Sooraj A.O. Nair
Arizona State University
Service lifeDisplacement (fluid)Ferrite (iron)Test methodDeposition (phase transition)Composite materialDiscrete element methodVolumetric flow rateLayer (object-oriented design)Die swellMartensiteStructure (mathematical logic)Materials scienceRheologyCorrosionShear stressProcess engineeringGeometryMaterial DesignToolboxRebarScale (ratio)ExtrusionCementitiousPortland cementCrevice corrosionParticle packingMaterial requirementsCritical examinationSteady stateProcess (engineering)3D printingNozzlePearliteVolume fractionMechanical engineeringQuenchingShear (sheet metal)Concrete slump testFly ashMicrostructureSlagPlastics extrusion
7Publications
4H-index
76Citations
Publications 7
Newest
#1Sooraj A.O. Nair (ASU: Arizona State University)H-Index: 4
#2Subhashree Panda (UM: University of Miami)
Last. Narayanan Neithalath (ASU: Arizona State University)H-Index: 45
view all 4 authors...
Abstract null null This study aims to relate print velocity to critical parameters extracted from a controlled ram extrusion test, towards a test method to expedite the selection of materials and process parameters for 3D-printing of cementitious materials. Higher print velocities, while aiding faster construction, results in a need for higher extrusion pressure, while lower velocities interfere with extrudate quality through effects such as water filtration. Steady-state pressures and dead-zone...
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#1Arnaud PerrotH-Index: 23
#2Alexandre Pierre (University of Paris)H-Index: 8
Last. Viktor MechtcherineH-Index: 50
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#1Sooraj A.O. Nair (ASU: Arizona State University)H-Index: 4
#2Subhashree Panda (ASU: Arizona State University)H-Index: 1
Last. Narayanan Neithalath (ASU: Arizona State University)H-Index: 45
view all 5 authors...
Abstract Extrusion pressure-displacement tests on cementitious pastes with multiple starting materials and differing particle packing, subjected to different extrusion geometries are reported. The steady state extrusion pressure (equivalent to extrusion yield stress) and the deadzone length (static zone of material buildup at die entry) are determined from the pressure-displacement response to characterize the extrudability and/or printability. A unique “geometric ratio” is used to account for t...
9 CitationsSource
#1Sooraj A.O. Nair (Indian Institute of Technology Madras)H-Index: 4
#2Radhakrishna G. Pillai (Indian Institute of Technology Madras)H-Index: 13
Abstract Quenched and Self-Tempered (QST) steel reinforcing bar (rebar, herein) is widely used in the reinforced concrete (RC) systems across the world. A typical QST steel rebar cross-section consists of a ductile ‘ferrite-pearlite’ (FP) core and a hard ‘tempered-martensite’ (TM) periphery. A good quality QST steel rebar is expected to have an FP core encircled by a uniformly thick, continuous, and concentric TM ring/phase. This study assessed the cross-sectional phase distribution (CSPD) of QS...
4 CitationsSource
#1Sooraj A.O. Nair (ASU: Arizona State University)H-Index: 4
#2Hussam Alghamdi (ASU: Arizona State University)H-Index: 8
Last. Narayanan Neithalath (ASU: Arizona State University)H-Index: 45
view all 6 authors...
22 CitationsSource
#1Hussam Alghamdi (ASU: Arizona State University)H-Index: 8
#2Sooraj A.O. Nair (ASU: Arizona State University)H-Index: 4
Last. Narayanan Neithalath (ASU: Arizona State University)H-Index: 45
view all 3 authors...
Abstract Material design of alkali activated fly ash-based binders for extrusion-based 3D printing, the rheological responses that are influential in ensuring printability, and the properties of such binders are discussed in this paper. Fly ash is supplemented with fine limestone, slag, or portland cement to provide adequate microstructural packing required for printability. The alkaline activators help reduce the yield stress and enhance the cohesiveness of the mixtures. Based on the measured s...
42 CitationsSource
#1Pu Yang (ASU: Arizona State University)H-Index: 5
#2Sooraj A.O. Nair (ASU: Arizona State University)H-Index: 4
Last. Narayanan Neithalath (ASU: Arizona State University)H-Index: 45
view all 3 authors...
This paper aims to model the extrusion-based 3D printing process of a plain ordinary Portland cement (OPC) paste using the discrete element method (DEM), and outlines the methodology adopted to evaluate the linkage between particle scale processes and extrusion process. A mini slump test is used to define the rheological model to be used in DEM, and extract the relevant parameters. They are then implemented in a scaled-down extrusion printing model to determine the influence of particle-scale ef...
3 CitationsSource