Low Cost Fly Ash, Sand Stabilized Roadway

Low Cost Fly Ash, Sand Stabilized Roadway
Author: S. J. Klassen
Publisher:
Total Pages: 32
Release: 1986
Genre: Fly ash
ISBN:
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Fly ash, a by-product of coal-fired electricity generating plants, has for years been promoted as a material suitable for highway construction. Disposal of the large quantities of fly ash produced is expensive and creates environmental concerns. The pozzolanic properties make it promotable as a partial Portland cement replacement in pc concrete, a stabilizer for soil and aggregate in embankments and road bases, and a filler material in grout. Stabilizing soils and aggregates for road construction has the potential of using large quantities of fly ash. Iowa Highway Research Board Project HR-194, "Mission-Oriented Dust Control and Surface Improvement Processes for Unpaved Roads", included short test sections of cement, fly ash, and salvaged granular road material mixed for a base in western Iowa. The research showed that cement fly ash aggregate (CFA) has promise as a stabilizing agent in Iowa. There are several sources of sand that when mixed with fly ash may attain strengths much greater than fly ash mixed with salvaged granular road material at little additional cost

Fly Ash Soil Stabilization for Non-uniform Subgrade Soils: Engineering properties and construction guidelines

Fly Ash Soil Stabilization for Non-uniform Subgrade Soils: Engineering properties and construction guidelines
Author:
Publisher:
Total Pages: 182
Release: 2005
Genre: Fly ash
ISBN:
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Soil treated with self-cementing fly ash is increasingly being used in Iowa to stabilize pavement subgrades, but without a complete understanding of the short- and long-term behavior. To develop a broader understanding of fly ash engineering properties, mixtures of five different soil types, ranging from ML to CH, and several different fly ash sources (including hydrated and conditioned fly ashes) were evaluated.

Evaluation of Western Coal Fly Ashes for Stabilization of Low-Volume Roads

Evaluation of Western Coal Fly Ashes for Stabilization of Low-Volume Roads
Author: JP. Turner
Publisher:
Total Pages: 15
Release: 1997
Genre: Fly ash
ISBN:
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A laboratory study is described in which the engineering properties of subgrade soils were modified by treatment with fly ash derived from low-sulfur western coal. A wide range of soil types including gravel-sand, silty sand, sandy silt, and highly plastic clay exhibited substantial improvements in compressive strength, resilient modulus, and wet-dry and freeze-thaw durability when treated with fly ash from several Wyoming power plants. Application of the test results to design of aggregate-surfaced secondary roads indicates that use of fly ash stabilization can decrease the required aggregate thickness substantially. Currently there are no standards which specify minimum required improvements in the engineering properties of fly ash treated soils.

Properties of Sand-self Cementing Fly Ash Mixtures

Properties of Sand-self Cementing Fly Ash Mixtures
Author: Naveen Santhapur
Publisher:
Total Pages: 70
Release: 2007
Genre:
ISBN:
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The Class C fly ash which is an industrial by-product of coal combustion in electric power plants has cementing characteristics which can be utilized for the stabilization of soils. Laboratory investigation was done to analyze and determine the behavior, engineering properties of the sand-class C fly ash mixtures. Several samples of this mixture were prepared with desired mix proportions and triaxial, California Bearing Ration (CBR) tests were performed. The test results were used to evaluate the effectiveness of this mixture as a pavement base course. An illustrative low volume road design incorporating fly ash stabilized soil as its base course is shown. Also a model of pile foundations in the stabilized soil was built in the laboratory and compression testing was performed on these piles until failure to understand the nature of load deflection curves and to determine the load carrying capacity.