Combined Corrosion Inhibitors and Mechanical Properties of Concrete Embedded Steel (AISI 316L) during Accelerated Saline Corrosion Test

The objective of this effort is to study the effect that the combination of fly ash (FA) with a liquid corrosion inhibitor has on the mechanical degradation of 316L rebars embedded in concrete specimens during salt fog testing for a period of four months, as well as the porosity of concrete. Partial replacement of Ordinary Portland Cement (OPC) by FA (0–25%) did not significantly affect the tensile properties of 316L except a small decrease in the elastic modulus and % elongation with FA increasing. Both FA and FA-liquid inhibitor combination resulted in significant reductions in the porosity of the reinforced concrete after 4 m of salt fog testing.

Download Full-text

Residual Stress Analysis in Deep Rolling Process on Gas Tungsten Arc Weld of Stainless Steel AISI 316L

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.880.23 ◽

2021 ◽

Vol 880 ◽

pp. 23-28

Author(s):

Warinthorn Thanakulwattana ◽

Wasawat Nakkiew

Keyword(s):

Residual Stress ◽

Stainless Steel ◽

Surface Layer ◽

Compressive Residual Stress ◽

Aisi 316L ◽

Deep Rolling ◽

Gas Tungsten Arc ◽

Steel Aisi ◽

Gas Tungsten ◽

Stainless Steel Aisi

Because of the general problem of the welding workpiece such as fatigue fracture caused by tensile residual stress lead to initial and propagation crack in the fusion zone. Thus, the mechanical surface treatment of deep rolling on Gas Tungsten Arc Welded (GTAW) surfaces of AISI 316L was studied. Deep rolling (DR) is a cold working process to induce compressive residual stress in the surface layer of the workpiece resulting in hardening deformation which increased surface hardness, and smooth surface that inhibit crack growth and improve fracture strength of materials. The present study focuses on compressive residual stress at the surface of stainless steel AISI 316L butt welded joint of GTAW. The three parameters of DR process were used; pressure 150 bar, rolling speed 400 mm/min, and step over 1.0 mm. The residual stresses analysis by X-ray diffraction with sin2Ψ method at 0, 5, 10, and 20 mm from the center of the welded bead. The results showed that the DR process on the welded of GTAW induce the minimum compressive residual stress-408.6 MPa and maximum-498.1 MPa in longitudinal direction. The results of transverse residual stress in minimum and maximum are 43.7 MPa and-34.8 MPa respectively. The FWHM of DR both longitudinal and transverse direction were increased in the same trend. Furthermore, the microhardness after DR treatment on workpiece surface layer higher than GTAW average 0.4 times.

Download Full-text

Characterisation of porosity, density, and microstructure of directed energy deposited stainless steel AISI 316L

Additive Manufacturing ◽

10.1016/j.addma.2018.11.014 ◽

2019 ◽

Vol 25 ◽

pp. 286-296 ◽

Cited By ~ 6

Author(s):

Zhi’En Eddie Tan ◽

John Hock Lye Pang ◽

Jacek Kaminski ◽

Helene Pepin

Keyword(s):

Stainless Steel ◽

Aisi 316L ◽

Steel Aisi ◽

Directed Energy ◽

Stainless Steel Aisi

Download Full-text

Partial Replacement of Cement by Neem Leaves Ash and Fly Ash

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.a1545.059120 ◽

2020 ◽

Vol 9 (1) ◽

pp. 506-508

Keyword(s):

Experimental Investigation ◽

Fly Ash ◽

Ordinary Portland Cement ◽

Construction Materials ◽

Strength Properties ◽

Vital Role ◽

Partial Replacement ◽

Cement Ratio ◽

Neem Leaves ◽

The World

Concrete is the most essential construction materials in all over the world. It is necessary to search the cheaply obtainable material as admixture which might be partially replaced cement in the production of concrete. This project is an experimental investigation of the neem leaves ash as partial replacement for cement also fly ash is used for partial replacement of cement. The neem leaves were dried, burnt and heated in the furnace to produce Neem leaves Ash, which was discovered to posses Pozzolanic properties.the ordinary Portland cement was replaced by neem ash by 5%,10%,15%,20% and 25% by weight also flash replaced by 15%,20%,25% and 30% the cubes were crushed to know the comparative strength of the concrete at different curing days. The last result showed that workability and strength properties of the concrete was depended on water cement ratio, total days of curing, the percentage of replacement of Neem leaves ash for OPC . I. This project it was noticed that the result of 5% NLA and 15% fly ash and 10% NLA and 20% of fly ash were gradually increasing the strength at 28 days. Neem leaves play a vital role and behaviour of Neem leaves ash and flash used concrete will be studied

Download Full-text

Utilization of Sugarcane Bagasse Ash from Power Co-generation Boilers as a Supplementary Cementitious Material

East African Journal of Science, Technology and Innovation ◽

10.37425/eajsti.v2i2.175 ◽

2021 ◽

Vol 2 (2) ◽

Author(s):

Safiki Ainomugisha ◽

Bisaso Edwin ◽

Bazairwe Annet

Keyword(s):

