scholarly journals Study on Flexural Behavior of Fly Ash based Reinforced Rectangular Geopolymer Concrete Slabs

2015 ◽  
Vol V4 (09) ◽  
Author(s):  
Mr Laxminarayan Naik ◽  
Prof Mahantesh N B ◽  
Dr Amarnath K ◽  
Keyword(s):  
Fly Ash ◽  
Flexural Behavior ◽  
Concrete Slabs ◽  
Geopolymer Concrete

scholarly journals A Review on Flexural Behavior of RCC Beams Made with Geopolymer Concrete

2020 ◽  
Vol 184 ◽  
pp. 01096
Author(s):  
Dr. T. Srinivas ◽  
S. V. Srinidhi ◽  
Dr. N.V. Ramana Rao
Keyword(s):  
Carbon Dioxide ◽  
Fly Ash ◽  
Flexural Behavior ◽  
Geopolymer Concrete ◽  
Major Drawback ◽  
Flexural Mode ◽  
Granulated Blast Furnace Slag ◽  
Life Threatening ◽  
And Control ◽  
Furnace Slag

In the process of production of concrete, the emission of carbon dioxide has become a life-threatening issue and a major drawback towards sustainable development, as there is need to reduce and control this carbon dioxide. It is therefore essential to find a substitute greener material to the existing OPC concrete. Since its significant minor carbon footprint and with usage of industrial by-products, which includes fly ash and ground granulated blast-furnace slag in geopolymer concrete is recognized as a sustainable substitutes. Fly ash is well-off in silicate and alumina, hence it reacts with alkaline solution to generate alumina silicate gel that binds the aggregate to manufacture a good quality concrete. Literature on the flexural behavior of geopolymer concrete (GPC) beams have been studied and compared with the reference concrete beams of the respective grade. From the literature, It has been observed that the development of flexural cracks are relatively less in geopolymer RCC beams compared to conventional beams, the failure occurred in the beams was in flexural mode and the cracks are generated from the tension zone to the compression zone and also the compressive strength greater than before due to decrease in porosity, as the fineness of fly ash enhanced.

scholarly journals Elevated Temperature Effects on the Behavior of One-Way Fi-brous Reinforced Concrete Slabs

2018 ◽  
Vol 7 (4.37) ◽  
pp. 179
Author(s):  
Dr. Mazin B. Abdul-Rahman ◽  
Dr. Alya'a A. Al-attar ◽  
Amenah M. Younus
Keyword(s):  
Reinforced Concrete ◽  
Elevated Temperature ◽  
Fly Ash ◽  
Volume Fraction ◽  
Steel Fibers ◽  
Flexural Behavior ◽  
Concrete Slabs ◽  
Static Loads ◽  
Reinforced Concrete Slabs ◽  
Rate Of Increase

In this research, the effect of elevated temperature on the flexural behavior of one-way reinforced concrete slabs under service static loads contain different volume fraction (0.25% , 0.75% and 1.25%) of steel fibers and different addition ratios (15%, 20% and 25%) of fly ash in addition to the reference slabs with not any additives  was studied. For this purpose, thirty cylinders (150 *300)mm , thirty prisms (100 * 100 * 500)mm and forty one-way slabs (900 * 350 * 70) mm were cast and tested. The one-way tested slabs were divided into two groups. The first group (of twenty slabs) were tested to determine the ultimate flexural strength under static loads at normal temperature. While the second group (of twenty slabs) were tested to determine the flexural behavior of slabs under static service loads at elevated temperature (using burning furnace). In this test, the samples are exposed to rising temperature reached 850℃. From these tests, the relationships between the load and  mid-span deflection as well as the relations between the  fire-time and mid-span deflection are measured. The results showed that the addition of steel fibers and fly ash particles will enhance the flexural behavior of concrete slabs. The highest increase in ultimate load compared to the reference slab was (28.31%) at the volume ratio 1.25% of the steel fibers and 25% of the fly ash at normal temperatures , And the rate of increase of the deflection with fire time was the lowest increase rate is 14.1% at the volume of 1.25% of steel fibers and the proportion of weight 20% of fly ash at high temperature. 

scholarly journals Effect of sugarcane bagasse fibre on the flexural behavior of geopolymer concrete RCC beams

2021 ◽  
Vol 309 ◽  
pp. 01113
Author(s):  
Srimanthula Chandana ◽  
T. Srinivas ◽  
N V Ramana Rao
Keyword(s):  
Fly Ash ◽  
Sugarcane Bagasse ◽  
Peak Load ◽  
Coal Industry ◽  
Flexural Behavior ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
Service Load ◽  
Sugarcane Bagasse Ash ◽  
Bagasse Fibre

CO2 is released into the atmosphere during the manufacture of Ordinary Portland Cement (OPC). Fly ash, a by-product of the coal industry, is used to replace OPC in concrete. It contains a lot of silicate gel and is mixed with an alkaline solution to make good concrete. Increased fly ash fineness improves compressive strength while lowering porosity. Advances in modern bio technology is possible freedoms for monetary use of agro-mechanical deposits like sugarcane bagasse ash and fibre. The flexural behaviour of Geopolymer Concrete RCC beams with and without sugarcane bagasse fibre, i.e. GPC and GPCF of G 40 grade, equal to M40, is presented in this study. The 150*150 mm beam is cast across a 1,200 mm effective span and tested for failure under static loads. The ultimate load and load displacement responses of GPC structural elements with and without fibre are measured and compared to normal GPC and conventional concrete elements. The findings suggest that SCBF improves the flexural strength, service load, and peak load of GPC elements.

