有明粘土の生石灰による改良効果に及ぼす有機物と塩分の影響

概要

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Disposal of surplus very soft Ariake clays from the construction sites has become an urgent problem due to its very high water content and low shear strength. An improvement of the surplus soils is necessary. An extensively used method is the chemical improvement by cementing agents as lime. The strength of the clay increases with due to the development of cement bonding. It is generally accepted that the presence of organic matter in the clay acts to the detriment of strength of lime stabilized clays. The influence of the organic matters on the lime reactivity is attributed to the retardation of pozzolanic reaction. The organic matter is usually partitioned into three main fractions as humic acid, fulvic acid and humin. An experimental program was conducted to investigate on strength and microstructure of the stabilized clay. In order to understand this effect, the test had been conducted on the very soft Ariake clays, collected from different areas in Saga plain. To obtain the clay sample containing different humic acid, the tests were realized with inorganic clays mixed with the various humic acid contents.
2002-11-01