Russia develops faster testing of freeze-thaw resistance for cement
Researchers from the Peter the Great Saint Petersburg Polytechnic University have created a new technique for testing freeze-thaw resistance for construction materials. At present, all methods for determining the freeze-thaw resistance are very labour-and time-consuming. The SPbPU researchers have pointed out that although many new types of concrete are being put out on the market. Current tests require multiple heating and cooling cycles of the materials under examination. This makes the freeze-thaw resistance assessment a number of cycles which the material can withstand without suffering a notable loss in its durability. Researchers have suggested replacing the bulk of the heating-cooling cycles with mechanical treatment cycles which should not lead to any deterioration in accuracy. This innovative approach has been tested on ordinary Portland cement by compressing the sample. Scientists then measured the extent of the damage caused by the mechanical treatment. They found out that the suggested testing method makes it possible to reduce the number of samples from 50 to 10, and for cutting the number of required thermal cycles from 100 to 5.