Reinforced composite cement blanket

Abstract

The application provides a reinforced composite cement blanket, and belongs to the technical field of cement products.The reinforced composite cement blanket comprises, from top to bottom, a reinforced non-woven geotextile layer, a cement-based material layer, a non-woven geotextile layer and a reinforced HPDE reinforced geomembrane.The application is provided with a reinforced HPDE reinforced geomembrane, which combines the advantages of the cement-based material and the high-density polyethylene waterproof coiled material, can combine the structural integrity of the cement and the waterproof property of the high-density polyethylene together, and forms a solid and reliable anti-seepage barrier.The combination of the two materials enhances the overall anti-seepage capacity of the system and prolongs the service life of the structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cement products, in particular to a reinforced composite cement blanket. BACKGROUND

[0002] With the development of social economy, the construction engineering and civil engineering industry has developed rapidly, and the quality requirements for construction are getting higher and higher. The construction field has expanded to places with relatively poor construction conditions, such as trenches, revetments, and mine areas in high-risk and complex areas. When using existing building composite materials such as concrete and mortar flagstone, temporary mixing and stirring are required, and manual stirring of the mixed materials is uneven, which produces a large amount of dust, increases the labor intensity of workers, and also pollutes the environment. In view of the above problems, cement blanket is currently used as a construction material.

[0003] Cement blanket, also known as concrete canvas, is a soft cloth impregnated with cement that will harden into a thin, waterproof and fireproof durable concrete layer when it comes into contact with water. However, the existing products have poor impermeability during the molding process, and inevitably have the disadvantages of low filling and compactness, and pores caused by hardening shrinkage, which makes the product itself have poor impermeability. The existing solution is to add PVC waterproof board and other materials at the bottom of the product, but the connection of PVC materials increases the construction steps and construction difficulty, and reduces the construction efficiency. SUMMARY

[0004] The main purpose of the present application is to provide a reinforced composite cement blanket to solve the problem of poor impermeability of the cement blanket in the background art.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A reinforced composite cement blanket comprises, from top to bottom, a reinforced non-woven geotextile layer, a cement-based material layer, a non-woven geotextile layer, and a reinforced HPDE reinforced geomembrane.

[0007] Preferably, the reinforced non-woven geotextile layer is a woven geotextile or a laminated body of woven cloth and non-woven cloth, and the grammage is 310-370 g / m 2 .

[0008] Preferably, the grammage of the non-woven geotextile layer is 190-210 g / m 2 .

[0009] Preferably, the preparation method of the cement-based material layer is as follows: 50-100 parts by weight of cement, 20-30 parts by weight of granulated blast furnace slag, 60-80 parts by weight of fly ash, 10-20 parts by weight of silica fume powder, 2-3 parts by weight of water reducing agent, and 1-5 parts by weight of reinforcing fiber are uniformly mixed.

[0010] Further preferably, the preparation method of the reinforcing fiber is as follows:

[0011] 1) After the waste tire rubber is finely ground and sieved, it is immersed in ethyl acetate, and the solid is collected by filtration to obtain pretreated rubber powder;

[0012] 2) The pretreated rubber is mixed with an aqueous sodium bicarbonate solution, heated, and then diethylene triamine is added for reaction, followed by the addition of gamma-glycidoxypropyltrimethoxysilane for further reaction, and the functionalized rubber powder is obtained after treatment;

[0013] 3) Basalt fibers are added to dilute hydrochloric acid and stirred, then fatty acid glycerides are added, heated and reacted, then the functionalized rubber powder obtained in step 2) and polyethylene glycol are added for further reaction, and the reinforcing fiber is obtained after treatment.

[0014] The cement-based material layer in the prior art inevitably has the disadvantages of low filling density, pore formation due to hardening shrinkage, etc., which makes the product itself have poor anti-seepage performance, and the inventors can improve the adaptability of the fiber to the cement system by further treating the fiber, the functionalized rubber powder can well fill the pores in the slurry, and the density of the cement-based material is improved, thereby improving the anti-seepage performance.

[0015] Preferably, the reinforced HPDE geomembrane is fixed with a non-woven geotextile layer through an adhesive coating layer; the thickness is 0.54-0.66 mm; the unit weight is 306-374 g / m 2 ; the tensile strength is ≥28 kN / m; the puncture resistance is ≥700 N; and the permeability coefficient is 1x10 -14 cm / sec.

