Na2O, K2O, SiO2 and Al2O3 release from potassic and calcium-sodium feldspars into the concrete pore solution

FRANSISCO LOCATI; SILVINA MARFIL; EDGARDO BALDO; PEDRO MAIZA

CEMENT AND CONCRETE RESEARCH

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2010 vol. 40 p. 1189 - 1196

0008-8846

The potential release of elements from potassic and calcic–sodic feldspars into the concrete pore solution was evaluated by ICP-MS using 1 N NaOH and KOH solutions at 80 °C in accordance with the conditions set in the chemical test method. Materials were characterized by petrography, XRD and by XRF analysis. The influence of textural and microstructural characteristics on the leaching process was also analyzed by immersing polished plates of each mineral in 1 N NaOH at 80 °C for 7 days. Optical microscope and SEM observations indicate that microstructural characteristics, such as cleavage zones, twins, grain–grain contact and the finer and less abundant phases in perthites, play a key role in the leaching process under alkaline conditions. Na2O, K2O, SiO2 and Al2O3 are supplied by hydrolysis, although the participation of other processes cannot be ruled out.