On concrete and mortars

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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Currently the world is building a new generation of concrete that can produce sophisticated heavy-duty construction with high performance properties. High-quality concrete usually vary a great frost, extremely high strength and low water-resistance. This provides increased durability of structures in complex operating environments. All these figures practically implemented without the use of high quality, specially synthesized chemical modifiers. Writing in concrete and mortar additives has created a real prerequisite for obtaining high-quality concrete and mortar high durability. Company Benoteh (Novosibirsk) worked in construction for concrete additives and mixtures of solutions and is the manufacturer and the official dealer of several companies in the manufacture of additives for concrete and mortar mixes them. Knowing how important today, the cost of construction products, the company provides essential economic component of building additions in concrete and mortar. Universal Supplements KMH (mineral complex chemical additive) Apply KMH recommended for concrete with high requirements on resistance, strength and water resistance. The additive provides full waterproof concrete, moreover, increases the strength (150%) and frost resistance (over 500 cycles). Fuel additives is 1,5-3% on a dry matter weight of cement. The additive is introduced together with dry komponentami, mixed in mishaltsi coercive action (mixing time should increase to 20%), then water is added zachynnennya (flow zachynnennya to reduce 35-40%). At the same concrete strength increases by 80-100%, the latter characteristics are as follows: mobility - IV group (21-24 cm), sedimentation to onusa - 19 cm, frost - 1000 cycles, water resistance - from 16 to 20. In all cases sohranyayemost mobility concrete mixture is 80-110 minutes.

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The number of energy saving technologies, construction of production includes the use of additives instead Steaming forms and shuttering in the manufacture of precast concrete and concrete. In addition to energy savings, feature besproparochnoy technology is accelerating the effect of curing concrete. By 25-30 hours required is achieved (50-80%) the strength of the product to that which rozpalubyla. In today's Russian and Belarusian markets are popular and effective accelerators, plasticizers, additives as "HYDETAL-P. (In particular, the addition of "HYDETAL-P-6" can, moreover, to replace superdorohu SNV, she neutralized resin vozduhovovlekayuschaya for road and concrete products.) Additives "HYDETAL-P" to improve frost Concrete 2-3 mark (200-350 cycles), to increase its impermeability to 2-3 mark (W 10-W16), save cement (20%), improving lehkoukladuvanist concrete mixture, to increase durability of concrete mixture (up to 3 o'clock) and avoid pits and cracks in concrete Telia. In the additives (except "HYDETAL-P-7) includes corrosion inhibitors valves. Extra "HYDETAL-P-5 - superplastifikator uskoritel + I + inhibitor group. The dosage is 0,5-0,6% by weight of cement. Concrete reaches 60-80 - interest on the second day of strength. "HYDETAL-P-5 provides a change of mobility concrete mixes with P1 to P5, increases to 300 frost cycles. Extra "HYDETAL-P-6" is used for concrete with high requirements on resistance and water resistance to road construction. This plasticizer III group, which provides mobility shift of concrete mixed with P1 to P3 without reducing the strength of the product increases the frost resistance of F150 to F300, waterproof - with W8 dow18. The dosage is 0,2-0,4% by weight of cement. The additive is introduced in the concrete mix in dry form. Extra "HYDETAL-P-7" - + plastifikator uskoritel III group - can greatly accelerate the process of curing concrete. When the outside air temperature above 10 oC and 80 per cent strength achieved in 24 hours. The dosage is 0,3-0,4% by weight of cement. Frost - more than 300 cycles. Water resistance increases by 3-4 marks. Working solution at concentrations of 10% does not freeze in temperatures to -15 ° C. All of these additives passed a set of tests in the laboratory corrosion NIYIZHB (Moscow) and have certificates Gosstroy Russia. In 2006 additions were designed complex of concrete based polikarboksylatov "HYDETAL-GP-9 alpha, beta".

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Company Silkroad Construc-tion Chemical Co., Ltd. (Seoul, South Korea) produces additives for concrete ROADCON, setting accelerators for torkretbetonov ROADCON-LA and ROADCON-LS, and steel fibers ROADCON-FIBER for concrete reinforcement used to increase strength, improve the plasticity and increase durability of concrete. Vodoznyzhuyuchi additives, superplasticizer and other additives ROADCON were recognized as manufacturers of concrete mixtures, and perednapruzhenyh prefabricated concrete products as the best. ROADCON products made from the very best raw materials and modern equipment under strict quality control. Silkroad Construction Chemical Co., Ltd. - A company that is based on twenty years of experience and modern technology. Accelerators setting ROADCON-LS and ROADCON-LA is additive, designed for quick setting cement torkretbetonah that were received for the NATM (New Austrian tunneling method) used in the construction of subways, mines and mountain tunnels. In addition, they prevent splashing torkretbetona a large pressure of the mixture. ROADCON-LS is liquid setting accelerator for wet mixtures torkretbetona - transparent colorless additive - silicate (liquid glass), the share of 1.38 g/cm3 ± 0,02 (at 200 ° C). Shelf life - 1 year after opening the container. In addition to dust removal, additive increases the compressive strength and provides good grip. And yet - a big savings (reducing shrinkage). In addition, ROADCON-LS improves the waterproof properties and does not contain chlorides. This aggressive agent. Her dosage usually is 8-15% by weight of cement.

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After the invention of Portland in England and France in a composite material - concrete - began his extensive use in various areas of construction. Currently, concrete is applied even in engineering (basic machine parts and assemblies) and shipbuilding (docks, floating docks). He actively pushed out of the steel bridge and high-rise building. But the real revolution in concrete technology occurred when a wide spread of acquired chemical additives-modifiers (literally: izmeniteli properties). During my time in Russian practice as additives were used mostly materials developed for use in other industries. In fact, first supplement, produced specifically for use in concrete, was superplasticizer S-3. It should be noted that additives in concrete technology - a means, not an end in itself. The main objective of beta onovedeniya how science can be defined as the development of methods for designing compositions of concrete to secure the operational characteristics of the material in the finished building, taking into account the different technological requirements on the stage of the work. Special need in the use of new technologies in the 60-70's was not, because almost 90% of the total concrete vypuskalosya then with the strength to 30 MPa (I22, 5), which is available on the "classical" (cement, sand, gravel, water ) Concrete tsementov using common building supplies and fillers that meet the requirements of guests. In "classical" part of the concrete strength was provided cement consumption, vodotsementnym attitude and rationally chosen ratio of fillers. In the last 10-15 years, approaches to development and destination warehouses heavy concrete change.

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Discuss progressive beginning, which is a prefabricated Monolithic frame construction, as much as possible, but the real meaning of these discussions are filled only when the regime decided to issue a monolithic concrete areas. That is why the report of the main researcher NIEPHP "BELNIYIS" Doctor of Technical Sciences Professor BHPA N. P. Bleschyka "Maloenerhoyemna besprohrevnaya technology and making monolithic concrete in summer and winter conditions, made them September 22, organic vplivsya canvas in the international conference" multi-dwelling buildings with monolithic and prefabricated monolithic frame. New Sheathing systems, technologies and experience in construction. New design of buildings that are considered today can be effective in building only if you provided an intensive and technology maloenerhoyemna construction of monolithic reinforced concrete structures. Traditsyon ment approach to aging of concrete to get him raspalubochnoy strength (a concrete frame with a span length of 6 m required to achieve concrete formwork removal, typically 80% of design strength, approximately 240 kg / cm 2) - This extract concrete opalubtsi about 14 days in summer conditions. Naturally, this reduces the reversible shuttering systems. Declining and the pace of construction.

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