A design method for fresh-mixed fog seal mortar that balances homogeneity and fluidity

Abstract

The present invention discloses a design method for freshly mixed fog-sealing mortar that can balance homogeneity and fluidity. The design method includes the following steps: Step 1: Determine the test formula design scheme: Use the I-optimal split-plot response surface design method to determine the water content γw, filler content γf, and sand content γs as control factor variables, design test points with a good spatial distribution state, and independently evaluate the influence of each control variable on the response value; Step 2: Evaluate the workability of freshly mixed fog-sealing mortar: Use a freshly mixed fog-sealing mortar workability test device to measure the homogeneity and fluidity of the freshly mixed fog-sealing mortar respectively. The present invention provides a workability test device for freshly mixed fog-sealing mortar, which consists of a storage unit and a fluidity test unit. It is easy to assemble and disassemble, convenient to operate, and can quickly and accurately reflect the homogeneity and fluidity of freshly mixed fog-sealing mortar. It is a useful supplement to existing specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of pavement maintenance, and in particular to a design method for freshly mixed fog sealing mortar capable of balancing homogeneity and fluidity. Background Art

[0002] With the improvement of the quality of raw materials for roads, the optimization of structural design and the effective control of overloaded vehicles, the early forms of asphalt pavement diseases have gradually changed from structural damage such as potholes and rutting to surface functional damage such as microcracks and anti-skid attenuation. Sand-containing fog seal is a common asphalt pavement repair technology that can effectively fill microcracks on the road surface and inhibit the loosening of aggregates. It is suitable for preventive maintenance in various scenarios such as highways, airports, and tunnels. In order to ensure good fluidity, the sand-containing fog seal is in a fluid mortar state during construction, that is, freshly mixed fog seal mortar. Freshly mixed fog seal mortar is composed of fog seal mortar and fine sand. The fog seal mortar is generally composed of modified emulsified asphalt, clay, water and polymer additives. Fine sand is added at the construction site to form fog seal mortar, and a high-pressure spreader is used to spray it onto the road surface to achieve the maintenance effect.

[0003] Due to the large differences in the properties of the constituent materials of the sand-containing fog seal layer, the following problems often exist in the preparation and construction of the freshly mixed fog seal mortar:

[0004] ① Due to the lack of a reasonable basis for formula design, freshly mixed fog seal mortar is prone to segregation, water seepage, insufficient fluidity, and rapid demulsification of emulsified asphalt, which in turn cause nozzle blockage, uneven spreading, and poor film formation; ② Freshly mixed fog seal mortar has the properties of both binder and mixture, and its rheological properties directly affect the maintenance effect of the spreading construction seal layer. There is a lack of effective design methods to ensure that the freshly mixed fog seal layer maintains rheological properties that are conducive to spreading construction; ③ There is currently a lack of standard specifications for the construction and workability of sand-containing fog seal layers, and it is impossible to objectively evaluate the key properties of freshly mixed fog seal mortar such as fluidity, permeability, and homogeneity. The influence of material components on various performance properties is not yet clear, and it is difficult to effectively balance the homogeneity and fluidity of freshly mixed fog seal mortar.

[0005] Therefore, it is necessary to provide a design method for freshly mixed fog seal mortar that can balance homogeneity and fluidity to solve the above technical problems. Summary of the Invention

[0006] The object of the present invention is to provide a design method for freshly mixed fog seal mortar that can balance homogeneity and fluidity, so as to solve the problems existing in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a design method for freshly mixed fog seal mortar that can balance homogeneity and fluidity, the design method comprising the following steps:

