scholarly journals Compressive Strength of Fly Ash Based Geopolymer Concrete Addition with Fibers

2020 ◽  
pp. 57-61
Author(s):  
B Anitha Rani V Bhargavi,
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Construction Material ◽  
Polypropylene Fibers ◽  
Geopolymer Concrete ◽  
Inorganic Polymers ◽  
Cement Production ◽  
Compressive Strength Test ◽  
New Generation ◽  
Day By Day

Concrete is the most widely used construction material all over the world. The quantity of the water plays an important role in the preparation of concrete. And the demand of concrete is increasing day by day and cement is used for satisfying the need of development of infrastructure facilities, 1 tonne cement production generates 1 tonne CO2, which adversely affect the environment. In order to reduce the use of OPC and CO2 generation, the new generation concrete has been developed such as Geopolymer concrete (GPC). Geopolymers are inorganic polymers and their chemical composition is similar to natural materials. Geopolymer binders are the alternatives in the development of acid resistant concrete i.e. durability of concrete. Geopolymer concrete is produced using Fly ash at 100% replacement to cement and binders like NaOH, Na2SiO3 to ignite the geopolymerisation. Many studies were carried out on properties of geopolymer concrete. This study focuses on enhancing the strength of geopolymer concrete by using fibers. 60% polyester and 40% polypropylene fibers are added to geopolymer concrete addition with Fly ash content. The trail mixes were casted with addition of fibers at different percentages like (0.20, 0.25, 0.30, 0.35, 0.40, 0.45 and 0.50 %). Then samples were air-cured for 28 days at ambient temperature. Compressive strength test is conducted on the samples after 3, 7 and 28 days. The optimum value is obtained at 0.40% addition of fibers when compared to nominal mix(GPC).

The Influence of Chloride Environment on Compressive Strength of Geopolymer Concrete with Fly Ash Using Taguchi Approach

2015 ◽  
Vol 754-755 ◽  
pp. 400-405 ◽  
Author(s):  
Ridho Bayuaji ◽  
Muhammad Sigit Darmawan ◽  
Boedi Wibowo ◽  
Nur Ahmad Husin ◽  
Srie Subekti ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Design Method ◽  
Construction Material ◽  
Strength Test ◽  
National Standard ◽  
Concrete Composition ◽  
Compressive Strength Test ◽  
Experimental Design Method ◽  
Chloride Environment

This study is conducted to determine the effect of four variables on compressive strength of geopolymer concretes. These four variables are binder/aggregate, Alkalinene/fly ash, effect of superplasticizer (SP) addition and curing system. The compressive strength is important mechanical properties for construction material. Taguchi experimental design method is used to compile the concrete composition of geopolymer to achieve the maximum compressive strength. Specimens concrete used is a cylinder with 100 mm diameter and 200 mm height. Compressive strength test is performed at 28 day using SNI 03-6825-2002, Indonesian National Standard. This study concludes that the chloride environment has a beneficial effect on the compressive strength of the concrete. In addition, the Alkalinene/fly ash ratio and binder/aggregate give a significant effect on the compressive strength of geopolymer concretes.

scholarly journals Compressive Strength of Geopolymer Concrete Composites: Modeling and Comprehensive Systematic Review

2021 ◽  
Author(s):  
Hemn Unis Ahmed ◽  
Azad A. Mohammed ◽  
Ahmed S. Mohammed
Keyword(s):  
Systematic Review ◽  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Alkaline Solution ◽  
Construction Material ◽  
Assessment Tools ◽  
Curing Temperature ◽  
Geopolymer Concrete

