Abstract
This paper aims to design a self-sensing cement mortar of optimised mechanical and sensing properties considering the water-cement ratio and propose a freeze–thaw damage sensing evaluation parameter. An orthogonal experimental design of compressive strength test and piezoresistive response test was utilised to find the optimal proportion. Freeze–thaw damage sensing test was conducted to found the method for characterising freeze–thaw damage. It is found that the order of the influential factors on stress sensitivity is CF (carbon fibre) content > water-ratio > SF (steel fibre) content. A freeze–thaw damage parameter D k was proposed for characterising freeze–thaw damage based on the slope of the curve of fraction change in resistivity and freeze–thaw cycle numbers and it can be applied to the prediction of the service life of self-sensing cement mortar. The findings of this investigation can help engineers realise freeze–thaw damage evaluation in cement concrete pavement using self-sensing cement mortar.
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