Page 236 - 360.revista de Alta Velocidad - Nº 5

López-Bachiller Fernández, Miguel. Sampedro Rodríguez, Ángel. Díaz Minguela, Jesús.

which originated many collapses in the platform, built two years earlier, at the time of the
Subballast layer prior to placement of the track.

Photo 3 Stabilizing the platform in Zaragoza

The solution adopted was stabilization with cement, dry way, through the upper 30 cm for this
platform providing the rigidity that lacked the floor of the platform only in the sections where
the soil failed.
Before, they made some tests assuring that there were no SO3 problems in the soil.
The reparation was made very quickly without disturbing the rest of the works.

• Drying the final platform in the high speed line Madrid ‐ Valladolid, in Olmedo
The 2002 winter rains soaked the entire platform of the work in this, which put into question
the delivery from the stretch of corresponding work. That was the reason why it was decided to
dry this platform by applying a small amount of quicklime in the most humid areas in the upper
50 cm platform getting the goal within a few days.
The only control they had to do was to check the final humidity and the compaction of the layer
before setting the last one.

4. Conclusions

Soil stabilization is a solution to be considered in areas where for any reason the soil has failed
or prevents to proceed with the work under the contracted deadlines.
The reason to choose the binder in each case is not its cost but the greater or less affinity with
the type of soil that we have in our jobsite. The action of each binder is different in hardness
and the speed is achieved. In soils with plasticity index greater than 15 we should better us
quick lime as Binder but soils with Ip rates below 20 is usually recommended to use cement.
(For materials with Ip between 15 and 20, would have to see other parameters).

234 360.revista de alta velocidad