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02218 EVALUATION, DIAGNOSIS AND REHABILITATION OF BUILDINGS IN RURAL ENVIRONMENTS

Picture for 02218 EVALUATION, DIAGNOSIS AND REHABILITATION...
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Product Number: 51300-02218-SG
ISBN: 02218 2002 CP
Author: Oladis T. de Rincon, Miguel Sanchez G, Orlando Perez, Octavio Garcia, Liana Arrieta de Bustillos, an
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The objective of this paper is to present, from the structural and corrosion point of view, an evaluation, diagnosis and rehabilitation plan for fifty-two 3-story buildings set in a complex within a rural environment. The construction system is semi-prefabricated, tunnel-type, enclosed within prefabricated no-load-resisting panels. Each building was constructed in two stages, with the two parts of each separated by an expansion joint through which the gas, water and electricity supply were piped. At the end of the first year after delivery, the buildings began to suffer from severe problems: filtration, electrical and structural failures, which increased in volume and complexity. Basically, these were due to the fact that the buildings were set up in expandable clay soils. Structural faults and corrosion were two of the many problems detected-not only of the reinforcing steel in different areas but also of the pipes embedded in the masonry and concrete. Different techniques were used for the evaluation: visual inspection; sounding (hammer); potentials measurements (ASTM Standard C-876); degree of carbonation (Phenolphthalein) and physicochemical analysis of the concrete. Results indicate that both the foundation and superstructure system were inadequate for the structural demands produced by the volumetric changes in the soil and/or continuing settlings. Besides, that reinforcement corrosion in the prefabricated panel/slabs is due to concrete carbonation, given its bad quality. This notwithstanding, corrosion in the roof and ceilings was due to the presence of chlorides in the plaster. Rehabilitation was planned in accordance with the type and extent of damage found. Keywords: Building, Reinforced Concrete, Corrosion, Repair, Rehabilitation, Carbonation, Chloride ions.
The objective of this paper is to present, from the structural and corrosion point of view, an evaluation, diagnosis and rehabilitation plan for fifty-two 3-story buildings set in a complex within a rural environment. The construction system is semi-prefabricated, tunnel-type, enclosed within prefabricated no-load-resisting panels. Each building was constructed in two stages, with the two parts of each separated by an expansion joint through which the gas, water and electricity supply were piped. At the end of the first year after delivery, the buildings began to suffer from severe problems: filtration, electrical and structural failures, which increased in volume and complexity. Basically, these were due to the fact that the buildings were set up in expandable clay soils. Structural faults and corrosion were two of the many problems detected-not only of the reinforcing steel in different areas but also of the pipes embedded in the masonry and concrete. Different techniques were used for the evaluation: visual inspection; sounding (hammer); potentials measurements (ASTM Standard C-876); degree of carbonation (Phenolphthalein) and physicochemical analysis of the concrete. Results indicate that both the foundation and superstructure system were inadequate for the structural demands produced by the volumetric changes in the soil and/or continuing settlings. Besides, that reinforcement corrosion in the prefabricated panel/slabs is due to concrete carbonation, given its bad quality. This notwithstanding, corrosion in the roof and ceilings was due to the presence of chlorides in the plaster. Rehabilitation was planned in accordance with the type and extent of damage found. Keywords: Building, Reinforced Concrete, Corrosion, Repair, Rehabilitation, Carbonation, Chloride ions.
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