Ash concrete - the technology of production, characteristics, practical application

The variety of masonry materials It allows a private developer to choose the best option based on specific conditions. And if a couple of decades ago, the undisputed leader in private construction was brick, not only because exceptional performance, but also because of the lack of real competition, but today no less in demand various blocks. In this article we will focus on tvinblokah who have found their consumers, and among the participants of the portal FORUMHOUSE.

Ash concrete for low-rise building

Tvinblok - variety of cellular aerated (ash concrete), wherein the special composition and pazogrebnevyh compound from wall blocks. In English the word "twin" - twins, the name of the material received from the good geometry blocks from different parties have the same parameters. Due to the ash blocks characteristic shades of gray, if this is not observed, then it is not ash concrete and sand-lime aerated concrete in which the ash filler replaced by quartz sand.

Ash "twins" produced from a mixture of binder (Portland cement), hydrated lime (calcium hydroxide), fly ash (the waste from TPP), the aluminum slurry and water, the method autoclaved. When thoroughly mixed dry components are shut water, aluminum reacts with hydroxide calcium (Ca (OH) ₂), causing gas generation, resulting in the mass of porous foamed and acquires structure. Simultaneously, the hydration process of binders and a porous mass of aerated concrete hardens. The next stage is still plastic mixture is cut into blocks, the comb-shaped groove and special grippers-side recesses for the hands on both sides of the block.

Dimensional accuracy is laid at the stage of cutting, the deviation on both sides - in several process stages millimeters, and heat treatment (about 190⁰S) in an autoclave under a pressure of 12 atmospheres finally generates straight face. Autoclave provides blocks not only a good geometry, but also the homogeneity, and worthy of the physical and mechanical characteristics - strong pressure provoked reaction mass components that result in hydrate connection.

Tvinbloki available as wall - for walling and partition - for Intra mezhkvartirnyh or partitions.

• TB-100: 630h100h250 mm.
• TB-200: 625h200h250 mm.
• TB-300: 625h300h250 mm.
• TB-400: 625h400h250 mm.

From the wall blocks can build up to three floors of homes, and their use in monolithic high-rise buildings, when the supporting frame of reinforced concrete. Strength class (B) depends on the density (D, kg / mᶟ), respectively, D400 blocks belong to a class of 2,5; D500 - B 2,5-3,5; D600 - B 3,5-5. Brand frost same for all categories - F 100, the thermal conductivity in the dry state of 0.10, 0.12 and 0.15 W / (m * C).

The advantages of the blocks include low thermal conductivity, due to which the walls do not need additional insulation, if we are not talking about the northern regions. The relatively low weight, due to which the base structures do not require power, as well as acceleration and cheapening of finishing work - the walls obtain even and smooth and does not need a thick layer of plaster.

Among the disadvantages of high absorbency. As with all concrete, tvinbloki recruited moisture from the atmosphere, so the lining is not so much decoration as necessary. Demands to the base - thin seams, blocks strong but brittle on bending, the slightest bump on a foundation may cause cracking.

masonry

For construction use a special adhesive for concrete blocks, with a thin seam it provides a strong bond, due to the low flow costs no more than a DSP, and is easier to work with it. Working with tvinblokami - not the easiest process in terms of weight, pull about thirty in average D500 kilogram, but no problems with the treatment - they are easy to cut, voids armature selected Wall Chasers. The first row is separated from the foundation waterproofing layer stacking is performed after reinforcement. Manufacturers recommend groove 25x25 mm, armature cross section is selected, based on the estimated load and zoning (window-sill area Laying nets, blank areas).

Paz necessarily cleaned of dust and filled with glue, fittings and recessed fit - the glue will protect it from external influences.

Roman_AE (User FORUMHOUSE):

The first row of blocks reinforcements ten mm, in two rows.

Although pazogrebnevyh compound increases the strength of masonry, with it also can be difficult. One participant portal advises to pay attention to this point, especially when the workers hired.

olga Ermakova (User FORUMHOUSE):

Her husband understood the level of the wall, and I - with wire, monitors the quality of the fill stitches glue. It is necessary, otherwise the seams and empty pazogrebnevyh system will be felt in the winter in the form of cold air into the house.

Although there is an opposite view that pazogreben provides reliable fixation of blocks and sufficiently careful filling horizontal joints, vertical filled in the finishing process. However, not the fact that the walls are plasterers - from the inside can be clad sheet materials, and any exterior siding, many people prefer its decorative plaster and wall. In this scenario, the seams will be empty or they have to be sealed after being laid, which is also found.

korobasow (User FORUMHOUSE):

Clay flooded the central part of the masonry around the perimeter after the completion of a number, and then the wife will promazyvat seams.

As for the ceilings, with exposed beams that can easily do that, everything is standard - packing, protection against contact with blocks and mortar. But with reinforced concrete slabs by manufacturers of aerated concrete, which include tvinbloki are advised to be safe, to prevent the destruction. For this purpose a bearing is done not directly but through pre-soaked monolithic "cushion" for the entire contact area, wherein the plate portion of the wall should not be less than 120 mm. "Pillow" is filled with concrete (class 15) with reinforcing rod mesh of 10 mm thick, 100x100 cell mm and is put into the wall (longitudinal) 200-250 mm, and the insulation end providing the block layer in 140 mm. In the thermal deformations between the wall plate and leave the slot at least 10 mm. If the ends will be warmed further thermally insulating material, the horizontal joints in the rows above and below the overlap required reinforced with fiberglass (serpyanka).

Ash concrete popular by virtue of the relatively low weight and low thermal conductivity, and because of the geometry of a good and smooth surface. Also it attracts many slot connection through which is easier to bring a flat surface. A high water vapor permeability promotes natural ventilation, with proper cake facade. Together, these features make the material a worthy competitor to other species in the concrete block base. Well built out of it or choose something else, it depends on the desire and the possibilities - yet are "twins" is palpable.

For walls, you can take advantage of cheaper material tvinblokov - silicate cam boardsAnd trim accent walls are made decorative tiles under brick. Another alternative to ceramics, but not gazoblochnaya - wood-concrete panels, in an article on the website you can read, what they make at homeAnd in the video - visual support themes.

Discuss the article and read other materials devoted to country life you can on the websiteFORUMHOUSE.

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