Does somebody has info to share about the use of the Taywood/Valenta method to calculate the coefficient of permeability based on penetration depth on modified measurements according to DIN 1048-5 or BS EN 12390-8.
I have not used the method. Nevertheless, the original publication by Valenta can be found at:
Valenta, O. “Kinetics of Water Penetration into Concrete as an Important Factor of its Deterioration and Reinforcement Corrosion,” Proceedings Intl. Symp. Durability of Concrete, RILEM, Prague, 1969, pp. A177-A193.