A NEW PRACTICAL SOLUTION FOR EFFECTIVE USE OF DREDGED SAND - MIXTURE OF DREDGED SAND AND LIGHTWEIGHT MATERIALS

摘要

Construction of ports and offshore airports, which is now performed on a large scale in Japan, requires a large volume of materials (mainly sand) for ground formation. However, it has become difficult to obtain large amounts of pit sand from mountains because of nature conservation rules. On the other hand, dredging operations for maintenance of seaways and berths have produced a large volume of soft waste materials (earth and sand) with associated disposal problems. To recycle the dredged materials, lightweight mixtures have been developed and are effectively reused as ground material. Lightweight mixtures are now produced as artificial ground material by treating the dredged materials with solidifiers and lightweight materials (air bubbles, expanded beads, etc.). This process allows control over the density and strength of the lightweight mixtures. This report describes the present status of construction technology using such lightweight mixtures together with a practical solution