Effect of Fly Ash on Geotechnical Properties of Local Soil-Fly Ash Mixed Samples (original) (raw)

EFFECT OF FLY ASH ON GEOTECHNICAL PROPERTIES OF SOIL

This paper investigates the effect of fly ash (generated from thermal power plant, Panki, Kanpur) on geotechnical properties of local soil, Bhauti Kanpur (U.P), INDIA. The fly ash used in the experimental work was of Class 'F' and soil was clayey in nature .Fly ash collected from the hopper attached to an electrostatic precipitator when coal was changed at a coal fired power plant. Concerning the major challenges regarding the safe reuse, management and disposal of these wastes an attempt has been made to mix fly ash at 5,10, 15, 20, 25, and 30% on the basis of dry weight with local clay soil. To understand the behavior of fly ash with soil, numbers of laboratory experiments were performed on the local soil (clay) and contaminated soil with varying percentage of fly ash. As the result, it is shown that all the investigated properties were decreased except CBR value and optimum moisture content.

Impact of Fly Ash on Soil Properties

National Academy Science Letters-india, 2012

Management of fly ash is a major environmental and economic concern for the coal fired power generators all over the world. Fly ash is rich in many macro and micro plant nutrients. Present study was conducted to evaluate the impact of fly ash incorporation on physicochemical properties of soil for agricultural purposes. Pot culture experiments were conducted to find out the most suitable level of fly ash for soil amendment that can improve the fertility of soil leading to higher productivity of the test crop. 40% fly ash was found most suitable for growth and yield of test crop. The amended soil was analyzed for different physico-chemical properties. It was observed that fly ash altered the soil texture, decrease bulk density, increase water holding capacity, soil porosity, pH, electrical conductivity and organic carbon values of the soil. A marginal increase was also observed in the concentration of P, K, S, Fe, Zn, Mn, B, Ca and Mg elements in the fly ash amended soil. However, there was marked decrease in N content of the soil.

Effects of Fly ash on Engineering Properties of BC Soil

Large areas are covered with highly plastic and expansive BC soil which is unsuitable for construction purpose. The wide spread of the BC soil in the city created challenges and problems to the construction activities. Some waste materials such as fly ash may use to make the soil to be stable. Addition of such materials will increase the physical as well as chemical properties of the soil. This paper presents a study of the effectiveness as an additive in improving the engineering characteristics of BC soil. The objective of this study was to evaluate the effect of fly ash in stabilization of BC soil. Experiments were carried out to evaluate the effect of the fly ash content on the plasticity, swell index & compaction parameters of expansive soil. The plasticity and swelling properties of the blends decreased and the dry unit weight increased with an increase in fly ash content. The percentage of fly ash content was varied from 10% to 50%. The optimum dose of fly ash was observed to...

Physical and Compaction Behaviour of Clay Soil–Fly Ash Mixtures

At present, nearly 100 million tonnes of fly ash is being generated annually in India posing serious health and environmental problems. To control these problems, the most commonly used method is addition of fly ash as a stabilizing agent usually used in combination with soils. In the present study, highcalcium (ASTM Class C-Neyveli fly) and lowcalcium (ASTM Class F-Badarpur fly ash) fly ashes in different proportions by weight (10, 20, 40, 60 and 80 %) were added to a highly expansive soil [known as black cotton (BC) soil] from India. Laboratory tests involved determination of physical properties, compaction characteristics and swell potential. The test results show that the consistency limits, compaction characteristics and swelling potential of expansive soil-fly ash mixtures are significantly modified and improved. It is seen that 40 % fly ash content is the optimum quantity to improve the plasticity characteristics of BC soil. The fly ashes exhibit low dry unit weight compared to BC soil. With the addition of fly ash to BC soil the maximum dry unit weight (c dmax ) of the soil-fly ash mixtures decreases with increase in optimum moisture content (OMC), which can be mainly attributed to the improvement in gradation of the fly ash. It is also observed that 10 % of Neyveli fly ash is the optimum amount required to minimize the swell potential compared to 40 % of Badarpur fly ash. Therefore, the main objective of the study was to study the effect of fly ashes on the physical, compaction, and swelling potential of BC soils, and bulk utilization of industrial waste by-product without adversely affecting the environment.

Effect of Stone Dust and Fly Ash on Some Geotechnical Properties of Soil

International Journal of Advance Engineering and Research Development, 2017

Stone dust is a kind of solid waste material that is generated from stone crushing industry which is abundantly available. It is estimated that each crusher unit produce 15%-20% stone dust. Disposal of such wastes creates lots of geo-environmental problems such as landfill disposal problems, health and environmental hazards. One of the best way to eliminate these problems is to make use such waste. Fly ash is a waste by product from thermal power plants, and consuming thousands hectares of precious land for its disposal and also causing severe health and environmental hazards. This paper presents the results of an experimental program undertaken to investigate the effect of stone dust & fly ash combined in equal percentages on physical properties soil and to study effect of this admixture on the geotechnical properties such as index properties including Liquid Limit, Plastic Limit, Compaction characteristics and CBR value.

