Measurement of alkalinity in concrete by a simple procedure, to investigate transport of alkaline material from the concrete slab to a self-levelling screed
2002 (English)In: Construction and Building Materials, ISSN 0950-0618, Vol. 16, no 8, 535-542 p.Article in journal (Refereed) Published
A test procedure for measurement of alkalinity for cementitious materials that is, reliable, simple. and only needs a small amount of sample, was developed and applied to check whether transport of alkaline material from a concrete surface to a covering screed can result in a detectable increase in pH-value. It was found that any transport of alkaline material from a rather humid concrete did not increase the level of alkalinity (or pH-value) of the screed covered with a carpet. It was noted that carbonation Occurred gradually from the surface and inwards when the materials were exposed to ambient air. For the prisms, of 95%, RH pH-value in the concrete surface increased with time. A transport process that allows hydroxide ions solved in the pore water in the concrete to diffuse towards the carbonated surface and thus give an increased pH-value, can explain this.
Place, publisher, year, edition, pages
2002. Vol. 16, no 8, 535-542 p.
alkalinity, concrete, self-levelling screed, flooring, high-alumina concrete
IdentifiersURN: urn:nbn:se:kth:diva-22035ISI: 000179128900010OAI: oai:DiVA.org:kth-22035DiVA: diva2:340733
QC 201005252010-08-102010-08-10Bibliographically approved