scholarly journals Proposed mathematical model for stress- strain behaviour of geopolymer concrete

2021 ◽  
Vol 309 ◽  
pp. 01053
Author(s):  
Bitla Srivathsav ◽  
N Prem Kumar ◽  
S Shrihari ◽  
C Vivek Kumar
Keyword(s):  
Mathematical Model ◽  
Flexural Behavior ◽  
Polymer Concrete ◽  
Geopolymer Concrete ◽  
Empirical Equations ◽  
Stress Strain ◽  
Strain Behaviour ◽  
Experimental Values ◽  
As Stress ◽  
Stress Block

In the present study, appropriate analytic stress-strain mathematical model is developed that can capture the real (observable) stress-strain behaviour of geo polymer concrete. The geo polymer concrete mixes have shown improved stress values for the same strain levels compared to that of controlled concrete mix in M20 grade. The analytical equations for the stress-strain response of conventional and geopolymer concrete mixes have been proposed in the form of y = Ax / (1+Bx+Cx2), both for ascending and descending portions of the curves with different set of values for constants. The proposed equations have shown good correlation with experimental values. The proposed empirical equations can be used as stress block in analyzing the flexural behavior of sections of controlled and geo polymer concrete. The stress-strain curves obtained in the experiment for M20 & G20 grades of controlled and geo polymer concrete exhibit a similar trend when compared to the empirical equations of modified Saenz model. So Saenz mathematical model is successfully evaluated and validated for geopolymer concrete.

scholarly journals A Review of mathematical models for prediction of Stress-strain and moment –curvature behaviour in concrete

2020 ◽  
Vol 184 ◽  
pp. 01111
Author(s):  
Y Shashank Babu ◽  
V Srinivasa Reddy ◽  
Raju S P V ◽  
M V Seshagiri Rao
Keyword(s):  
Mathematical Models ◽  
Strain Curve ◽  
Empirical Equations ◽  
Stress Strain ◽  
Conventional Concrete ◽  
Strain Behaviour ◽  
Experimental Values ◽  
Good Number ◽  
Made In

In this paper, a mathematical model for predicting the stress –strain and moment curvature relations in concrete is developed. A good number of empirical equations were proposed to represent stress-strain behaviour of conventional concrete. Most of the equations can be used for the ascending portion of the curve only. In 1997 Mansur et al. have adopted Carriera and Chu (1985) model, which was based on the model proposed by Popovics (1973). As such, model proposed by Mansur et al includes both ascending and descending portions of the stress-strain curve for the confined concrete with introduction of two constants for the descending portion of the curve. Several researchers proposed various empirical equations for stress-strain behaviour as briefly reported in the previous chapter. An attempt has been made in this study to develop mathematical models for concrete in unconfined state. These analytical equations can be applied to any concrete with slight modifications. These models are developed to validate the experimental values obtained.

scholarly journals Mathematical model for predicting stress-strain behavior of low calcium fly-ash based geopolymer concrete

2021 ◽  
Vol 309 ◽  
pp. 01103
Author(s):  
Nutakki Sai Ketana ◽  
V Srinivasa Reddy ◽  
M V Seshagiri Rao ◽  
S Shrihari
Keyword(s):  
Mathematical Model ◽  
Fly Ash ◽  
Liquid Solution ◽  
Polymer Concrete ◽  
Geopolymer Concrete ◽  
Stress Strain ◽  
Conventional Concrete ◽  
Strain Behavior ◽  
Low Calcium ◽  
Concrete Mix

The focus of the study was to identify the stress strain behavior of geo polymer concrete and salient parameters that influence the mixture proportions and the properties of low calcium fly ash- based geo polymers concrete. To develop geopolymer concrete the chemical proportions are alkaline liquid solution/fly-ash ratio=0.5, Sodium silicate/sodium hydroxide ratio=2.5,16M NaOH and SiO2/Na2O ratio=2.0. The geopolymer concrete mixes have shown improved stress values for the same strain levels compared to that of controlled concrete mix. Normalized stress strain curves are used to compare the behaviours of geopolymer concrete. It can be observed that geopolymer concrete has improved strains for the same stress when compared to conventional concrete. Geopolymer concrete mixes have shown improved stress values for the same strain levels compared to that of controlled concrete mixes.

