History of IPHA



From the early use of concrete, through to the development of prefabrication, prestressing, and machine manufacture.

  • Ancient Times

    Early Use of Concrete

    Buildings such as the Pantheon, built c. 126 AD by the Romans, show early use of concrete structures and their durability.


  • 1824

    Portland Cement

    Joseph Aspdin (1778-1855) files patent for the world’s first Portland cement, named after its resemblance to Portland stone.


  • 1853

    Iron Reinforced Concrete

    French engineer François Coignet (1814-1888) builds the first structure using iron-reinforced concrete, a four-story house near Paris, which still stands today.


  • 1905

    Early Prefabrication

    City engineer of Liverpool, John Alexander Brodie (1858-1934) experiments with the use of prefabricated concrete wall panels as a solution for housing.


  • 1919

    Early Precast Flooring

    Concrete Ltd. (later to be renamed Bison Concrete) is founded, and begins making reinforced precast floors at its factory in Stourton, Leeds.


  • 1928


    French structural and civil engineer, Eugène Freyssinet (1879-1962), files a patent for his prestressing techniques. He develops systems for anchorage and the use of high-strength steel wire.


  • 1935

    Hollowcore Slabs

    Concrete Ltd. are producing hollowcore slabs in wet cast concrete moulds. This is revolutionised by the introduction of withdrawable pneumatic cores, used to form the voids.


  • 1952

    Machine Casting

    Mechanisation and standardisation have revolutionised industry. A Hungarian, Henry Nagy, buys a hollowcore machine from a German inventor, and Spancrete begin long-line casting in the US.


  • 1962

    Spiroll Extrusion Process Invented

    Spiroll hollowcore extruder invented by Glen C. Booth, of Building Products and Coal Ltd., in Winnipeg, Canada.


  • 1964

    Spiroll International Office Opened

    Spiroll open an office in London to facilitate the sale of machinery around the world.


  • 1969

    International Spiroll Producers Association (ISPA) Founded

    Seven Spiroll producers from seven different countries found ISPA, in order to promote the exchange of knowledge.



    Spiroll Operates Entirely out of UK

    Spiroll International purchases manufacturing rights and trademark. Other extruder manufacturers such as Weiler (Germany) and Partek (Finland) continue development of the market.


  • 1986

    International Extruded Concrete Association (IECA)

    The remit of the organisation is expanded to include manufacturers using other extruders. Meanwhile, other machines are developed using the slipform method, such as Prensoland (Spain), Nordimpianti (Italy) and Echo (Belgium).


  • 1993

    International Prestressed Hollowcore Association (IPHA) is formed.

    At the 7th annual IECA conference in Malta, Terry Treanor and Tony Crane (Bison) deliver a presentation, and the decision is made to expand the organisation to include slipform manufacturers.


  • 1994

    The First IPHA Annual Conference is Held.

    Hosted by Bison Concrete in Stratford-upon-Avon, it coincides with Bison’s 75th anniversary.


  • 2000

    7th IPHA Annual Conference

    IPHA’s annual conference is held in Florida, in cooperation with the Prestressed/Precast Concrete Institute of the USA.


  • 2005

    Inaugural Terry Treanor Award

    Following the death of IPHA Chairman Terry Treanor in 2003, an award for innovations within hollowcore is inaugurated in his honour.


  • 2006

    IPHA Logo Redesign and Promotional Video


  • 2010

    Rebranding and Website Development



  • 2019

    50th Anniversary

    Marking 50 years from the formation of ISPA, IPHA commissions a written history of the organisation, and a new website is launched.

Download The History of IPHA 1969 – 2019

To celebrate its 50th anniversary, IPHA commissioned a written history of the organisation.

To download a PDF version, please click on the button below.

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