Device for measuring combustion performance of flame-retardant asphalt

Abstract

A flame-retardant asphalt combustion performance measuring device comprises a box body and a combustion mechanism arranged outside the box body, a flame gun of the combustion mechanism horizontally extends into the box body, a smoke outlet is formed in the top of the box body and connected with a smoke detection mechanism, the flame-retardant asphalt combustion performance measuring device further comprises an asphalt block supporting mechanism arranged in the box body, and the asphalt block supporting mechanism comprises a stand column. The asphalt block supporting groove is formed in the top of the stand column, the asphalt block supporting groove is an arc-shaped groove protruding downwards, the width of the groove is matched with the thickness of an asphalt block sample, a notch is formed in the low point of the asphalt block supporting groove, and a flowing space is formed. The flame-retardant asphalt combustion test device is simple in structure, low in improvement cost and capable of effectively guaranteeing the accuracy of flame-retardant asphalt combustion test results.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of asphalt material, in particular to a kind of combustion performance determination device of flame-retardant asphalt. BACKGROUND

[0002] Flame-retardant asphalt is that using composite flame retardant, add to asphalt with certain process, so that the performance of asphalt changes, and the asphalt increases the characteristic of difficult to burn in air. Flame-retardant asphalt after adding flame retardant, in addition to substantially maintaining the performance of original matrix asphalt, also has the performance of flame retardation, and the mixture made of flame-retardant asphalt can be used for the pavement of bridge, tunnel and other high fireproof requirements. Therefore, it is necessary to test the combustion performance of flame-retardant asphalt.

[0003] Reference Figure 1 The combustion performance determination device of flame-retardant asphalt is currently widely used. The determination device of this structure fixes the asphalt block sample horizontally on the loading table by clamping, then continuously burns the surface of asphalt block sample by constant flame, and records the change of gas in the closed space of the determination device.

[0004] The local properties of asphalt block sample are changed by clamping force, and the heating range is limited, which is not conducive to accurately determining the combustion performance of flame-retardant asphalt. In addition, in the actual combustion accident, the temperature rise slope of flame-retardant asphalt system changes in steps, and the flame-retardant performance of asphalt also changes with the change of temperature. The above detection method also causes serious distortion of test results, and cannot accurately determine the combustion performance of flame-retardant asphalt.

[0005] Therefore, it is urgent for the person skilled in the art to design a method for accurately determining the combustion performance of flame-retardant asphalt. SUMMARY

[0006] The utility model discloses to the shortage of prior art, provide a kind of combustion performance determination device of flame-retardant asphalt, its structure is simple, and the transformation cost is low, can effectively guarantee the accuracy of flame-retardant asphalt combustion test result.

[0007] The technical scheme of the utility model is realized: a kind of combustion performance determination device of flame-retardant asphalt, including box, setting in the combustion mechanism of box outer, the spray gun of this combustion mechanism extends into box inside horizontally, and the top of box is provided with smoke outlet, is connected with flue gas detection mechanism, still include the asphalt block support mechanism being set in box, the asphalt block support mechanism includes stand, and the asphalt block support groove being set in the top of stand, the asphalt block support groove is the arc-shaped groove of downward convex, and groove width is adapted to the thickness of asphalt block sample, and the low point of asphalt block support groove is provided with notch, forms flow space.

[0008] The flowing space penetrates the column to the bottom of the box, and the bottom of the flowing space is provided with a residue collection tray.

[0009] The number of the columns is two, and the two columns have a spacing space, and the residue collection tray is arranged at the bottom of the spacing space.

[0010] The pitch block support groove comprises a first support groove and a second support groove, one end of the first support groove and the second support groove is fixed on the top of the corresponding column respectively, and the first support groove and the second support groove have a spacing space to form a notch.

[0011] The flame gun corresponds to the center of the pitch block.

