A microbalance study of the effects of hydraulicity and sand grain size on carbonation of lime and cement

Reference:

El-Turki, A., Carter, M. A., Wilson, M. A., Ball, R. J. and Allen, G. C., 2009. A microbalance study of the effects of hydraulicity and sand grain size on carbonation of lime and cement. Construction and Building Materials, 23 (3), pp. 1423-1428.

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Official URL:

http://dx.doi.org/10.1016/j.conbuildmat.2008.07.006

Abstract

A microbalance technique for the real-time measurement of carbonation in cement and lime pastes and mortars is described. Experimental results showing carbonation rates in a range of these materials are presented. The results confirm that the progression of carbonation is proportional to t1/2. Systematic differences in carbonation rate with hydraulicity are shown for a range of lime pastes of the same mix proportion. For lime mortars, the carbonation rate is shown to decrease as the sand particle size is increased for mixes of a given volume fraction sand content. Scanning electron microscopy shows the typical crystal morphologies produced on carbonation. It is shown that the microbalance provides a highly sensitive technique for the investigation of carbonation in cementitious materials.

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