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Concrete products



Decorative block 190
серый

30,00;нет;43,00;43,00;43,00;43,00;60,00;нет;нет;60,00;60,00;
Цена:

Lenght, мм 390
Height, мм 190
Width, мм 188
Weight, pcs/kg 16
Material riddlings, granulated slag
Choice of color

Here a decorative concrete block is presented, which you can buy in Dnepropetrovsk and other regions of the Ukraine


Decorative block 140
серый

25,50;нет;38,50;38,50;38,50;38,50;50,00;нет;нет;50,00;50,00;
Цена:

Lenght, мм 390
Width, мм 140
Height, мм 188
Weight, pcs/kg 12
Material riddlings, granulated slag
Choice of color

Smooth block 140
серый

11,10;нет;30,00;30,00;30,00;30,00;46,00;нет;нет;46,00;46,00;
Цена:

Lenght, мм 390
Width, мм 140
Height, мм 188
Weight, pcs/kg 12
Material riddlings, granulated slag
Choice of color

Masonry block 190
серый

12,20;нет;34,00;34,00;34,00;34,00;50,00;нет;нет;50,00;50,00;
Цена:

Lenght, мм
390
Width, мм 190
Height, мм 188
Weight, pcs/kg 18
Material riddlings, granulated slag
Choice of color

All our concrete masonry blocks pass inspection control, so all the products are of high quality


Partition block
серый

8,50;нет;22.00;22.00;22.00;22.00;31,00;нет;нет;31,00;31,00;
Цена:

Lenght, мм 390
Width, мм 90
Height, мм 188
Weight, pcs/kg 11/7,5
Material riddlings, granulated slag
Choice of color

Solid block 190
серый

24,00;нет;нет;нет;нет;нет;нет;нет;нет;нет;нет;
Цена:

Lenght, мм 390
Width, мм 190
Height, мм 188
Weight, pcs/kg 29
Material riddlings, granulated slag
Choice of color

Corner decorative block
серый

21,00;нет;28,00;28,00;28,00;28,00;39,00;нет;нет;39,00;39,00;
Цена:

Lenght, мм 190
Width, мм 190
Height, мм 188
Weight, pcs/kg 10
Material riddlings, granulated slag
Choice of color

Facade stone
серый

17,00;28,00;28,00;нет;28,00;28,00;нет;нет;нет;нет;нет;
Цена:

Lenght, мм 390
Width, мм 70 or 95
Height, мм 188
Weight, pcs/kg 10
Material riddlings, Granulated slag
Choice of color

Facade stone, as well as our other products pass inspection when being produced, so it has high quality.



What is slag stone?

According to established opinion, the slag stone is generally understood to be blocks manufactured by vibration pressing (vibration molding) of the concrete mixture, of which main constituents are slag and cement as a basic binder. However, today “slag stone” is the conventional name of any building blocks manufactured by vibration pressing (vibration molding) of the concrete mixture. Slag is not necessarily present; and concrete mixture constituents could be as follows: slag, stone screening dust, granite macadam, bank gravel, gravel, crushed bricks and concrete rubble, crushed set cement, crushed glass, haydite and even sand.

Usually slag stone dimensions are within the limits of 200 mm × 200 mm × 400 mm and less. There are two types of slag stone — hollow and solid blocks. Varieties of blocks are numerous: these are ordinary masonry blocks (e.g., slag stone, smooth block 140), partition blocks (used for construction of indoor partitions and having thickness of 90 mm), decorative wall blocks (decorative block 190), fence blocks (decorative block 140, corner decorative block), and facade finish blocks (facade stone), etc. All decorative blocks (including a facade stone) have one side quarry-faced surface (stone imitation); every block has an individual side surface pattern.

 

History of first blocks creation and use

Allegedly, concrete blocks have been first used in the USA as a substitute of stone or wood in house construction. The oldest known example of house built in this country solely of the concrete blocks was that in 1837 at the Staten Island, New York.

The oldest officially documented building built of slag stone is the Hermitage Garage (1910). The Hermitage Garage is the operating garage building located in territory of the State Hermitage Museum (Saint Petersburg), it has been built upon the project of architect Nickolay Kramskoy for the Emperor Nickolay II in 1911. Slag stone and concrete blocks in Dnepropetrovsk were revealed in buildings belonging to a lower date.

 The first concrete block has been developed by Harmon S. Palmer of the United States in 1890. Palmer patented that design in 1900 based on 10-years experiments. The Palmer blocks were 8 inches (20.3 cm) × 10 inches (25.4 cm) up to 30 in (76.2 cm) in size, and were so heavy that the laying required the use of small crane. By the 1905, about 1500 companies manufactured concrete blocks in the United States. At those early factories, blocks were usually removed by hand, and average productivity made about 10 blocks per man-hour. It should be noted that it is likely referred to the solid blocks, i.e., to the void-less blocks (let us remember the crane – author's note), which probably means concrete block similar to the modern concrete foundation blocks rather than slag stone.