Utilisation of fly ash to improve the engineering properties of lateritic soil

This study examined the potential utilisation of fly ash obtained from a coal fired thermal power station to improve the engineering properties of a residually derived lateritic soil. The evaluation involved the determination of a number of geotechnical parameters used to assess performance of stabilised earthen materials such as index properties, compaction characteristics, hydraulic conductivity, compressive strength and desiccation induced shrinkage. Soil mixtures with varying proportions of fly ash (0%-20%) were compacted at predetermined optimum moisture contents with three compactive efforts namely British Standard Light (BSL), West African Standard (WAS) and British Standard Heavy (BSH) that represent the minimum, medium and maximum efforts expected in the field. Results showed that the plasticity index (PI), dry unit weight, hydraulic conductivity and desiccation induced shrinkage were lowered on addition of fly ash. Conversely, optimum moisture content (OMC) as well as unconfined compressive strength increased.

GEO-ENGINEERING PROPERTIES OF FLY ASH

The aim of the Project is to find out the geo-engineering properties of fly ash, in geo-engineering field. The project describes the use of local fly ash in construction industry in a way to minimize the industrial waste such as fly-ash, slag etc can be effectively used in soil stabilization. If these materials can be used in highway or dam construction, it will be a great effort in minimizing the industrial pollution. Experiments are done in order to determine the geo-engineering properties of fly ash, which can taken account in the construction field. A brief comparison is made between fly ash and other soil properties which are used as sub-grade, base in Highway construction.

Study on the Characterization and Classification of Fly Ash Samples Obtained Locally

MIDDLE EUROPEAN SCIENTIFIC BULLETIN, 2023

The excavation of soil for various construction purposes, such as road construction, earth dam construction, soil stabilization, and backfill material, raises significant concerns as it takes thousands of years for natural topsoil to form. This excavation often leads to deforestation, which negatively impacts biodiversity. To address these issues, industrial waste materials like fly ash and slag can be effectively utilized as alternatives to natural soil. The sustainable utilization of fly ash is particularly important for thermal power stations, as large-scale usage in geotechnical construction projects can reduce the challenges associated with its disposal. However, since the properties of fly ash can vary depending on its source, it is crucial to assess the variability of these properties before using fly ash as a construction material. In this study, four different fly ashes from local thermal power plants were examined through various geotechnical laboratory experiments to determine their properties. The results obtained from these experiments were then compared with existing literature on fly ash properties. The study identified the optimum lime content required for achieving a desirable unconfined compressive strength, which was found to depend on the specific source of fly ash. Using an existing classification scheme for fly ash, it was observed that all four fly ashes belonged to the same class. However, significant variations in their properties were noted. The experimental results also indicated that the strength, cohesion, and friction of fly ash could be improved by stabilizing it with lime. Nevertheless, the strength values and the degree of improvement differed noticeably among the four fly ashes. Therefore, it is necessary to consider an alternative classification scheme for fly ash when utilizing it as a fill and embankment material in order to ensure its effective utilization.

Effect of Fly-Ash on Engineering Characteristics of Silty Soil

In India, silty soil are available in many states and have poor supporting capacity. Main objective of this research is to utilize the industrial waste like fly-ash to improve the engineering characteristics of the silty soil. Soil samples blended with the fly-ash from 0% to 50% of dry weight of the soil. Samples were prepared and results showed a significant increase in soaked California Bearing Ratio (CBR) value. Liquid limit decreased from 30.66% to 23.31% and plasticity index decreased from 10.21% to 6.29%. DFS of silty soil reduced from (31%) to (5%). From the compaction tests result decreased in maximum dry density (MDD) from 1.71 gm/cc to 1.55gm/cc and increased in optimum moisture content (OMC) from 20.4% to 24.31%. In this investigation it can be seen that fly-ash has a potential to improve the engineering characteristics of silty soil.

IJERT-Effect of Fly Ash in Agricultural Field on Soil Properties and Crop Productivity - A Review

International Journal of Engineering Research and Technology (IJERT), 2013

https://www.ijert.org/effect-of-fly-ash-in-agricultural-field-on-soil-properties-and-crop-productivity-a-review https://www.ijert.org/research/effect-of-fly-ash-in-agricultural-field-on-soil-properties-and-crop-productivity-a-review-IJERTV2IS120157.pdf Fly ash is regularly generated as a by-product by coal or thermal power stations. The potential of fly ash as a resource material in agriculture and related areas is now a well-established fact. The application of fly ash in agriculture because of its favorable physic chemical properties, including appreciable content of essential plant nutrients. While compare to soil, fly-ash consists all the elements except organic carbon and nitrogen. The purpose of this paper is to provide an overview of characterization and utilization of fly ash in agriculture. The effect of fly ash on soil properties, improvement in the crop yields, heavy metal uptake by the plants and ground water contaminations were mentioned.