[0012] The above technical scheme has the following beneficial effects:

[0013] 1. The flame-retardant pitch combustion performance testing device comprises a box, a combustion mechanism arranged outside the box, a flame gun of the combustion mechanism horizontally extending into the box, the flame gun of the combustion mechanism being used for spraying a flame to heat a pitch block sample, and the flame not consuming gas in the box. A smoke outlet is arranged at the top of the box and connected with a smoke detection mechanism, and the smoke detection mechanism can detect the composition in the smoke by smoke extraction. The device further comprises a pitch block support mechanism arranged in the box, the pitch block support mechanism comprising a column and a pitch block support groove arranged at the top of the column, the pitch block support groove being an arc-shaped groove protruding downward, and the groove width being adapted to the thickness of the pitch block sample. The pitch block to be tested is directly supported in the pitch block support groove and positioned, so that the problem of inaccurate test data caused by local property change of the pitch block sample clamped is avoided, and the detection data is ensured to be accurate. The low point of the pitch block support groove is provided with a notch to form a flowing space, and solid phase or liquid phase residues generated by ablation enter the flowing space through the notch under the action of gravity and are separated from the pitch block sample, so that the residues adhered to the surface of the pitch block sample are avoided to interfere, and pollution is also avoided.

[0014] 2. The flowing space penetrates the column to the bottom of the box, and the bottom of the flowing space is provided with a residue collection tray, so that the residue collection tray is convenient to take and place, and the stability of the residue collection tray is ensured.

[0015] The following further description is made in combination with the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a structural schematic view of the pitch block support mechanism of the utility model;

[0018] Figure 3 It is a connection schematic view of the first support groove and the column of the utility model;

[0019] Figure 4 The utility model discloses the cross section of various types of sample residues.

[0020] In the drawing, 1 is box body, 2 is combustion mechanism, 21 is flame gun, 3 is smoke outlet, 4 is flue gas detection mechanism, 5 is pitch block support mechanism, 6 is stand, 7 is pitch block support groove, 71 is first support groove, 72 is second support groove, 8 is notch, 9 is flowing space, 10 is residue collection tray. DETAILED DESCRIPTION

[0021] In the utility model, the combustion mechanism for using is conventional equipment, and the flue gas detection mechanism is purchased from Xinyang instrument, and the model is PY-GCMS 8900, and is connected and installed according to the guidance of the manufacturer.

[0022] Example 1

[0023] Referring to Figures 1 to 3 , the flame-retardant pitch combustion performance measuring device includes a box body 1 and a combustion mechanism 2 arranged outside the box body 1, the flame gun 21 of the combustion mechanism 2 extends horizontally into the box body 1, and a smoke outlet 3 is arranged at the top of the box body and connected with a flue gas detection mechanism 4. The device also includes a pitch block support mechanism 5 arranged in the box body, which includes a stand 6 and a pitch block support groove 7 arranged at the top of the stand, the pitch block support groove 7 is an arc-shaped groove protruding downward, and the groove width is adapted to the thickness of the pitch block sample. Obviously, the plane of the pitch block support block is vertically distributed with the extension direction of the flame gun. The low point of the pitch block support groove 7 is provided with a notch 8 to form a flowing space 9. In this embodiment, the number of stands 6 is two, and there is a spacing space between the two stands, so that the flowing space penetrates through the stand 6 to the bottom of the box body. The bottom of the flowing space 9 is provided with a residue collection tray 10. The pitch block support groove 7 includes a first support groove 71 and a second support groove 72, one end of each of the first support groove and the second support groove is fixed to the top of the corresponding stand, and there is a spacing space to form the notch 8.

[0024] Example 2

[0025] The pitch is SBS modified pitch, purchased from Sinopec, aluminum hydroxide, halloysite nanotube and ferrocene are purchased from Shandong Zhongbo New Material Co., Ltd., Shijiazhuang Dinglei Mineral Products Trade Co., Ltd. and Shanghai Aladdin Biochemical Technology Co., Ltd. respectively, and all are industrial pure.

[0026] The size specifications of the pitch block samples a, b and c used are all 100 mm in diameter and 40 mm in thickness.

[0027] The proportion of the additives of the sample a is as follows: the aluminum hydroxide content is 8 wt%, the halloysite nanotube content is 1 wt%, the ferrocene content is 1 wt%, and the rest is pitch.

[0028] The additive ratio for sample b is: 6 wt% hydroxide, 3 wt% halloysite nanotubes, 1 wt% ferrocene, and the remainder is asphalt;

[0029] Sample c uses only asphalt.

[0030] The method for determining the combustion performance of flame-retardant asphalt using the measuring apparatus of Example 1 includes the following steps:

[0031] 1) Support the prepared asphalt block sample in the asphalt block support groove with a thickness D of 40 mm and a reference burning time T of 30 min.