[0008] Step 1: Determine the experimental formula design

[0009] Freshly mixed fog seal mortar generally consists of emulsified asphalt, water, fillers, sand, defoamers, and dispersants. Emulsified asphalt, typically modified asphalt, is the base material for preparing fog seal mortar. It exhibits excellent fluidity and storage stability, meeting the requirements of cold patch construction and aggregate bonding. Water is used to improve the dispersion of other components in the emulsified asphalt and adjust the mortar's consistency. Mineral soils with good adsorption and thixotropy are often used as fillers to adjust the rheological properties of freshly mixed fog seal mortar, improve storage stability, and prevent segregation. Sand is generally quartz sand with a high adhesion grade and a particle size of 30-70 mesh to enhance the anti-slip properties of the sand-containing fog seal layer. Defoamers and dispersants are used to improve the dispersion of the various components in the fog seal mortar system, preventing foaming and rapid loss of fluidity during the preparation process. When designing the formula, the amount (volume) of emulsified asphalt is used as the benchmark, the volume of water is 10-40% of the amount of emulsified asphalt (continuous variable), the volume of filler is 15-30% of the amount of emulsified asphalt (continuous variable), the volume of sand is 15%, 20%, 25% and 30% of the amount of emulsified asphalt (discrete variable), and the volume of defoamer and dispersant each accounts for 1% of the amount of emulsified asphalt, and this amount remains constant.

[0010] Based on the I-optimal design principle, water content γw, filler content γf, and sand content γs are determined as control factor variables, and test points with a good spatial distribution are designed. This can avoid problems such as excessive test volume caused by traditional design methods (comparative design method), increased test error due to marginal effects (randomized block design), and lack of result prediction (D-optimal design method).

[0011] Step 2: Test device and evaluation method for the workability of freshly mixed fog seal mortar

[0012] A workability test device for freshly mixed fog seal mortar is used to measure the fluidity and storage uniformity of the freshly mixed fog seal mortar respectively. The workability test device for freshly mixed fog seal mortar consists of a storage unit and a fluidity test unit. The storage unit includes an annular side wall, the top of the annular side wall is connected to a storage unit plug-in plate, the bottom of the annular side wall is provided with an annular slot, the bottom of the outer circumference of the annular side wall is provided with a rotatable knob, the interior of the annular side wall is provided with a rotating plate and connected to the knob, the fluidity test unit includes a cylindrical flow trough, the top of the cylindrical flow trough is provided with a fluidity test unit plug-in plate, the fluidity test unit plug-in plate is clamped to the bottom of the annular side wall through the annular slot, the bottom of the cylindrical flow trough is fixedly provided with an inclined flow trough, and the bottom of the inclined flow trough is provided with a drainage hole.

[0013] Homogeneity evaluation method: Pour the freshly mixed fog seal mortar into the storage unit with the liquid level flush with the opening. Assemble three storage units from top to bottom, turn the knobs of the two storage units on the top to make the mortar connected. After the mortar has been left to stand for 24 hours, turn the knobs of the two storage units on the top so that the turn plate and the annular side wall are vertical. Remove the three storage units in turn and weigh them, recorded as m1, m2, and m3. Calculate the mortar homogeneity Um according to the following formula. The closer the value of Um is to 1, the better the homogeneity of the freshly mixed fog seal mortar.

[0014]

[0015] In the formula, max(m1, m2, m3) is the maximum value of the weight of the three storage units, min(m1, m2, m3) is the minimum value of the weight of the three storage units, and is the average value of the weight of the three storage units.

[0016] Fluidity evaluation method: Pour the freshly mixed fog seal mortar into the storage unit with the liquid level flush with the opening, and install the fluidity test unit at the bottom of the storage unit; after the mortar stabilizes, turn the knob to make the mortar flow along the cylindrical flow channel and inclined flow channel of the fluidity test unit, and record the time Ft from the beginning of mortar flowing out from the leakage hole to the complete outflow, which is used as the fluidity evaluation index of the freshly mixed fog seal mortar.

[0017] Step 3: Determine the material formulation optimization design range based on performance requirements

[0018] The key to controlling the formula of freshly mixed fog-sealing mortar is to balance its homogeneity and fluidity. It should maintain sufficient consistency for good storage stability and sufficient fluidity to ensure the grouting effect. According to the actual construction requirements, the minimum acceptance values of the homogeneity index Um and the fluidity index Ft are specified. Based on the test grouping designed in step one, workability tests are carried out separately and the test results are statistically analyzed. According to the control range of the minimum acceptance value of workability, the workability performance under various formula combinations is observed and predicted to obtain a performance distribution map; finally, based on the satisfaction theory, the design scheme of freshly mixed fog-sealing mortar that can balance fluidity and homogeneity is determined. The greater the satisfaction D, the better the performance balance of the formula.

