Materiales de Construcción, Vol 67, No 325 (2017)

A review of sample preparation and its influence on pH determination in concrete samples


https://doi.org/10.3989/mc.2017.08515

S. Manso
Polytechnic University of Catalonia, Spain
orcid http://orcid.org/0000-0002-2712-5976

A. Aguado
Polytechnic University of Catalonia, Spain
orcid http://orcid.org/0000-0001-5542-6365

Abstract


If we are to monitor the chemical processes in cementitious materials, then pH assays in the pore solutions of cement pastes, mortars, and concretes are of key importance. However, there is no standard method that regulates the sample-preparation method for pH determination. The state-of-the-art of different methods for pH determination in cementitious materials is presented in this paper and the influence of sample preparation in each case. Moreover, an experimental campaign compares three different techniques for pH determination. Its results contribute to establishing a basic criterion to help researchers select the most suitable method, depending on the purpose of the research. A simple tool is described for selecting the easiest and the most economic pH determination method, depending on the objective; especially for researchers and those with limited experience in this field.

Keywords


pH; Concrete; Mortar; Cement paste; Pore solution

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References


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