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Simple aging testing method equivalent to RTFO or PAV aging effects

A kind of aging test, a simple technology, applied in the direction of material inspection products, etc., can solve the problem that the modified asphalt is difficult to form a film, easy to spill out of the bottle, etc., to achieve the effect of expanding detection and research ideas, simple test, and low price

Pending Publication Date: 2018-12-11
LONGJIAN ROAD & BRIDGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the large-scale application of modified asphalt, RTFO tests have gradually revealed some problems, mainly because some modified asphalt is difficult to form a film in the RTFO container, and it is easy to spill out of the bottle during the test, although these problems can be solved It can be improved to a certain extent by increasing the test temperature or adding a steel rod; in addition, many scholars have found that there is a big gap between the aging simulation of RTFO+PAV and the aging process experienced by asphalt on the actual road.

Method used

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  • Simple aging testing method equivalent to RTFO or PAV aging effects
  • Simple aging testing method equivalent to RTFO or PAV aging effects
  • Simple aging testing method equivalent to RTFO or PAV aging effects

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A simple aging test method equivalent to the short-term aging effect of RTFO, which consists of: a rectangular test plate and an oven, the test plate has three rectangular slots, and the asphalt to be tested is evenly spread in the three rectangular slots Among them, a film with a thickness of 300 μm is formed, and the test plate is kept in an oven at 150 ° C for 50 minutes, so that the change of the test bitumen is equivalent to the short-term aging effect of RTFO.

Embodiment 2

[0021] A simple aging test method equivalent to the long-term aging effect of RTFO, which consists of: a rectangular test plate and an oven, the test plate has three rectangular slots, and the asphalt to be tested is evenly spread in the three rectangular slots Among them, so as to form a film with a thickness of 300 μm, the test plate is kept in an oven at 150 ° C for 50 minutes, and then the test plate is transferred to a pressure aging container at 100 ° C for 8 hours, so that the change produced by the test bitumen is equivalent to RTFO long-term aging effects.

Embodiment 3

[0023] A simple aging test method equivalent to the long-term aging effect of PAV, which consists of: a rectangular test plate and an oven, the test plate has three rectangular slots, and the asphalt to be tested is evenly spread in the three rectangular slots Among them, so as to form a film with a thickness of 300 μm, the test plate is kept in the oven at 150 ° C for 50 minutes, and then the test plate is kept at 100 ° C in the oven for 40 hours, so that the change of the test bitumen is equivalent to PAV long-term aging effects.

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Abstract

The invention relates to a simple aging testing method equivalent to RTFO (rolling thin film oven) or PAV (pressurized aged vessel) aging effects. The existing RTFO (163 DEG C and 85min) and PAV (100DEG C and 20h) tests are still the main indoor testing methods for simulating asphalt aging; however, the prices of the RTFO and PAV instruments are high, especially imported instruments. The simple aging testing method adopts a rectangular test plate and an oven, wherein the test plate is provided with three oblong-shaped clamp grooves; after the to-be-tested asphalt is uniformly spread into thethree oblong-shaped clamp grooves, a thin film with thickness of 300mu m is formed; the temperature of the test plate is maintained for 50min in the oven at the temperature of 150 DEG C, so that the change of the tested asphalt is equivalent to the short-term aging effect of RTFO. The simple aging testing method is applied to the simple aging testing of asphalt.

Description

Technical field: [0001] The invention relates to a simple aging test method equivalent to the aging effect of RTFO or PAV. Background technique: [0002] Oxidative age hardening of asphalt mixture during construction and laying, as well as during the use of hot mix pavement, has a great influence on the performance measurement of the pavement, thereby affecting its durability. Simulating this age hardening in the laboratory is critical for developing performance-based specifications. [0003] The SHRP program proposes to use the Rotating Thin Film Oven (RTFO) test to simulate the short-term aging of asphalt during pavement construction, and to use the C Pressurized Aging Vessel (PAV) test to simulate the pavement use process. experienced long-term aging. At present, RTFO (163°C, 85 minutes) and PAV (100°C, 20 hours) tests are still the main indoor test methods for simulating asphalt aging. In recent years, with the large-scale application of modified asphalt, RTFO tests h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42
CPCG01N33/42
Inventor 计伟帅尚云龙陈彦君张文宝吴迪孙辉宇张广伟冉欣鑫付新新
Owner LONGJIAN ROAD & BRIDGE