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Tensile Properties and Its Evaluated Indexes of Waterproofing Material for Bridge Decks

PEI Jian-zhong1,WANG Fu-yu2 (1.Key Laboratory for Special Area Highway Engineering of Ministry of Education,Chang'an University,Xi'an 710064,Shaanxi,China;2.School of Transportation,Jilin University,Changchun 130022,Jilin,China)  
Tests on the influencing rules of pulling speeds,specimen widths and lengths to tensile strength and fracture elongation were studied.Moreover,the force characteristics for bridge decks with negative moment and the cracks in base course were analyzed.Then,the evaluation indexes of tensile properties of waterproofing material for bridge decks were proposed.The results show that the waterproofing material specimens are subject to the changes of pulling speeds and the uncertainty attends test results in the relative high speed;the fracture elongations correlated weakly with specimen widths,but tensile strengths are directly proportional to speciemen widths;the fracture elongation reduces with the stretching length increasing gradually,however,the material intensity has not appeared any obvious regularity.Specimen aging has a significant impact on its tensile strength and fracture elongation,which show the material strength and fracture elongation decrease 10.9% and 25.0% respectively after aging.Taking into account of cracks in base course and negative moment for the bridge decks,the standard of tensile strength of waterproofing material for bridge decks can be calculated.By analyzing comprehensively,the pulling test speed of 100 mm·min-1,specimen width of 50 mm,length of 180 mm,material tensile strength index of 36 N·cm-1 for waterproofing material in bridge decks are gained.
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