On concrete and mortars

In the article "On the pre-stressed reinforcing bars highway bridges" ( "Construction and real estate" № 18, 16.04.2002, pp. 6) brought the hard way prefabrication reinforced concrete bridge beams with regard navivky perednapruzhenoyi strings (high-wire) in the ribs on the sets of beams pair of internal final and intermediate anchors suggested by the authors. This consistent reinforcement layers are formed symmetrical and asymmetrical stretches napruzhuvanoyi threads by patent number 3672 RB, shifted relative to each other in the even and odd layers of sutures. In the known technical solution "Belhyprodora" reinforcing 15 m bridge beams made of three separate beams located at different altitudes on the cross beams.

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Post Alex Tymoshenko (ICHSP "plant Shyurynh-concrete"), issued on scientific and technical seminar "Chemical additives in concrete. Energy efficient technologies. ICHSP "Shyurynh-concrete factory was established in Minsk in 2007 and produces high quality concrete. It is stationary and mobile mixer settings in Germany, Austria, Luxembourg, Norway, Bohemia, Poland and Belarus, precast concrete plant in Dresden. (In Germany itself the attention of the company Schuering 1990) Today, all the concrete used in construction in developed countries, including various chemical additives. Traditional and new chemical additives that are introduced as a stage production of cement, and on foot concrete mix, stimulate progress in the production and laying of concrete. This is the primary problem of compatibility with modern additions tsementami. This is done to directional regulation rovaniya properties of concrete mixtures at the stages of preparation, transportation, laying and curing concrete. In the Belarusian market ICHSP "plant Shyurynh-concrete offers new additive PantarNit Rc360.

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In recent years the annual production of concrete for monolithic building in the world exceed a half billion cubic meters per year. In terms of production and consumption of monolithic concrete way ahead of other types of construction materials. In most developed countries index number of monolithic concrete use per capita is: in the U.S. - 0.75 m 3 in Japan - 1.2 m3, in Germany - 0.8 m3, Italy - 1.1 m3. In preparation for the concrete monolith construction consumes more than half of world cement production. Last 20 years monolithic way of production of concrete works actively used in the construction of tall buildings, including building-record. There Taypyeye (Taiwan) last year built the highest building in the world: over 101 meters high 455 plus spire, which building height is 508 meters. Seismic zone, prone and more of the typhoon. U area facilities in the building - 200 thousand m2. Unique feature - stalezhelezobetonnyye columns that bear. In the course of construction set a record height of pumping concrete in the column - 455 meters. Taiwan's record may not stand in 2008 when the skyscraper will be built in Dubai (UAE), whose height substantially above Taiwan. This building was designed by the American cat-fish, which is known for numerous projects implemented skyscrapers with steel framing, including Syers skyscraper in Chicago that more than twenty years owned the world record height - 442 m. Structures that are in Dubai are designed with high-strength concrete. Provide cross-resistance of buildings in the form of a trefoil, as well as central and peripheral barrel stiffness.

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European Committee for Standardization CEN was established to develop European standards. His stock are various technical committees, including on concrete and reinforced concrete: TC 51 - Cement, TC 104 - Concrete and its component materials, TS 154 - "Fillers for Concrete", TC 229 - prefabricated concrete products and design, TS 250 - Calculation and design. Now on the agenda - the creation of a unified system of European standards, mandatory for use in all countries - EU member states. Some are already achieving.

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Founded in 1909 the company Master Builders, Inc. (USA) is one of the leading innovators in the design, manufacture and marketing of chemical and mineral additives to concrete mixes used in a monolithic, or when prefabricated concrete construction. Currently, the company headquarters is located in Cleveland (Ohio), is part of an international group Degussa Construction Chemicals. A few words about one of the suggestions Master Builders. It is known that concrete has little strength in the stretch - on average about 10% of compressive strength. Portland - the most common type of cement - when setting gives shrinkage that causes usadkovyh cracks. Is it possible to reduce the number and size of cracks that cause the appearance of concrete and causing its collapse (in the crack into the water freezes, and the crack grows)?

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Dedicated to Professor J. M. Sebnisu (Hauardskyy universtitet, USA) 27 th Annual Conference "Our World In Concrete & Structure "(" Our world in concrete structures ", OWICS) held 29 and August 30, 2002 in Singapore in the hotel New Otani, specially designed for such events. Subject upcoming conference - "Concrete for Sustainable Development. Among the sponsors of the forum in Singapore - The Association of Engineers, designers, suppliers Association finished concrete mix, the Singapore Concrete Institute, Society perednapruzhenyh industrial concrete structures Asotsyatsyya cement producers, the Association of macadam suppliers, Shidnoaziatskyy Institute materials, as well as Singapore section of the American Concrete Institute. Among foreign - California, Nevada and Washington sections, ACI, Section Aci-maharashtra (India), Malaysian Society of concrete, the British Society of concrete Honkon hskaya association repair of concrete and reinforced concrete structures, Indian Construction Association, the Indian Concrete Institute, International Institute for repair of concrete and concrete designs, Indonesian Society of Civil Engineers, Japan Concrete Institute, Japanese perednapruzhenoho Concrete Association, Malaysian Association of Suppliers finished concrete mix and the Institute of Building Structures (USA).

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March 12 in the framework of the international exhibition "Stroyimpeks-98. Furniture-98 "Minsk Ltd. Farbeks, which represents the interests of Belarus in the Czech LLC Stahema Colin, and laboratory modified concrete BHPA was organized and conducted a seminar on" the use of additives produced Ltd. Stahema Colin "in the manufacture of concrete and concrete products and structures. Director, "Farbeks" In. N. Rachevskyy presented concerned the audience consisted mostly of Belarusian builders and manufacturers of building materials, products and structures, the head of the Laboratory of modified concrete BHPA N. L. Poleyko and Senior Scientist Laboratory A. A. Drozd and deputy director of the Stahema Colin "Marketing V. Chizhek and technology firms I. Fiedler. - We work with Stahemoy has about six months - said N. L. Poleyko - and this time bibliotecarul D supplements was developed by the company directly at our laboratory: we have already experienced. The meaning and our work together, and this workshop is that we continue vyprobovuvatymemo additives that you invite, and give you recommendations in our laboratories accredited for testing concrete and concrete mixes. We not only tempt chemical additives, but also develop all kinds of technology selection structure concrete production vibropresovanyh concrete products. - All Manufactured firm Stahema "additives, - said I. Fiedler - can be subdivided into the following groups: plastifikatsyonnyye, and Air Entraining vozduhottalkyvayuschye and materials for repair of concrete and additives that affect the speed of their setting.

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