[0019]

[0020] Where D is the satisfaction function, dU is the satisfaction of the homogeneity index, and dF is the satisfaction of the fluidity index.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention provides a workability test device for freshly mixed fog seal mortar, which consists of a storage unit and a fluidity test unit. It is easy to assemble and disassemble, convenient to operate, and can quickly and accurately reflect the homogeneity and fluidity of freshly mixed fog seal mortar, which is a useful supplement to existing specifications.

[0023] 2. The present invention provides a design method for freshly mixed fog seal mortar that can balance homogeneity and fluidity. It can provide a reasonable design scheme for freshly mixed fog seal mortar based on a new test device and design method, avoiding the blindness and limitations of traditional design methods, and can flexibly adjust the material formula according to construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the homogeneity testing device for freshly mixed fog seal mortar provided by the present invention;

[0025] Figure 2 A schematic structural diagram of a fluidity testing device for freshly mixed mist seal mortar provided by the present invention;

[0026] Figure 3 is a structural diagram of a storage unit;

[0027] Figure 4 for Figure 3 a bottom view of the storage unit shown;

[0028] Figure 5 It is a structural diagram of the fluidity test unit;

[0029] Figure 6 for Figure 5 A top view of the flowability test unit shown;

[0030] Figure 7 is the spatial distribution map of the test points of each control variable;

[0031] Figure 8 This is the distribution diagram of workability satisfaction of freshly mixed fog seal mortar (Um>0.9, Ft<20s);

[0032] Figure 9 This is the distribution diagram of workability satisfaction of freshly mixed fog seal mortar (Um>0.85, Ft<25s);

[0033] Figure 10 This is the distribution diagram of workability satisfaction of freshly mixed fog seal mortar (Um>0.80, Ft<30s).

[0034] In the figure: 1. Storage unit plug-in plate; 2. Annular side wall; 3. Rotating plate; 4. Knob; 5. Annular slot; 6. Flowability test unit plug-in plate; 7. Cylindrical flow channel; 8. Inclined flow channel; 9. Drain hole. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, detachably connected, or connected in one piece; they can be mechanically connected or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following describes an embodiment of the present invention based on its overall structure.

[0037] See also Figure 1-10 A method for designing fresh fog seal mortar that balances homogeneity and fluidity includes the following steps:

[0038] Step 1: Determine the experimental formula design scheme: Taking the amount (volume) of emulsified asphalt as the benchmark, the volume of water is 10-40% of the amount of emulsified asphalt (continuous variable), the volume of filler is 15-30% of the amount of emulsified asphalt (continuous variable), the volume of sand is 15%, 20%, 25% and 30% of the amount of emulsified asphalt (discrete variable), the volume of defoamer and dispersant each accounts for 1% of the amount of emulsified asphalt, and the amount remains constant. The I-optimal split-plot response surface design method is used to determine the water content γw, filler content γf, and sand content γs as control factor variables, design test points with good spatial distribution, and independently evaluate the influence of each control variable on the response value.

[0039] Preferably, based on the T-optimal design principle, 26 experimental groups (as shown in Table 1) are generated, including 3 replicate groups to reduce experimental errors. Figure 7It is a spatial distribution diagram of the test points of each control factor variable, and the FDS diagram provides a single-line profile of the predicted variance value in the design space, which is used to verify the rationality of the design space selection.

[0040] Table 1 Design scheme for fresh-mixed fog seal mortar test based on I-optimal design principle

[0041]

[0042]

[0043] Step 2: Workability evaluation of freshly mixed fog sealing mortar: Use freshly mixed fog sealing mortar workability test device to measure the homogeneity and fluidity of freshly mixed fog sealing mortar.

