ISSN: 0149-6115
Page Count: 10

New and Economical Mixing Method of Cement-Admixed Clay for DMM Application

Lorenzo, GA
Doctor of Engineering Graduate in the Geotechnical and Geoenvironmental Engineering Program,School of Civil Engineering, Asian Institute of Technology,

Bergado, DT
Professor in the Geotechnical and Geoenvironmental Engineering Program,School of Civil Engineering, Asian Institute of Technology,

Soralump, S
Faculty in the Geotechnical Engineering, Kasetsart University,

(Received 5 August 2003; accepted 14 July 2005)

Abstract

The results of unconfined compression and oedometer compression tests confirmed the existence of optimum mixing clay water content for economical and efficient mixing of cement and clay for deep mixing method (DMM) application. A concept supporting the existence of optimum mixing clay water content is presented, and a schematic diagram idealizing the clay-water-air-cement interactions is illustrated. The optimum mixing clay water content (C^w,opt) is defined as the total clay water content of the clay-water-cement mixture that would yield the highest possible improvement in strength of cured cement-admixed clay. Based on the test results presented, the C^w,opt would fall near the liquid limit of the base clay. Significantly, at this optimum mixing water content, only 10% cement by weight is needed instead of the corresponding 17 % in the conventional method of mixing, with consequent 40 % reduction of cement content and cost.

Keywords:
cement-admixed clay, deep mixing method, ground improvement, optimum mixing clay water content, economical mixing

Paper ID: GTJ12129
DOI: 10.1520/GTJ12129
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