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The following articles are taken from the MC aktiv publication and curated by Buidling Chemical Supplies Ltd. Content contained is therefore the property of MC-Bauchemie Müller GmbH & Co. KG.

Nafuflex Tightens Ice Hockey Stadium

In 2011, the Ice Hockey World Championship will celebrate their 75th anniversary and will be competed for solely on the Slovakian ice for the first time. Together with Kosice, the capital city of Bratislava is one of the two venues. The ice hockey stadium here is currently undergoing an extensive reconstruction. The Nafuflex sealing system by MC-Bauchemie is being used.

The ice hockey stadium in Bratislava is known by the name of T-Com-Arena or Samsung Arena. In the future, it will be known as the Ondrej Nepela Arena and is named after the Slovakian figure skater and Olympic champion of 1972, Ondrej Nepela.

The history of the stadium stretches back to 1939, when the first public ice rink was built at the current location in Bratislava with a capacity of 300 spectators. In 1940 and 1949, it was expanded to include stands with a total of 11,000 standing places. For the European Figure Skating Championships of 1958, the stadium was equipped with a canopy and 4800 seats. The last major renovation was carried out between 1990 and 1992, when both parts of former Czechoslovakia made organisations for Prague to become a further venue of the 1992 Ice Hockey World Championships. Among other measures, the roof was renovated and the entrance hall was redesigned. The number of seats was increased to 7,463 so that the hall offered space for a total of 8,025 spectators. Since 1940, the stadium has been home to the HC Slovan Bratislava ice hockey club, which has moved to another venue for the duration of the current construction work.

Extensive Reconstruction

As part of the preparations for the 2011 Ice Hockey World Championships, the ice stadium has been undergoing an extensive reconstruction since April 2009, during which the capacity should be increased to 10,000 spectators. The end of the construction works for the 63-million-Euro project is planned for February 2011.

The rink is being completely renewed and designed in such a way that it can also be used in for other sporting activities, for example basketball. In addition, a new training hall with two ice rinks is being built, under which a two-storey car park with 300 parking places will be located. About 80% of the existing building materials have been removed from the building. Only a part of the stands with the relevant supporting constructions remain. During the demolition works, 800 tonnes of steel were dismantled, several thousand cubic metres of concrete were removed and 60,000m3 of soil excavated.

Afterwards, a new steel construction was built around the remaining stand, which supports the facade and the roof and in which the stairwells, lifts and corridors will be located that provide access to the various levels of the stands.

Waterproofing Ice Hockey Stadium

Water-Proofing where the Structures touch the Ground

When sealing all the concrete components of the stadium which come into contact with the ground, the client choose the Nafuflex sealing system. The products are characterised by their long-term cured condition long term flexibility. This creates a seamless and jointless seal, that offers the maximum protection against penetrating moisture. Even cracks in the sub-foundation, which developed after the Nafuflex had hardened, will be reliably bridged through the permanently flexible properties. In addition, Nafuflex coatings are radon-proof, preventing radioactive natural gas from penetrating the building through cracks or fissures and harming the health of the stadium's users.

The sealing work was carried out by NSM s.r.o. from Banska Bystrica, a town situated in the centre of Slovakia. Today, they have coated about 4,500 m2 of the stadium building surface and applied 20,000 kg of Nafuflex. As the work also took place in cold conditions, Nafuflex 2K-05 was used among other materials. This two-component thick bituminous coating is particularly suitable for use in the winter months due to its cryoscopic additive and can be stored in temperatures of 5°C.

During all building phases, Robert Kovacik from the Slovakian branch of MC-Bauchemie s.r.o. was there to support the company.

MC products will also be used in the next constructions phases of the Ondrej Nepela Arena. The plan is to coat another 4000 m2 of flooring, which comes into contact with the ground, with Nafuflex 2K-SP-SG. This is a two-component polymer modified thick bituminous coating. In addition, the finish of the concrete surfaces at the entrances to the spectator areas will be provided by MC Quicktop fine filler.

City Within the City

The New Residential Complex 'Marina Mokotow' in Warsaw

Right in the centre of War-saw, in the historic area known as Mokotow, a new residential area - a kind of 'city within the city' - has been under construction since 2003, replicating other international examples. The complex, 'Marina Mokotow', is situated in expansive open areas with its own lake. The location is sheltered from the hustle and bustle of a busy capital city, yet still close to the airport, Warsaw's commercial centre, important traffic networks and public institutions, and also to schools and nurseries. A range of apartments, penthouses and family homes of the highest standard are being built. When ready, 'Marina Mokotow' will be the largest population centre in Poland.

