scholarly journals Effect of Concrete Admixtures on Structural Properties and Corrosion Resistance of Steel Reinforcements

2021 ◽  
Author(s):  
Ali Dad CHANDIO ◽  
Shahid Hussain ABRO ◽  
Asif Ahmed SHAIKH ◽  
Haseeb AHMED ◽  
Baber FAROOQI ◽  
...  
Keyword(s):  
Structural Properties ◽  
Polypropylene Fibers ◽  
Curing Time ◽  
Remarkable Improvement ◽  
Structural Applications ◽  
Concrete Admixtures ◽  
Concrete Blocks ◽  
Corrosion Susceptibility ◽  
Variable Water ◽  
Control Corrosion

Concrete structural properties are compromised largely due to corrosion susceptibility of steel reinforcements. This results in weakening and eventual failure of structures. Several strategies have been employed in past to control corrosion and increase mechanical strength of concretes, in particular for structural applications. In this study, fly ash and polypropylene fibers were utilized as the admixtures for preparation of concrete blocks with variable water-cement (w/c) ratios i.e. 0.45, 0.5 and 0.65. Three different grades of cements were selected in this study namely OPC 43, OPC 53 and sulfate resistant one. Also, two different steel alloys were used i.e. ASTM-615 and ASTM-706, since both of them are very common reinforcement materials (rebars). The curing time of 56 consecutive days was employed before testing and characterization. The results suggest remarkable improvement in the mechanical properties of blocks upon the incorporation of admixtures. However, rebars exhibited highest corrosion rate in the presence of OPC 43 cement at w/c ratio of 0.65.

Nanomaterials and Nanocomposites Thermal and Mechanical Properties Modelling

2019 ◽  
pp. 234-256 ◽  
Author(s):  
Siddhartha Kosti
Keyword(s):  
Thermal Properties ◽  
Structural Properties ◽  
Base Material ◽  
High Strength ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Weight Percentage ◽  
Structural Applications ◽  
Glass Frp ◽  
Selection Of

This chapter deals with the modelling of nanomaterial and nanocomposite mechanical and thermal properties. Enrichment in the technology requires materials having higher thermal properties or higher structural properties. Nanomaterials and nanocomposites can serve this purpose accurately for aerospace or thermal applications and structural applications respectively. The thermal system requires materials having high thermal conductivity while structural system requires materials having high strength. Selection of the material for particular application is very critical and requires knowledge and experience. Al, Cu, TiO2, Al2O3, etc. are considered for thermal applications while epoxy-glass, FRP, etc. are considered for structural applications. Modelling of these nanomaterials and nanocomposites is done with the help of different mathematical models available in the literature. Results show that addition of the nanoparticle/composite in the base material can enhance the thermal and structural properties. Results also show that amount of weight percentage added also affects the properties.

Nanomaterials and Nanocomposites Thermal and Mechanical Properties Modelling

2021 ◽  
pp. 180-199
Author(s):  
Siddhartha Kosti
Keyword(s):  
Thermal Properties ◽  
Structural Properties ◽  
Base Material ◽  
High Strength ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Weight Percentage ◽  
Structural Applications ◽  
Glass Frp ◽  
Selection Of

This chapter deals with the modelling of nanomaterial and nanocomposite mechanical and thermal properties. Enrichment in the technology requires materials having higher thermal properties or higher structural properties. Nanomaterials and nanocomposites can serve this purpose accurately for aerospace or thermal applications and structural applications respectively. The thermal system requires materials having high thermal conductivity while structural system requires materials having high strength. Selection of the material for particular application is very critical and requires knowledge and experience. Al, Cu, TiO2, Al2O3, etc. are considered for thermal applications while epoxy-glass, FRP, etc. are considered for structural applications. Modelling of these nanomaterials and nanocomposites is done with the help of different mathematical models available in the literature. Results show that addition of the nanoparticle/composite in the base material can enhance the thermal and structural properties. Results also show that amount of weight percentage added also affects the properties.

scholarly journals Development of 3D needled composite from denim waste and polypropylene fibers for structural applications

2022 ◽  
Vol 314 ◽  
pp. 125583
Author(s):  
Shujuan Wang ◽  
Tao Zhang ◽  
Xiaolin Zhang ◽  
Shengbo Ge ◽  
Wei Fan
Keyword(s):  
Polypropylene Fibers ◽  
Structural Applications

