Performance of Fly Ash and GGBS Based Geopolymer Concrete in Acid Environment Performance of Fly Ash and GGBS Based Geopolymer Concrete in Acid Environment (original) (raw)
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Performance of Fly Ash and GGBS Based Geopolymer Concrete in Acid Environment
Geopolymer concrete (GPC) is becoming a sustainable concrete when comparing to ordinary Portland cement (OPC) concrete. This investigation is mainly focused on performance of fly ash (FA) and ground granulated blast furnace slag (GGBS) based GPC in acid environment. The compressive strength, weight and ultrasonic pulse velocity (UPV) values of GPC mixes (FA100-GGBS0; FA50-GGBS50; FA0-GGBS100) were determined after 28 days of immersion in 3% sulphuric acid (H 2 SO 4). In this study, sodium silicate (Na 2 SiO 3) and sodium hydroxide (NaOH) solution is used as alkaline activator. Specimens were cast and cured for different curing periods at ambient room temperature and then studied the performance of GPC in acid environment. Test results revealed that the increased level of GGBS increased the compressive strength and ultrasonic pulse velocity values of GPC at all curing periods. The percentage of reduction in weight, compressive strength and pulse velocity values is decreased with the increased replacement of GGBS.
Experimental Study on Geopolymer Concrete with Replacement of Fly ASH and GGBS
IJRASET, 2021
In Twenty First century infrastructure development concrete has come out as the dominant construction material due to its longevity and strength. The main component used in the concrete preparation is ordinary Portland cement whose production release large amount of carbon dioxide into atmosphere that causes greenhouse effects. Various surveys suggest industries around the globe contribute about 6%of carbon dioxide that is releasing into the atmosphere. In spite of this major environmental concern, we cannot reduce the use of ordinary Portland cement for making concrete. In this study concrete is prepared by using geopolymer technology i.e. by mixing fly ash, ground granulated blast furnace slag, sodium silicates, sodium hydroxide are mixed. Specimen curing is done at regular intervals of 3 days, 7days, and 28days. Compressive, split and flexural strength obtained after 3 days, 7 days and 28 days. Acid, Sulphate test and permeability test done for 14 and 28 days of curing the specimen. More strength occurred at mix 5 of fly ash 30% and GGBS 70%.
Strength studies on geopolymer concrete with GGBS and Fly ash
IOP Conference Series: Materials Science and Engineering, 2020
Geopolymer concrete is a pollution controlled and eco-friendly alternate material used for construction in the recent years. This concrete has many advantages and applications. The main aim of this study is to check the effect of Fly ash and Ground Granulated Blast Furnace Slag (GGBS) on the mechanical properties of Geopolymer concrete at different replacement levels of GGBS by fly ash from 0 to 25% with 5% variation. From previous researches on Geopolymer concrete, an optimized mix is identified for testing mechanical behaviour. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) of 12 Molarity is used as activator solution in the ratio of 1:2.5. A carboxylic based admixture called La Hypercrete S25 is added in the mix by 1% of the weight of GGBS for increasing the workability of Geopolymer concrete. Cubes of 100mm size are cast for determining the compression strength behavior. Cylinders of 100mm dia and 200mm height are cast for splitting tensile strength and beams of size 500m...
STRENGTH PROPERTIES OF FLY ASH AND GGBS BASED GEO POLYMER CONCRETE
The second most consumed product in the world is Cement. It contributes nearly 7% of the global carbon dioxide emission. Geopolymer concrete (GPC) is becoming a special type of more eco-friendly concrete alternative to Ordinary Portland Cement (OPC) concrete. This project mainly aims at the study of effect of class F fly ash (FA) and ground granulated blast furnace slag (GGBS) on the mechanical properties of geopolymer concrete (GPC) at different replacement levels (FA50-GGBS50, FA25-GGBS75, FA0-GGBS100) using Sodium silicate (Na 2 SiO 3) and sodium hydroxide (NaOH) solutions as alkaline activator. Specimens were cast and cured for different curing periods at ambient room temperature to determine the GPC mechanical properties viz. compressive, splitting tensile and flexural strength. Test results reveal that increase in GGBS replacement enhanced the mechanical properties of GPC at all ages at ambient room temperature.
Evaluation of Mechanical Properties of Fly Ash and GGBS Based Geopolymer Concrete
Journal of emerging technologies and innovative research, 2017
Geopolymer concrete is emerging as a promising alternative to conventional concrete. It is produced from by-product materials such as Fly ash (FA), Silica fume, and Ground granulated Blast furnace slag(GGBS), recognized as a low emission alternative binder for concrete. Recent studies have shown that the properties of Geopolymers are mostly similar to those of the OPC binder that is traditionally used for concrete. Geopolymer has limitations of slow setting at ambient temperature which can be eliminated by using GGBS. In the present study, an attempt is made to study the mechanical properties of Geopolymer concrete (GPC) containing GGBS as an additional ingredient. Five mix cases having varying GGBS dosages have been considered to study the mechanical properties. Standard cubes (150 mm), cylinders (150 mm dia. x 300mm. Length) and prisms (100 x 100 x 500 mm) were moulded to evaluate the mechanical properties of Fly Ash and GGBS based Geopolymer concrete. The results of the investiga...
