Clay Shale ◽  
High Durability ◽  
Slake Durability Test ◽  
Over Time

The mechanical properties of Clay Shale are very unique. When it is dry, it shrinks and hardens, butwhen it absorbs water, it swells and to some extent loses its shear strength so that the drop-instrength can occur suddenly even with its own weight. Due to the nature of the swell-shrink that arestrongly influenced by climate and weather, clay shale durability may decrease over time when indirect contact with air and water. Research on clay shale was done in Sentul City, Bogor - West Java,Indonesia on Jatiluhur formation, using dynamic slaking (slake durability test) and slaking static test.Dynamic slacking test is done in three times i.e. after sampling, after 3 months and after 9 months.Slake durability test results from 3 different drilling points, shows that within 9 months, has not seenthe decreasing effect of durability. With a low Plasticity index, the durability research in Sentul City isin medium durability to medium-high durability classification.

scholarly journals Experimental Study on the Properties of Concrete Mixed with Iron Ore Tailings

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Zhong-xi Tian ◽  
Zeng-hui Zhao ◽  
Chun-quan Dai ◽  
Shu-jie Liu
Keyword(s):  
Mechanical Properties ◽  
Industrial Waste ◽  
Iron Ore ◽  
Raw Materials ◽  
Durability Test ◽  
Natural Sand ◽  
Optimal Amount ◽  
Compression Performance ◽  
Iron Ore Tailings ◽  
Carbonation Resistance

The objective of this study is to evaluate the modified performance of concrete with mixing of iron ore tailings in order to solve the shortage of natural sand and make full use of industrial waste. Firstly, the raw materials of mixing were analyzed, and the test ratio was determined. Secondly, the workability and mechanical property of concrete specimens with different amounts of iron ore tailings as replacement were tested. Results show that 35% replacement of natural aggregate by iron ore tailings is optimal. Finally, tests of impermeability, frost resistance, and carbonation resistance were further performed for the concrete specimens with optimal amount of iron ore tailings. The compression performance of the specimens after a durability test was determined. The change in the mechanical properties of the specimens was obtained after seepage, freezing-thawing, and carbonation. Findings showed that the performance of the concrete with 35% replacement of iron ore tailings is basically equivalent to that of natural sand concrete. Hence, it can be utilized in engineering applications.

scholarly journals Experimental Study on Mechanical Properties of Concrete in the Complex Environment of China-Laos (Moding-Vientiane) Railway

2020 ◽  
Author(s):  
Youhao Zhang ◽  
Wenqi Hou ◽  
Jihong Xi
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Raw Materials ◽  
Test Results ◽  
Railway Bridges ◽  
Mix Proportion ◽  
Concrete Mix ◽  
Engineering Environment ◽  
Complex Engineering ◽  
Made In China

In order to make different strength grades of concrete which meet the requirements of the complex engineering environment of China-Laos (Moding-Vientiane) Railway, the raw materials such as cement fabricated in Laos and water reducing agent made in China were chosen, the effect rules of size and the effect rules of different fly ash contents on the mechanical properties of C55 concrete were studied through the concrete mix proportion design and the mechanical property tests of different strength index. And the concrete mix proportion of C20∼C60 was determined. The results showed that the concrete which meet the requirements of China railway standards (TB10424-2010) can be configured according to the mix proportion in this paper. In the case of the additive is fly ash only, the appropriate content of fly ash in C55 concrete for China-Laos (Moding-Vientiane) Railway bridges was determined to be 15%. The test results in this paper had been successfully applied to the concrete construction of real bridges.

The Influence of Alkali Activator Concentration to Mechanical Properties of Geopolymer Concrete with Trass as a Filler

2014 ◽  
Vol 803 ◽  
pp. 125-134 ◽  
Author(s):  
Puput Risdanareni ◽  
Januarti Jaya Ekaputri ◽  
Triwulan
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Raw Materials ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Activator Concentration ◽  
Compressive Test ◽  
Volcanic Material ◽  
Alkali Activator ◽  
Factors Influencing

This paper describes one of the varying factors influencing the mechanical properties of geopolymer concrete. Fly ash and volcanic material called trass was used as raw materials, while sodium Hydroxide (NaOH) and Sodium silicate (Na2SiO3) was applied as an alkali activator. Mechanical properties were assessed by compressive test, the concentration of NaOH used in this study was eight and ten Molars, and ratio of Na2SiO3to NaOH by mass was 0.5, 1, 1.5, 2, and 2.5. Test results indicated that the strength of geopolymer concrete and binder were hardly influenced by concentration of NaOH in solution and the activator ratio. Binder with activator ratio of 2.5 has the highest compressive strength both in 8M and 10M NaOH system. However, in concrete, there are a few difference, concretes made with 8M NaOH and activators ratio of 2 have the highest compressive strength. This result might due to the low workability of fresh geopolymer concrete. On the other hand, binder and concrete made with 10M NaOH, showed the highest compressive strength when they were made with the activator ratio of 2,5.

Sunlight exposure: the effects on the performance of paragliding fabric

2018 ◽  
Vol 69 (05) ◽  
pp. 381-389
Author(s):  
MENGÜÇ GAMZE SÜPÜREN ◽  
TEMEL EMRAH ◽  
BOZDOĞAN FARUK
Keyword(s):  
Mechanical Properties ◽  
Aging Process ◽  
Air Permeability ◽  
Sunlight Exposure ◽  
Test Results ◽  
Coating Materials ◽  
Strength Tests ◽  
Before And After ◽  
The Relationship ◽  
Dark Blue

This study was designed to explore the relationship between sunlight exposure and the mechanical properties of paragliding fabrics which have different colors, densities, yarn counts, and coating materials. This study exposed 5 different colors of paragliding fabrics (red, turquoise, dark blue, orange, and white) to intense sunlight for 150 hours during the summer from 9:00 a.m. to 3:00 p.m. for 5 days a week for 5 weeks. Before and after the UV radiation aging process, the air permeability, tensile strength, tear strength, and bursting strength tests were performed. Test results were also evaluated using statistical methods. According to the results, the fading of the turquoise fabric was found to be the highest among the studied fabrics. It was determined that there is a significant decrease in the mechanical properties of the fabrics after sunlight exposure. After aging, the fabrics become considerably weaker in the case of mechanical properties due to the degradation in both the dyestuff and macromolecular structure of the fiber

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