Connect with us

Material

Compressive strength development and durability properties of high volume slag and slag-fly ash blended concretes containing nano CaCO3

Publication date: Available online 6 January 2021

Source: Journal of Materials Research and Technology

Author(s): Anwar Hosan, Faiz Uddin Ahmed Shaikh

Republished by Plato

Published

on


Elsevier

Available online 6 January 2021

Journal of Materials Research and Technology

open access

Abstract

This paper presents the effect of nano-CaCO3 (NC) on the compressive strengths and durability properties of high volume slag (HVS) and high volume slag-fly ash (HVS-FA) blended concretes. The study examined the improvement in early and later age compressive strengths and durability properties such as sorptivity, volume of permeable voids, rapid chloride penetration and drying shrinkage of HVS concrete containing 69% blast furnace slag (BFS) and HVS-FA concrete containing combined BFS and fly ash (FA) content of 69% due to the addition of 1% NC. Results show that the addition of 1% NC improved the compressive strengths of HVS and HVS-FA concretes significantly by 43% and 28%, respectively at 3 days compared to the control HVS and HVS-FA concretes without NC and exceeded the compressive strengths of control OPC concrete at later ages. It is also found that 1% NC inclusion reduced the water sorptivity of HVS and HVS-FA concretes reasonably after 28 days of curing and reduction is greater after 90 days of curing exhibited comparable water sorptivity to OPC concrete. Significant improvement is also observed in reducing the volume of permeable voids and controlling the drying shrinkage strain at early age as well as later ages of both HVS and HVS-FA concretes due to 1% NC inclusion. Outstanding resistance against chloride ion penetration is also observed in HVS and HVS-FA concretes due to addition of 1% NC to the very low level of chloride ion penetration according to ASTM standard. SEM and EDS analysis revealed a denser microstructure of paste and interfacial transition zone (ITZ) around aggregates.

Keywords

High volume slag

high volume slag-fly ash blend

nano calcium carbonate

compressive strengths

durability properties

drying shrinkage

microstructure

© 2021 The Author(s). Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785421000016?dgcid=rss_sd_all

Material

Solar Light Irradiated Photocatalytic Activity of ZnO-NiO/rGO Nanocatalyst

Publication date: Available online 6 March 2021

Source: Journal of Materials Research and Technology

Author(s): Sheraz Yousaf, Sonia Zulfiqar, Muhammad Imran Din, Philips O. Agboola, Mohamed F. Aly Aboud, Muhammad Farooq Warsi, Imran Shakir

Republished by Plato

Published

on


Elsevier

Available online 6 March 2021

Journal of Materials Research and Technology

open access

Abstract

The current study is based on the synthesis and characterization of ZnO-NiO/rGO nanohybrid for photocatalytic degradation of organic pollutants. The physicochemical properties of synthesized products were estimated by x-rays diffraction technique (XRD), Fourier transforms infrared spectroscopy (FTIR), field emission-scanning electron microscopy (FE-SEM), and ultraviolet-Visible spectroscopy. The diffraction data showed the formation of binary metal oxide nanocomposite, containing ZnO in hexagonal whereas NiO in the cubic crystalline phase. XRD results revealed that the calculated crystallite size of NiO and ZnO in the ZnO-NiO nanocomposite was < 20 nm. The spectroscopic results were found in close agreement with XRD data. The morphological analysis exposed the nano-island morphology of the product. The solar light assisted photocatalytic degradation outcomes showed 89% degradation of methylene blue and 51% degradation of benzimidazole under similar conditions using ZnO-NiO/rGO nanohybrid. Moreover, the active species experiment showed that hydroxyl radicals, electrons, and holes were the main active species during the degradation mechanism. In contrast to the ZnO-NiO nanocomposite, the ZnO-NiO/rGO nanohybrid exhibited greater degradation efficiency. This superb photocatalytic performance of ZnO-NiO/rGO nanohybrid proved to be a durable candidate in the field of catalysis.

Keywords

Solar Light Irradiation

Photocatalyst

rGO

Nanohybrid

Degradation Efficiency

© 2021 The Author(s). Published by Elsevier B.V.

Checkout PrimeXBT
Trade with the Official CFD Partners of AC Milan
The Easiest Way to Way To Trade Crypto.
Check out Nord
Make your Money Grow with Mintos
Source: https://www.sciencedirect.com/science/article/pii/S2238785421002386?dgcid=rss_sd_all

Continue Reading

Material

Fracture prediction of powder metallurgical Fe-Cu-C steel at elevated temperatures via finite element-aided hot tensile tests

Publication date: Available online 5 March 2021

Source: Journal of Materials Research and Technology

Author(s): Qiang Li, Biao Guo, Xiao Li, Yu Zhang, Jie Jian, Jinqing Ao, Qifeng Tang, Yun Lu

Republished by Plato

Published

on

Elsevier

Available online 5 March 2021

Journal of Materials Research and Technology

open access

Abstract

Surface cracking induced by damage accumulation is a common quality problem during the hot processing of powder metallurgical (P/M) products. This study aims to clarify the damage and fracture of P/M Fe-Cu-C steel at elevated temperatures to propose its fracture criterion by combining hot tensile tests with finite element (FE) calculations. The results reveal that the FE-aided test accurately corrected the true stress and strain of the P/M steel during the Gleeble hot tensile testing. In addition, the flow behaviors and cracking tendency of the P/M steel strongly depended on the hot deformation parameters. The optimum hot processing window of P/M steel was proposed after determining the quantitative relationships between the damage and hot deformation parameters. Finally, a novel elevated temperature fracture strain model of the P/M steel was proposed based on the Zener–Hollomon parameter to construct its Cockroft and Latham fracture criterion coupling hot processing parameters. The constructed fracture criterion was further normalized and modified, and achieved an acceptable fracture predictive capability with a relative error of less than 5 %, which was validated by powder forging experiments. This work provides essential information and a useful model for the fracture prediction of P/M Fe-Cu-C steel at elevated temperatures, helping to manage the surface cracking problems of P/M steel during hot processing.

