About Contec ApS and Contec International GmbH

The technical staff and management of Contec ApS have a long theoretical, practical and commercial experience with High Performance Concrete, Ultra High Performance Concrete, Heavy Reinforced High Performance Concrete and Heavy Reinforced Ultra High Performance Concrete in various business area's during more than 25 years.

 

The role of Hans Henrik Bache, researcher during his whole professional career, as a pioneer in the development of HPC, UHPC and HRUHPC is of great importance for both the concrete history in the future and our history. His important role finally starts to be recognized by others. For us, Professor Emeritus Hans Henrik Bache is a continuously source of inspiration and an enthusiastic supporter of all we do. Professor Pierre-Claude Aïtcin from the University of Sherbrooke wrote in his highly recommended book High Performance Concrete the following observations: “The first interesting results obtained by the Scandinavians in usual concrete, the very impressive discoveries of Bache and co-workers in Denmark and a significant research effort in the early 1980s in several other countries, resulted in the rapid acceptance of silica fume as a supplementary cementitious material for concrete almost everywhere in the world in less than 5 years.” and “In fact, Bache’s work showed that the ultimate compressive strength of concrete depends not only on the quality, quantity and efficiency of the cementitious materials used, but also on the degree of compaction and ultimate porosity of the solid matrix formed after the hardening process is completed. About 100 years after first being proposed (Féret, 1892), the w/b law concerning compressive strength can be said to have been extended!”. We especially like to thank Hans Henrik Bache, a great engineer and scientist but also a good motivator and a visionary, for his interesting lessons during all those years and his inspiring comments and advice, it is a great honor for us that we are able to help to make some of his more than 25 years old dreams come true. Without his pioneering work and his discoveries we never could reach the point where we are now.  

 

1960's - 1970's 

 

Aalborg Portland initiates research work with the purpose of developing cement-based materials with ultra high strength and durability. Around 1964 the first research started in the Concrete and Research Laboratory in Denmark to investigate the possibilities to produce a soft cast concrete with a higher compressive strength. The strongest concrete made had a fc of about 60 – 80 MPa with a w/c ratio of 0.30. Three important questions raised during research had to be answered:

  1. Is it possible to reach a much denser packing in cement paste than corresponding to a w/c ratio of 0.30?
  2. Will this, when possible, result in a much higher strength?
  3. Could a much higher strength than be utilized in concrete?

 

Treval C. Powers from the Portland Cement Association reports about strengths of about 280 MPa in small specimens of heavily compacted cement paste, indicating possibilities to achieve much denser packing of cement, and through this, higher strengths.


In the period 1967 – 1972 more investigation was made in the combined action of pressure and vibration to compact concrete. It was with this process possible to improve the concrete qualities and also to produce low cement/ high amount of aggregates mixes with a fc of 100 – 130. Based on the classic theory (Griffith, 1921) for the tensile strength of brittle materials Bache made his model of strength for brittle materials built up of particles joined at points of contact.

 

Around 1970 Stephen A. Brunauer from the Portland Cement Association developed a special cement containing surface active substances added during the grinding process which eliminated the attractive surface forces in cement/ water mixes. Research with the “Brunauer” cement started in Denmark in 1971 and large concrete objects were made. Brunauer was never able to produce a concrete and visit the research lab in Denmark interested in the Danish experiences. Bache suggested to use the same quantity by volume of cement paste instead of the same quantity by weight as Brunauer, which requires 50% more cement, and Bache was thus able to produce concrete.


In the same period synthetic surface active agents, the so called superplasticizers, were developed. In Japan concrete structures were build with a fc 90 MPa in the middle of the seventies. Hattori made soft cast concrete in the laboratory with a w/c ratio of 0.25 and a fc up to 120 MPa.


In 1977 the DSP technology - Densified Systems containing homogeneously arranged ultrafine Particles - is developed by Research Engineer Hans Henrik Bache. The DSP technology forms the basis for producing a new range of cement based products with extraordinary properties related to the extreme density of the matrix in terms of hardness, strength, impermeability, wear resistance, impact resistance, chemical resistance and ability to withstand repeated freezing and thawing cycles. Bache presents his very impressive discoveries on the second international conference on superplasticizers in concrete in 1981 and shocked the concrete community which still had trouble to produce a 25 tot 30 MPa concrete in the field.


