Recycling Thickness Test Method in Hot-in-Place Recycling Project of Asphalt Pavement

Abstract

The invention discloses a recycling thickness test method for an asphalt pavement in a hot in-place recycling project. The method comprises the following steps: step 1, ordinary Portland cement is uniformly spread on a milled and planed pavement in a hot in-place recycling construction process of the asphalt pavement; step 2, after paving and rolling in a cement spreading position and the pavement temperature is reduced to 50 DEG C, a pavement core drilling rig is used for core drilling at a cement spreading center point; step 3, the diameter d of a core sample is measured; step 4, the core sample is placed in a hydrostatic balance, the weight m1 of the core sample in water is weighed, and the saturated surface dry mass m2 of the core sample is measured after the core sample is taken out; and step 5, the thickness of a recycling layer is calculated. The recycling thickness of the asphalt pavement in the hot in-place recycling project can be described effectively and accurately with the test method.

Description

technical field [0001] The invention relates to the technical field of quality control of asphalt pavement hot-in-place regeneration engineering. Background technique [0002] By the end of 2012, the total mileage of highways in my country had reached 4.2375 million kilometers, of which, the mileage of expressways had grown to 96,200 kilometers, surpassing the United States and ranking first in the world. After experiencing the construction climax, a lot of maintenance needs also come. Among them, hot-in-place regeneration of asphalt pavement is a relatively advanced asphalt pavement maintenance technology that has been gradually promoted and applied in China in recent years. Improve the aging condition of asphalt on the surface of the original pavement, and also adjust or improve the gradation of the original pavement by adding new asphalt mixture to enhance its road performance. [0003] The quality of hot-in-place regeneration of asphalt pavement is affected by various ...

AI Technical Summary

Problems solved by technology

[0006] (1) Since the regenerated layer is similar to the material of the lower layer and is thermally bonded, the fusion of asphalt concrete is better. It has been shown in engineering practice that the interface of in-situ thermal regeneration is not clear

[0007] (2) Since the construction is affected by various factors and the variability is large, the road surface is not smooth after the actual milling, and the method of measuring the surface height with a steel ruler or caliper after coring is not accurate