RECYCLING ON SITU - TECHNICAL AND ENVIRONMENTAL BENEFITS
Technical Articles Archives - Grupo Bitafal
Technical Articles Archives - Grupo Bitafal
This technique entered Uruguay with the arrival of the first equipment in 2013. Given that the number of roads requiring structural rehabilitation is increasing in our country, the future of the on-site recycling technique looked very promising.
This technique entered Uruguay with the arrival of the first equipment in 2013. Given that the number of roads requiring structural rehabilitation is increasing in our country, the future of the on-site recycling technique looked very promising.
From the Center for Research in Road Technologies (CITEVI) a follow-up of the first executed sections was carried out both in the knowledge of recycled materials, in the studies for the determination of its working formula, in the project methods, in its prescriptions techniques and in the follow-up of the executed sections. The good results obtained in most of the projects helped to clear up doubts of many administrations, seeing the savings that it represents compared to reinforcement or reconstruction alternatives, and they began to include this technique in the specifications.
INTRODUCTION
From the Center for Research in Road Technologies (CITEVI) a follow-up of the first executed sections was carried out both in the knowledge of recycled materials, in the studies for the determination of its working formula, in the project methods, in its prescriptions techniques and in the follow-up of the executed sections. The good results obtained in most of the projects helped to clear up doubts of many administrations, seeing the savings that it represents compared to reinforcement or reconstruction alternatives, and they began to include this technique in the specifications.
In-situ cold recycling with cement is a road rehabilitation technique with which a new base layer of notable structural capacity is achieved, taking advantage of the existing road as a quarry or a source of aggregate supply.
In-situ cold recycling with cement is a road rehabilitation technique with which a new base layer of notable structural capacity is achieved, taking advantage of the existing road as a quarry or a source of aggregate supply.
Compared to other rehabilitation solutions, recycling with cement allows the use of these deteriorated layers, managing to recover and even increase their support capacity, and provides the material obtained after recycling with physical-mechanical characteristics in accordance with an adequate level of service. the infrastructure. A much more durable overall surface is achieved, with less susceptibility to water and greater resistance to erosion. The field of application is very wide since it covers all types of roads and paved surfaces.
It is a technique closely linked to the concept of sustainability and in addition to presenting various environmental advantages, important technical and economic benefits are added.
Properties of materials recycled with cement
It is a technique closely linked to the concept of sustainability and in addition to presenting various environmental advantages, important technical and economic benefits are added.
Regarding the fatigue behavior of recycled materials with cement, a series of tests carried out show that it is similar to that of vibrated concrete or rough-cement, that is, they are mixtures with a fatigue curve presenting a very low slope. Consequently, a slight decrease in the stresses in the recycled layer translates into a large increase in its service life. The methodology of the study consists of establishing the variation of the parameters to be determined as a function of the cement dosage, the variation of the water content and the density of the specimens. In Uruguay, the first sections have been carried out looking for a seven-day compressive strength of 15 kg/cm2.
Work execution
Before recycling, it is necessary to:
- Verify the feasibility of recycling
- Define the type of recycling
- Before recycling, it is necessary to:
Before recycling, it is necessary to:
- Cement spread
- Scarification of the pavement in the required depth
- Material wetting
- Mixed
- Initial compaction
- Eventual surface refinement
- Final compaction
Before recycling, it is necessary to:
With regard to scarifying to the required depth, wetting and mixing the disaggregated material with cement and water, (that is, the equipment to carry out the actual recycling), an on-site recycler is used. In it, the fundamental component is a rotor equipped with spades, which performs the disintegration of the pavement and mixes the elements with the cement and water.
With regard to scarifying to the required depth, wetting and mixing the disaggregated material with cement and water, (that is, the equipment to carry out the actual recycling), an on-site recycler is used. In it, the fundamental component is a rotor equipped with spades, which performs the disintegration of the pavement and mixes the elements with the cement and water.
Environmental benefits
- The reuse of materials in situ contributes to not having to open new quarries or reduce the reserves of existing ones. This saving in aggregates can be estimated at about 2000 ton/km compared to the aggregate required for a new pavement with a similar structural capacity.
- The reuse of materials in situ contributes to not having to open new quarries or reduce the reserves of existing ones. This saving in aggregates can be estimated at about 2000 ton/km compared to the aggregate required for a new pavement with a similar structural capacity.
- The reuse of materials in situ contributes to not having to open new quarries or reduce the reserves of existing ones. This saving in aggregates can be estimated at about 2000 ton/km compared to the aggregate required for a new pavement with a similar structural capacity.
- The reuse of materials in situ contributes to not having to open new quarries or reduce the reserves of existing ones. This saving in aggregates can be estimated at about 2000 ton/km compared to the aggregate required for a new pavement with a similar structural capacity.
Technical benefits
- It allows to rehabilitate fatigued and deformed roads, transforming them into more homogeneous treated layers with important mechanical characteristics and much greater bearing capacity.
- The tensions that reach the sub-base are reduced
- It allows to rehabilitate fatigued and deformed roads, transforming them into more homogeneous treated layers with important mechanical characteristics and much greater bearing capacity.
- It allows to rehabilitate fatigued and deformed roads, transforming them into more homogeneous treated layers with important mechanical characteristics and much greater bearing capacity.
- It can be combined with the execution of an extension, using for the latter the same equipment used in recycling. This does not require a minimum widening width and the construction of narrow wedges that often cause difficulties can be avoided.
- It can be combined with the execution of an extension, using for the latter the same equipment used in recycling. This does not require a minimum widening width and the construction of narrow wedges that often cause difficulties can be avoided.
- It can be combined with the execution of an extension, using for the latter the same equipment used in recycling. This does not require a minimum widening width and the construction of narrow wedges that often cause difficulties can be avoided.
- The initial level is practically maintained.
- The initial level is practically maintained.
Economic benefits
- The initial level is practically maintained.
- The initial level is practically maintained.
- The initial level is practically maintained.
For inquiries or more information, you can write to us at bitafal@bitafal.com.uy
Qco. Santiago Kröger - Technical Director of Bitafal Group
