Abstract
Geopolymers are obtained by use of alteration of chemical composition and crystal structures of different minerals. Use of geopolymer is an effective and environmental friendly solution in stabilization of clayey soil. The vinyl based copolymer is used as an agent as dust controller, highway soil stabilizer, asphalt admixture, concrete production, etc. In this study, strength of a clay is improved by use of a commercial geopolymer. In this regard, soil was amended with polymer ranging among 0 % to 4 %, by volume of dry soil. Unconfined compression and oedometer tests were carried out to evaluate the effects of temperature, initial water content, compaction energy on strength and compression properties of a clay soil - within an experimental framework. The results revealed that, temperature has a considerable effect on geopolymerization. Besides, under constant moisture content during curing, increasing geopolymer content and curing period causes a slight increase in strength of specimens.
Highlights
Geotechnical properties of fine grained soils are poor, and these materials are not preferred as a foundation, or a base/subbase material
In 1-day cured specimens prepared at 20 °C temperature, strength increases according to geopolymer content were observed
The effects of curing period, geopolymer content and temperature on geopolymer treated kaolin were investigated under certain curing conditions
Summary
Geotechnical properties of fine grained soils are poor, and these materials are not preferred as a foundation, or a base/subbase material. Since clay soils are highly sensitive to total/differential settlements with the increase in water content of the soil, aiming to use water for hydration of binders, many agents including cement, lime, fly ash, blast furnace slag, etc are used for stabilization of these types of soils, which provide development in strength, compression and index characteristics. Utilization of geopolymers for soil stabilization is increasing due to environmental concerns, and it is previously reported that alkali activation causes an increase in peak strength [1] and increasing geopolymer content causes increase in unconfined compressive strength of soil [2]. By use of metakaolin based geopolymer for stabilization, Zhang et al [5] report marked improvements in strength, ductility and stiffness of the soil. The authors stress that the shrinkage of soil is lowered by geopolymer use
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