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采用重复蠕变试验,利用Burgers模型对各沥青胶浆的蠕变过程进行模拟,从胶浆的蠕变劲度黏性成分Gv、累积应变γacc和蠕变柔量等方面分析了不同阻燃沥青胶浆的高温性能表现。结果表明:纤维和复合阻燃剂的加入均会增大阻燃沥青胶浆的Gv并降低γacc,3种复配比例的阻燃沥青胶浆中M-FR1和M-FR2的Gv值相等且最大;而MFR1沥青胶浆的γacc最小;其次是M-FR2。这两种阻燃沥青胶浆高温性能均要优于常规掺量下的木质素纤维沥青胶浆。蠕变柔量分析结果表明,M-FR2阻燃沥青胶浆的瞬时弹性变形柔量JE和延迟弹性变形柔量JC占总柔量的百分比之和最大,高温抗变形能力最强。综合各阻燃沥青胶浆的蠕变力学特性,推荐复合阻燃材料的最优复配比例为15%矿物纤维+6%复合阻燃剂(即M-FR2)。
Using creep test, the creep process of asphalt mortar was simulated by Burgers model. The effects of different flame retardant asphalt were analyzed from aspects of creep stiffness viscosity Gv, cumulative strain γacc and creep compliance. Mastic high-temperature performance. The results show that the addition of both fiber and composite flame retardant increases the Gv of flame retardant asphalt mortar and decreases γacc. The Gv values of M-FR1 and M-FR2 in the three types of flame retardant asphalt mortar are the same Maximum; MFR1 asphalt mortar yacc smallest; followed by M-FR2. Both flame retardant asphalt mortar high temperature performance should be better than conventional dosage of lignin fiber asphalt mortar. The results of creep compliance analysis show that the instantaneous elastic deformation JE and the delayed elastic deformation JC of the M-FR2 flame retardant asphalt mortar are the largest and the highest percentage of the total compliance, and have the strongest anti-deformation ability at high temperature. Based on the creep mechanics characteristics of all flame retardant asphalt mortars, the optimal compounding ratio of composite flame retardant materials is recommended as 15% mineral fiber + 6% composite flame retardant (ie M-FR2).