[0044] Homogeneity evaluation method: Pour the freshly mixed fog seal mortar into the storage unit until the liquid level is flush with the opening. Assemble the three storage units from top to bottom and turn the knobs 4 of the two upper storage units to connect the mortar. After the mortar has been allowed to stand for 24 hours, turn the knobs 4 of the two upper storage units until the rotating plate 3 and the annular side wall 2 are perpendicular. Remove the three storage units in turn and weigh them, recording them as m1, m2, and m3. Calculate the mortar homogeneity Um (dimensionless) according to the following formula. The closer the value of Um is to 1, the better the homogeneity of the freshly mixed fog seal mortar.

[0045]

[0046] In the formula, max(m1, m2, m3) is the maximum value of the weight of the three storage units, min(m1, m2, m3) is the minimum value of the weight of the three storage units, and is the average value of the weight of the three storage units.

[0047] Fluidity evaluation method: Pour the freshly mixed fog seal mortar into the storage unit with the liquid level flush with the opening, and install the fluidity test unit at the bottom of the storage unit; after the mortar stabilizes, turn the knob 4 to make the mortar flow along the cylindrical flow channel 7 and the inclined flow channel 8 of the fluidity test unit, and record the time Ft (unit: second) from the beginning of the mortar flowing out from the leakage hole 9 to the complete outflow, which is used as the fluidity evaluation index of the freshly mixed fog seal mortar.

[0048] Step 3: Determine the material formulation optimization design range based on performance requirements:

[0049] The key to controlling the formula of freshly mixed fog-sealing mortar is to balance its homogeneity and fluidity, maintaining sufficient consistency for good storage stability while also having sufficient fluidity to ensure the grouting effect. According to actual construction requirements, the minimum acceptance values of the homogeneity index Um and the fluidity index Ft are specified. Based on the test groups designed in step one, workability tests are carried out separately, and the test results are statistically analyzed. According to the control range of the minimum acceptance value of workability, the workability performance under various formula combinations is observed and predicted to obtain a performance distribution map; finally, based on the satisfaction theory, the design scheme of freshly mixed fog-sealing mortar that can balance fluidity and homogeneity is determined. The greater the satisfaction D, the better the performance balance of the formula.

[0050]

[0051] Where D is the satisfaction function, dU is the satisfaction of the homogeneity index, and dF is the satisfaction of the fluidity index.

[0052] Among them, step 2 adopts a kind of freshly mixed mist seal mortar workability test device, which consists of a storage unit and a fluidity test unit. The storage unit includes an annular side wall 2, the top of the annular side wall 2 is connected with a storage unit plug-in plate 1, the bottom of the annular side wall 2 is provided with an annular slot 5, the bottom of the outer circumference of the annular side wall 2 is provided with a rotatable knob 4, the interior of the annular side wall 2 is provided with a rotating plate 3 and connected to the knob 4, the fluidity test unit includes a cylindrical flow trough 7, the top of the cylindrical flow trough 7 is provided with a fluidity test unit plug-in plate 6, and the fluidity test unit plug-in plate 6 is clamped to the bottom of the annular side wall 2 through the annular slot 5. An inclined flow trough 8 is fixedly installed at the bottom of the cylindrical flow trough 7, and a drainage hole 9 is opened through the bottom of the inclined flow trough 8. The storage unit plug-in plate 1 can be inserted into the annular slot 5 for splicing and assembling multiple storage units. The knob 4 is connected to the rotating plate 3, and the rotating plate 3 can rotate with the knob 4 for storing and circulating mortar. The rotating plate 3 is consistent with the inner diameter of the annular side wall 2, and the edge is sealed by a rubber ring to ensure that the mortar does not leak during the storage stage. The fluidity test unit plug-in plate 6 can be inserted into the annular slot 5 of the storage unit. After the storage unit and the fluidity test unit are assembled, the fluidity of the mortar can be evaluated by the time it takes for the mortar to circulate through the drainage hole 9.

