Comprehensive Investigation on the Potential of Fly Ash from New Source as Construction Material (original) (raw)
Related papers
UKH Journal of Science and Engineering, 2021
Cement is one of the most widely used building materials on the planet. Cement manufacturing has also increased carbon emissions to their greatest level in recent years. Alternative or low-emissions binders have become more popular as a partial cement substitute in recent years. Because of its huge yearly output as waste material and low cost, fly ash is now regarded as one of the most accessible choices. Fly ash-based construction materials have a lot of promise as cement substitutes because of their high performance and inexpensive cost. The purpose of this article is to look at how fly ash affects the workability, setting time, compressive strength, and tensile strength of concrete. The kinds and characteristics of fly ash were also investigated.
UTILIZATION OF FLY ASH AS A CEMENTITIOUS MATERIAL: AN OVERVIEW
IAEME PUBLICATION, 2020
The constant cement production results in a rise in carbon dioxide released into the air, which harms the ecosystem and causes greenhouse effects that cause climate change. The establishment of new sustainable material is thus becoming imperative as an alternative to normal concrete. To this end, several studies have been carried out with a partial or total replacement of cement by fly ash. Products with the inclusion of fly ash are considered a relatively new, innovative, and sustainable material with many advantages, including high strength, reduced use of natural resources, costeffectiveness. This study has carried an overview of the utilization of fly ashes in geopolymer, engineered cementitious composites (ECC), roller compacted concrete (RCC), previous concrete, and masonry bricks. The findings showed that the utilization of fly ash to manufacture concrete and masonry products which contribute to sustainable materials and environment-friendly building products.
Properties of Concrete Utilizing Self-Cementing High-Calcium Fly Ash as Sole Binder Material
Jurnal Teknologi
Fly ash, a waste material derived from the coal burning in power plants, could be utilized in concrete mixtures as a filler or as a cement replacement material, either partially or fully. Some papers also report that high-calcium fly ash can be utilized as a cementitious material through the hydration process. However, there are just a few papers that studied the behavior of concrete that utilizes high-calcium fly ash as the sole binder material without any chemical activators. Furthermore, there are no reports about whether the effect of the different water-to-cementitious ratios of this concrete is the same as the ordinary Portland cement concrete. This paper presents an initial development on the use of fly ash as a sole binder material, i.e., 100% fly ash concrete without any chemical solution as an activator. This research utilizes the high calcium content in the fly ash to produce concrete with a commonly used method (just add the water without any alkali activator) and invest...
Study of Utilization of Fly Ash as a Partial Replacement for Cement in Concrete
International Journal of Current Engineering and Scientific Research, 2019
Mining industry produces a large quantity of waste every year resulting in severe damage to the environment. The wastes that are produced during mining should be efficiently disposed or effectively reused for any other productive purposes. Coal and lignite mining results in considerable dust pollutions very specifically the coal beneficiation process produces extensive amount of ashes. These ashes can be utilized in construction materials rather than dumping as landfill. When dumped as landfills, these ashes have the tendency to be carried away by the wind resulting in massive damage to the surrounding environment. This study is made to investigate whether this fly ash can be used as an ingredient in concrete preparation as a partial replacement for cement by studying the strength properties of fly ash mixed concrete. The strength properties of concrete when certain percentage of cement in the concrete is replaced with fly ash are studied. The replacement percentage of cement is maintained at 10%, 20%, 30%, 40% and 50% and the samples are tested in the laboratory after the curing period of 21 days. The workability, tensile strength, compressive strength and shear strength of the fly ash mixed concrete sample are determined. Similar tests are conducted on concrete with no fly ash content and both results are compared to find the optimum amount of fly ash that can be replaced without compromising the quality of the concrete. By utilizing fly ash as partial replacement to cement the percentage of CO2 emitted due to cement manufacturing can also be considerable reduced.
2009
This research paper seeks to optimize the benefits of using High Lime fly ash in concrete as a replacement for large proportions of cement. High Lime fly ash is a type of sub-bituminous fly ash that is self-cementing as well as pozzolanic in nature. High Lime fly ash would be categorized as a Class C fly ash by ASTM because of its high calcium content, however its sulfur content exceeds the limit set in ASTM C618 The physical and chemical properties of this type of fly ash, particularly its fineness and carbon content properties (coarser particles and low carbon content), provide potential benefits. These two properties are of great concern since they will affect the air content and water demand of the concrete; parameters that greatly affect the durability and strength of concrete. This paper describes early stages of a project to study the use of large volumes of High Lime fly ash in concrete. During the project High Lime fly ash obtained from a local power plant will be used in t...
