SEDL / STP / STP1061-EB / STP23459S

Contribution of Alkalies by Aggregates to Alkali Aggregate Reaction in Concrete

Batic, OR
senior research fellowadjunct professionalprincipal technician, LEMIT-CIC, Comision de Investigaciones Cientificas Bs. As.CIDEPINT--CIC, La Plata,

Sota, JD
senior research fellowadjunct professionalprincipal technician, LEMIT-CIC, Comision de Investigaciones Cientificas Bs. As.CIDEPINT--CIC, La Plata,

Iasi, R
senior research fellowadjunct professionalprincipal technician, LEMIT-CIC, Comision de Investigaciones Cientificas Bs. As.CIDEPINT--CIC, La Plata,

Pages: 10    Published: Jan 1990

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Abstract

The cause of uncontrolled reactions can have different origins or explanations. This paper has the main objective of demonstrating that aggregates employed under certain circumstances also introduce alkalies in significant amounts. They can even exceed the amount of alkalies coming from other sources, mainly those brought by cement.

Applying a technique as simple as ASTM C 311 to fine and coarse aggregates from different sources, treated in the presence of calcium hydroxide solution or deionized water, available alkalies were determined which can pass to the solution present in concrete pores. The influence of aggregate particle size was also studied. All determinations were realized at 28 days.