The investor, renowned developer Dam Development, contracted a team of international designers for the planning of the complex. Every living unit bears its individual characteristics and offers their owner a high degree of functionality and contemporary style. Cafes, restaurants and small businesses will be integrated into the complex so that inhabitants can enjoy the full range of services within the complex.

The implementation of construction works is staggered into three phases under the direction of the Warsaw company Warbud S.A. In accordance with the latest European standards every building has an underground garage. This necessitates protection against water ingress into underground areas that are in contact with the sub-soil, so as to prevent damage and deterioration.

The water-proofing underneath the floor slabs with bituminous sheeting and the water-proofing of the walls were implemented during the first phase. At that time MC had not yet been involved in the project.

These works fell into the second half of 2003 and the seasonal bad weather posed technical difficulties for the products chosen. During the course of the construction works MC's products were again examined and it was decided to let MC carry out the remaining water-proofing of the project. The deciding factor was that the products from the Nafuflex-programme proved to be superior and suitable for application during the winter months. For MC this meant a sizeable order of 17,000 m2.

Thanks to the successful completion of these works and an all-embracing customer service, including the preparation of technical specifications, efficient and problem-free logistics, plus construction consultancy and training of the applicators, MC subsequently also received the contract for the entire horizontal and vertical water-proofing of phase 2. This comprises an area of 35,000 m2 and will be completed this summer. At present planning of the third phase is under way.

So far, MC has successfully water-proofed a total area of 50,000 m2, using in excess of 165 tons of Nafuflex. Wojciech Wereski from MC-Bauchemie Poland stays in close contact with all participating companies and oversees the application carried out on this major new development project.

Nafuflex: New Product Programme for a Clear Overview

For 25 years, the Nafuflex system has guaranteed a time-saving, economic and secure waterproofing of structures which have contact with the ground. Ongoing research and development led to the addition of more new products, in the meantime the supply covers all possible uses. The new structure of the Nafuflex programme now gives a clear and quick overview for the selection process.

MC has completed a use-oriented restructuring of the product portfolio for selected Nafuflex products. This involves the allocation of product groups according to the application.

Basic - for hand application

The basic category includes all the products that are applied by hand. These go by the new names of Nafuflex Basic 1 and Nafuflex Basic 2. The consecutive numbers generally show whether the product comprises a single (= 1) or dual components (= 2). So Nafuflex Basic 1 is a highly flexible, single-component. polymer-modified bituminous coating which can be trowel applied. Nafuflex Basic 2 is a superior material – like all the 2 component products from the Nafuflex range - thanks to its quick drying properties even at low ambient temperatures.

Nafuflex Store

Spray technology for machine application

The "spray technology" range includes products that can be applied by machine. Improved composition means they are adapted to the relevant type of application. For instance, the highly flexible products Nafuflex Easy Tech 1 and Easy Tech 2 were optimised for spiral pump technology. Nafuflex Profi Tech 1 and Profi Tech 2 were specially designed for airless technology. Even with long hose lengths, these products are very easy to pump and therefore enable the spraying of large areas.

"Special class" for extra safety

Nafuflex High Performance is in a class of its own and is especially used for retrospective sealing of building components. It bridges cracks measuring up to three millimetres. The improved resistance to bending means it retains flexibility even in freezing temperatures. Nafuflex High Performance far exceeds the requirements of the current rules and standards.

The new structure has been phased in since October 2010. This began with in-house training to explain the new system to MC employees. This was followed by special seminars at MC service centres where the processors were given detailed information and could watch demonstrations. 'The clear and easy grouping of the products was well received'; says Wibke Jungermann-Last, Product Manager Oxal/Nafuflex. "You noticed that everyone easily understood the logic behind it all. Let's take one example: A waterproofing is planned for the autumn and the work will be done using an airless machine. Which product is suitable here7 It's easy: Nafuflex Profi Tech 2. Because 'Profi Tech' stands for processing using the airless machine and '2' means the dual-component product that dries quickly even in colder external temperatures.”

New packaging design

Even the design of the packaging has been aligned with the new structure. The drum is kept in grey and closed with a black lid. The label with the product description is on the front. The relevant product group is also emphasised. Three pictograms are a new featurethese symbolise the method of application. The trowel stands for application by hand; the spiral represents the spiral pump and the spray gun the airless machine. This makes the new product structure easy to understand and is also applied to the packaging.

