Effects of High Temperature Curing Histories on Unconfined Compressive Strength of Foamed Mixture Lightweight Soil and Its Soil Structure

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  • 高温養生履歴が気泡混合軽量土の一軸圧縮強さとその内部構造に及ぼす影響
  • コウオン ヨウジョウ リレキ ガ キホウ コンゴウ ケイリョウド ノ 1ジク アッシュク ツヨサ ト ソノ ナイブ コウゾウ ニ オヨボス エイキョウ

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Abstract

Lightweight embankment technology is increasingly being accepted for use in construction projects to solve soft ground problems. The most important advantages offered by this technology are reduced foundation soil improvement costs and reduced construction period due to the reduced loading on the ground. Previous work has shown the maximum temperature inside field test bodies ranged from 80-100°C, and the unconfined compressive strength of core samples of foamed mixture lightweight soils did not reach the design strength. At this time, we have focused on the effects of ternperature increase of fill induced by cement hydration on the unconfined compressive strength of foamed mixture lightweight soils at a construction site. This paper describes the influences of high temperature under curing on unconfined compressive strength and structure of foamed mixture lightweight soil at constant volume. We found that unconfined compressive strength decreases significantly from 20 to 90°C. The unconfined compressive strength cured for 28 days at high curing temperature (80 to 90°C) is about 50-60% that of specimens cured at 20°C. The influences of high temperature under curing on the structure of foamed mixture lightweight soil at constant volume are also investigated.

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