[0016] Preferably, the adhesive coating layer is a hot melt pressure sensitive adhesive fusion solidification layer, and the melt viscosity is 3850-5850 mPa·s.

[0017] The application also provides a preparation process of the reinforced composite cement blanket, which comprises the following steps:

[0018] S1 lays a reinforced non-woven geotextile, then lays a cement-based material on the reinforced non-woven geotextile layer, and flattens it with a scraper;

[0019] S2 lays a non-woven geotextile layer on the cement-based material in step S1, and fixes and connects them to form a whole through a needle punching process;

[0020] S3 applies an adhesive coating layer on the surface of the non-woven geotextile in step S2, and lays and bonds a reinforced HDPE reinforced geomembrane.

[0021] Preferably, the thickness of the cement-based material is 14-20 mm.

[0022] Preferably, the needling process in the S2 step is as follows: a cycle is formed from top to bottom in horizontal direction, during the downward movement of the needle, the barbs on the needle bar take the non-woven fabric on the cover cloth downward, pass through the reinforced non-woven geotextile layer and the cement-based material layer, and then pierce into the non-woven geotextile, the reinforcing fibers carried by the barbs are crosslinked with the non-woven geotextile, and the fibers carried by the barbs are left in the cement-based material when the needle is pulled upward.

[0023] The space formed by the needling process of the reinforced non-woven geotextile layer, the cement-based material layer and the non-woven geotextile is similar to a three-dimensional spacer fabric, the reinforcing fibers not only interweave all the materials in horizontal and vertical directions to form a planar structure, but also reinforce the cement-based material; the reinforced composite cement carpet adopts a one-step forming process and becomes a stable three-dimensional whole through the needle punching machine.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1. The reinforced composite cement carpet provided by the present application is a three-dimensional structure composite material composed of a reinforced non-woven geotextile layer, a cement-based material layer, a non-woven geotextile layer, a glue coating layer and a reinforced HPDE geotechnical membrane, which is hardened after encountering water, has excellent properties such as waterproofness, fire resistance, erosion resistance and crack resistance, is easy to construct, and can effectively prevent water and soil loss and play a reinforcing and reinforcing role.

[0026] 2. The present application provides a layer of reinforced HPDE geotechnical membrane, which combines the advantages of cement-based materials and high-density polyethylene waterproof coiled material, integrates the structural integrity of cement and the waterproof properties of high-density polyethylene, and forms a solid and reliable anti-seepage barrier; the combination of the two materials enhances the overall anti-seepage capacity of the system and prolongs the service life of the structure.

[0027] 3. By treating the reinforcing fibers in the cement-based material layer, the adaptability of the fibers to the cement system can be improved, and the functionalized rubber powder can be well filled in the pores inside the slurry, improving the compactness of the cement-based material and further improving the impermeability of the material. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in conjunction with the drawings and examples:

[0029] Figure 1 is a diagram of the movement of the needle of the present application;

[0030] Figure 2 is a front view of the reinforced composite cement carpet of the present application. DETAILED DESCRIPTION

[0031] Example 1

[0032] A preparation process of reinforced composite cement blanket, comprising the following steps:

[0033] S1 laying reinforced non-woven geotextile, then laying cement-based material on the reinforced non-woven geotextile layer, and leveling with a scraper; the reinforced non-woven geotextile layer is a superimposed body of woven geotextile and non-woven fabric, with a grammage of 350g / m 2 ; the laying thickness of the cement-based material is 15mm;

[0034] S2 laying a non-woven geotextile layer on the cement-based material in S1 step, and fixedly connecting to form an integral body through a needle punching process; the non-woven geotextile layer has a grammage of 200g / m 2 ;

[0035] S3 melting hot melt pressure sensitive adhesive and coating on the surface of the non-woven geotextile in S2 step, then laying reinforced HDPE reinforced geomembrane for bonding; the reinforced HPDE reinforced geomembrane has a thickness of 0.5mm, a unit weight of 320g / m 2 , a tensile strength of 30kN / m, a puncture resistance of 800N, and a permeability coefficient of 1x10 -14 cm / sec; the hot melt pressure sensitive adhesive has a melting viscosity of 4000mPa·s; and the front view of the reinforced composite cement blanket is shown in Figure 2 .

