Slope protection spray protection material, manufacturing method and application

Abstract

The application discloses a kind of slope protection spray protection materials, manufacturing method and application.The slope protection spray protection material is formed by components including cement, water, sand, modified bamboo bone filler, pig hair fiber and anionic polymer substance;Wherein, the mass ratio of cement, water, sand, modified bamboo bone filler and pig hair fiber is 1:0.4~0.6:1.01~1.43:0.5~0.75:0.003~0.005;The mass ratio of anionic polymer substance and cement is 0.003~0.005:1;Modified bamboo bone filler is obtained by bamboo bone filler through preservative solution soaking, drying, and then through water-based polyurethane solution soaking, drying.The slope protection spray protection material of the application is green in environmental protection, small in self weight, easy to combine with rock slope surface, not easy to slip and slide, and the formed protection layer basically does not appear shrinkage cracking phenomenon.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of slope protection with spray protection material, manufacturing method and application, specifically relates to a kind of slope spray protection with pig hair fiber bamboo aggregate concrete, manufacturing method and application. BACKGROUND

[0002] China's terrain is mountainous, when the structure such as highway, urban road, housing construction is built, the original topography will be changed, the mountain is excavated, and then more excavation side slope appears.The excavated mountain slope is exposed to the atmosphere, for the weathered rock slope, the rock surface is eroded by atmospheric factors, including wind, sun, rain and the repeated periodic change of temperature, which makes the rock of side slope weathered, and then appears spalling and sporadic chunk, which affects the traffic function of road, and causes safety hazards to pedestrians and vehicles around.

[0003] Therefore, the excavated side slope needs to be protected, the purpose is to isolate the erosion of atmospheric factors (mainly including air, water, temperature, sunlight, etc.) to rock slope, and then prevent the weathering and falling of rock of side slope.

[0004] For the excavation side slope formed in the construction of mountainous highway, urban road and housing building, the slope rate is not steeper than 1:0.5, and the weathered rock slope can be protected by spray protection method.

[0005] The commonly used spray protection material is gravel aggregate, which is mixed with cement, sand and water to form a slurry, and then sprayed onto the rock slope surface by a spraying machine to form a slope protection layer with a thickness of not less than 8 cm. Because of the large energy consumption in mining and processing of gravel materials, a large amount of carbon dioxide is discharged, which has a great impact on the environment. In addition, the self-weight of gravel is relatively large, and when forming the spray protection layer, the gravel is prone to slip and even fall due to its large self-weight, which makes the combination with the slope surface not firm, resulting in uneven thickness of the protection layer and affecting the protection effect. In addition, the protection layer formed by traditional cement concrete spray protection material is prone to shrinkage cracking. SUMMARY

[0006] Therefore, one object of the present application is to provide a slope protection spray protection material which is environmentally friendly, light in weight, easy to combine with the rock slope, not easy to slip, and the spray protection layer formed thereby basically does not have shrinkage cracking phenomenon. Another object of the present application is to provide a manufacturing method of the slope protection spray protection material as described above. Still another object of the present application is to provide an application of pig hair fiber in improving the strength of slope protection spray protection material.

[0007] The present application achieves the above-mentioned objects by adopting the following technical solutions.

[0008] In one aspect, the present application provides a slope protection spray protection material formed by components including cement, water, sand, modified Dendrocalamus latiflorus aggregate, pig hair fiber and anionic polymer substance;

[0009] The mass ratio of the cement, water, sand, modified Dendrocalamus latiflorus aggregate and pig hair fiber is 1:0.4-0.6:1.01-1.43:0.5-0.75:0.003-0.005;

[0010] The mass ratio of the anionic polymer substance and the cement is 0.003-0.005:1;

[0011] The modified Dendrocalamus latiflorus aggregate is obtained by soaking the Dendrocalamus latiflorus aggregate in a preservative solution, drying, and then soaking in a water-based polyurethane solution and drying. The protection layer formed by the slope protection spray protection material is environmentally friendly, low-carbon and light in weight, and is easy to combine with the rock slope, overcoming the shortcomings of the traditional concrete spray protection material, such as the large self-weight of the stone causing sliding or even falling, resulting in uneven thickness of the protection layer, and being prone to shrinkage cracking.

[0012] In the present application, the cement can be common Portland cement or ordinary Portland cement. The fineness modulus of the sand should be greater than 2.5, and the particle size of the particles less than 0.075 mm should be no more than 20%.

