Test mold for testing limit oxygen index of asphalt and test method thereof

A technology for limiting oxygen index and testing, applied in the preparation of test samples, chemical analysis by combustion, sampling, etc., can solve problems such as inability to obtain accurate limit oxygen index, inability to obtain limit oxygen index, and inability to maintain an upright state , to achieve the effect of convenient maintenance and cleaning of the instrument, shortening the test time, and easy realization

Pending Publication Date: 2021-06-22
陕西交通控股集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing method is to make the asphalt into a standard strip sample first, and then use the JF-3 oxygen index tester to carry out the limit oxygen index test according to the provisions of GB2406-93. During the ignition process, the flow phenomenon is more serious, and it is impossible to maintain an upright state at all, and it has completely dripped and flowed without being ignited, and an accurate limiting oxygen index cannot be obtained.
[0006] Therefore, it is necessary to solve the problem that asphalt flows and cannot obtain accurate limiting oxygen index during the limiting oxygen index test

Method used

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  • Test mold for testing limit oxygen index of asphalt and test method thereof
  • Test mold for testing limit oxygen index of asphalt and test method thereof
  • Test mold for testing limit oxygen index of asphalt and test method thereof

Examples

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Effect test

Embodiment 1

[0041] Such as Figure 1 ~ Figure 3As shown, the trial mold 1 of the present invention includes a steel cup 1-1 and a fixing member 1-2 vertically fixedly connected to the outside of the bottom of the steel cup 1-1.

[0042] In this embodiment, the test mold 1 includes a steel cup 1-1 and a fixture 1-2 vertically fixedly connected to the outside of the bottom of the steel cup 1-1. In actual use, the steel cup 1-1 carries the asphalt 3, so that The asphalt 3 is placed in the steel cup 1-1, which avoids the occurrence of asphalt 3 flowing, solves the problem of flowing asphalt 3 directly in the limit oxygen index test, and protects the fixtures and test instruments from asphalt during the test 3. It is convenient to maintain and clean the instrument, ensuring the accuracy of the obtained limiting oxygen index data, and at the same time improving the limiting oxygen index standard in the limiting oxygen index test. By setting the fixing part 1-2 perpendicular to the steel cup 1-1...

Embodiment 2

[0048] This embodiment includes the following steps:

[0049] Step 1. Prepare the sample: put the SBS modified asphalt in an oven and keep it warm until it flows, then pour it into the steel cup 1-1 of the test mold 1 after stirring, and then insert the glass fiber 3-1 vertically into the asphalt 3 , and cooled to room temperature to obtain a test mold 1 equipped with asphalt 3; the temperature in the oven is 120°C, the cooling time is 3h, and the length of the glass fiber 3-1 is the length of the inside of the steel cup 1-1 110% of height;

[0050] Step 2, install the sample: install the test mold 1 equipped with asphalt 3 obtained in step 1 on the sample holder 2 of the combustion cylinder of the oxygen index meter to obtain the assembled combustion cylinder; The distance between test mold 1 and the upper and lower ends of the combustion cylinder is more than 10cm; the oxygen index tester is JF-3 type oxygen index tester;

[0051] Step 3, setting the volume concentration o...

Embodiment 3

[0065] This embodiment includes the following steps:

[0066] Step 1. Prepare the sample: put the SBS modified asphalt mixed with Sasobit warm mix agent into an oven and keep it in a fluid state, then pour it into the steel cup 1-1 of the test mold 1 after stirring, and then add the glass fiber 3 -1 is vertically inserted into the asphalt 3, cooled to room temperature to obtain a test mold 1 equipped with asphalt 3; the temperature in the oven is 100°C, and the cooling time is 2h; the length of the glass fiber 3-1 105% of the internal height of steel cup 1-1;

[0067] Step 2, install the sample: install the test mold 1 equipped with asphalt 3 obtained in step 1 on the sample holder 2 of the combustion cylinder of the oxygen index meter to obtain the assembled combustion cylinder; The distance between test mold 1 and the upper and lower ends of the combustion cylinder is more than 10cm; the oxygen index tester is JF-3 type oxygen index tester;

[0068] Step 3, setting the vol...

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Abstract

The invention provides a test mold for testing the limit oxygen index of asphalt. The test mold comprises a steel cup and a fixing piece which is vertically and fixedly connected to the outer side of the bottom of the steel cup. In addition, the invention also discloses a method for testing the limit oxygen index of asphalt, and the limit oxygen index of asphalt is obtained by preparing the sample, installing the sample, setting the volume concentration of oxygen in the combustion cylinder, adjusting the atmosphere in the combustion cylinder and igniting the sample. The cavity for containing the asphalt inserted with the glass fibers is formed in the steel cup, the problem that strip-shaped asphalt directly used in a limit oxygen index test flows is solved, a clamp and an instrument are protected against asphalt in the test process, the asphalt is rapidly ignited by inserting the glass fibers into the asphalt, the test time is shortened, and the test efficiency is improved. The combustion area of the asphalt is increased, the combustion time of the asphalt is prolonged, the limit oxygen index precision is improved, and meanwhile, the limit oxygen index standard in a limit oxygen index test is improved.

Description

technical field [0001] The invention belongs to the technical field of asphalt limiting oxygen index, and in particular relates to a test mold for asphalt limiting oxygen index test and a test method thereof. Background technique [0002] Asphalt is a dark brown complex mixture composed of hydrocarbons of different molecular weights and their non-metallic derivatives. It is a kind of high-viscosity organic liquid and can be mainly divided into coal tar pitch, petroleum pitch and natural pitch. Asphalt is mainly used in coatings, plastics, rubber and other industries as well as paving roads. [0003] Due to the large difference between asphalt materials and plastics in the heated state, in actual use, it is necessary to conduct a limiting oxygen index test on asphalt materials to determine its practical performance. [0004] In actual tests, the oxygen index method is usually used to measure the flammability to represent the flame retardancy of asphalt materials. The limiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/12G01N1/36
CPCG01N31/12G01N1/36G01N2001/366
Inventor 郝培文赵超志王春李宁博李德文侯宁宁
Owner 陕西交通控股集团有限公司
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