The Spanish urban patrimony is formed by many buildings and auxiliary structures that are about to reach their design life. It is necessary to invest in their strengthening and restoration in order to recover their functionality and safety. One of the alternatives used with this purpose nowadays is the spraying of cementitious materials. Despite the great potential of the technique, its efficient applications is still limited. The available knowledge about the materials, the procedures and the structural design does not allow the execution of a single strengthening layer that fulfils all requirements established. In this context, the project MAPPU aims to achieve a substantial scientific and technologic advance in the strengthening with sprayed cementitious materials, increasing the global sustainability regarding the conservation of the urban patrimony. For that, 4 research lines should be addressed: - Improvement of materials through the use of more sustainable sprayed lightweight concrete or mortar with low permeability and low shrinkage -Development of models that take into account the specificities of the sprayed material in the optimized design considering creep and bond with existing steel reinforcement -Improvement of quality control procedures used to evaluate the properties of the sprayed material (especially short term properties) -Proposal of durability models that allow an integrated desing of the resulting structure considering both the previous structure and the restoration. The main objective of the project is to propose a new strengthening methodology through spraying that should be more compatible with the boundary conditions and the requirements of each application. As a result, problems related with the deterioration of the materials and the safety of the structures would be reduced. Furthermore, new constitutive models that are not available for the design of the sprayed layer will be proposed, thus decreasing expenses of materials and the use of natural resources. Moreover, new method will be developed for the assessment of the evolution of mechanical properties of the sprayed material, enhancing the efficiency and the quality of the applications.
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Programa Estatal de I+D+i Orientada a los Retos de la Sociedad
Retos de Investigación: Proyectos de I+D+i
Gobierno De España. Ministerio De Economía Y Competitividad, Mineco