scholarly journals An Experimental Investigation of the Stress-Strain Behaviour of Geopolymer Concrete

2018 ◽  
Vol 26 (2) ◽  
pp. 30-34 ◽  
Author(s):  
M. Venu ◽  
T. D. Gunneswara Rao
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Modulus Of Elasticity ◽  
Geopolymer Concrete ◽  
Test Results ◽  
Stress Strain ◽  
Curing Conditions ◽  
Strain Behaviour ◽  
Measured Stress

AbstractThis paper focuses on the mechanical properties and modulus of elasticity of fly ash and GGBS based geopolymer concrete. In this study an 8 molarity concentration of NaOH and alkaline liquid ratio in a ratio of 2.5 was used. This study includes the stress-strain behaviour along with the flexural strength, compressive strength and split tensile strengths for the GPC20, GPC40 and GPC60 grades. Tests were carried out on 150 mm × 150 mm × 150 mm cubes and 100 × 100 × 500 mm prisms and 150 × 300 mm cylindrical geopolymer concrete specimens. The test results not- ed the good mechanical properties and measured stress-strain relations of fly ash and GGBS based geopolymer concrete under ambient curing conditions. The elastic modulus was significantly varied with increases in the grade of the concrete. An equation was proposed to determine the modulus of elasticity based on the compressive strength of the geopolymer concrete.

Stress–strain behaviour of confined Geopolymer concrete

2014 ◽  
Vol 73 ◽  
pp. 326-331 ◽  
Author(s):  
N. Ganesan ◽  
Ruby Abraham ◽  
S. Deepa Raj ◽  
Divya Sasi
Keyword(s):  
Geopolymer Concrete ◽  
Stress Strain ◽  
Strain Behaviour

Experimental investigations on compressive, impact and prediction of stress-strain of fly ash-geopolymer and portland cement concrete

2020 ◽  
Vol 40 (7) ◽  
pp. 583-590
Author(s):  
Nagajothi S ◽  
Elavenil S
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Impact Resistance ◽  
Geopolymer Concrete ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Stress Strain ◽  
River Sand ◽  
Conventional Concrete ◽  
Strain Behaviour

AbstractThe recent technology of geopolymer concrete is a substitute material for ordinary portland cement concrete which is produced from the polycondensation reaction of aluminosilicate materials with alkaline activator solutions. The cost of river sand is high since the demand for the same is also high. Manufactured sand is used as a replacement material for river sand in geopolymer concrete. This paper mainly focuses to find the properties of fly ash (FA) – based geopolymer concrete under ambient cured temperature like compressive strength, stress strain behaviour, modulus of elasticity, Poission’s ratio and impact resistance. The result of geopolymer concrete is compared with ordinary portland cement concrete. The elasticity modulus and Poission’s ratio of geopolymer concrete are lower than conventional concrete. The Stress-strain behaviour of geopolymer concrete is similar to conventional concrete. The impact resistance of geopolymer concrete is very good when compared with conventional concrete.

Modelling and Simulation of NO2 Dispersion Phenomenon in Atmosphere by Analytical-Experimental Methods

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Delia Perju ◽  
Harieta Pirlea ◽  
Gabriela-Alina Brusturean ◽  
Dana Silaghi-Perju ◽  
Sorin Marinescu
Keyword(s):  
Mathematical Model ◽  
Nitrogen Dioxide ◽  
Modeling And Simulation ◽  
Human Health ◽  
Experimental Methods ◽  
Negative Effects ◽  
Real Situation ◽  
Experimental Values ◽  
The Mathematical Model

The European laws and recently the Romanian ones impose more and more strict norms to the large nitrogen dioxide polluters. They are obligated to continuously improve the installations and products so that they limit and reduce the nitrogen dioxide pollution, because it has negative effects on the human health and environment. In this paper are presented these researches made within a case study for the Timi�oara municipality, regarding the modeling and simulation of the nitrogen dioxide dispersion phenomenon coming from various sources in atmosphere with the help of analytical-experimental methods. The mathematical model resulting from these researches is accurately enough to describe the real situation. This was confirmed by comparing the results obtained based on the model with real experimental values.

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