[0036] The needle punching process in S2 step is as follows: the movement mode of the needle is shown in Figure 1 , and a cycle is formed from top to bottom in horizontal direction; in the process of downward movement of the needle, the barbs on the needle bar carry the non-woven fibers on the cover cloth downward, penetrate through the reinforced non-woven geotextile layer and the cement-based material layer, and then pierce into the non-woven geotextile; the reinforced fibers carried by the barbs are crosslinked with the non-woven geotextile; and the fibers carried by the barbs are left in the cement-based material when the needle is pulled upward.

[0037] The preparation method of the cement-based material is as follows: uniformly mixing 500g cement, 200g granulated blast furnace slag, 600g fly ash, 100g silica ash powder, 20g polycarboxylic acid water reducer, and 10g reinforced fibers.

[0038] The preparation method of the reinforced fibers is as follows:

[0039] 1) grinding the waste tire rubber through a 40-mesh sieve, then immersing in ethyl acetate for 10h, collecting the solid by filtration, and drying at 60℃ for 4h to obtain pretreated rubber powder;

[0040] 2) 100 g of pretreated rubber was mixed with 600 mL of sodium bicarbonate aqueous solution and heated to 60 °C, 23.6 g of diethylene triamine was added and reacted for 2 h, then 10.8 g of γ-glycidoxypropyltrimethoxysilane was added and reacted for 1 h, after the reaction was completed, filtration was performed, the solid was washed with water and dried to obtain functionalized rubber powder;

[0041] 3) 50 g of basalt fiber was added to 200 mL of 10 wt% dilute hydrochloric acid and stirred to mix uniformly, then 30 mL of fatty acid glyceride was added, heated to 80 °C and reacted for 1 h, then 25 g of functionalized rubber powder obtained in step 2) was added and stirred to react for 2 h; after cooling, 80 mL of polyethylene glycol was added and stirred for 30 min, filtration was performed, the solid was collected, washed with water and dried to obtain the reinforcing fiber.

[0042] Example 2

[0043] A preparation process of a reinforced composite cement blanket, comprising the following steps:

[0044] S1 laying a reinforced non-woven geotextile, then laying a cement-based material on the reinforced non-woven geotextile layer and flattening with a scraper; the reinforced non-woven geotextile layer is a superimposed body of woven geotextile and non-woven fabric, and the grammage is 350 g / m 2 ; the laying thickness of the cement-based material is 15 mm;

[0045] S2 laying a non-woven geotextile layer on the cement-based material in step S1, and fixedly connecting to form a whole through a needle punching process; the grammage of the non-woven geotextile layer is 200 g / m 2 ;

[0046] S3 melting hot melt pressure sensitive adhesive and coating on the surface of the non-woven geotextile in step S2, then laying a reinforced HDPE reinforced geomembrane for adhesion; the thickness of the reinforced HPDE reinforced geomembrane is 0.5 mm; the unit weight is 320 g / m 2 ; the tensile strength is 30 kN / m; the puncture resistance is 800 N; the permeability coefficient is 1 x 10 -14 cm / sec; the melting viscosity of the hot melt pressure sensitive adhesive is 4000 mPa·s; the front view of the reinforced composite cement blanket is shown in Figure 2 .

[0047] The needle punching process in step S2 is as follows: the movement mode of the needle is as shown in Figure 1 , forming a cycle from top to bottom in the horizontal direction, in the process of downward movement of the needle, the barbs on the needle bar carry the non-woven fibers on the cover cloth downward, pass through the reinforced non-woven geotextile layer and the cement-based material layer, and then pierce into the non-woven geotextile, the reinforcing fibers carried by the barbs are crosslinked with the non-woven geotextile, and the fibers carried by the barbs are left in the cement-based material when the needle is pulled upward.

[0048] The preparation method of the cement-based material is to mix 500 g of cement, 200 g of granulated blast furnace slag, 600 g of fly ash, 100 g of silica ash powder, 20 g of polycarboxylate superplasticizer, and 10 g of reinforcing fiber uniformly.

[0049] The preparation method of the reinforcing fiber is as follows:

[0050] 50 g of basalt fiber is added to 200 mL of 10 wt% dilute hydrochloric acid and stirred to mix uniformly, then 30 mL of fatty acid glyceride is added, heated to 80°C for 1 h of reaction, after cooling, 80 mL of polyethylene glycol is added and stirred for 30 min, filtered, and the solid is collected, washed with water and dried to obtain the reinforcing fiber.