[0032] 2) Control the flame to spray from the flame gun and extract the gas through the exhaust port until the data from the flue gas detection agency is stable;

[0033] 3) Control the flame gun to burn the asphalt block sample, so that the surface temperature of the burning point of the asphalt block sample is 200℃, and the time is 5s;

[0034] 4) Control the flame gun to raise the temperature of the surface of the burning point of the asphalt block sample to 300℃, with a heating time of 10s and a holding time of 15s;

[0035] 5) Control the flame gun to raise the temperature of the surface of the burning point of the asphalt block sample to 400℃, with a heating time of 15s and a holding time of 25s, until the burning is complete.

[0036] 6) After the asphalt block sample has been burned, the residue is cut along the thickness direction at the burning point, and the thickness of the asphalt block sample residue at the corresponding burning point is recorded as h:

[0037] Tests showed that the residual thickness of sample a was h = 32 mm, h / D = 0.8, and based on the estimated time T = 30 minutes, it was determined to be of normal type.

[0038] The delamination thickness of sample b is h1 = 7 mm, and the residual thickness is h = 25 mm. After calculation, T*(1-a*h1 / h)*η = 30*(1-0.5x7 / 25)*25 / 26 = 24.8 minutes, T = 24.8 minutes, which belongs to the delamination type.

[0039] Sample c melted through directly. It is estimated that T is less than 5 minutes, so it belongs to the melt-through type.

[0040] Compare with Example 1

[0041] Directly 60 seconds from 150 degrees linear to 450 degrees. This test method does not conform to the actual situation, because from a single point burning to the characteristics of the rapid explosion, the former stage of slow heating, short time, the latter stage of fast heating, long time. If the standard sample is heated by the oblique line method, the bulging layer formed by the short time of halloysite nanotube decomposition and expansion is not thick enough, resulting in the wrong conclusion that the test is unqualified. Some unqualified samples, because the high temperature stage is shortened, the risk of melting through is reduced, and they are mistakenly measured as qualified products, which can easily cause problems in engineering.

[0042] Comparative Example 2

[0043] Instead of using asphalt block support blocks to support, the asphalt block sample is fixed by clamping on both sides. The clamping on both sides forms a squeezing force on the flame-retardant asphalt sample, which is equivalent to changing the non-enclosed test to an enclosed test, directly changing the mechanical boundary conditions, defining the direct jet point of the flame gun as the inner circle and the adjacent part as the outer circle. Since the outer circle is clamped, when halloysite nanotubes expand, they bulge inward to form a stacking structure on the cross section. In addition to normal bulging, there is also lateral bulging on the side, which can cause problems in the performance evaluation of flame-retardant asphalt, such as the failure of a sample that would have melted through due to the additional flame-retardant layer.

Claims

1. A flame-retardant asphalt combustion performance testing device, comprising a housing (1), a combustion mechanism (2) disposed outside the housing (1), wherein the flame gun (21) of the combustion mechanism (2) extends horizontally into the housing (1), and a smoke exhaust port (3) is provided at the top of the housing and connected to a smoke detection mechanism (4), characterized in that: Further comprising an asphalt block support mechanism (5) arranged in the box, the asphalt block support mechanism (5) comprising a column (6), and an asphalt block support groove (7) arranged at the top of the column, the asphalt block support groove (7) being a downward convex arc-shaped groove, and the groove width being adapted to the thickness of the asphalt block sample, The low point of the asphalt block support groove (7) is provided with a gap (8) to form a flowing space (9).

2. The apparatus for measuring the combustion performance of a flame- retarded bitumen according to claim 1, characterized in that: The flowing space (9) penetrates the column (6) to the bottom of the box, and the bottom of the flowing space (9) is provided with a residue collection tray (10).

3. The apparatus for measuring the combustion performance of a flame- retarded bitumen according to claim 2, characterized in that: The number of the columns (6) is two, and the two columns have a spacing space, and the residue collection tray is arranged at the bottom of the spacing space.

4. The apparatus for measuring the combustion performance of a flame- retarded bitumen according to claim 3, characterized in that: The asphalt block support groove (7) comprises a first support groove (71) and a second support groove (72), one end of each of the first support groove and the second support groove is fixed at the top of the corresponding column, and the first support groove and the second support groove have a spacing space to form the gap (8).

5. The apparatus for measuring the combustion performance of a flame- retarded bitumen according to claim 1, characterized in that: The flame gun (21) corresponds to the center of the asphalt block.

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