[0053] Preferably, the annular side wall 2 of the storage unit has an inner diameter of 10 cm, an outer diameter of 11 cm, and a height of 15 cm. The inserting plate 1 is semicircular, 0.25 cm thick, and 3 cm high. Similarly, the annular slot 5 is 0.25 cm wide and 3 cm deep.

[0054] Preferably, the cylindrical flow channel 7 of the fluidity test unit has an inner diameter of 10 cm, an outer diameter of 11 cm, and a height of 5 cm. The insert plate 6 has the same size as the insert plate 1. The inclined flow channel 8 has a height of 5 cm, an upper aperture of 10 cm, and a discharge hole 9 with an aperture of 1 cm.

[0055] Example 1

[0056] See also Figure 1-10 , according to step 1, 26 formula test groups were configured to obtain new fog seal mortar samples with different workability. Subsequently, according to step 2, the workability and fluidity of the mortar were tested and recorded, as shown in Table 2.

[0057] Homogeneity evaluation: Pour the freshly mixed fog seal mortar into the storage unit until the liquid level is flush with the opening. Assemble the three storage units from top to bottom and turn the knobs 4 of the two upper storage units to connect the mortar. After the mortar has been allowed to stand for 24 hours, turn the knobs 4 of the two upper storage units until the rotating plate 3 and the annular side wall 2 are perpendicular. Remove the three storage units in turn and weigh them, recording them as m1, m2, and m3. Calculate the mortar homogeneity Um (dimensionless) according to the following formula. The closer the value of Um is to 1, the better the homogeneity of the freshly mixed fog seal mortar.

[0058] Fluidity evaluation method: Pour the freshly mixed mist seal mortar into the storage unit with the liquid level flush with the opening, and install the fluidity test unit at the bottom of the storage unit; after the mortar stabilizes, turn the knob 4 to make the mortar flow along the cylindrical flow channel 7 and the inclined flow channel 8 of the fluidity test unit, and record the time Ft (unit: second) from the beginning of the mortar flowing out from the drain hole 9 to the complete outflow.

[0059] Table 2 Workability test results of the freshly mixed fog seal mortar test group

[0060]

[0061]

[0062] According to actual construction requirements, the minimum acceptable value of homogeneity is U m >0.9, the expected value is 1; the minimum acceptable value of liquidity is F t <20s, the expected value is 5s. Based on the workability test results, calculate the workability satisfaction of different freshly mixed fog seal mortar formulas, such as Figure 8 shown.

[0063] In this embodiment, the highest workability satisfaction is 0.842, that is, when D = 0.842, the homogeneity and fluidity of the freshly mixed fog seal mortar can be balanced to the greatest extent. The recommended formula is: emulsified asphalt content 100% (based on its volume), water content 4.2%, filler content 15%, sand content 18.5%, defoamer 1% and dispersant 1%.

[0064] Example 2

[0065] See also Figure 1-10, which is different from Example 1: According to the actual construction requirements, the minimum acceptable value of homogeneity is Um>0.85, and the expected value is 1; the minimum acceptable value of fluidity is Ft<25s, and the expected value is 5s. Based on the workability test results, the workability satisfaction of different freshly mixed fog seal mortar formulas is calculated, such as Figure 9 shown.

[0066] In this embodiment, the highest workability satisfaction is 0.854, that is, when D = 0.854, the homogeneity and fluidity of the freshly mixed fog seal mortar can be balanced to the greatest extent. The recommended formula is: emulsified asphalt content 100% (based on its volume), water content 10.9%, filler content 15%, sand content 19.3%, defoamer 1% and dispersant 1%.

[0067] Example 3

[0068] See also Figure 1-10 , which is different from the above embodiment: according to the actual construction requirements, the minimum acceptable value of homogeneity is Um>0.80, and the expected value is 1; the minimum acceptable value of fluidity is Ft<30s, and the expected value is 5s. Based on the workability test results, the workability satisfaction of different freshly mixed fog seal mortar formulas is calculated, such as Figure 10 shown.

