Experimental Study on Rubber Powder Modified Cement Grouting Material under Salt-Freeze Thawing Weakening Factor
A typical rubber-cement void repair material is selected.The control ages are 4d and 3d respectively,and the dosage of rubber powder is 0％and 5％,10％,15％and 20％,respectively.Based on the statistical analysis of experimental data,the weakening trend of dynamic elastic modulus,compressive strength,flexural strength and volume expansion rate of repair materials of different ages and different dosages in salt-freeze thawing environment is summarized and analyzed.The test results show that after adding the rubber powder,the mechanical indicators of the grouting material have been significantly improved,and the improvement effect from superior to inferior is dynamic elastic modulus,compressive strength and flexural strength.For urban arterial roads,it should be preferred to increase the dosage of rubber powder to ensure that the pavement structure has a higher bearing capacity after the grouting is completed.For urban sub-trunk roads and roads below with small traffic volume,the priority should be given to increasing the curing time.In engineering practice,the dosage of rubber powder should be controlled at 12％to obtain the maximum engineering effect.The volume expansion rate of the grouting material is controlled within 3％,which shows that the rubber cement grouting material not only has a good volume expansion rate,but also has the good stability under the action of freeze-thawing cycles.
road engineeringvoid under slabrubber repair materialssalt-freeze thawing damage
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