Compressive Strength ◽

Portland Cement ◽

Sugarcane Bagasse ◽

Low Income ◽

Ordinary Portland Cement ◽

Construction Material ◽

Sustainable Construction ◽

Partial Replacement ◽

Hardened Concrete ◽

Sugarcane Bagasse Ash

Concrete has been the world’s most consumed construction material, with over 10 billion tons of concrete annually. This is mainly due to its excellent mechanical and durability properties plus high mouldability. However, one of its major constituents; Ordinary Portland Cement is reported to be expensive and unaffordable by most low-income earners. Its production contributes about 5%–8% of global CO2 greenhouse emissions. This is most likely to increase exponentially with the demand of Ordinary Portland Cement estimated to rise by 200%, reaching 6000 million tons/year by 2050. Therefore, different countries are aiming at finding alternative sustainable construction materials that are more affordable and offer greener options reducing reliance on non-renewable sources. Therefore, this study aimed at assessing the possibility of utilizing sugarcane bagasse ash from co-generation in sugar factories as supplementary material in concrete. Physical and chemical properties of this sugarcane bagasse ash were obtained plus physical and mechanical properties of fresh and hardened concrete made with partial replacement of Ordinary Portland Cement. Cost-benefit analysis of concrete was also assessed. The study was carried using 63 concrete cubes of size 150cm3 with water absorption studied as per BS 1881-122; slump test to BS 1881-102; and compressive strength and density of concrete according to BS 1881-116. The cement binder was replaced with sugarcane bagasse ash 0%, 5%, 10%, 15%, 20%, 25% and 30% by proportion of weight. Results showed the bulk density of sugarcane bagasse ash at 474.33kg/m3, the specific gravity of 1.81, and 65% of bagasse ash has a particle size of less than 0.28mm. Chemically, sugarcane bagasse ash contained SiO2, Fe2O3, and Al2O3 at 63.59%, 3.39%, and 5.66% respectively. A 10% replacement of cement gave optimum compressive strength of 26.17MPa. This 10% replacement demonstrated a cost saving of 5.65% compared with conventional concrete.

Download Full-text

Quaternary blended cement mortars containing wood ash, glass and slag powders

Pollack Periodica ◽

10.1556/606.2021.00274 ◽

2021 ◽

Author(s):

Eethar Thanon Dawood ◽

Marwa Saadi Mhmood

Keyword(s):

Compressive Strength ◽

Portland Cement ◽

Ordinary Portland Cement ◽

Glass Powder ◽

Steel Slag ◽

Wood Ash ◽

Supplementary Cementitious Materials ◽

Partial Replacement ◽

Slag Powder ◽

Steel Slag Powder

AbstractA quaternary supplementary cementitious materials as partial replacement of ordinary Portland cement decreases CO2 emission. This paper has investigated the properties of mortars made from different quaternary blends of wood ash, steel slag powder and glass powder with ordinary Portland cement at different replacement levels of 0, 24, 25, and 30% by weight of the binder. The blended mortar mixtures tested for flow, compressive strength and density. The results showed that the flow of mortars is decreased with the combined use of steel slag powder, glass powder, and wood ash compared with control mix. Compressive strength reduced with the combination of steel slag powder, glass powder and wood ash but this reduction effects is acceptable especially at 24% replacement contain super-plasticizer compared with the ecological benefit.

Download Full-text

Dataset of the synthesis parameters to deposit YSZ on stainless steel AISI 316L by sputtering technique

Data in Brief ◽

10.1016/j.dib.2019.104480 ◽

2019 ◽

Vol 26 ◽

pp. 104480

Author(s):

Z.E. Sánchez-Hernández ◽

M.A. Domínguez-Crespo ◽

A.M. Torres-Huerta ◽

D. Palma-Ramírez ◽

E. Onofre-Bustamante ◽

...

Keyword(s):

Stainless Steel ◽

Aisi 316L ◽

Synthesis Parameters ◽

Steel Aisi ◽

Stainless Steel Aisi

Download Full-text

High Volume Slag and Slag-Fly Ash Blended Cement Pastes Containing Nano Silica

Materials Science Forum ◽

10.4028/www.scientific.net/msf.967.205 ◽

2019 ◽

Vol 967 ◽

pp. 205-213

Author(s):

Faiz U.A. Shaikh ◽

Anwar Hosan

Keyword(s):

Compressive Strength ◽

Fly Ash ◽

Cement Paste ◽

Ordinary Portland Cement ◽

Blended Cement ◽

High Volume ◽

Ash Content ◽

Partial Replacement ◽

Nano Silica ◽

Cement Pastes

This paper presents the effect of nanosilica (NS) on compressive strength and microstructure of cement paste containing high volume slag and high volume slag-fly ash blend as partial replacement of ordinary Portland cement (OPC). Results show that high volume slag (HVS) cement paste containing 60% slag exhibited about 4% higher compressive strength than control cement paste, while the HVS cement paste containing 70% slag maintained the similar compressive strength to control cement paste. However, about 9% and 37% reduction in compressive strength in HVS cement pastes is observed due to use of 80% and 90% slag, respectively. The high volume slag-fly ash (HVSFA) cement pastes containing total slag and fly ash content of 60% exhibited about 5%-16% higher compressive strength than control cement paste. However, significant reduction in compressive strength is observed in higher slag-fly ash blends with increasing in fly ash contents. Results also show that the addition of 1-4% NS improves the compressive strength of HVS cement paste containing 70% slag by about 9-24%. However, at higher slag contents of 80% and 90% this improvement is even higher e.g. 11-29% and 17-41%, respectively. The NS addition also improves the compressive strength by about 1-59% and 5-21% in high volume slag-fly ash cement pastes containing 21% fly ash+49%slag and 24% fly ash+56%slag, respectively. The thermogravimetric analysis (TGA) results confirm the reduction of calcium hydroxide (CH) in HVS/HVSFA pastes containing NS indicating the formation of additional calcium silicate hydrate (CSH) gels in the system. By combining slag, fly ash and NS in high volumes e.g. 70-80%, the carbon footprint of cement paste is reduced by 66-76% while maintains the similar compressive strength of control cement paste. Keywords: high volume slag, nanosilica, compressive strength, TGA, high volume slag-fly ash blend, CO2 emission.

Download Full-text