摘要
为研究潮湿环境下沥青路面反射裂缝和唧浆的注浆修复效果,优化双组分聚氨酯的耐水性能,利用模拟裂缝试件的力学试验表征不同界面条件下注浆效果的差异,并结合实体工程验证耐水型聚氨酯注浆材料的有效性。研究结果表明:干燥裂缝界面更容易提升注浆材料的注浆效果,湿润裂缝界面的强度恢复率很低;利用ALT潜固化剂,可以改善湿润界面条件下注浆试件的强度恢复率,在ALT添加3%时,能达到良好的强度恢复率,可有效改善潮湿环境下注浆材料对裂缝的界面黏结效果。反射裂缝处治后的路面弯沉全部接近于无病害路段,弯沉较病害路段降幅28%;唧浆处治后的路面回弹模量增幅为23%。因此,该注浆处治技术有效降低了路面弯沉,提高了路面回弹模量,恢复了路面的结构稳定性。沥青路面反射裂缝和唧浆的修复工作应尽量避开雨季,让裂缝处于干燥环境,保障注浆效果。路面结构内部潮湿时,应积极采用耐水型聚氨酯注浆材料。
To investigate the effect of grouting to repair reflective cracking and chipping in asphalt pavements under humid conditions,optimizing the water resistance performance of a two-component polyurethane.The differences in grouting effectiveness under different interface conditions were characterized by mechanical tests using simulated crack specimens,and the effectiveness of water-resistant polyurethane grouting materials was also verified in conjunction with physical works.The results show that the strength recovery rate was very low under the wet interface,as the dry interface of the crack was more likely to enhance the grouting effect of the grout.However,adding ALT latent curing agent could improve strength recovery rates for grouting specimens under wet interface conditions.Good strength recovery rates were achieved with an ALT addition of 3%,which effectively improved interfacial bonding between grouting materials and cracks under wet environments.Bending settlements of pavements treated with reflective cracking are all close to those of normal pavements.Specifically,28%reduction in flexural settlement in comparison to the diseased section;23%increase in modulus of elasticity of the pavement after slurry treatment.Therefore,this grouting treatment technology effectively reduced the pavement's bending settlement,improved the pavement's resilience modulus and restored the pavement's structural stability.When repairing reflective cracks and grouting asphalt pavements,the rainy season should be avoided as much as possible,so that the cracks are in dry conditions to ensure the grout is effective,and waterproof polyurethane grout should be actively used when the inside of the pavement structure is wet.
作者
樊亮
石南
梁皓
魏慧
宋小金
FAN Liang;SHI Nan;LIANG Hao;WEI Hui;SONG Xiaojin(Shandong Transportation Institute,Jinan 250012,China;Shandong Expressway Peninsula Investment Co.,Ltd.,Yantai 264100,China;Hunan Huacheng Testing Co.,Ltd.,Changsha 414200,China)
出处
《交通科学与工程》
2023年第4期24-31,共8页
Journal of Transport Science and Engineering
基金
山东省交通科技计划项目(2017B22)
湖南省交通科技项目(201801)。
关键词
双组分聚氨酯
裂缝修复
唧浆处治
弯沉
回弹模量
two component polyurethane
crack repair
pumping treatment
deflection
resilient modulus
