Black and white interlaminar instability failure of asphalt overlay on old cement slab
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摘要: 为分析旧水泥板沥青加铺层黑白层间水平剪切滑移和界面粘结两类失稳性破坏, 通过复合结构弹性理论计算、MATLAB编程、层间剪切和拉拔试验, 揭示了车速、路面附着系数、竖向荷载、层间接触系数、加载速率、温度、粘层油洒布量等对层间极值应力应变、剪切强度和拉拔强度的影响规律, 分别建立了层间剪切强度与正应力、剪切速率、温度以及拉拔强度与拉拔速率、温度、粘层油洒布量的函数关系。分析结果表明: 15℃时拉拔破坏界面发生概率从大到小排序为水泥板表面、粘结层、沥青膜, 45℃时为粘结层、水泥板表面、沥青膜, 层间平均粘结强度随着上述排序的递减而增大; 为减少层间失稳性破坏, 应适当提高行车速度, 控制汽车轴载, 清洁和糙化水泥板表面, 选取适宜的粘层油洒布量, 液体石油沥青为0.20~0.40 L.m-2, 乳化沥青为0.48~0.60L.m-2, 并推荐以芯样平均拉拔强度和破坏界面位置作为加铺层施工质量检验判别依据。Abstract: In order to study the two kinds of instability failures between asphalt overlay and old cement slab such as black and white interlaminar horizontal shear slippage and interfacial bonding instability, the influence rules of vehicle speed, road adhesion coefficient, vertical load, interlaminar contact coefficient, loading rate, temperature and the spraying amount of viscous oil on interlaminar extreme stress and strain, shear strength and pull-out strength were revealed through the elastic theoretical calculation of composite structure, MATLAB programming, interlaminar shear test and pull-out test.The function relationships among interlaminar shear strength and normal stress, shear rate, temperature, and among pull-out strength and pull-out rate, temperature, the spraying amount of viscous oil were established respectively.Analysis result shows that the descending order of pull-out failure interface occurrence probabilities at 15 ℃ is cement slab surface, tack coat, asphalt membrane, the descending order at 45 ℃ is tack coat, cement slab surface, asphalt membrane, and average interlaminar bonding strength increases with the descending of above order.In order to reduce interlaminar instability failure, vehicle speed should be increased appropriately, vehicle axle load should be controlled, the clean and rough surface conditions of old cement slab should be kept, the spraying amount of viscous oil should be chosen appropriately, liquid petroleum asphalt is 0.20-0.40 L·m-2, and emulsified asphalt is 0.48-0.60 L·m-2.The average pull-out strength of core sample and interface failure position are recommended as distinguishinging bases for the construction quality of asphalt overlay.
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Table 1. Calculation result of f
Pavementcondition Pavement type Vehicle speed/(km·h-1) 10 30 60 Dry Cement concrete 0.70-0.85 0.65-0.80 0.60-0.75 Asphalt overlay 0.70-1.00 0.65-0.85 0.5-0.65 Macadam pavement — 0.55-0.60 — Moist Cement concrete 0.60-0.70 0.40-0.60 0.35-0.55 Asphalt overlay 0.40-0.65 0.25-0.60 0.10-0.50 Macadam pavement — 0.35-0.40 — 
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Table 2. Result of direct pull-out test
Pull-out damage interface Cement slab surface damage Tack coat damage Asphalt membrane damage Epoxy damage Experimental temperature/℃ 15 45 15 45 15 45 15 45 Damage number 19 9 6 13 4 6 1 2 Damage probability/% 63.33 30.00 20.00 43.33 13.33 20.00 3.33 6.67 Average bonding strength/MPa 0.518 0.496 0.645 0.314 0.707 0.511 Standard deviation of bonding strength/MPa 0.082 0.059 0.116 0.048 0.149 0.091
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Table 3. Average interlaminar pull-out strengths under different spraying amounts MPa
Asphalt type Specification 15 ℃±1.5 ℃, spraying amount/(L·m-2) 45 ℃±1.5 ℃, spraying amount/(L·m-2) 0.2 0.4 0.6 0.2 0.4 0.6 Medium-curing liquid petroleum asphalt (Shangdong Sunshine) AL(M)-3 0.303 0.287 0.283 0.172 0.164 0.141 AL(M)-5 0.356 0.398 0.371 0.173 0.188 0.137 AL(M)-6 0.387 0.378 0.369 0.169 0.194 0.146 Quick breaking emulsified asphalt(Shell) PC-3 0.408 0.492 0.436 0.197 0.261 0.246 PA-3 0.329 0.407 0.406 0.193 0.227 0.227
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