Abstract The growing concern about global climate change and its adverse impacts on societies is putting severe pressure on the construction industry as one of the largest producers of greenhouse gases. Given the environmental issues associated with cement production, geopolymer concrete has emerged as a sustainable construction material. Geopolymer concrete is cementless concrete that uses industrial or agro by-product ashes as the main binder instead of ordinary Portland cement; this leads to being an eco-efficient and environmentally friendly construction material. Compressive strength is one of the most important mechanical property for all types of concrete composites including geopolymer concrete, and it is affected by several parameters like an alkaline solution to binder ratio (l/b), fly ash (FA) content, SiO2/Al2O3 (Si/Al) of the FA, fine aggregate (F) and coarse aggregate (C) content, sodium hydroxide (SH) and sodium silicate (SS) content, ratio of sodium silicate to sodium hydroxide (SS/SH), molarity (M), curing temperature (T), curing duration (CD) inside the oven and specimen ages (A). In this regard, a comprehensive systematic review was carried out to show the effect of these different parameters on the compressive strength of the fly ash-based geopolymer concrete (FA-GPC). In addition, multi-scale models such as Artificial Neural Network (ANN), M5P-tree (M5P), Linear Regression (LR), and Multi-logistic Regression (MLR) models were developed to predict the compressive strength of FA-GPC composites. For the first time, in the modeling process, twelve effective parameters including l/b, FA, Si/Al, F, C, SH, SS, SS/SH, M, T, CD, and A were considered the modeling input parameters. Then, the efficiency of the developed models was assessed by various statistical assessment tools like Root Mean Squared Error (RMSE), Mean Absolute Error (MAE), Scatter Index (SI), OBJ value, and the Coefficient of determination (R2). Results show that the curing temperature, sodium silicate content, and ratio of the alkaline solution to the binder content are the most significant independent parameters that influence on the compressive strength of the FA-GPC, and the ANN model has better performance for predicting the compressive strength of FA-GPC in compared to the other developed models.

scholarly journals Effect of discontinuous curing and ambient temperature on the compressive strength development of fly ash based Geopolymer concrete

2018 ◽  
Vol 162 ◽  
pp. 02026 ◽  
Author(s):  
Bayrak Almuhsin ◽  
Tareq al-Attar ◽  
Qais Hasan
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Ambient Temperature ◽  
Rest Period ◽  
Positive Influence ◽  
Strength Test ◽  
Strength Development ◽  
Geopolymer Concrete ◽  
Compressive Strength Test ◽  
Compressive Strength Development

In the current study, 6 mixtures of Geopolymer concrete have been studied. The effect of discontinuous curing in oven and in atmosphere ambient temperature has been inspected by exposing the Geopolymer concrete specimens to temperature in the oven for few hours then stopping the oven to let it cool down to the ambient temperature. The compressive strength test of 100x200 mm cylindrical specimens for each mixture has been performed at different ages. It was found that the ambient temperature has vast effect on the compressive strength of the Geopolymer concrete in discontinuous curing. Discontinuous curing saves energy and can be a good replacement to the continuous curing when the ambient temperature is 40°C or more. Specimens that were cured continuously in ambient temperature of 43°C has resulted in compressive strength of 23 MPa at age of 40 days; to enhance the compressive strength, it is advised to impose few hours of discontinuous oven curing. It was also found that the rest period (starts when pouring concrete in forms and ends when imposing oven curing to the Geopolymer) has a positive influence on the compressive strength of Geopolymer concrete, but when no rest period is allowed, the later ages compressive strength is remarkably higher.

scholarly journals Comparative Study Involving Effect of Curing Regime on Elastic Modulus of Geopolymer Concrete

Buildings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 101 ◽  
Author(s):  
Peiman Azarsa ◽  
Rishi Gupta
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Fly Ash ◽  
Resonant Frequency ◽  
Construction Material ◽  
Bottom Ash ◽  
Geopolymer Concrete ◽  
Portland Cement Concrete ◽  
Steam Curing ◽  
Curing Regime

Geopolymer Concrete (GPC) as a cement-less construction material has attracted worldwide attention due to its lower carbon footprint. There are numerous studies reported on GPC made using different by-products including fly-ash. However, since the use of bottom-ash is comparatively limited, making potassium-based GPC using this waste can be an alternative to Portland Cement Concrete (PCC). In this study, two methods of accelerated curing were used to determine the influence of elevated temperature on the compressive strength of GPC, composed of 50% bottom-ash and 50% fly-ash. GPC specimens were cured using various temperatures including ambient, 30 °C, 45 °C, 60 °C, and 80 °C for 24 h, all followed by 28 days of ambient curing. The highest compressive strength was obtained with steam curing at a temperature of 80 °C for a duration of 24 h. It is of great significance to evaluate elastic modulus of the concrete mixture so that the short-term rigidity of structures subjected to elongation, bending, or compression can be predicted. In this study, a longitudinal Resonant Frequency Test (RFT) as a non-destructive test (NDT) was used to calculate the elastic modulus of both GPC and a comparative PCC mix. Based on the results, PCC had higher resonant frequency (by about 1000 Hz) compared to GPC. A review of empirical models for predicting GPC’s elastic modulus showed that all of the predicted elastic modulus values were lower than experimental values.