Optimum Utilization of GGBS in Fly Ash Based Geopolymer Concrete
Kalpa Publications in Civil Engineering
There have been increasing efforts in recent years to minimize the amount of cement used in concrete. Efforts at partial replacement have been successful and regulations have been promulgated to standardize and use such formulations. Research aimed at complete replacement of cement by activating industrial materials that are rich in silica and alumina with alkaline solutions is still on-going all over the world. The present study was aimed at complete elimination of cement through the development of a geopolymer concrete containing the mixture of fly ash and ground granulated blast furnace slag (GGBS), activated by sodium based alkaline activators. The effect of replacing up to 50% fly ash by GGBS was considered. The strength parameters were studied for a mixture of sodium silicate and sodium hydroxide solution having concentration 12M. The samples were cured under ambient conditions as well as in an oven at 60oC for 24 hours. Compressive and split tensile strengths of the samples w...
Construction and Building Materials, 2014
Inclusion of ground granulated blast furnace slag (GGBFS) with class F fly-ash can have a significant effect on the setting and strength development of geopolymer binders when cured in ambient temperature. This paper evaluates the effect of different proportions of GGBFS and activator content on the workability and strength properties of fly ash based geopolymer concrete. In this study, GGBFS was added as 0%, 10% and 20 % of the total binder with variable activator content (40 and 35%) and sodium silicate to sodium hydroxide ratio (1.5 to 2.5). Significant increase in strength and some decrease in the workability were observed in geopolymer concretes with higher GGBFS and lower sodium silicate to sodium hydroxide ratio in the mixtures. Similar to OPC concrete, development of tensile strength correlated well with the compressive strength of ambient-cured geopolymer concrete. The predictions of tensile strength from compressive strength of ambient-cured geopolymer concrete using the ACI 318 and AS 3600 codes tend to be similar to that for OPC concrete. The predictions are more conservative for heat-cured geopolymer concrete than for ambient-cured geopolymer concrete. The effects of ground granulated blast-furnace slag blending with fly ash and activator content on the workability and strength properties of geopolymer concrete cured at ambient temperature
Characterization & Durability Properties of Ultrafine Fly Ash based Geopolymer Concrete
Huge scale generation of cement is creating environmental issue on one hand and depletion of natural resources on the other hand. This danger to nature has prompted research being made of industrial byproducts as supplementary cementetious materials in making concrete for more green and durable. Fly ash and silica fume both are pozzolanic materials which have been broadly utilized for improving the properties like strength and durability in concrete. Silica fume demonstrates the greater pozzolanic activity then fly ash because of its finer particle size distribution, the pozzolanic activity of fly ash also can be enhanced by decreasing the particle size distribution. Geopolymer is a class of aluminosilicate binding materials integrated by thermal action of solid aluminosilicate based materials such as metakoaline, GGBFS, fly ash. Geopolymer get activated with the alkaline solution and heat. Sodium hydroxide and sodium silicate were utilized as an alkaline solution with a steady ratio of 2.5 and the mix is designed for molarity 10 for the work carried out. In the present study, an attempt has been made to explore the geopolymer concrete by utilizing ultrafine fly ash (UFFA) produced by air classification and processed GGBFS with varied proportions. Discusses on the properties of geopolymer concrete has also been mentioned. Compressive strength and durability tests like Permeability, Abrasion, Sorptivity, Acid and sulphate attack, Drying shrinkage were conducted. In this work geopolymer concrete was prepared with varying proportions of GGBS and UFFA in the ratio of 92.5:7.5 and 88:12 and 80:20. The maximum strength was achieved for the ratio 92.5:7.5. The obtained compressive strength is in the range of 36.5MPa to 91.6MPa from 1st day to 28th day of hot curing.
An Experimental Investigation on GGBFS and Fly Ash Based Geopolymer Concrete
Geopolymer is a new development in the world of concrete in which cement is totally replaced by pozzoloanic materials like fly ash and activated by highly alkaline solutions to act as a binder in the concrete mix. Geopolymer concrete utilizes an alternate material including fly ash as binding material in place of cement. As some of the surveys said one tone manufacturing of cement produces nearly one tone of carbon dioxide and which in turn produces greenhouse gases which cause global warming. Present work selects two l industrial by products such as fly ash and ground granulated blast furnace slag (GGBFS) to manufacture geo polymer concrete. Three Molarities of NaOH 8 M, 10 M, 12 M are considered with the replacement of fly ash with GGBFS and as per Indian Standard Specimens are casted and tested at room temperature curing.
A Parameter to Assess the Strength of Fly Ash and GGBS-Based Geopolymer Concrete
Advances in Sustainable Materials and Resilient Infrastructure, 2022
When developing new-age building materials, "sustainability" and "energy efficiency" are key factors. The long-term view is to reduce exposure through the use of unwanted industrial by-products, which reduces the consumption of natural materials. In this direction, geopolymers have emerged as environmentally friendly substitutes for Portland cement, which, in many areas, not only reduce greenhouse gas emissions but also consume large volumes of industrial waste such as fly ash, mine tailings and metallurgical slag. Geopolymer concrete (GPC) has recently been developed as an alternative to conventional Portland cement (OPC). GPC is produced by combining raw materials such as fly ash (FA), ground granular blast furnace slag (GGBS), which are rich in silicon (Si) and aluminum (Al), using highly alkaline liquids such as NaOH and/or sodium silicate solution (Na 2 SiO 3). These alkaline liquids act as an activator and produce the binder needed to make concrete without the use of cement. In the recent past, several studies Davidovits (1999), Palomo et al. (1999), Lloyd and Van Deventer (2005) and Rangan (2008) have reported various parameters affecting the strength of GPC. These parameters include the amount of source material, the ratio of the activator to the binder, the molarity of the activator solution. Published literature indicates that several variables influenced the strength of the GPC. The combined effect of various parameters on the strength of geopolymer concrete based on GGBS and fly ash was represented by the proposal of a parameter called "Binder Index (Bi)" Rama Seshu