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FLY ASH AMENDED SOILS AS HIGHWAY BASE MATERIALS Ahmet H. Aydilek., Member, ASCE1, Sunil Arora, Member, ASCE 2
 

Summary: 1
FLY ASH AMENDED SOILS AS HIGHWAY BASE MATERIALS
Ahmet H. Aydilek., Member, ASCE1, Sunil Arora, Member, ASCE 2
ABSTRACT
Class F fly ash cannot be used alone in soil stabilization applications as it is not self-
cementing. An activator such as Portland cement or lime must be added to produce
cementitious products often called pozzolan stabilized mixtures. The developed
mixture must possess adequate strength and durability, should be easily compacted,
and most importantly should be economical and environmentally friendly. Roadways
have a high potential for large volume use of the fly ash stabilized soils. The main
objective of this study is to investigate the beneficial reuse of Class F fly ash
amended soil-cement or soil-lime as base layers in highways. A battery of tests was
conducted on soil-fly ash mixtures prepared with cement and lime as activators.
Unconfined compression, California bearing ratio, and resilient modulus tests were
conducted. Results of the study show that the strength of a mixture is highly
dependent on the curing period, the compactive energy, cement content, and water
content at compaction. Lime treatment does not provide sufficient strength for
designing the mixtures as highway bases. A power function in terms of bulk stress
used for granular soils can model the resilient moduli.
INTRODUCTION

  

Source: Aydilek, Ahmet - Department of Civil and Environmental Engineering, University of Maryland at College Park

 

Collections: Engineering