진동이 경량기포토의 강도특성에 미치는 영향

Abstract

Problems of Lightweight Air-Mixed soil related to use in-situ soil are issued today

inhomogeneity, quality control, strength deviation, and etc. In order to solve these problems, lightweight air-trapped soil using a sand is developed. It is possible to produce a homogeneous sand at factory in quantity. Many studies have been studied on the material characteristics. It is applied for design and construction. But after cast-in-place of lightweight air-trapped soil, research related to vibration is incomplete. Thus, this study is conducted to find out the effect of vibration on the strength characteristics of lightweight air-trapped soil under curing process.

As the results of vibration test, weak vibration of 0.26cm/s and 0.42cm/s do not show any particular change of specimen shape and compressive strength. However vibration velocities of 2.01cm/s and 3.33cm/s show a settlement and decrease of compressive strength of specimen. In order to prevent quality decrease, when lightweight air-trapped soil is applied a construction site, several construction standards should be necessary. Thus this study suggests construction standards about time when vibrated and vibration velocity.

First, it is suggested that the vibration is limited about five hours at construction site. Also in case of 6kN/m3 and 8kN/m3 of unit weight, vibration velocity of 1.2cm/s is the maximum allowance velocity. In case of 10kN/m3, the maximum allowance velocity is 0.6cm/s.

In conclusion, if lightweight air-trapped soil is applied construction site, in order to prevent quality decrease, special caution about the vibration existed construction site is needed.