【摘要】 对60,50,43℃及干冰、水冰温度条件下钻芯取得的沥青混合料进行了表观密度、空隙率、间接抗拉刚度模量和水稳定性试验研究.结果表明:取样温度条件对试体的表观密度和间接抗拉刚度模量具有显著的影响,随着取样温度的下降,试体表观密度和间接抗拉刚度模量显著增加,空隙率显著下降;高温取样试体易受剪切力的影响,间接抗拉强度较低;低温取样试体由于其混合料黏结紧密,不易受剪切力的影响,间接抗拉强度相对较高;水冰取样时,由于水冰受热融化通过沥青混合料空隙渗入结构内部,对试体的水稳定性产生影响.更多还原

【Abstract】 In laboratory,the bituminous mixture coring at different coring condition were obtained to test its bulk density,air void content,indirect tensile stiffness modulus and water stability.The results show that the coring condition has significant influence on the bulk density and indirect tensile stiffness modulus.When the temperature goes down,the bulk density and indirect tensile stiffness modulus increase obviously.On the other hand,if the coring temperature decreases,the air void also decreases.At the high temperature,the coring can be damaged due to the shear stress from coring,the indirect tensile stress(ITS) is low.At the lower temperature,the asphalt is cooled,and the bituminous mixture bonds firmly,the coring can not be damaged easily,and the indirect tensile stiffness is high.Coring at ice,when ice contacts with mixture,ice melts and the water will infiltrate into the air void of the mixture,the water stability of mixture will be affected.更多还原