Keywords

powder metallurgy

hot processing

finite element-aided test

hot tensile

fracture prediction

© 2021 Published by Elsevier B.V.

Checkout PrimeXBT
Trade with the Official CFD Partners of AC Milan
The Easiest Way to Way To Trade Crypto.
Check out Nord
Make your Money Grow with Mintos
Source: https://www.sciencedirect.com/science/article/pii/S2238785421002349?dgcid=rss_sd_all

Continue Reading

Material

Microstructural study of the nano-scale martensitic lamellar α-Co and ε-Co phases of a Co-Cr alloy fabricated by selective laser melting

Publication date: Available online 6 March 2021

Source: Journal of Materials Research and Technology

Author(s): Hyung Giun Kim, Won Rae Kim, Hyun Woong Park, Gyung Bae Bang, Kyung-Hwan Jung, Yong Son, Sung Hwan Lim

Republished by Plato

Published

on

Elsevier

Available online 6 March 2021

Journal of Materials Research and Technology

open access

Abstract

An interfacial microstructural study was carried out to clarify the hardening mechanism of an as-built Co-Cr alloy fabricated by selective laser melting (SLM). Using transmission electron microscopy, we found a unique martensitic lamellar microstructure with a specific orientation relationship between the α-Co and ε-Co phases; specifically, a nanoscale microstructure consisting of (111)α-Co//(000

2¯

)ε-Co and [0

1¯

1]α-Co//[

1¯

2

1¯

0]ε-Co was formed on the Co-Cr alloy. The Co-Cr alloy fabricated by SLM with a martensitic microstructure achieved a Vickers hardness value of approximately 369.36 ± 11.86 HV without any secondary-phase particles such as carbides.

Keywords

Co-Cr alloy

Selective laser melting

Microstructure

Transmission electron microscopy

Orientation relationship

© 2021 Published by Elsevier B.V.

Checkout PrimeXBT
Trade with the Official CFD Partners of AC Milan
The Easiest Way to Way To Trade Crypto.
Check out Nord
Make your Money Grow with Mintos
Source: https://www.sciencedirect.com/science/article/pii/S2238785421002325?dgcid=rss_sd_all

Continue Reading
Heartland5 days ago

Why CBD is a Great Partner for Any Wellness Routine

Heartland4 days ago

Heartland4 days ago

CBD and Depression

Metal5 days ago

CISA mills’ daily steel output up 0.85% in late Feb after 3.49% rise in mid-Feb

Heartland5 days ago

Columbia Care Guides Higher For 2021

Metal4 days ago

India’s AMNS inks MoU with Odisha government for greenfield mill project

News5 days ago

CBD News: CBD giant Charlotte’s Web positions to enter THC market

News4 days ago

CBD News Roundup: CBD Leader Charlotte’s Web to Sell THC Products

Uncategorized5 days ago

Namaste Technologies Announces Appointment of New CFO

Metal5 days ago

Turkish coated coil prices surge amid good demand, limited allocation

Heartland5 days ago

Sudden rise in anxiety

Heartland5 days ago

Manufacturing4 days ago

Confused with these similar quotes from different companies. Could it be the same company? Am I being scammed in any way?

Uncategorized4 days ago

New Jersey Cultivation License: How to Apply

Heartland4 days ago

Durag and the Deertag Ep 37: Thanos Dust with Jay Simpson

Composites5 days ago

New postponement sees JEC World moved to 2022

Metal5 days ago

AISI calls on new US commerce secretary to maintain Section 232

Heartland5 days ago

CBDA: A Complete Introduction to Cannabidiolic Acid (CBDA)

Uncategorized19 hours ago

Can CBD Oil Help Treat Medical Conditions?

Metal5 days ago

Ex-China HDG offers rise further, better local market brings optimism

Heartland5 days ago

Cannabis Companies Go On Buying Spree

Material4 days ago

In situ deposition of NiO nano particles on cotton fabric using sol–gel method- photocatalytic activation properties

Manufacturing3 days ago

Why are warehouse break buzzers so expensive??

Uncategorized2 days ago

Cannabis Market Could Reach $90 Billion By 2026

Heartland4 days ago

Manufacturing4 days ago

Anyone seeing massive increases in tape and machine film?

Heartland4 days ago

Meet GABRIELLA

Heartland3 days ago

The Behavioral Sequelae of Cannabis Use in Healthy People: A Systematic Review

News3 days ago

New Research Finds Marijuana Use Not Associated With Hypertension

Heartland5 days ago

Trending

A Cloud Nine Capital Entity Copyright © 2020 – All Rights Reserved Proudly Made in America