Asphalt test piece preparation method for oxygen index test

Abstract

The invention relates to an asphalt test piece preparation method for asphalt oxygen index test. An asphalt test piece preparation process comprises the following steps of heating SBS (Styrene Butadiene Styrene) modified asphalt to a molten state, weighing 70 parts by weight of asphalt, uniformly mixing the asphalt and mineral powder, a weight ratio of the asphalt to the mineral powder being 1:1 to 1:1.5, then weighing and adding 0.3 percent of wood fibers into asphalt mortar formed by the asphalt and the mineral powder, performing uniform stirring by virtue of a high-speed shearing machine, pouring the asphalt mortar into a die to prepare an asphalt test piece, wherein a test piece, i.e. the asphalt test piece, which is 150mm long, 5mm wide and 2 to 5mm thick is prepared from the molten asphalt mortar. The invention relates to the asphalt test piece preparation method for oxygen index test, and when an oxygen index of the asphalt is tested by the method, the problems of serious burning and flowing of the asphalt and difficulty in cleaning of an apparatus can be solved, flame resistance of various kinds of flame-resistant modified asphalt can be quantitatively evaluated, and experiment operation can be standardized.

Description

【Technical field】 [0001] The invention relates to a method for preparing an asphalt test piece for oxygen index testing, in particular to a method for testing the flame retardancy of flame retardant asphalt. 【Background technique】 [0002] Asphalt is a flammable material that emits a large amount of smoke and toxic gases during combustion. Especially in long tunnels where the space is relatively closed, the gas, smoke and heat generated by the burning of asphalt pavement are difficult to dissipate, which makes it difficult for people to escape after a fire accident. cause catastrophic accidents. In order to meet the application of asphalt concrete on tunnel pavement, flame-retardant asphalt and its concrete have been initially applied in some tunnel projects at home and abroad. [0003] The burning process of asphalt first melts, drips, and flows, followed by the burning of molten beads, and then the burning molten beads sprinkle and flow, causing the fire to spread and exp...

AI Technical Summary

Problems solved by technology

[0012] In the industry standard, it uses a single layer of glass fiber mat to make asphalt specimens to detect oxygen index, because when using glass fiber mat to prepare asphalt sample, the glass fiber only plays a supporting role, and the oxygen index is measured by simply burning asphalt. On the one hand, the combustion process of asphalt on the pavement cannot be well reflected; on the other hand, the flow of asphalt during the test process will greatly affect the test results, and will also cause serious pollution to the test equipment, which will bring great inconvenience to the test work

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