Abstract
For shallow soil improvement, the hardening agents are mostly used in powder. Some kinds of powder fly up in air and are carried by wind at construction sites, and they are called dust. Recently, the flying dust has become a serious problem at the sites near residential area and for workers' health.The purpose of this study is to investigate a practical application of dustless hardening agents that contain a small amount of oil. The authors examine the amount of dust from the agents, the strength of treated soil and the amount of oil which dissolves from the soil. Furthermore, they research the reason that the dustless hardening agent has been used in relation to environmental improvement.As a result, it has been found that the new dustless hardening agent is very effective in decreasing the amount of dust produced and in increasing the strength of treated soil. And the amount of oil which dissolves from the treated soil is extremely small in comparison with the specification limit of the environmental standard. Therefore, the new dustless agent can be applied increasingly in various fields.
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