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Improvement of Clay Soil Characteristics by Using Fly Ash, Bamboo Leaf Ash and Rice Husk Ash

M. R. Karim
Department of Civil Engineering, Rajshahi University of Engineering & Technology, Bangladesh

M. H. Hasan
Department of Civil Engineering, Rajshahi University of Engineering & Technology, Bangladesh

M. A. Alim*
Department of Civil Engineering, Rajshahi University of Engineering & Technology, Bangladesh

Abstract/ Executive Summary:

Some waste materials such Fly Ash, Rice husk ash, Bamboo Leaf ash may use to make the soil stable. The objective of this study was to evaluate the effect of Fly Ash, Rice Husk ash and Bamboo Leaf ash derived from combustion of sub-bituminous coal at electric power plant, burning of rice husk and bamboo leaf in improving of clay soils. Tests were conducted on untreated soils and treated soils with Fly Ash, Rice Husk ash and Bamboo Leaf ash. Addition of 15% Fly ash, Bamboo leaf ash and Rice husk ash increased dry density, unconfined compressive strength and California bearing ratio while addition of 20% admixtures decreased the above properties. So it can be concluded that for 15% addition of admixtures (fly ash, bamboo leaf ash and rice husk ash) soil quality improved because the voids of the soil is replaced by the admixtures. But 20% addition of admixture with soil the excess amount of ash reduced the geotechnical properties of soil.

Keywords: Clayey soil, Improvement, Rice husk ash, Bamboo leaf ash, Fly ash, CBR, Strength.

Location: Department of Civil Engineering, Rajshahi University of Engineering & Technology, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil Physical Properties, Ash, Rice husk

Objectives:

On the other hand fly ash also shows the similar behavior of rice husk ash and bamboo leaf ash. The utilization of waste material is not only the proportioning solution of disposal problem, but also saves construction cost. The main objective of this paper is to investigate the potential of using waste materials in the field of geotechnical engineering.

Methodology:

Clay-type soil is used in this study. The soil was collected from Rajshahi University of Engineering & Technology (RUET) campus near Vodra Moore, Rajshahi. Then fly ash, bamboo leaf ash and rice husk ash are collected from different available locations.

The Bamboo leaf ash and Rice husk ash had been collected from Bagatipara in Natore. Bamboo leaf as was obtained by burning the dried Bamboo leaf and the Rice husk ash was obtained by burning the Rice husk. Fly ash has been collected from a nearby thermal power station at Baropukuria in Dinajpur district. Fly ash had been collected from a nearby thermal power station at Barapukuria in Dinajpur district. Fly ash was produced from brunt crush from the coal-fed power plant. It is available in Barapukuria coal-based power plant. Annually 52000 MT fly ash is produced. Its disposal caused environmental pollution.

3. METHODOLOGY Collected soil sample was kept in the laboratory for three weeks to reach it air-dried condition. After that the soil sample was oven-dried and grinded. The soil samples were prepared by adding the Fly ash, Bamboo leaf ash and Rice husk ash for 5%, 10%, 15% and 20% (by weight). The collected oven-dried sample was passed through a 4.75mm sieve so that the homogeneous sample can be prepared. For the preparation of each specimen, all the materials were mixed thoroughly by trawl and passed the mixture by 20mm sieve. After mixing of different percentages of admixtures different laboratory tests are required. Such as Atterberg’s limits test, standard proctor test, unconfined compression strength test and California bearing ratio test. These tests were performed to evaluate liquid limit, plastic limit, shrinkage limit, maximum dry density, optimum moisture content, unconfined compression strength and CBR.

Source of Information: Journal of Engineering Science 06(1&2), 2015, 81-85

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study can serve as an effective method to utilize fly ash, bamboo leaf ash and rice husk ash in the stabilization of soil. The following conclusions could be drawn from the study: i. The soil used in this study is clay which contains sand 6.55%, silt 33.25% and clay 60.2%. Other geotechnical properties are specific gravity 2.66, liquid limit 42.80%, plastic limit 20.69%, optimum moisture content 19.35%, maximum dry density 1.671 g/cm³, unconfined compression strength 108 kPa and CBR value is 8.09%. ii. It is found that by adding up to 20% admixtures (fly ash, bamboo leaf ash and rice husk ash) into the untreated soils, liquid limit decreases and plastic limit increases. Whereas maximum dry density, unconfined compression strength and CBR increase by adding upto15% admixtures, on the other hand, decrease these parameters for further addition 20% of admixtures with untreated soil. It indicates that the untreated soil improved due to the addition of 15% admixtures.

Knowledge Management: Journal