[0051] Example 3

[0052] A preparation process of a reinforced composite cement blanket, comprising the following steps:

[0053] S1: laying a reinforced non-woven geotextile, then laying a cement-based material on the reinforced non-woven geotextile layer and flattening with a scraper; the reinforced non-woven geotextile layer is a superimposed body of woven geotextile and non-woven fabric, with a grammage of 350 g / m 2 ; the laying thickness of the cement-based material is 15 mm;

[0054] S2: laying a non-woven geotextile layer on the cement-based material in step S1, and fixedly connecting to form a whole through a needle punching process; the non-woven geotextile layer has a grammage of 200 g / m 2 ;

[0055] S3: melting hot melt pressure sensitive adhesive and coating it on the surface of the non-woven geotextile in step S2, then laying a reinforced HDPE reinforced geomembrane for adhesion; the reinforced HPDE reinforced geomembrane has a thickness of 0.5 mm, a unit weight of 320 g / m 2 , a tensile strength of 30 kN / m, a puncture resistance of 800 N, and a permeability coefficient of 1 x 10 -14 cm / sec; the hot melt pressure sensitive adhesive has a melt viscosity of 4000 mPa·s; the front view of the reinforced composite cement blanket is shown in Figure 2 .

[0056] The needle punching process in step S2 is as follows: the movement mode of the needle is shown in Figure 1 , forming a cycle from top to bottom in the horizontal direction, in the process of downward movement, the barbs on the needle bar carry the non-woven fibers on the cover cloth downward, pass through the reinforced non-woven geotextile layer and the cement-based material layer, and then pierce into the non-woven geotextile, the reinforcing fibers carried by the barbs are crosslinked with the non-woven geotextile, and the fibers carried by the barbs remain in the cement-based material when the needle is pulled upward.

[0057] The preparation method of the cement-based material is to uniformly mix 500g of cement, 200g of granulated blast furnace slag, 600g of fly ash, 100g of silica fume powder, 20g of polycarboxylate superplasticizer and 10g of basalt fiber.

[0058] Embodiment 4

[0059] A preparation process of a reinforced composite cement blanket, comprising the following steps:

[0060] S1 lays a reinforced non-woven geotextile, then lays a cement-based material on the reinforced non-woven geotextile layer and flattens it with a scraper; the reinforced non-woven geotextile layer is a superimposed body of woven geotextile and non-woven fabric, and the grammage is 350g / m 2 ; the laying thickness of the cement-based material is 15mm;

[0061] S2 lays a non-woven geotextile layer on the cement-based material in S1, and fixes and connects to form an integral whole through a needle punching process; the grammage of the non-woven geotextile layer is 200g / m 2 ;

[0062] S3 melts hot melt pressure sensitive adhesive and coats it on the surface of the non-woven geotextile in S2, and then lays and bonds a reinforced HDPE reinforced geomembrane; the thickness of the reinforced HPDE reinforced geomembrane is 0.5mm; the unit weight is 320g / m 2 ; the tensile strength is 30kN / m; the puncture resistance is 800N; the permeability coefficient is 1x10 -14 cm / sec; the melting viscosity of the hot melt pressure sensitive adhesive is 4000mPa·s; and the front view of the reinforced composite cement blanket is as shown in Figure 2 .

[0063] The needle punching process in S2 is as follows: the movement mode of the needle is as shown in Figure 1 , and a cycle is formed from top to bottom in the horizontal direction; in the process of downward movement of the needle, the barbs on the needle bar take the non-woven fibers on the cover cloth downward, pass through the reinforced non-woven geotextile layer and the cement-based material layer, and then pierce into the non-woven geotextile; the reinforcing fibers carried by the barbs are crosslinked with the non-woven geotextile; and the fibers carried by the barbs are left in the cement-based material when the needle is pulled upward.

[0064] The preparation method of the cement-based material is to uniformly mix 500g of cement, 200g of granulated blast furnace slag, 600g of fly ash, 100g of silica fume powder, 20g of polycarboxylate superplasticizer and 10g of basalt fiber.