THE EFFECT OF FLY ASH IN GEOPOLYMER CONCRETE POLES – A THRIVING SOLID WASTE DISPOSAL MEASURE FOR ECO-FRIENDLY ENVIRONMENT

2018 ◽  
Vol 8 (2) ◽  
pp. 7
Author(s):  
R. THENMOZHI ◽  
VADIVEL T.SENTHIL ◽  
S. MUTHURAMALINGAM ◽  
V. PADMAPRIYA ◽  
◽  
...  
Keyword(s):  
Fly Ash ◽  
Solid Waste ◽  
Waste Disposal ◽  
Geopolymer Concrete ◽  
Solid Waste Disposal

scholarly journals Practical Prediction Models of Tensile Strength and Reinforcement-Concrete Bond Strength of Low-Calcium Fly Ash Geopolymer Concrete

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 875
Author(s):  
Chenchen Luan ◽  
Qingyuan Wang ◽  
Fuhua Yang ◽  
Kuanyu Zhang ◽  
Nodir Utashev ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Fly Ash ◽  
Bond Strength ◽  
Prediction Models ◽  
Splitting Tensile Strength ◽  
Geopolymer Concrete ◽  
Structural Factors ◽  
Test Results ◽  
Portland Cement Concrete ◽  
Low Calcium

There have been a few attempts to develop prediction models of splitting tensile strength and reinforcement-concrete bond strength of FAGC (low-calcium fly ash geopolymer concrete), however, no model can be used as a design equation. Therefore, this paper aimed to provide practical prediction models. Using 115 test results for splitting tensile strength and 147 test results for bond strength from experiments and previous literature, considering the effect of size and shape on strength and structural factors on bond strength, this paper developed and verified updated prediction models and the 90% prediction intervals by regression analysis. The models can be used as design equations and applied for estimating the cracking behaviors and calculating the design anchorage length of reinforced FAGC beams. The strength models of PCC (Portland cement concrete) overestimate the splitting tensile strength and reinforcement-concrete bond strength of FAGC, so PCC’s models are not recommended as the design equations.

Influence of red mud on performance enhancement of fly ash-based geopolymer concrete

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Ramamohana Reddy Bellum ◽  
Chava Venkatesh ◽  
Sri Rama Chand Madduru
Keyword(s):  
Fly Ash ◽  
Red Mud ◽  
Performance Enhancement ◽  
Geopolymer Concrete

scholarly journals Behavior of Quarry Rock Dust, Fly Ash and Slag Based Geopolymer Concrete Columns Reinforced with Steel Fibers under Eccentric Loading

2021 ◽  
Vol 11 (15) ◽  
pp. 6740
Author(s):  
Rana Muhammad Waqas ◽  
Faheem Butt
Keyword(s):  
Fly Ash ◽  
Concrete Cover ◽  
Steel Fibers ◽  
Structural Behavior ◽  
Partial Replacement ◽  
Geopolymer Concrete ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
Source Materials ◽  
Rock Dust

Geopolymer concrete, also known as an earth-friendly concrete, has been under continuous study due to its environmental benefits and a sustainable alternative to conventional concrete construction. The supplies of many source materials, such as fly ash (FA) or slag (SG), to produce geopolymer concrete (GPC) may be limited; however, quarry rock dust (QRD) wastes (limestone, dolomite, or silica powders) formed by crushing rocks appear virtually endless. Although significant experimental research has been carried out on GPC, with a major focus on the mix design development, rheological, durability, and mechanical properties of the GPC mixes; still the information available on the structural behavior of GPC is rather limited. This has implications in extending GPC application from a laboratory-based technology to an at-site product. This study investigates the structural behavior of quarry-rock-dust-incorporated fiber-reinforced GPC columns under concentric and eccentric loading. In this study, a total of 20 columns with 200 mm square cross-section and 1000 mm height were tested. The FA and SG were used as source materials to produce GPC mixtures. The QRD was incorporated as a partial replacement (20%) of SG. The conventional concrete (CC) columns were prepared as the reference specimens. The effect of incorporating quarry rock dust as a replacement of SG, steel fibers, and loading conditions (concentric and eccentric loading) on the structural behavior of GPC columns were studied. The test results revealed that quarry rock dust is an adequate material that can be used as a source material in GPC to manufacture structural concrete members with satisfactory performance. The general performance of the GPC columns incorporating QRD (20%) is observed to be similar to that of GPC columns (without QRD) and CC columns. The addition of steel fibers considerably improves the loading capacity, ductility, and axial load–displacement behavior of the tested columns. The load capacities of fiber-reinforced GPC columns were about 5–7% greater in comparison to the CC columns. The spalling of concrete cover at failure was detected in all plain GPC columns, whereas the failure mode of all fiber-reinforced GPC columns is characterized with surface cracking leading to disintegration of concrete cover.

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