scholarly journals Compressive Strength of Sustainable Geopolymer Concrete Composites: A State-of-the-Art Review

2021 ◽  
Vol 13 (24) ◽  
pp. 13502
Author(s):  
Hemn Unis Ahmed ◽  
Azad A. Mohammed ◽  
Serwan Rafiq ◽  
Ahmed S. Mohammed ◽  
Amir Mosavi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Construction Material ◽  
Curing Temperature ◽  
Geopolymer Concrete ◽  
Palm Oil Fuel Ash ◽  
Silicate Content ◽  
Binder Ratio

The building industry, which emits a significant quantity of greenhouse gases, is under tremendous pressure due to global climate change and its consequences for communities. Given the environmental issues associated with cement production, geopolymer concrete has emerged as a sustainable construction material. Geopolymer concrete is an eco-friendly construction material that uses industrial or agricultural by-product ashes as the principal binder instead of Portland cement. Fly ash, ground granulated blast furnace slag, rice husk ash, metakaolin, and palm oil fuel ash were all employed as binders in geopolymer concrete, with fly ash being the most frequent. The most important engineering property for all types of concrete composites, including geopolymer concrete, is the compressive strength. It is influenced by different parameters such as the chemical composition of the binder materials, alkaline liquid to binder ratio, extra water content, superplasticizers dosages, binder content, fine and coarse aggregate content, sodium hydroxide and sodium silicate content, the ratio of sodium silicate to sodium hydroxide, the concentration of sodium hydroxide (molarity), curing temperature, curing durations inside oven, and specimen ages. In order to demonstrate the effects of these varied parameters on the compressive strength of the fly ash-based geopolymer concrete, a comprehensive dataset of 800 samples was gathered and analyzed. According to the findings, the curing temperature, sodium silicate content, and alkaline solution to binder ratio are the most significant independent parameters influencing the compressive strength of the fly ash-based geopolymer concrete (FA-BGPC) composites.

scholarly journals BETON BERMUTU DAN RAMAH LINGKUNGAN DENGAN MEMANFAATKAN LIMBAH ABU BAN BEKAS

2021 ◽  
Vol 2 (2) ◽  
pp. 141-149
Author(s):  
Johan Oberlyn Simanjuntak ◽  
Tiurma Elita Saragi ◽  
Ros Anita Sidabutar ◽  
Humisar Pasaribu ◽  
Rido Parulian Simbolon
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Construction Material ◽  
Fine Aggregate ◽  
Normal Concrete ◽  
Compressive Strength Test ◽  
Cement Additive ◽  
Long Time ◽  
Compressive Strength Of Concrete ◽  
Day By Day

The need for housing is increasing day by day. This is a factor in the visit to the need for concrete as a housing construction material. The more concrete that is produced, the more cement is needed for the construction. Concrete is a composite material (mixture) of several materials, the main ingredient of which consists of a mixture of cement, fine aggregate, coarse aggregate and water. Utilization of waste tire ash in the concrete mix is one of the alternative uses so that ic can ultimately increase the efficiency of cement savings which takes a long time to increase in high prices. With reference to this, this study uses used waste as a cement additive with a mixture composition of 0%, 3%, 6% and 9%. The test specimens were made using a cylinder with a diameter of 15 cm and a height of 40 cm with 48 specimens produced. The results of the compressive strength test of normal concrete (25.45 MPa), while the concrete with a mixture of 3% used tire ash (28.15 MPa), 6% used tire ash mixture (23.46 MPa) and 9% used tire ash mixture (18.60 MPa). From this research, it can be said that compressive strength of concrete using 3% ash produces the greatest compressive strength of 28.15 MPa.

scholarly journals Feasibility of Utilization of Industrial Polyurethane (PU) Rubber Waste in Geopolymer Concrete.

