American Society of Civil Engineers


Influence of Fly Ash on Unconfined Compressive Strength of Cement-Admixed Clay at High Water Content


by Pornkasem Jongpradist, (corresponding author), (Assistant Professor, Dept. of Civil Engineering, King Mongkut’s Univ. of Technology Thonburi, Trungkru, Bangkok 10140, Thailand E-mail: pornkasem.jon@kmutt.ac.th), Narongrit Jumlongrach, (Former Graduate Student, Dept. of Civil Engineering, King Mongkut’s Univ. of Technology Thonburi, Trungkru, Bangkok 10140, Thailand.), Sompote Youwai, (Assistant Professor, Dept. of Civil Engineering, King Mongkut’s Univ. of Technology Thonburi, Trungkru, Bangkok 10140, Thailand.), and Somchai Chucheepsakul, (Professor, Dept. of Civil Engineering, King Mongkut’s Univ. of Technology Thonburi, Trungkru District, Bangkok 10140, Thailand.)

Journal of Materials in Civil Engineering, Vol. 22, No. 1, January 2010, pp. 49-58, (doi:  http://dx.doi.org/10.1061/(ASCE)0899-1561(2010)22:1(49))

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Document type: Journal Paper
Abstract: This research studies the potential of using disposed fly ash to add up or partially replace Portland cement Type I in ground improvement by cement column technique. The strength characteristic of cement-fly ash admixed Bangkok clay was investigated by means of a series of unconfined compression tests, paying special attention to the influence of ground fly ash in this mixture. From testing results, the unconfined compressive strength and elastic modulus improved with an increasing of fly ash content. With the cement portions of greater than or equal to 10%, ground disposed fly ash could be employed as a pozzolanic material for partial replacement of cement in cement column construction. Based on the equivalent cementitious material content concept, an empirical equation relating the efficiency factor, α with mixing proportions was proposed. Then, together with this proposed efficiency factor, strength prediction of cement-fly ash admixed clay by Feret’s equation and Abram’s law were carried out and discussed.


ASCE Subject Headings:
Compressive strength
Cement
Fly ash
Water content
Clays
Concrete admixtures

Author Keywords:
Unconfined compressive strength
Cement admixed clay
Fly ash
Equivalent cementitous material content
Efficiency factor