Durability and Microstructural Behavior of Nano Silica-Marble Dust Concrete

2022 ◽  
Vol 114 (1) ◽  
pp. 5-18
Author(s):  
V.S. Kashyap

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2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Gaurav Sancheti ◽  
Vikram Singh Kashyap ◽  
Jitendra Singh Yadav

Purpose The purpose of this study is to perform comprehensive investigation to assess the mechanical properties of nano-modified ternary cement concrete blend. Nano silica (NS) (1%, 2% and 3%) and waste marble dust powder (MD) (5%, 10% and 15%) was incorporated as a fractional substitution of cement in the concrete matrix. Design/methodology/approach In this experimental study, 10 cementitious blends were prepared and tested for compressive strength, flexural strength, splitting tensile strength and static modulus of elasticity. The microstructural characteristics of these blends were also explored using a scanning electron microscope along with energy dispersive spectroscopy and X-ray reflection. Findings The results indicate an enhancement in mechanical properties and refinement in pore structure due to improved pozzolanic activities of NS and the filling effect of MD. Originality/value To the best of the authors’ knowledge, no study has reported the mechanical and microstructural behavior of concrete containing marble and NS.


2021 ◽  
Vol 796 (1) ◽  
pp. 012022
Author(s):  
Vikram Singh Kashyap ◽  
Utkarsh Agrawal ◽  
Karanpreet Arora ◽  
Gaurav Sancheti

2020 ◽  
Vol 10 (1) ◽  
pp. 10-20 ◽  
Author(s):  
K. Nandhini ◽  
V. Ponmalar

This paper manifests the performance of self-compacting concrete (SCC) together with the addition of nanosilica as supplementary cementitious material. For this study, nano-silica in different proportions of 1, 2 and 3% was used. The M40 grade of SCC with a total of four mixes inclusive of control concrete was prepared. The fresh state workability of SCC was assessed by conducting the slump flow, L-box test, V-funnel test, Orimet and J-ring tests. Hardened concrete test like tensile strength was also carried out. The durability tests on permeability properties like water absorption, porosity, sorptivity, rapid chloride penetration and sulfate resistance test were determined at the age of 7, 28, 90 and 180 days. The tensile strength showed 18.82% greater strength for 2% nano-silica compared to the control mix. The permeability tests exhibited a decrease from 378 coulombs to 99 coulombs and showed advancement in SCC with nano-silica. The scanning electron microscope study was conducted on SCC samples to determine the microstructural behavior of nano-silica. A dense matrix with better development of calcium silicate gel was observed for 2% nano-silica.


Author(s):  
N. David Theodore ◽  
Donald Y.C Lie ◽  
J. H. Song ◽  
Peter Crozier

SiGe is being extensively investigated for use in heterojunction bipolar-transistors (HBT) and high-speed integrated circuits. The material offers adjustable bandgaps, improved carrier mobilities over Si homostructures, and compatibility with Si-based integrated-circuit manufacturing. SiGe HBT performance can be improved by increasing the base-doping or by widening the base link-region by ion implantation. A problem that arises however is that implantation can enhance strain-relaxation of SiGe/Si.Furthermore, once misfit or threading dislocations result, the defects can give rise to recombination-generation in depletion regions of semiconductor devices. It is of relevance therefore to study the damage and anneal behavior of implanted SiGe layers. The present study investigates the microstructural behavior of phosphorus implanted pseudomorphic metastable Si0.88Ge0.12 films on silicon, exposed to various anneals.Metastable pseudomorphic Si0.88Ge0.12 films were grown ~265 nm thick on a silicon wafer by molecular-beam epitaxy. Pieces of this wafer were then implanted at room temperature with 100 keV phosphorus ions to a dose of 1.5×1015 cm-2.


Author(s):  
Jia Lu ◽  
Xiaohou Shao ◽  
Chao Yin ◽  
Xinyu Mao ◽  
Long Wang ◽  
...  

GIS Business ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 158-165 ◽  
Author(s):  
Dr. Sarvesh PS Rajput

This study reported that the addition of nano-silica enhances the mechanical characteristics of concrete as its compressive, flexural and tensile split strengths are increased. As a comparison mixture to equate it along with nano-modified concrete, ordinary samples of Portland cement (OPC) have been utilized. Herein, upto 6.0 percent of OPC has been substituted by nanosilica. In fact, the introduction of nanosilica improves mechanical and microstructural characteristics of concrete by significantly (28 to 35%). The finding therefore, indicated that partly replacing OPC with up to 5 percent nanosilica increases the mechanical and microstructural properties cured up to ninety days as opposed to the standard OPC mix.


2002 ◽  
Vol 3 (3) ◽  
pp. 317-330
Author(s):  
Satish Chandra ◽  
Praveen Kumar ◽  
Berhanu Abesha Feyissa

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