Structural properties and superhydrophobicity of electrospun polypropylene fibers from solution and melt

Polymer ◽  
2010 ◽  
Vol 51 (25) ◽  
pp. 6005-6012 ◽  
Author(s):  
Daehwan Cho ◽  
Huajun Zhou ◽  
Youngjin Cho ◽  
Debra Audus ◽  
Yong Lak Joo
Keyword(s):  
Structural Properties ◽  
Polypropylene Fibers

scholarly journals Effect of Dispersed Reinforcement on Ultrasonic Pulse Velocity in Stabilized Soil

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6951
Author(s):  
Maciej Miturski ◽  
Wojciech Sas ◽  
Algirdas Radzevičius ◽  
Raimondas Šadzevičius ◽  
Rytis Skominas ◽  
...  
Keyword(s):  
Soil Stabilization ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Polypropylene Fibers ◽  
Water Tank ◽  
Curing Time ◽  
Soil Cement ◽  
Stabilized Soil ◽  
High Emission

One of the fundamental techniques for road subgrades is soil stabilization. Considering the high emission of carbon dioxide during the production of binders, novel techniques to reduce the binder are being studied. Thus, we investigated dispersed reinforcement in stabilized soils. A study was conducted to determine the ultrasonic pulse velocity in nine mixtures of soil, cement, and polypropylene fibers and then correlate the results with other destructive tests. The results show a decrease in wave velocity in mixes with fiber addition by up to 18.5%. The result is dependent on the curing time and whether the samples were stored in a water tank. Immersion in water increases the obtained results by about 6.3%. Based on the analysis, for mixtures with fibers, boundary velocities of waves above which lower values of modulus of elasticity were obtained were determined. Depending on the mix and the module analyzed, the limits range from 2194 m/s to 2498 m/s.

Sisal fiber reinforced hollow concrete blocks for structural applications: Testing and modeling

2017 ◽  
Vol 151 ◽  
pp. 98-112 ◽  
Author(s):  
Indara Soto Izquierdo ◽  
Orieta Soto Izquierdo ◽  
Marcio Antonio Ramalho ◽  
Alberto Taliercio
Keyword(s):  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Structural Applications ◽  
Concrete Blocks

scholarly journals PECULIARITIES OF STRUCTURAL PROPERTIES OF MASONRY FROM HOLLOW BLOCK UNITS AND THEIR ESTIMATION/MŪRO IŠ TUŠTYMĖTŲ BLOKELIŲ KONSTRUKCINIŲ SAVYBIŲ YPATUMAI IR JŲ ĮVERTINIMAS

2001 ◽  
Vol 7 (5) ◽  
pp. 386-390 ◽  
Author(s):  
Bronius Jonaitis ◽  
Gediminas Maršiukaitis ◽  
Vytautas Papinigis ◽  
Juozas Valivonis
Keyword(s):  
Structural Properties ◽  
Modulus Of Elasticity ◽  
Great Influence ◽  
Deformation Modulus ◽  
Horizontal Stress ◽  
Transverse Tensile ◽  
Concrete Blocks ◽  
Design Characteristics ◽  
Transverse Tensile Strength ◽  
Experimental Values

Performed analyses of investigations have shown that properties of masonry from hollow blocks depend on many factors, and on material type and shape of the blocks including. But there is no unified method for determining the main structural properties-the compressive strength and modulus of elasticity. Theoretical investigations into masonry from hollow blocks and analysis of character of failure have shown that horizontal stress due to vertical loads has great influence on the strength of such masonry. The failure is initiated by vertical cracks crossing transverse webs. Values of strengths of concentrically compressed masonry calculated according to codes [2, 3] lead to different deviations from experimental results. Lower deviations for masonry of blocks are obtained according to [2] than according to [3]. Strength of masonry of calcium silicate blocks calculated by [3] is greater than that determined by experiments. Modulus of elasticity of such type masonry is lower than that of the same strength masonry from concrete blocks. Different calculation methods give different values of deformation modulus. The best agreement with experimental values of modulus of elasticity is given by the calculation method [2]. For selection types of hollow blocks for masonry and determination of design characteristics it is recommended to take average values determined by operating codes [2, 3] and to evaluate influence of shape and size of hollows on transverse tensile strength of blocks.

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

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