Properties of cement-based materials containing fly ash
Proceedings of the Second International Conference on Performance–based and Life-cycle Structural Engineering (PLSE 2015), 2015
Fly ash has been increasingly used in concrete structures due to both environmental and technical benefits. Despite significant past research, our understanding of thermal and physical properties of fly ash mortar and concrete remains incomplete and thus needs further investigation. This paper presents results of a study into important fundamental thermal and physical properties of both fly ash mortar and fly ash concrete. Replacement levels of Portland cement by fly ash investigated were30%, 50% and 60% by mass. In cement-fly ash mortar tests, increasing fly ash content was found to delay setting times, decrease both compressive and flexural strengths and reduce hydration heat. The effect of fly ash on hydration heat evolution of cement binder was quantitatively analysed. The obtained reduction coefficient (k) would allow reasonable prediction of temperature rise in concrete structures, which is of particular interest for mass concrete construction. In cement-fly ash concrete tests, thermal properties, including thermal diffusivity, conductivity and specific heat, were also measured and reported. There also appeared a linear relationship between compressive and flexural strengths of
Challenge Journal of Concrete Research Letters
Researchers and decision makers are continuously looking out to determine the potential and effectiveness of fly-ash as a partial replacement of cement in concrete. The current study is carried out to check the optimum or nearly optimum quantity of fly-ash with which cement should be replaced to get most of the properties of concrete enhanced and to give the idea about the quantities of fly-ash that can be used in a better way and better cause so that a proper management scheme of its usage and disposal can be implied. Further, a comparison is given between normal concrete and fly-ash concrete to show the properties which can be enhanced by proper utilization of fly-ash as a partial replacement of cement. After carrying out the lab experiments, it has been seen that the replacement of fly-ash in concrete has resulted in general increase in compressive strength, flexural strength and splitting tensile strength up to 15% replacement and after then the strength is decreased considerabl...
Researchers and decision makers are continuously looking out to determine the potential and effectiveness of fly-ash as a partial replacement of cement in concrete. The current study is carried out to check the optimum or nearly optimum quantity of fly-ash with which cement should be replaced to get most of the properties of concrete enhanced and to give the idea about the quantities of fly-ash that can be used in a better way and better cause so that a proper management scheme of its usage and disposal can be implied. Further, a comparison is given between normal concrete and fly-ash concrete to show the properties which can be enhanced by proper utilization of fly-ash as a partial replacement of cement. After carrying out the lab experiments, it has been seen that the replacement of fly-ash in concrete has resulted in general increase in compressive strength, flexural strength and splitting tensile strength up to 15% replacement and after then the strength is decreased considerably than that of normal concrete. Addition of fly-ash in concrete has resulted in decrease in the water absorption of concrete and hence decreases in permeability of concrete. There is a progressive increase in workability with increase in percentage of fly-ash in concrete. The current study has led to a conclusion that in order to achieve best results in use of fly-ash concrete, the fly-ash used for replacing cement in concrete should have the required properties as specified by the standards and proper techniques of processing fly-ash as well as mixing of fly-ash with cement must be employed.
Indonesian journal of urban and environmental technology, 2024
Innovations in material technology are expected to reduce the use of commercial cement and replace it with other environmentally friendly materials with the same performance as normal concrete. Aim: This study aim to analyze the mechanical property of High-Volume Fly Ash Concrete (HVFAC) using F class fly ash with different mix percentages. Methodology and Results: The experiment was conducted in laboratory scale. Four variations of test specimens consisted of: 1 variation (F0), which is conventional concrete with 100% Portland cement as control specimen, and three variations of HVFC (F70, F80, and F90), which were made with fly ash content (%) 70, 80, and 90 of total cementitious. Fresh concrete testing to determine workability, while hard concrete testing is done by density and compressive strength tests at the age of 3, 7, and 28 days on specimens that have been treated with the water submerged curing method. Conclusion, significance, and impact of study: All HVFAC specimens fulfill the Self Compacting Concrete (SCC) category. The compressive strength test results at 28 days showed that the addition of fly ash percentage caused a decrease in compressive strength values in all HVFAC variants, but still exceeded the minimum requirements of high and medium quality concrete. All HVFAC variations meet the requirements of ASTM C618-23 based on the evaluation of Strength Activity Index (SAI) values at 7 and 28 days of age. The utilization of 90% fly ash as a cement substitute resulted in an environmentally friendly concrete product based on the concept of cleaner production.