Durability Evaluation of Minimally Invasive Grouting for Semi-rigid Base Cracks:Taking Nanjing-Hangzhou and other High-speed Railway in Jiangsu Province as an Example
In the maintenance engineering of asphalt pavement on highways,conventional methods are difficult to completely solve the problem of hidden diseases inside the pavement structure.Minimally invasive grouting technology is gradually being used for the repair of such diseases due to its technological advantages.However,current research focuses on the grouting materials and construction techniques,with less attention paid to the durability evaluation of grouting technology.Given that durability directly affects the effectiveness and lifespan of the technology,conducting durability evaluation is particularly important.Two methods including indoor testing and on-site road surface tracking observation were used to evaluate the effectiveness of crack grouting in semi-rigid base layers.The research results showed that the recovery rates of unconfined compressive strength at different ages of 28 days,90 days,and 1 year of curing were 70.4％,70.0％,and 68.6％,respectively.The shear strength of the ground push direct shear test for 7 days,28 days,90 days,and 1 year of health preservation were 0.75,1.25,1.21 and 0.90 MPa,respectively.The splitting strength value of two freeze-thaw cycles after 28 days of health preservation is 5.2 MPa.The results indicate that the unconfined compressive strength and shear strength values of the semi-rigid base crack still maintain good levels after minimally invasive grouting and long-term use.According to continuous tracking and observation of physical engineering,the integrity of the core sample is high,the slurry is full,and the strength value has not significantly decreased.
asphalt pavementsemi rigid base layerminimally invasive groutingdurabilitypost work observation
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