By david, February 24th, 2013,in Arts, Rehabilitation Art | 4 Comments »
The current state of the designing is regular, but with input brief, medium and long term can be consolidated and perpetuated for generations to come.
The journey possess historical value and architectural, its current use is personal, and century designing is the twentieth century.
It was built during the government of Gerardo Machado (1925-1933), which accelerated and performed functions of monumental character such as this, but with regards to the work of study, he impregnated a stamp of horror and prisoners pinera entire population.
Identified like the Panopticon, most contemporary in every of Latin America, the work was more ahead of its amount of time in regards to construction techniques, since its inception as a work of architecture.
When using the idea of applying a rehabilitation to restore life, it is needed to apply the action phase, inside the case of mezzanine strengthened cement which are at an early stage, and then the moderate phase, converting big classrooms, spaces smaller (capacity twenty students).
The acting in the mezzanines are: actions to fix, rebuild, and design and safety.
Within the work filled all tabs CENCREM inspection (Nationwide Centre for Conservation and Restoration of Monuments), which concerts an analysis with the degeneration factors.
We conducted a preliminary diagnosis by constructive levels, examining each element, pathology, possible causes, and these causes summarizing integration and tiered pathologies.
The attributes of the lesion which has largely slabs covering floors and is very characteristic of this kind of home construction consisting of protected concrete and the degeneration inside the abofamiento as well as in many cases inside the cement spalling being within the last case, the reinforcing steel sight, usually corroded.
The adhesion of concrete with metal is missing and appreciate corroded steel pubs because paciguante missed his protective covering of steel and corrosion possess penetrated.
But often there is located at the same point of injury, but appears in each venue where the slab rests for a aim nonspecific and not constituting a big percentage that it detachment abofamiento thus although there are causes, consequences have straight-forward solutions.
Appreciable symptoms: abofamiento, detachment of the cement (below the steel) and metal taverns (below) to see, appreciate corroded and rusty, yet not within a big percentage torn and areas are truly small relative to the lighting have slabs.
Frequency: In most slabs, in small areas and not wearing a specific aim inside the same, but their locate is arbitrary.
Causes: The action of weathering, poor quality of construction supplies, chemicals, coatings leaks and limited.
The trusses are protected from the outside by the environment cement, and really is the basicity on this sits the well-being of those.
The oxygen in the air, water and carbonic anhydride, strike iron, it oxidizes at a much high speed, the more acidic the earth.
The concrete material is very porous and their carbonated lime could easily be air with CO2, thereby that the pH of the concrete, whose normal value is around twelve to 13, may decrease to 8, placing the steel in precarious defense.
The amount of the oxide formed is 8 occasions greater than the steel from which it originates, causing cracks and detachment below the surrounding concrete. The splits experience the same design that the main reinforcement.
Corruption of cement deterioration, possess been given by the end result of the action of aggressive agents along more than 72 years, since it is a heterogeneous information comprising the chemically active material (the binder: portland cement), material inactive (dry) and liquid, coupled with poor delivery of its combine bad style due to poor technical control during the time it took to try to do the work, and the phases of make of concrete (technical rigor) and cured (important for representing), and the insufficient suitable impervious helped to accelerated deterioration, with the following chemical phenomena: Hardened cement attacked chemically by a option process, by chemical decomposition and simultaneous action of both effects (by releasing Lime its mortar). Dissolution process: H2O hardened cement assaulted causing the leaching of lime, due to the cushy water. The rain water brought the dissolution and following leaching of complimentary calcium hydroxide, which over time possess led to the decomposition of silicates, aluminates and ferrites until all of the lime has been extracted and hydrated product remains as a residue on silica, alumina and ferric oxide hidratad, wealthy in water and without having any resistance.
The soluble calcium bicarbonate is causing the sealing impact disappears and reacting ingredients actually in rich areas, causing new responses whenever there is liquid.
Another agent which is the sulphate present within the water in some locations raise the response, the powerful salts in groundwater during the time of organizing the sulfates brought to respond, producing the development of gypsum and calcium aluminate trisulfa, causing expansion and destruction of the concrete, which together with gypsum cement aggregates and groundwater can increase their existence (trisulfa-calcium aluminate).
The presence of other sulfates for example sodium and magnesium, contributed to its degeneration, and to share important magnesium chloride, seawater will be to feel used at certain times of performance.
Actions: Inside the initial aspects are: slabs supported on various sides, as well as in 2 using instructions, whose principal reinforcement is actually 2 guidelines, the steel utilized is 12 mm, no appreciable if the entire bottom reinforcement braces reach , if any component where the steel is cut or have bayonets because landslides are happening at a 3rd of the light. The bars can be saved brushes cleaning with steel wires, and there is existence of poor quality cement rocks appreciated settled at the bottom degree fixed by deficiency of large disintegrations. No presence of arrows, or pushups on existing slabs, nor bending moment, or failure during the aids.
The rooftop deck enrajonado based, and soldering with poor condition, flooding in certain areas, absence of primers and pending for disposal. The boards have erosion problems between racillas and waterproofing problems parapets, and rainwater hoppers without protecting mesh.
So you have to submit to demolish entire enrajonado and soldering, as this cause possess affected all constructive elements.
Rehabilitation: It is necessary to proceed in removing all coatings which are loose or detached within the whole section of the slab who is flabby, cleaning the steel with cable brush and hammer (in our case does not surpass 20%, or slabs, or stairs.)
Using on roofs of slabs balconaduras antacid antacid and mortar joints.
Entire cover needs to be lifted and clean the concrete amount put, placing a film of felt, an asphalt-impregnated felt layer, putting a film of asphalt mortar, mortar for racilla spot, and after the racilla destination through a good fade.
Loose cement needs to be coated through a mesh-type chicken and provide berths or metal welding in view, and then apply a covering of items like SIKA, oy applying a mortar projection (genite-shatconcrete), big occurrence, utilizing and immune cement cannot be applied with water glass, hot or cold applying with a brush in several layers on the cement surface to be guarded.
This kind of work is truly the only way to keep the old Presidio good model, become one of their vessels in elementary school, so they conserve their slabs.