[0013] According to one embodiment of the present application, the mass ratio of the cement, water, sand, modified Dendrocalamus latiflorus aggregate and pig hair fiber is 1:0.4-0.5:1.01-1.43:0.5-0.75:0.004-0.005. According to another embodiment of the present application, the mass ratio of the cement, water, sand, modified Dendrocalamus latiflorus aggregate and pig hair fiber is 1:0.45-0.56:1.10-1.43:0.54-0.7:0.004-0.005.

[0014] In some embodiments, the slope protection spray protection material of the present application is formed only by cement, water, sand, modified Dendrocalamus latiflorus aggregate, pig hair fiber and anionic polymer substance. If the ratio is not within the range of the present application, the compressive strength and splitting tensile strength cannot be better balanced.

[0015] According to one embodiment of the present application, the modified Dendrocalamus latiflorus aggregate is prepared by the following steps: (1) cutting Dendrocalamus latiflorus with a growth age of 3-5 years into aggregate particles in the shape of a cube or a cube-like shape, or wedge-shaped aggregate particles, with a particle edge length of 5-10 mm; (2) soaking the cut Dendrocalamus latiflorus aggregate in a CCA wood preservative solution, then taking it out and drying to obtain a corrosion-resistant Dendrocalamus latiflorus aggregate; and (3) soaking the corrosion-resistant Dendrocalamus latiflorus aggregate in a water-based polyurethane solution, then taking it out and drying to obtain the modified Dendrocalamus latiflorus aggregate.

[0016] In step (2), the soaking can be performed at room temperature. The soaking time can be 12-48 h, preferably 20-24 h. The drying includes a first drying and a second drying. The temperature of the first drying can be 95-105 DEG C, preferably 100-105 DEG C, and the time of the first drying can be 30-90 min, preferably 60-90 min. The temperature of the second drying can be 20-75 DEG C, preferably 65-75 DEG C, and the second drying makes the corrosion-resistant bamboo-chute aggregate reach a constant weight.

[0017] In some embodiments, the second drying can be natural air-drying in good weather conditions.

[0018] In step (3), the soaking can be performed at room temperature. The soaking time can be 20-24 h. The drying includes a third drying and a fourth drying. The temperature of the third drying can be 95-105 DEG C, preferably 100-105 DEG C, and the time of the third drying can be 30-90 min, preferably 60-90 min. The temperature of the fourth drying can be 20-75 DEG C, preferably 65-75 DEG C, and the fourth drying makes the modified bamboo-chute aggregate reach a constant weight. In some embodiments, the fourth drying can be natural air-drying in good weather conditions.

[0019] In the present application, the modified bamboo-chute aggregate is used to replace the gravel as the aggregate of the spray protection material, which can not only make the formed spray protection layer have a small self-weight and be easily combined with the rock slope surface, but also can reduce the exploitation of stone materials and save energy consumption, thereby achieving the purpose of low-carbon and environmental protection.

[0020] It is found in the present application that the particle-shaped bamboo-chute aggregate can improve the corrosion resistance by using the CCA wood preservative solution for corrosion treatment, and can reduce the water absorption, improve the alkali resistance, and further increase the durability by using the water-based polyurethane solution for treatment, and can also enhance the bonding strength with the cement mortar. The modified bamboo-chute aggregate and the specific application of the present application are more conducive to taking into account the compressive strength and splitting tensile strength. The modified bamboo-chute aggregate prepared in CN116514430A has a large water absorption, and although the compressive strength is acceptable, the tensile strength still needs to be improved, and cracks are prone to occur. In addition, the modifier in CN116514430A has a high cost, and the corrosion resistance is not as good as the CCA wood preservative when used in outdoor environment.

[0021] According to the spray protection material for slope protection, the mass ratio of cement, water, sand, modified bamboo-chute aggregate and pig hair fiber is preferably 1:0.4-0.5:1.01-1.43:0.5-0.7:0.003-0.005. In this way, the spray protection material for slope protection can have high compressive strength and tensile strength after forming the bamboo-chute aggregate concrete.

[0022] Preferably, the anionic polymer is xanthan gum. Xanthan gum is a kind of high viscosity water-soluble microbial polysaccharide which is made of starch as the main raw material, through specific biological fermentation and ethanol purification, drying and crushing.

[0023] Preferably, the Dendrocalamus latiflorus aggregate is in the shape of a cube or a wedge, and the side length is 5-10 mm; the length of the pig hair fiber is 20-30 mm.

