WITHDRAWN: Experimental investigation on improving properties of concrete with OPC as geopolymer binder
TL;DR: In this article, an experimental investigation has been carried out to optimize the percentage of OPC for achieving the sufficient strength of flyash-based geopolymer concrete without external temperature curing.
About: This article is published in Materials Today: Proceedings.The article was published on 2020-08-12. It has received 3 citations till now. The article focuses on the topics: Properties of concrete & Geopolymer.
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TL;DR: In this article, a review paper was carried out to explore various elements such as the precursors used in geopolymers concrete and their corresponding applications, and the environmental impacts of various geopolymer concrete are also discussed.
43 citations
TL;DR: In this paper , the potential of using hazelnut shell ash (HA), which is agricultural waste, as a mineral additive in the production of cementless concrete has been handled in the present research.
9 citations
24 May 2022
TL;DR: In this paper , the authors highlight rubber's potential as a replacement to natural aggregate, in alkali-activated concrete, and discuss rubber effects on fresh, hardened, and durability performance of AAC compared to cement-based concrete.
Abstract: Over the past few years, the construction industry has entered new challenges in production. One of the main challenges is utilizing solid waste as aggregates to achieve environmentally friendly construction materials. Moreover, with the advent of alkali-activated materials, as a replacement of cement, more potential for achieving sustainability became possible. Hence, this paper highlights rubber's potential, as a replacement to natural aggregate, in alkali-activated concrete. The paper discusses rubber effects on fresh, hardened, and durability performance of AAC compared to cement-based concrete. This information will be helpful in extending the use of rubber in construction applications.
1 citations
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TL;DR: In this article, the fly ash-based geopolymer concrete is described and the material and the mixture proportions, the manufacturing process, and the influence of various parameters on the properties of fresh and hardened concrete.
Abstract: In recent years, attempts to increase the utilisation of fly ash to partially replace the use of Portland cement in concrete are gathering momentum. Geopolymer concrete is a ‘new’ material that does not need the presence of Portland cement as a binder. Instead, activating the source materials such as fly ash that are rich in Silicon (Si) and Aluminium (Al) using high alkaline liquids produces the binder required to manufacture the concrete. Hence, concrete with no cement.This paper presents information on fly ash-based geopolymer concrete. The paper covers the material and the mixture proportions, the manufacturing process, and the influence of various parameters on the properties of fresh and hardened concrete.
621 citations
TL;DR: In this paper, the influence of various parameters on the short term engineering properties of fresh and hardened low-calcium fly ash-based Geopolymer mortar were studied, and the obtained compressive strength was in the range of 1.6MPa -20MPa.
Abstract: Geopolymer is a novel binding material produced from the reaction of fly ash with an alkaline solution. In Geopolymer mortar, Portland cement is not utilized at all. In this research, the influence of various parameters on the short term engineering properties of fresh and hardened low-calcium fly ash-based Geopolymer mortar were studied. Tests were carried out on 50 x 50 x 50mm cube Geopolymer mortar specimens. The test results revealed that as the concentration of alkaline activator increases, the compressive strength of Geopolymer mortar also increases. Specimens cured at temperature of 65 o C for 1 day showed the highest 28 days compressive strength. The mass ratio of activator/fly ash of 0.4 produced the highest 28 days compressive strength for the specimen. The obtained compressive strength was in the range of 1.6MPa – 20MPa.
193 citations
TL;DR: In this article, the compressive strength of fly ash-based geopolymer concrete has been evaluated by varying the types of curing, namely ambient curing and hot curing, and the results showed that there is an increase in compressive performance with the increase in age for ambient cured specimens.
Abstract: In order to address environmental effects associated with Portland cement, there is need to develop alternative binders to make concrete. An effort in this regard is the development of geopolymer concrete, synthesized from the materials of geological origin or by product materials such as fly ash, which are rich in silicon and aluminum. This paper presents results of an experimental study on the density and compressive strength of geopolymer concrete. The experiments were conducted on fly ash based geopolymer concrete by varying the types of curing namely ambient curing and hot curing. The ratio of alkaline liquid to fly ash was fixed as 0.4. For all the samples the rest period was kept as 5 days. For hot curing, the temperature was maintained at 60oC for 24 h in hot air oven. The compressive strength test was conducted for each sample and the results showed that there is an increase in compressive strength with the increase in age for ambient cured specimens. For hot cured samples the increase in compressive strength with age was very less as compared to that of specimens subjected to ambient curing. The density of geopolymer concrete was around 2400 kg/m3 which is equivalent to that of conventional concrete.
Key words: Fly ash, geopolymer concrete, alkaline liquid, density, compressive strength.
141 citations
TL;DR: In this paper, an attempt has been made to find out an optimum mix for the Geopolymer concrete, where fly ash reacts with alkaline solution and Sodium Silicate (Na 2 SiO 3 ) to form a gel which binds the fine and coarse aggregates.
Abstract: Geopolymer concrete utilizes an alternate material including fly ash as binding material in place of cement. This fly ash reacts with alkaline solution (e.g., NaOH) and Sodium Silicate (Na 2 SiO 3 ) to form a gel which binds the fine and coarse aggregates. Since Geopolymer concrete is the emerging field, the guidelines from the Bureau of Indian Standards are yet to be formulated. An attempt has been made to find out an optimum mix for the Geopolymer concrete. Concrete cubes of size 150 × 150 × 150 mm were prepared and cured under steam curing for 24 hours. The compressive strength was found out at 7 days and 28 days. The results are compared. The optimum mix is Fly ash: Fine aggregate: Coarse aggregate (1:1.5:3.3) with a solution (NaoH&Na 2 SiO 3 combined together) to fly ash ratio of 0.35. High and early strength was obtained in the Geopolymer concrete mix.
46 citations