Rubber crumb used in concrete to provide freeze-thaw protection

Richardson, Alan, Coventry, Kathryn and Diaz, Eli (2015) Rubber crumb used in concrete to provide freeze-thaw protection. In: Euro-Elecs-2015: Latin American and European Conference on Sustainable Buildings and Communities, 21-23 July 2015, Guimaraes.

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Abstract

This research has examined the use of rubber crumb, used as an additive to concrete that would provide maximum freeze-thaw protection to concrete. The rubber crumb as used in the paper was divided into five batches, with increasing particle size, graded in increments of 0.5mm, from <0.5 to 2.5mm. The primary properties of the concrete investigated were; freeze-thaw durability and compressive strength. These were tested using standard test methods.
The range of tests used were conclusive in that the <0.5 the rubber crumb particle size, provided the greater degree of air entrainment. The freeze-thaw cycle results suggested that rubber crumb provided freeze/thaw protection, as the plain concrete deteriorated compared to the concrete with rubber crumb additions. There was no definitive correlation between the compressive strength and the rubber crumb particles size, although the rubberised concrete had an average strength loss of 5.24% after 28 days. This research indicates that rubber crumb graded up to <0.5mm is the optimum size to use, when rubber crumb granules are used to provide freeze/thaw protection in concrete.

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