Experience has shown that houses built of the concrete blocks enable the creative use of affordable materials. This new construction type became a popular type of house construction from 1900th through 1920th. At that time, such design buildings were often referred to as "modern" ones. Although many buildings used concrete blocks as external wall surface finish, plaster or other coatings were similarly used on the block structure. Those hundred thousand buildings were built due to the abundance of raw materials necessary for the concrete block production, such as sand and gravel. Concrete blocks were made as an imitation of stone textures: natural stone, granite or rustication. Initially blocks were regarded as experimental material for house construction. Many cement producers declared houses built of the concrete blocks in their catalogues as “fireproof, unaffected by parasitic insects and being reliable weather protection", as well as affordable substitution for structural timber amid the rise in raw material price. Many other types of buildings, such as garages, post-offices, sheds and various production premises have been built by this construction method due to these qualities, and today these continue to be built.

 

Blocks production

Blocks production consists of four principal processes: mixing, molding, steam-curing and formwork removal. Some factories manufacture concrete blocks only, while others could manufacture a wide range of precast concrete products including blocks, flat paving blocks, and decorative products for landscaping, lawns, etc. State-of-the-art production lines are capable to produce at least 2000 blocks per hour.

 

Mixing

Basic constituents for blocks manufacture (slag, stone screening dust, etc.) are stored in the special storehouses and are transported to the factory bin as needed. Cement is stored in the large vertical silos (cement barrels) in order to protect it from moisture and to avoid so-called “packing”.

At the start of production cycle, necessary amounts of basic constituent and cement are fed to the metering devices dosing the proper portions of each material.

Dry materials are fed to the stationary mixer (concrete-mixer), where these are mixed up for a few minutes.

Thereupon small amount of water is added to the dry mixture. Chemical additives and coloring pigment could also be added to the mixture if required. Mixer content is then mixed up for three to six minutes. Result of this process is earth-moist mixture.

 

Molding                                                                                            

After the preparation, earth-moist concrete mixture is fed by the inclined conveyor to the press hopper. Mixing cycle starts again with the next feed.

From the press hopper concrete is fed to the mold. Mold consists of matrix with partitions defining the external and internal block shape.

Once molds are filled, concrete is compacted under the load of upper part, i.e., punch entering vertically the mold cavity. Compaction is achieved by means of hydraulic cylinders pressing against concrete mixture through the punch. Short mechanical vibration bursts are also used for the products compaction in molding line. Compacted blocks are moved down out of molds onto flat wooden or steel pallets. Pallets with blocks are pushed out of machine and are assembled into the cassettes.

 

Steam-curing

Cassettes with blocks are fed to the steam-curing chamber. Each cassette can contain thirty to hundred blocks.

Steam-curing chamber is a closed room with a capacity of several dozens of cassettes with blocks simultaneously. Then low-pressure steam is fed to the chamber; blocks stay in chamber for 12 to 18 hours at gradually increasing temperature allowing blocks curing (initial cement setting process – author’s note). Once curing temperature is reached, steam feed is cut off, and blocks are cured in warm and humid environment. After the steam treatment, blocks are dried at reduced air humidity, and chamber temperature might be further increased.

 

Formwork removal

Cassettes with blocks are fed to the formwork removal line. Blocks are removed from pallets, which are returned to the molding machine in order to receive a new batch of molded blocks.

Blocks are passed through the formwork removal line and placed onto transport pallets, which are moved out of workshop by forklift truck and put into finished products storage.

If blocks are to be manufactured with the quarry-faced (decorative) front side, these are initially molded as two coupled blocks. Once these double blocks are steam-cured, these pass through the special splitting press halving this block by the vertically fed blade, which results in block with one decorative side.

 

Blocks use and application potential

Currently blocks manufactured by vibration pressing (vibration molding) became widely used in the modern construction. Slag stone primary advantages are high heat-insulating and acoustic insulating properties making this material ideally suited for exterior wall construction. In spite of the fact that this material is not most heat-retaining one of all presented at the modern construction material market, its low costs and rapid construction rates make this material still more attractive for much people. It is also important to note that this material is completely non-combustible. Increased hygroscopic properties are readily balanced out by the use of facing brick, which is also capable of necessary buildings aestheticization. In addition, if reinforced concrete framework is a supporting structure, slag stones could be used in the high-rise construction walling systems.

Slag stone has always been, and remains one of the most demanded materials for erection of supporting structures in construction. Its typical strength and good heat-insulating properties enable quick and relatively easy construction. Slag stone is suited for use by both professional and inexperienced bricklayer. Recently slag stone as well as other nominal size blocks, e.g. smooth block 140 and decorative block 140, became popular as material for construction of barriers (fences), building facades finishing, landscape design, construction of utility spaces (belvederes, bath-houses, etc).

Various facade systems also manufactured by vibration pressing (vibration molding) were brought to the construction material market at the same time as blocks were. In this case, these systems application range is still broader, and in the future years, these systems could put competitive pressure on other materials in market, for example, facade stone.

Ordinary concrete block keeps developing as an architectural element and urges the producers to development of new shapes and sizes, and this eventually results in introduction of new construction blocks and materials. These new blocks offer prospects of quicker and less costly construction, and result in new construction solutions featuring the higher strength and lower heat conductivity.

In order to purchase slag stone and concrete masonry blocks at favorable price in Dnepropetrovsk, please feel free to contact our consultants via the contact methods specified on website. The VUD OOO (VUD LLC) guarantees high quality of our products.

 

References cited by this article: wikipedia.org, allbeton.ru