[0024] Preferably, the preservative solution is a CCA type wood preservative solution. The preservative solution is obtained by diluting the purchased preservative with water, and the volume ratio of the preservative to water can be 1:12-15. In this way, the corrosion resistance of the Dendrocalamus latiflorus aggregate can be increased.

[0025] Preferably, the water-based polyurethane solution is obtained by diluting polyurethane emulsion with water, wherein the molecular weight of the polyurethane emulsion is greater than 5000; and the mass concentration of the polyurethane emulsion is 10-25 wt%. For example, the mass concentration of the polyurethane emulsion can be 16.7 wt%. The volume ratio of the polyurethane emulsion to water can be 1:3-5.

[0026] In another aspect, the present application also provides a manufacturing method of the slope protection spraying material as described above, comprising the following steps:

[0027] 1) Soak the Dendrocalamus latiflorus aggregate in the preservative solution, then take it out and dry to obtain the corrosion-resistant Dendrocalamus latiflorus aggregate; soak the corrosion-resistant Dendrocalamus latiflorus aggregate in the water-based polyurethane solution, then take it out and dry to obtain the modified Dendrocalamus latiflorus aggregate;

[0028] 2) Mix cement, water, sand, modified Dendrocalamus latiflorus aggregate and pig hair fiber according to the mass ratio, then add the anionic polymer, and continue to mix to obtain the slope protection spraying material;

[0029] The pig hair fiber is the pig hair fiber after being boiled and drained. In this way, the compressive strength and splitting tensile strength of the spraying material after forming the bamboo aggregate concrete are relatively large, and the spraying protection layer is not prone to shrinkage cracking.

[0030] The present application finds that adding a certain amount of 20-30 mm long pig hair fiber treated by boiling can improve the tensile strength of the formed concrete and prevent the concrete from shrinking and cracking.

[0031] In the present application, the pig hair fibers with a length of 20-30 mm are boiled in water for 20-40 min, preferably 30-40 min, drained, boiled again for 5-20 min, preferably 10-15 min, and drained again to obtain the pig hair fibers. In this way, the oil attached to the pig hair fibers can be removed, and the adhesion of the pig hair fibers to the cement paste can be increased.

[0032] According to the manufacturing method of the present application, preferably, the bamboo aggregate is soaked in the preservative solution for 12-48 h; and the corrosion-resistant bamboo aggregate is soaked in the aqueous polyurethane solution for 20-24 h.

[0033] In another aspect, the present application also provides a use of pig hair fibers for improving the strength of the spray protection material for slope protection. In particular, the present application provides a use of pig hair fibers for improving the tensile strength of the spray protection material for slope protection. The present application surprisingly finds that the addition of a certain amount of pig hair fibers can significantly increase the splitting tensile strength of the bamboo aggregate concrete formed after the solidification of the spray protection material, and prevent the shrinkage cracking of the spray protection layer. The present application believes that the added pig hair fibers are like a plurality of “flexible steel bars” distributed in the concrete to form “multi-directional reinforcement”, and when the formed concrete deforms due to temperature shrinkage and dry shrinkage, the “flexible steel bars” make the concrete less likely to crack and less likely to have cracks.

[0034] The spray protection material for slope protection of the present application has a small self-weight, is easy to combine with the rock slope, is not easy to slide and fall, and the formed spray protection layer basically does not have the phenomenon of shrinkage cracking. In addition, the present application uses bamboo as the aggregate and adds pig hair fibers, so that the spray protection material for slope protection of the present application is more green and environmentally friendly, has good economic benefits and social benefits. The manufacturing method of the present application is more conducive to improving the compressive strength and splitting tensile strength of the obtained spray protection material. DETAILED DESCRIPTION

[0035] The present application will be further described below in conjunction with specific embodiments, but the scope of protection of the present application is not limited thereto.

[0036] In the following examples, the polyurethane emulsion used is water-based polyurethane resin dispersion type 303, purchased from Anhui Yuanchen New Material Technology Co., Ltd., and the mass concentration of the polyurethane emulsion is 16.7 wt%. The CCA preservative used is purchased from Sanyu Chemical Industry (Shenzhen) Co., Ltd. The anionic polymer is Wenlun glue, purchased from Nanjing Songguan Biological Technology Co., Ltd.

[0037] Examples 1 to 3 and Comparative Example 1

[0038] The bamboo with a growth age of 3-5 years is cut to prepare aggregate particles in the shape of a cube or a cube-like body or a wedge-shaped body, and the edge length of the particles is 5-10 mm.

