Technical-economical consequences of the use of controlled permeable formwork

Author(s): R. Torrent, A. Griesser, F. Moro, F. Jacobs
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 476- 477
Total Pages: 2
Language: English

Abstract: 
A series of tests, applied on a 16-year old panel with one face de watered by the use of “Zemdrain” CPF, showed an improvement in hardness and a reduction in the “penetrability” of the treated surface, compared to that in direct contact with the formwork. The series included NDT (Rebound and Air-Permeability) and tests on drilled cores: Chloride Migration, Water sorptivity and microscopy observation (both last conducted at different depths). The application of the CPF resulted in an improvement of all the properties tested and can be associated to a w/c reduction from 0.55 to about 0.40. The tests conducted at different depths showed that the CPF’s effect of reducing the w/c ratio extends to a depth of 10–30 mm. The cost-efficiency of the use of CPF depends on the local conditions and the surface/volume ratio of the element; for Switzerland, the treatment may become convenient only for relatively thick walls. However, the spread of the use of CPF goes hand-in-hand with the adoption of performancebased specifications, particularly those specifying and controlling the “penetrability” of the concrete on site (end product).

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00