Dubai's Gleaming Tower

Gleaning Tower, Dubai

21st Century Tower, Dubai, United Arab Emirates

Leaving Dubai heading south west on the Sheikh Zayed Road to Abu Dhabi there is a 4 km stretch of road flanked by modern tower blocks of hotels, offices and shops. One of the most impressive is the 270 m high 21st Century Tower. Its pale blue glass facade gleams and shines under the Arabian sun and is often adorned with dramatic but tasteful advertisements for high profile corporations.

Beneath that exterior are 55 storeys of concrete columns and beams. Due to the high humidity often experienced in the Gulf region the gap between glass and concrete will accumulate salt laden moisture. Nafuflex 2K was selected by the consultants protect the concrete and .the all important reinforcing steel. It was primarily selected for its efficacy and ease and speed of application. MC's long time partners in the Gulf supplied and applied Nafuflex 2K as they have done on many structures in the Middle East over the past 13 years.

Skin-like Waterproofing of Buildings

MC-Bauchemie has developed a completely new generation of building waterproofing systems: the innovative waterproofing system Expert Proof does without bitumen and solvents entirely, is also hygienically harmless in contact with groundwater and clearly exceeds all requirements concerning the waterproofing of buildings. The swift drying process also ensures rapid construction progress.

Up to now bituminous sheeting or thick polymer-modified bitumen coatings (KMB) have been used to waterproof buildings as a rule. The special suppleness and flexibility of the KMB were essential for a safe sealing of mineral substrates. In order to protect the raw material bitumen, the experts for innovate waterproofing systems at MC have now found an environmentally friendly solution without bitumen, which not only meets all the requirements on KMB, but even exceeds them in many respects. Innovative EHS-technology

MC-Bauchemie Waterproofing

Elastomer Hybrid Skin (EHS) is the name of the new technology, on which Expert Proof is based. Highly flexible and therefore crack bridging, economical and extremely pressure-resistant, the waterproofing system covers the structure like a skin. The Elastomer Hybrid Skin thus fulfils, even without a reinforcing layer, the test criteria and water permeability test for bituminous and polymer sheets, specified in DIN 52123 with a mesh size of 5 mm, instead of the 1 mm specified for KMB. Even in the case of a coat thickness of only 2- 3 mm, application without textile reinforcement is safe. Expert Proof is therefore able to bridge existing cracks up to 5 mm and moving or new cracks up to a crack width modification of2 mm.

Simple and rapid processing

The two components of the elastomer hybrid waterproofing are mixed to homogeneous and paste-like filler on the construction site with a slow speed mixer. This is then applied to the wall with the t rowel or with a spiral pump when spraying. In the case of manual application Expert Proof is clearly better to apply than KMB due to its creamy consistency. The coat thickness depends on the respective type of water load. For the later waterproofing of buildings in contact with the ground, a dry layer thickness of 2 mm is applied in two layers in the case of ground moisture and non-accumulating water. For higher types of water load 3 mm dry layer thicknesses are required. The setting is carried out by hydration and drying.

Environmentally friendly and cost-saving

Whether as building waterproofing according to DIN 18195, as spray water base waterproofing or as sealing system on any mineral substrates: the new Expert Proof adheres well, dries quickly and protects against water vapour on a sustainable basis. The adhesive pull strength on mineral substrates, metals and plastics is greater than 0.4 N/mm2, on concrete even > 0.8 N/mm2 These are considerably higher values that those of thermoplastics on the basis of bitumen. The environmentally friendly contents, the high tightness against water vapour and the fast drying make Expert Proof an ideal waterproofing system for concrete structures. Time plays an increasingly important role in the construction execution nowadays: waterproofing is carried out on one day and next day the construction pit can be filled in again in layers already. Even the processing in injection procedure, possible with this innovative waterproofing system, saves a lot of time and therefore costs.

Fields of application

  • Waterproofing of below-ground base plates and outer walls against ground moisture (capillary water) and non-accumulating seepage water
  • Horizontal waterproofing in and beneath walls against capillary rising seepage water
  • Waterproofing of below-ground outer walls against accumulating seepage water and pressing water up to 3 m water column
  • Waterproofing of below-ground outer walls against accumulating seepage water and pressing water up to 3m head of water including the transition region to the concrete base plates with high resistance to water penetration
  • "Sandwich"-waterproofing of reservoirs against pressurized water from the inside, such as swimming pools, water containers, water reservoirs, in indoor and outdoor areas up to a filling height level of 10m
  • Bonding agent on existing bitumen I revision of old sealing
  • Waterproofing with special demands on the adhesive pull strength on different substrates