Physical, chemical, and geotechnical properties of coal fly ash: A global review

Study of mechanism of electroless copper coating of fly-ash cenosphere particles

An experimental investigation was conducted to evaluate the effects of polypropylene fiber inclusions on the geotechnical characteristics of a clayey soil that was chemically stabilized w...

Effects of polypropylene fiber inclusion on the strength and volume change characteristics of cement-fly ash stabilized clay soil

This paper presents the results of a laboratory investigation on tensile strength, bearing ratio, and slake durability characteristics of a class F fly ash stabilized with lime alone or in combination with gypsum. The effects of lime content (4, 6, and 10%), gypsum content (0.5 and 1.0%), and curing period (up to 90 days) on the tensile strength, bearing ratio, and durability characteristics of the stabilized fly ash are highlighted. Unconfined compressive strength test results for the mixes cured up to 90 days are presented to develop relationships between different tensile strengths (Brazilian and flexural) and unconfined compressive strength. Both soaked and unsoaked bearing ratio tests were also carried out on this stabilized fly ash. The Brazilian tensile strength of the lime and gypsum stabilized fly ash mixes varied between 309 and 1,084 kPa for 45 days curing. The flexural strength of the lime and gypsum stabilized mixes cured for 45 days varied between 665 and 1,459 kPa. Fly ash stabilized with lime and gypsum showed medium durability at 28 days curing and there was enhancement of durability with increase in curing period. Empirical models to estimate tensile strength, bearing ratio, and slake durability indices of stabilized fly ash from unconfined compressive strength test results are also proposed herein. With enhanced tensile strength and durability characteristics, the stabilized fly ash may find potential use in civil engineering construction.

Tensile Strength Bearing Ratio and Slake Durability of Class F Fly Ash Stabilized with Lime and Gypsum

Neural network prediction of unconfined compressive strength of coal fly ash–cement mixtures

Coal‐burning power plants generate a large amount of fly ash in the United States. A small fraction of the fly ash generated is being utilized in various applications. There is a particular need for further utilization of fly ash. In this paper the results from a recent study on development of a cement composite utilizing relatively large amounts of fly ash are presented. Potential areas of application include waste‐disposal site liners and backfills. The flowable fly ash‐cement sand composite was investigated for strength and permeability characteristics at various stages of maturity. The independent variables considered were: fly‐ash content, sand content, and ratio of water to cementitious materials. Results of this study show that high‐volume fly‐ash composite can be proportioned to obtain compressive strengths as high as 21 MPa (3,000 psi) at 180 days. For applications requiring strengths less than 3 MPa (500 psi), the mixture with fly ash‐cement ratio of 10 and sand‐cement ratio of 20 with relativel...

P. N. Balaguru

Papers

Properties of Flowable High-Volume Fly Ash–Cement Composite