10.29007/2xq2 ◽  
2018 ◽  
Author(s):  
Jaydev Pandya ◽  
Siddharth Shah ◽  
Shemal Dave
Keyword(s):  
Fly Ash ◽  
Construction Material ◽  
Polymerization Process ◽  
Fine Aggregate ◽  
Geopolymer Concrete ◽  
Rubber Waste ◽  
Binding Material ◽  
Compressive Strength Test ◽  
Hard Polymer ◽  
Hardened State

Concrete being most widely used construction material across the world need to be sustainable. This study aims at feasibility study the effects of addition of PU rubber in geopolymer concrete for its strength. PU rubber is formed by polymerization process. A long and low crosslinking chain gives stretchy polymer and a short and high crosslinking chain gives hard polymer. High amounts of crosslinking give tough or rigid polymers. Geopolymer concrete includes an alternate material i.e Fly ash in replacement of cement, as a binding material . Fly ash reacts with the alkaline activated solution i.e mixture of Sodium Hydroxide (NaOH) and Sodium Silicate (Na2SiO3) forming a gel which binds the aggregates thoroughly. Cubes of size 150mm x 150mm x 150mm were casted and oven curing was done for 24 hour at 100°C. Compression test was performed in hardened state, for different proportions of replacing the aggregate with PU rubber i.e. 5%, 10%, 15%, 20%. Compressive strength test was performed at 7 & 28 days. Results were obtained and compared. Optimum mixes are Fly ash Coarse aggregate, Fine aggregate, Solution of NaOH and Na2SiO3 combined. Decrease in strength was observed at 7 & 28 days.

scholarly journals Studies on Mechanical properties of High Calcium Fly ash based sustainable Geopolymer concrete

2021 ◽  
Vol 2070 (1) ◽  
pp. 012184
Author(s):  
B Vijaya Prasad ◽  
N Anand ◽  
P D Arumairaj ◽  
M Sanath Kumar ◽  
T Dhilip ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Construction Material ◽  
Sustainable Construction ◽  
Geopolymer Concrete ◽  
Conventional Concrete ◽  
High Calcium ◽  
Major Interest ◽  
High Calcium Fly Ash

Abstract Geopolymer concrete (GPC) is a Sustainable construction material, in which cement is completely replaced by Fly ash as binder. To control emission of CO2 during the production of cement, it is advisable to use alternate sustainable Cementitious material. The development of GPC become a major interest to use for in-situ and precast applications. The present study aims to develop High calcium fly ash based GPC with aid of alkaline liquids such as sodium Hydroxide (NaOH) and Sodium silicate (Na2SiO3). Different molarities i.e 4M, 6M, 8M and 10M are used to develop the GPC under ambient and oven curing process. In the present investigation the Fresh properties of GPC and Mechanical properties such as compressive strength, Tensile strength, Flexural strength and Elastic modulus of GPC are investigated. An increase of alkaline activator in in the mix decreased the workability of GPC. The developed GPC mix of 8M is found to be the optimum for gain in compressive strength. A polynomial relationship is obtained for the mechanical properties of GPC developed under ambient and oven curing. The development cost of GPC can be reduced up to 11.25 to 16.5% as compared with conventional concrete grade of M25.

scholarly journals The Effect of Seawater on The Compressive Strength and Split Tensile Strength in Self Compacting Geopolymer Concrete

Jurnal CIVILA ◽  
2021 ◽  
Vol 6 (2) ◽  
pp. 197
Author(s):  
Herwina Rahayu Putri ◽  
Firman Paledung ◽  
Erniati Bachtiar ◽  
Popy Indrayani
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fly Ash ◽  
Room Temperature ◽  
Construction Material ◽  
Geopolymer Concrete ◽  
Split Tensile Strength ◽  
Coarse Aggregates ◽  
Binder Ratio

Fly ash is a kind of trash that may degrade the quality of the air. As a result, it is critical that it be used as an ecologically beneficial material. Although cement is the most often used construction material, its manufacturing generates carbon dioxide, which may degrade air quality. The aim of this research was to evaluate the compressive strength and split tensile strength of self-compacting geopolymer concrete (SCGC) cured in seawater, as well as to compare SCGC with and without saltwater. In this research, a cylindrical specimen with a diameter of 10 cm and a height of 20 cm was utilized as the specimen. Fly ash is used in proportion to fine and coarse aggregates at a ratio of 1: 0.65: 1.5. Using a 0.4 activator to binder ratio. The molarity ranges utilized were 11 M, 12 M, 13 M, 14 M, and 15 M. Compressive strength and split tensile strength tests were conducted on 28-day-old concrete. The findings indicated that when the molarity of SCGC treated with seawater increased from 11 to 15 M, the compressive and split tensile strengths increased. Compressive strength values were greatest in SCGC treated at room temperature when an activator of 13 M was used, and compressive strength values dropped in SCGC treated at room temperature when an activator greater than 13 M was used

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