1980's - 1990's


In 1986 Compact Reinforced Composite (CRC) is developed by Hans Henrik Bache. CRC is a very strong and stiff composite material with exceptionally high ductility. CRC is build up of strong, densely arranged main reinforcement in a strong, rigid and ductile matrix of UHPC.


In 1993 Contec ApS is founded to be able to solve various problems with the original DSP concrete and to develop a new range HPC like selfleveling, fast setting and shrinkage compensated mortars and a large range of products between HPC and UHPC. Contec ApS also developed the heavy reinforced HPC and UHPC for different applications like industrial floors and ultra thin white toppings.

 
Contec ApS supplies with great success Secutec materials for thin and light barriers to the leading  manufactures in Western Europe in the security industry. New compositions and reinforcement principles are developed and patented.


Contec ApS develops a new generation of semi flexible wearing courses named Confalt and supplies this in silo systems in cooperation with different production facilities to the large road contractors in Western Europe.

 

The Contec Ferroplan®  is further developed and is widely used as an overlay in locations were no normal topping can be placed.


Contec ApS starts an unique large research project in the Netherlands to develop a new revolutionary application for the Contec Ferroplan®. The Contec Ferroplan® is used as a wearing course (60 - 100 mm) on orthotropic steel bridge decks and is extending the service life of the total construction by solving fatigue problems in specific deck details. Project initiator is the Civil Engineering Division of the Dutch Ministry of Transport, Public Works and Water Management in close co-operation with Contec ApS, the founder and designer of the Contec Ferroplan®, the Delft University of Technology, TNO Building and Construction Research and various contractors in the Netherlands and Germany. 

 

2000's

 

The Confalt semi flexible wearing course is very successful placed in large projects all over Europe.


Contec  Secutec materials has reached the highest class in the security industry, class 6 what was never reached before by any other supplier and with any other material. Contec ApS supplies Secutec for the largest vault in Europe (dimensions 17 x 25 x 7 m).


In 2002 Contec ApS supplies the UHPC for the prefab panels for the Kaag bridges in the Netherlands, the first CRC application in civil infrastructure.


In 2003 the Contec Ferroplan®  is placed on the Calandbrug in the Netherlands as an Pilot project for the rehabilitation project of orthotropic steel bridge decks.


In 2003 the Contec Ferroplan® is placed on viaduct Wilp (A1/E30) in the Netherlands to re-strength the existing structure and to upgrade the capacity from 2 times 2 traffic lanes to 2 times 3 traffic lanes (1 traffic lane in each direction is a rush-hour lane). 


Contec A.P.S. de Venezuela C.A. won a bid for all the toppings in the new to built largest abattoir in Latin America. Due to problems with the concrete sub base like joints and thin slabs 90% of the job was made with the Contec  Ferroplan®.


In 2005 - 2008 the Contec Ferroplan® is placed on two large orthotropic steel bridge decks in the Netherlands. The Moerdijk bridge in the A16 with a total surface to rehabilitate of 32,000 m2 and the Hagenstein bridges with a total surface of 8,400 m2.


In 2005 the Contec Ferroplan® is placed on viaduct Voorst (A1/E30) in the Netherlands to re-strength the existing structure and to upgrade the capacity from 2 times 2 traffic lanes to 2 times 3 traffic lanes (1 traffic lane in each direction is a rush-hour lane). The Contec Ferroplan® is for the first time placed on an actual job with a slipformpaver.


Contec A.P.S. de Venezuela C.A. won large flooring contracts in the automotive - and food processing industry.


In 2007 the Contec  Ferroplan® is placed on 6 concrete viaducts ( N37/ A37) in the Netherlands to re-strength the existing structure and to upgrade the capacity. The Contec  Ferroplan® is placed with a large slipformpaver.


The Contec  Ferroplan® is placed in Germany on large industrial pavements for the collection of steel scrap and steel waste. The large joinless pavement is according to the strict German regulations regarding protection of the sub grade to avoid pollution.


Contec ApS developed a new semi-flexible pavement and flooring system, MonoConfalt®, that can be reinforced with fibers and/or welded mesh reinforcement.

 

In 2007 Contec International GmbH is founded to promote the range of Contec products in Germany and Switzerland and to give support to our customers in both countries.

 

In 2009 the new Danish Radio concert hall in Copenhagen, designed by the famous French architect and Pritzker prize winner Jean Nouvel, is inaugurated by the Danish Royal Family. The floors are made in the new developed MonoConfalt and stairs and prefab panels on the outdoor passageway are cast in UHPC supplied by Contec ApS.