[0069] In this embodiment, the highest workability satisfaction is 0.951, that is, when D = 0.951, the homogeneity and fluidity of the freshly mixed fog seal mortar can be balanced to the greatest extent. The recommended formula is: emulsified asphalt content 100% (based on its volume), water content 17.5%, filler content 15%, sand content 19.6%, defoamer 1% and dispersant 1%.

[0070] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A design method for freshly mixed fog seal mortar that can balance homogeneity and fluidity, the design method comprising the following steps: Step 1: Determine the experimental formulation design: Use the I-optimal split-plot response surface design method to determine water content γw, filler content γf, and sand content γs as control factor variables, design test points with a good spatial distribution state, and independently evaluate the impact of each control variable on the response value; Step 2: Workability evaluation of freshly mixed fog seal mortar: Use freshly mixed fog seal mortar workability test device to measure the homogeneity and fluidity of freshly mixed fog seal mortar; Step 3: Determine the optimal design range of material formula according to performance requirements: Based on the test groups designed in step 1, conduct workability tests separately and collect statistical test results; According to actual construction requirements, the minimum acceptable values of the homogeneity index Um and the fluidity index Ft are specified. The workability performance under various formula combinations is observed and predicted, and a performance distribution map is obtained. The formula is then determined based on the satisfaction level. When designing the formula in the step 1, based on the amount (volume) of emulsified asphalt, the volume of water is 10-40% (continuous variable) of the amount of emulsified asphalt, the volume of filler is 15-30% (continuous variable) of the amount of emulsified asphalt, the volume of sand is 15%, 20%, 25% and 30% (discrete variable) of the amount of emulsified asphalt, and the volume of defoamer and dispersant each accounts for 1% of the amount of emulsified asphalt, and the amount is kept constant; The workability test device for freshly mixed fog seal mortar consists of a storage unit and a fluidity test unit, wherein the storage unit comprises an annular side wall (2), the top of the annular side wall (2) is connected to a storage unit plug plate (1), the bottom of the annular side wall (2) is provided with an annular slot (5), a rotatable knob (4) is installed at the bottom of the outer peripheral surface of the annular side wall (2), and a rotating plate (3) is installed inside the annular side wall (2) and is connected to the knob (4).

2. A method for designing fresh spray seal mortar capable of balancing homogeneity and fluidity according to claim 1, characterized in that: The fluidity testing unit comprises a cylindrical flow trough (7), a fluidity testing unit insert plate (6) is installed on the top of the cylindrical flow trough (7), the fluidity testing unit insert plate (6) is clamped to the bottom of the annular side wall (2) through an annular slot (5), an inclined flow trough (8) is fixedly installed on the bottom of the cylindrical flow trough (7), and a drainage hole (9) is opened through the bottom of the inclined flow trough (8).

3. A method for designing fresh spray seal mortar capable of balancing homogeneity and fluidity according to claim 1, characterized in that: The homogeneity evaluation method in the step 2 is as follows: pour the freshly mixed fog seal mortar into the storage unit, the liquid level is flush with the opening, assemble three storage units from top to bottom, turn the knobs (4) of the two storage units on the top to make the mortar in a connected state, and after the mortar is left to stand for 24 hours, turn the knobs (4) of the two storage units on the top, the rotating plate (3) and the annular side wall (2) are in a vertical state, remove the three storage units in turn and weigh them, record them as m1, m2, m3, and calculate the mortar homogeneity Um. The closer the value of Um is to 1, the better the homogeneity of the freshly mixed fog seal mortar.

4. A method for designing fresh mist seal mortar capable of balancing homogeneity and fluidity according to claim 1, characterized in that: The fluidity evaluation method in step 2 is as follows: pour the freshly mixed fog seal mortar into the storage unit, with the liquid level flush with the opening, and install a fluidity test unit at the bottom of the storage unit. After the mortar is stable, turn the knob (4) to make the mortar flow along the cylindrical flow groove (7) and the inclined flow groove (8) of the fluidity test unit, and record the time Ft from the mortar starting to flow out from the discharge hole (9) to the time the mortar completely flows out, as the fluidity evaluation index of the freshly mixed fog seal mortar.

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