[0065] Anti-permeability test: the cement-based materials obtained in Examples 1-4 were first prepared into concrete according to a water-binder ratio of 0.28, the slurry was tested for various performance indicators and was molded, and was cured under standard conditions for 28 days; the test mold specifications were 40mm x 40mm x 160mm; the anti-permeability was tested according to the step-by-step pressure method described in GB / T50082-2009 "Standard for Testing Methods for Long-Term Performance and Durability of Ordinary Concrete", and the maximum water pressure was obtained, and the results are shown in Table 1:

[0066] Table 1 Anti-permeability test results

[0067]

[0068] As can be seen from the experimental data in Table 1, the cement-based material obtained in Example 1 has the best anti-permeability, and the possible reason is that the reinforcing fibers in Example 1 have good adaptability with the cement system, and the functionalized rubber powder can well fill the pores inside the slurry, improve the compactness of the cement-based material, and thus improve the anti-permeability thereof.

[0069] The above examples are only preferred technical solutions of the present application, and should not be regarded as a limitation of the present application, and the protection scope of the present application should be based on the technical solutions recited in the claims, including equivalent replacement solutions of the technical features recited in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A reinforced composite cementitious blanket, characterized by: The reinforced non-woven geotextile layer is a woven geotextile or a laminated body of woven cloth and non-woven cloth. The preparation method of the cement-based material layer is as follows: 50-100 parts of cement, 20-30 parts of granulated blast furnace slag, 60-80 parts of fly ash, 10-20 parts of silica ash powder, 2-3 parts of water reducing agent, and 1-5 parts of reinforcing fibers are uniformly mixed by weight parts. The preparation method of the reinforcing fiber is as follows: 1) After the waste tire rubber is finely ground and sieved, it is immersed in ethyl acetate, and the solid is collected by filtration to obtain pretreated rubber powder; 2) The pretreated rubber is mixed with sodium bicarbonate aqueous solution and heated, then diethylene triamine is added for reaction, and then γ-glycidoxypropyltrimethoxysilane is added for further reaction, and the functionalized rubber powder is obtained after treatment; 3) Basalt fiber is added to dilute hydrochloric acid and stirred, then fatty acid glyceride is added, heated and reacted, then the functionalized rubber powder obtained in step 2) and polyethylene glycol are added for further reaction, and the reinforcing fiber is obtained after treatment.

2. The reinforced composite cementitious mat of claim 1, wherein: The reinforced nonwoven geotextile layer has a grammage of 310 to 370 g / m 2 .

3. The reinforced composite cementitious mat of claim 1, wherein: The nonwoven geotextile layer has a weight of 190 to 210 g / m 2 .

4. The reinforced composite cementitious mat of claim 1, wherein: The reinforced HPDE geotextile is fixed with non-woven geotextile layer through adhesive coating, and has thickness of 0.54-0.66mm, unit weight of 306-374g / m 2 , tensile strength of ≥28kN / m, puncture resistance of ≥700N and permeability coefficient of 1×10 -14 cm / sec.

5. The reinforced composite cementitious mat of claim 4, wherein: The adhesive coating is a hot melt pressure sensitive adhesive fusion solidification layer.

6. The reinforced composite cementitious mat of claim 5, wherein: The hot melt pressure sensitive adhesive fusion viscosity is 3850-5850 mPa·s.

7. A method of manufacturing the reinforced composite cement mat according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1 lays the reinforced non-woven geotextile, then lays the cement-based material on the reinforced non-woven geotextile layer, and flattens it with a scraper; S2 lays the non-woven geotextile layer on the cement-based material in step S1, and fixes and connects it into a whole through a needling process; S3 applies an adhesive coating on the surface of the non-woven geotextile in step S2, and lays the reinforced HDPE geotextile membrane to bond.

8. The method of claim 7 wherein the step of forming the first and second layers comprises the step of: The needling process in step S2 is as follows: ​ In the horizontal direction, from top to bottom, a cycle is formed, and in the process of downward movement of the needle, the barbs on the needle bar carry the non-woven fibers on the cover cloth downward, pass through the reinforced non-woven geotextile layer and the cement-based material layer, and then pierce into the non-woven geotextile, the reinforcing fibers carried by the barbs are crosslinked with the non-woven geotextile, and when the needle is pulled out upward, the fibers carried by the barbs are left in the cement-based material layer.

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