Application of Cement Treated Soil Using a Pneumatic Flow Mixing Method for Land Reclamation
Type:
Presented during:
WODCON XIX: "Dredging makes the World a better place" - 2010, Beijing, China
Authors:
H. Shinsha , Y. Okubo
Abstract: In Japan, approximately 12-18 million m3 of dredged soil is produced every year from dredging. Therefore, dredged soil has been recycled as a reclamation material and backfill material for use behind quay walls after enhancing its strength. Many methods have already been developed for the effective use of dredged soil mixed with a stabilizing agent. One of these methods is the Pneumatic Flow Mixing Method.
This paper first outlines the pneumatic flow mixing method. This method involves mixing a stabilizing agent with dredged soil while pumping the grab-dredged soil via a pneumatic barge by using the turbulence generated by plug flows within the pneumatic pipe.
The stabilization of the dredged soil using this method can be designed and executed according to the Technical Manual for the Pneumatic Flow Mixing Method in Japan. In addition, this method has the following general features:
- (1) It facilitates the supply of materials of varying strength, within a short time period, thanks to the addition of a stabilizing agent.
- (2) It facilitates rapid, mass construction due to the availability of an existing pneumatic conveying vessel.
Finally a few field applications using the pneumatic flow mixing method for stabilized soil reclamation work, the construction of stabilized surface layers on very soft ground and the construction of partition banks on soft ground are described, including the construction undertaken, construction methods, an
d the resulting quality of the stabilized soil. The pneumatic flow mixing method is effective for producing a sufficient amount of stabilized soil that satisfied the required quality (strength).
Keywords: Grab-dredged soil, stabilizing agent, pneumatic barge, plug flow, quality control