Formulation design and performance evaluation of MMA-based anti-skid coating for airport pavements based on texture reconstruction
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摘要: 以纹理重塑为目标,主要采用甲基丙烯酸甲酯(MMA)、2种固化剂以及石英砂、碳化硅、棕刚玉3种优质骨料,设计了4种用于水泥混凝土道面的MMA基修复涂层。该涂层由界面层和功能层双层组成,界面层的质量比MMA∶粉状过氧化苯甲酰(BPO)为25∶1,性能层MMA∶粉状BPO∶液体固化剂∶骨料为100∶1∶3.3∶30;从纹理重塑状态、界面粘结强度、抗冻耐久性对MMA基修复涂层进行了性能评价。研究结果表明:在纹理重塑状态方面,与无涂层试样(混凝土拉毛纹理)相比,MMA涂层的纹理高度、均值断面深度以及斜率谱密度(特征波长为0.1 mm)分别提升3、7.5、23倍;添加MMA涂层后,混凝土基准板BPN值增大约1倍,且其与均值断面深度(MPD)相关性良好(R2=0.85),这证明了不同测试尺度抗滑性能表征结果的一致性;在界面粘接强度方面,4种MMA基涂层的3、24 h拉拔强度分别集中在3.47~4.46、3.70~4.76 MPa,说明MMA涂层不但固化速度快且与混凝土界面粘接性能优异,这源于MMA与混凝土界面交互的物理嵌锁行为、化学键合作用和环境适应机制;在抗冻耐久性方面,经150次冻融循环,无涂层试样出现了大面积露骨现象,而MMA基涂层试样经300次冻融循环后,涂层脱落面积仍小于1%,且混凝土试样表观状态完好,说明了涂层抗冻防护性良好。可见,本研究设计的MMA基涂层具有丰富的纹理构造、优异的界面粘接性能以及良好的冻融防护能力,为水泥混凝土道面的抗滑修复、韧性提升技术研究提供新材料储备与思路借鉴。Abstract: To achieve texture reconstruction, four types of MMA-based repair coatings for cement concrete pavements were designed by mainly using methyl methacrylate (MMA), two curing agents, and three high-quality aggregates including quartz sand, silicon carbide, and brown fused alumina. The coating consists of a double-layer structure: an interface layer and a functional layer. The mass ratio of the interface layer of MMA∶powdered benzoyl peroxide (BPO) is 25∶1, while that of the functional layer of MMA∶powdered BPO∶liquid curing agent∶aggregate is 100∶1∶3.3∶30. The performance of the MMA-based repair coatings was evaluated in terms of texture reconstruction state, interfacial bonding strength, and freeze-thaw durability. Research results indicate that in terms of texture reconstruction state, compared with the uncoated specimens (concrete roughened texture), the texture height, mean profile depth, and slope spectral density (characteristic wavelength=0.1 mm) of the MMA-coated specimens increase by 3, 7.5, and 23 times, respectively. After applying the MMA coating, the BPN of the concrete reference slab approximately doubles, and it has a good correlation with the mean profile depth (MPD) (R2=0.85), which verifies the consistency of skid resistance characterization results at different test scales. In terms of interfacial bonding strength, the pull-off strengths of the four MMA-based coatings at 3 and 24 h are concentrated in 3.47-4.46 and 3.70-4.76 MPa, respectively. This indicates that the MMA coatings not only have a fast curing speed but also exhibit excellent interfacial bonding performance with concrete, which is attributed to the physical interlocking behavior, chemical bonding interaction, and environmental adaptation mechanism of the interface interaction between MMA and concrete. In terms of freeze-thaw durability, after 150 freeze-thaw cycles, the uncoated specimens show extensive aggregate exposure; in contrast, after 300 freeze-thaw cycles, the coating peeling area of the MMA-based coating specimens is still less than 1%, and the concrete specimens maintain a sound apparent state, which demonstrates the good freeze-thaw protection performance of the coatings. Therefore, the designed MMA-based coatings possess abundant texture structures, excellent interfacial bonding performance, and good freeze-thaw protection capacity, providing new material reserves and reference ideas for the research on skid resistance repair and toughness improvement technologies of cement concrete pavements.
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表 1 MMA乳液主要技术指标
Table 1. Main technical indicators of MMA emulsion
颜色 黏度/(Pa·s) 密度/(g·cm-3) 固化后拉伸强度/MPa 工作温度/℃ 白色 40~60 0.96~1.01 20.7~24.1 -54~121 表 2 骨料主要技术指标
Table 2. Main technical indicators of aggregates
指标 (粗/细)石英砂 碳化硅 棕刚玉 化学成分 SiO2 SiC Al2O3 莫氏硬度 7 9.5 9 耐磨性 中 极高 高 成本 低 高 中 适用场景 常规防滑、经济需求 极端耐磨、高温环境 重载、抗冲击区域 表 3 骨料粒度参数
Table 3. Aggregate gradation parameters
骨料 Dv(10)/mm Dv(50)/mm Dv(90)/mm 细度模数 粗石英砂 0.82 1.57 2.20 3.74 碳化硅 0.33 0.45 0.57 2.00 棕刚玉 0.33 0.46 0.60 2.08 细石英砂 0.11 0.34 0.57 1.41 表 4 试件质量损失百分比
Table 4. Percentage of specimen mass loss
% 涂层情况 不同循环次数的质量损失百分比 50 150 300 无涂层 0.1 4.2 粗石英砂 0.0 0.0 0.2 碳化硅 0.0 0.0 0.0 棕刚玉 0.0 0.0 0.1 细石英砂 0.0 0.0 0.2 -
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