Sanatsiya — improvement of a design in the conditions of adverse ecology

Continuing conversation on "sanitation" ("Building" #27), we already know, that especially in the conditions of adverse ecology and a local climate facades of buildings suffer. The basic problems of facades concern – painted plots, vyisolyi, biocorrosion traces (settlements of fungoid colonies and even seaweed on socles and above), and also otsloenie a paint or a facing tile.

We suggest to consider in details both problems, and their decision.

Vyisolyi it is possible to classify forthe several reasons of their occurrence. vyisolov it is possible to name an occurrence principal cause karbonizatsiyu. So, being porous, concrete and a cement-sandy solution well absorb carbon dioxide, oxygen and water. As a result izvest, formed at hydration of cement and creating silnoschelochnuyu environment (concrete and solutions on cement have rN 12-14), it will be neutralised by formation of a carbonate of calcium that leads to decrease schelochnosti so, to corrosion of concrete, a solution and steel armature. Other reason vyisoloobrazovaniya is effect of salts of sulfuric acid. This process has received the name of "sulphatic corrosion». As a result of effect of sulphates on tsementosoderzhaschie structures are formed new products outside and in the concrete structure which formation leads to volume increase that involves formation of cracks in concrete and the subsequent break of a design. And, at last, last from principal causes of occurrence of salts on a surface of designs it is necessary to name effect of chlorides. More often chlorides get on a surface of designs in the form of solutions of the salts used for struggle with naledyu on roads, and also with water zatvoreniya which usually take from a waterpipe, and it is, as is known, hardly chlorinated. As a result of reaction of chlorides, alkalis and amorphous quartz alkaline silicates which increase in volume under the influence of an atmospheric moisture are formed and are the reason of formation of cracks in which are appreciable typical white begin to flow. All these of corrosion, apparently from the aforesaid, not only lead to loss of a satisfactory decorative kind of structures, but also are capable to lead to early destruction and covers, and a design.

Now from corrosion technogenic we will pass to biocorrosion. This term name effect of destruction of designs products of ability to live of microorganisms, fungi, mosses, seaweed. A main condition of settlement of these representatives of flora and fauna on designs is the moisture. Humidity of those parts of designs which are in immediate proximity from a ground (it was above mentioned capillary podsos waters) is especially great. Therefore often mould, mshaniki and green islets of expanding seaweed it is possible to find out on socles. Also it is necessary to note ability of parasites to get deeply in a design and there also to conduct the "blasting" activity. Therefore design treatment is necessary as a result of a message long, using structures as for superficial, and deep etching.

And by the last item of loss of decorative effect of facades it has been designated otsloenie a facing layer (a paint or a ceramic tile). Usually such destructions arise on socles. At once it is necessary to tell, that the socle is vyivetrivatel a base moisture so, should be executed from "breathing" materials. The steamproof cover in the form of colouring or a ceramic tile does not give possibility to a socle to execute the direct appointment. The moisture as a result freezing under facing, increasing in volume, wrings out the cover, stirring to a socle to "breathe". It is necessary to notice, that in cases when facing on a socle all the same is pasted reliably, there can be problems of other sort: the moisture is lifted upwards, walls dampen, there are biodefeats and there is a stable smell of dampness and decay in premises, plaster over a socle collapses and with the course of time destruction of protecting designs is possible.

In Open Company «New construction material» special sanifying mixes on the cement basis, called to solve all problems set forth above with furnish of facades and consequences of incorrectly executed works have been developed. Their two: WASCON ML11 – a sanifying mix for works in premises and WASCON ML12 – a sanifying plaster mix for outside works. The high density of solutions defines low water absorption, so, high enough waterproofing properties, and also the raised frost resistance (not less than 600 cycles of freezing – thawing). A part modifiers of waterproof action interfere with migration of a moisture and salts in a plaster layer and do not suppose occurrence vyisolov on a surface, and also give mixes some fungitsidnyie and algitsidnyie properties (interfere with occurrence of mushrooms, a mould and seaweed). This material does not allow a moisture to be condensed on a surface, but also does not interfere with an exit of steams from a design.

The availability as a part of a mix polipropilenovogo fibrovolokna supplies high durability for solutions on a bend and a stretching and raised treschinostoykost. Presence of a fiber at a mix is responsible for one more important characteristic – high dynamic viscosity, so, skolostoykost and firmness to istiraniyu. These indicators also supply the raised resistance to early ageing and aeration of designs.

Solutions on the basis of WASCON ML11 and WASCON ML12 have magnificent adhesion to the basis (1,6 MPa) and raised tiksotropnostyu (drawing of a mix not only on walls is possible, but also on inclined and hanging elements of facades, the internal arches of arches through passage and window and doorways).

Also the accelerated set of durability is important: at the age of 3 days at temperature 18-20°S durability of solutions reaches 20-25 MPa, that allows to conduct the subsequent painting and decorating without delay. At the age of 28 days solutions have durability on compression not less than 40 MPa (mark M400).The material is granted joint venture "GROSSTROY" Source: "the Newspaper Building" #29 (2004) heading “Stroyinform”

It is introduced: on August, 13th, 2004

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