|Title: ||Grouting as a mean for repair earth constructions|
|Authors: ||Silva, Rui|
Oliveira, Daniel #
|Issue Date: ||1-Mar-2010 |
|Host Document: ||6ºATP/9ºSIACOT|
|Conference: ||6ºATP/9ºSIACOT date:1 March 2010|
|Abstract: ||(Framework) The structural damage often found in earth constructions, can result from several factors and agents. Nevertheless, earthquakes are often object of great concern among the researchers dealing with this construction typology. In fact, strong earthquakes have a very high destructive effect on earth constructions, e.g. the complete destruction of Bam city, in Iran, during the 2003 earthquake, where adobe was the predominant construction typology.
Several reasons contribute to the vulnerability of earth constructions, such as the low strength and fragility of the material and the overall high dead-weight. The fragile and weak connections are repeatedly appointed as the main reason for their collapse. Furthermore, their seismic behaviour problems are increased if the cracking is introduced by other decay agents, as for example, structural deficiencies and foundation settlements, are present. Cracking reduces the structure overall stiffness, especially if the cracks are localized in the connection between walls. In order to recover the initial stiffness of those constructions, repairing measures are required. Reconstruction of the damaged areas is an often applied solution. For new constructions this is a reliable solution. For historic constructions it is questionable because the identity of the construction can be deeply changed. Grouting can be used as an alternative repair solution for cracks in walls and damaged connections, on precondition that the compatibility of materials and durability are respected, since it is an irreversible solution. Therefore, mud based grouts seem to be the most suitable choice regarding these concerns. Moreover, grouting can also be used as complement of other strengthening solutions, like application of ties, and filling of voids and gaps in order to prevent further decay by, for example, water infiltration.
(Background) In the literature concerning the conservation of earth constructions, studies and trials of mud based grout application for consolidation of earth constructions can be found. Nevertheless, the knowledge about these grouts is very limited. Therefore, mud grouts are still to be explored in order to have a proper design methodology developed. The reactivity to water of the active element of earth (clay) is a major drawback and brings great difficulties and problems to the grouts formulation, where five parameters are at stake: rheology, stability, shrinkage, strength and bond. The relationship between them has to be studied in order to allow the development of mud grouts embracing the requirements that can lead to successful grouting interventions, and to access their limitations.
(Paper objectives) This paper aims, in general, to contribute for the development of compatible grouts for the repairing of Earth constructions. It will present the first results of an ongoing experimental research concerned mainly with the study of the grouts rheology, and bond development between the grout and the original materials.
|Publication status: ||published|
|KU Leuven publication type: ||IC|
|Appears in Collections:||Department of Civil Engineering - miscellaneous|