[0039] The cut Dendrocalamus giganteus aggregate is soaked in a CCA wood preservative solution (the preservative is diluted with water; the dilution ratio of the preservative to water is 1:15) for 24 h, filtered, and then the filtered Dendrocalamus giganteus aggregate is dried at 105 DEG C for 1 h, and then dried at 75 DEG C until constant weight to obtain the rot-resistant Dendrocalamus giganteus aggregate.

[0040] The rot-resistant Dendrocalamus giganteus aggregate is soaked in an aqueous polyurethane solution (the polyurethane emulsion is diluted with water; the volume ratio of the polyurethane emulsion to water is 1:3) for 24 h, filtered, and then the filtered Dendrocalamus giganteus aggregate is dried at 95 DEG C for 1 h, and then dried at 65 DEG C until constant weight to obtain the modified Dendrocalamus giganteus aggregate.

[0041] The pig hair fiber segments with a length of 20-30 mm are boiled in water for 30 min, drained, boiled again for 10 min, and drained to obtain the treated pig hair fibers.

[0042] The cement, water, sand, modified Dendrocalamus giganteus aggregate, and treated pig hair fibers are mixed according to the formulation in Table 1, and warm rubber is added and mixed uniformly to obtain the slope protection spray protection material.

[0043] The obtained slope protection spray protection material is loaded into a 150 mm x 150 mm x 150 mm mold and vibrated to form a compact, demolded after curing at room temperature for 24 h, and after standard curing for 28 days, the 28-day compressive strength and splitting tensile strength of the formed pig hair fiber-Dendrocalamus giganteus aggregate concrete are tested according to the Standard Test Methods for Physical and Mechanical Properties of Concrete (GB / T 50081-2019). The results are shown in Table 2.

[0044] Table 1

[0045]

[0046] Table 2

[0047]

[0048] Thus, the compressive strength and splitting tensile strength of the obtained slope protection spray protection material are significantly improved after the steps of molding, curing, demolding, and curing.

[0049] The present application is not limited to the above-mentioned embodiments, and any modifications, improvements, and replacements that can be conceived by those skilled in the art without departing from the essential content of the present application fall within the scope of the present application.

Claims

1. A spray-on protective material for slope protection, characterized by is formed by components including cement, water, sand, modified areca fiber aggregate, pig hair fiber and anionic polymer substance; The mass ratio of the cement, water, sand, modified areca fiber aggregate and pig hair fiber is 1:0.4-0.6:1.01-1.43:0.5-0.75:0.003-0.005; The mass ratio of the anionic polymer substance and the cement is 0.003-0.005:

1. The modified areca fiber aggregate is obtained by immersing areca fiber aggregate in a preservative solution, drying, immersing again in a water-based polyurethane solution and drying. The pig hair fiber is boiled and drained.

2. The spray-on protective material for slope protection according to claim 1, wherein The mass ratio of the cement, water, sand, modified areca fiber aggregate and pig hair fiber is 1:0.4-0.5:1.01-1.43:0.5-0.7:0.003-0.

005.

3. The spray-on protective material for slope protection according to claim 1, wherein The anionic polymer substance is warm rubber.

4. The spray-on protective material for slope protection according to claim 1, wherein The areca fiber aggregate is in the shape of a cube or a wedge with a side length of 5-10mm; the pig hair fiber is 20-30mm long.

5. The slope protection spray-on material of claim 1, wherein The preservative solution is a CCA type preservative solution.

6. The slope protection spray-on protective material according to claim 1, wherein The water-based polyurethane solution is obtained by diluting polyurethane emulsion with water; The molecular weight of the polyurethane emulsion is greater than 5000. The mass concentration of the polyurethane emulsion is 10-25wt%.

7. The method for producing a slope protection spray protection material according to any one of claims 1 to 6, characterized by, The method comprises the following steps: 1) Immersing areca fiber aggregate in a preservative solution, taking out and drying to obtain preservative-resistant areca fiber aggregate; immersing the preservative-resistant areca fiber aggregate in a water-based polyurethane solution, taking out and drying to obtain modified areca fiber aggregate; 2) Mixing cement, water, sand, modified areca fiber aggregate and pig hair fiber according to the mass ratio, then adding anionic polymer substance and continuing to mix to obtain the slope protection spray protection material.

8. The production method according to claim 7, wherein The areca fiber aggregate is immersed in the preservative solution for 12-48h.

9. The production method according to claim 8, wherein The preservative-resistant areca fiber aggregate is immersed in the water-based polyurethane solution for 20-24h.

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