Test method of emulsified asphalt demulsification time based on compressive strength

Abstract

The invention relates to an emulsified asphalt demulsification time testing method based on compression strength. The method comprises the following steps: (1) putting a blended emulsified asphalt mixture into an unconfined compression strength mold; (2) putting an iron block having a constant weight on the emulsified asphalt mixture, respectively curing for 2, 3, 4, 5, 6 and 7 hours, and simulating the state of the emulsified asphalt mixture in a transportation process; (3) demolding the emulsified asphalt mixture cured for the specified time length, and testing the compression strength of the emulsified asphalt mixture by using a universal testing machine (UTM) at a constant loading rate; and (4) comparing the compression strength values of the emulsified asphalt mixture cured for different time lengths, wherein the curing time corresponding to the emulsified asphalt mixture with the largest compression strength is the emulsified asphalt demulsification time.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a technology for testing emulsified asphalt demulsification time. Background technique [0002] As a representative of cold recycled asphalt mixture, emulsified asphalt has been widely used in road surface maintenance projects in recent years because of its convenient construction, safety and environmental protection. It takes a certain amount of time for emulsified asphalt to demulsify, and its demulsification speed is also different due to different transportation distances. According to the current JTG E20-2011 "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering", the The demulsification speed is divided into fast cracking, medium cracking and slow cracking. In actual engineering, many construction units often fail to determine the demulsification time of emulsified asphalt, resulting in material waste and affecting construction qual...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of emulsified asphalt demulsification time given by our country's standards is difficult to quantitatively measure the emulsified asphalt demulsification time, and there will be uncertainty in the demulsification time due to personal factors, environmental factors, demulsification artifacts, etc.

The disclosed test method and device of CN203551496U characterize the demulsification speed of emulsified asphalt by measuring its current value, though the demulsification speed of emulsified asphalt can be quantitatively measured, the demulsification speed of its determination is only the demulsification speed of emulsified asphalt liquid, and It is not the demulsification speed of the on-site emulsified asphalt mixture, and there is a lack of simulation of the actual construction situation on the site

Although CN 105699634A has made some improvements on its basis, the test method and device are relatively complicated, and it is impossible to simulate the condition of the emulsified asphalt mixture during transportation, and it has little significance for on-site construction guidance with limited conditions

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