Flexible concrete blanket for side ditch protection and preparation method thereof

Abstract

The invention belongs to the technical field of building materials, and particularly relates to a flexible concrete blanket for side ditch protection and a preparation method thereof.The flexible concrete blanket comprises a permeable fabric located on the upper layer, a waterproof fabric located on the lower layer, and a cement solid-phase filler and flat fibers or fabrics located between the permeable fabric and the waterproof fabric; the permeable fabric and the waterproof fabric are connected through a plurality of sewing fibers which are arranged at intervals. According to the invention, by adding the flat fiber or the fabric into the cement solid-phase filler, on one hand, the flat fiber or the fabric can be sewed and fixed under the action of the sewed fiber, the binding and fixing effects on the cement solid-phase filler are enhanced, and on the other hand, the sewed density can be reduced, so that the flexibility of the concrete blanket is improved; the flat fiber or fabric can be used as a reinforcing phase to improve the strength of the concrete blanket.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a flexible concrete blanket for ditch protection and a preparation method thereof. Background Art

[0002] Road slopes, river banks, etc. usually need to be reinforced to prevent soil erosion and landslides. Slope protection mainly uses block stones, concrete, metal mesh, etc. to protect the slope. Flexible concrete blanket is a new type of composite material, which is made of fiber-reinforced materials combined with concrete substrate. It has high tensile strength, good weather resistance and excellent environmental protection characteristics, making it the preferred material for slope protection. It is flexible before curing and can be transported in rolls. When used, it is laid to the protection position, and then sprinkled with water to cure, forming a concrete structure with a certain support strength.

[0003] Flexible concrete blankets usually include a mesh structure consisting of a top layer, a bottom layer and a connecting layer. The cavity between the bottom layer and the top layer is filled with cement-based dry powder. After the cement blanket is constructed, it solidifies when it encounters water to form a concrete-like structure. Among them, the composition and dispersibility of the cement-based dry powder directly affect the performance of the concrete blanket after solidification. Therefore, it is necessary to control the fixing process of the cement-based dry powder between the fiber fabrics. The commonly used filling processes are vibration bonding, needle punching and quilting. For example, patent CN117841479A discloses a reinforced composite cement blanket, including a reinforced non-woven geotextile layer, a cement-based material layer, a non-woven geotextile layer and a reinforced HPDE reinforced geomembrane arranged in sequence from top to bottom; a non-woven geotextile layer is laid on the cement-based material; and the non-woven geotextile layer is fixedly connected by a needle punching process to form a whole. Since the main raw materials of the cement-based material layer are all inorganic powder materials, a large needle punching density is required to ensure that the powder is not easily displaced or leaked, which increases the needle punching cost and reduces the efficiency. When the needle punching density is too large, the flexibility of the cement blanket will be affected.

[0004] Patent CN118145942A discloses a flexible ecological concrete slope protection blanket, which includes a fiber-reinforced base fabric and a concrete substrate; the concrete substrate includes cement, aggregate, water reducing agent, and setting agent, wherein the setting agent includes polyacrylamide microspheres, calcium polyacrylate microspheres, and octylphenol polyoxyethylene ether. The patent improves the strength of concrete by optimizing the setting agent. The method does not record how to fix the concrete substrate, and the strength still needs to be improved.

[0005] Therefore, it is necessary to provide an improved flexible concrete blanket for ditch protection and a preparation method thereof to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a flexible concrete blanket for ditch protection and a preparation method thereof, which improves the fixing effect of cement solid phase filler through flat fibers or fabrics, thereby improving durability and strength, while reducing costs and improving production efficiency.

[0007] To achieve the above-mentioned purpose, the present invention provides a flexible concrete blanket for ditch protection, comprising a permeable fabric located on an upper layer, a waterproof fabric located on a lower layer, and a cement solid phase filler and flat fibers or fabrics located between the permeable fabric and the waterproof fabric; the permeable fabric and the waterproof fabric are connected by a plurality of sutured fibers arranged at intervals.

[0008] Furthermore, the cross-sectional dimensions of the flat fiber or fabric are (0.5-3 mm)×(0.1-1 mm), and the length of the flat fiber is 5-20 mm.

[0009] Furthermore, the addition amount of the flat fiber or fabric is 1 to 8% of the mass of the cement solid phase filler.

[0010] Furthermore, the cement solid phase filler comprises cement and fine aggregate in a mass ratio of 1:(2-3), and the particle size of the fine aggregate is 0.5-1 mm.

[0011] Furthermore, the flat fibers or fabrics and the stitched fibers are all water-absorbing materials.

[0012] Furthermore, the water-absorbing material includes one or more of polyvinyl alcohol, polyamide, cellulose, and polyacrylic acid.

[0013] Furthermore, the waterproof fabric has a three-dimensional structure formed by twill weaving, has a thickness of 5-20 mm, and a polyvinyl chloride waterproof substrate is arranged at the bottom.

[0014] Furthermore, the waterproof fabric is woven from polyethylene fibers, polypropylene fibers or polyester fibers;

[0015] The water-permeable fabric is made of polyamide, polypropylene or polyester and has a thickness of 1 to 2 mm.

[0016] Furthermore, the arrangement density of the stitching fibers is 1 to 5 fibers / cm 2 .

[0017] Furthermore, the fineness of the suture fiber is 0.1-1 mm.

[0018] In general, the above technical solution conceived by the present invention has the following technical advantages compared with the prior art:

[0019] The present invention adds flat fibers or fabrics to the cement solid phase filler. On the one hand, the flat fibers or fabrics can be sewed and fixed under the action of the sew fibers, thereby strengthening the binding and fixing effect on the cement solid phase filler. At the same time, the sew density can be reduced, thereby improving the flexibility of the concrete blanket. On the other hand, the flat fibers or fabrics can serve as a reinforcing phase to improve the strength of the concrete blanket. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the flexible concrete blanket for ditch protection provided by the present invention.

[0021] Reference numerals:

[0022] 1-permeable fabric; 2-waterproof fabric; 3-stitched fiber; 4-cement solid phase filler; 5-flat fiber. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0024] The invention provides a flexible concrete blanket for ditch protection, comprising a permeable fabric on an upper layer, a waterproof fabric on a lower layer, and cement solid phase fillers and flat fibers or fabrics between the permeable fabric and the waterproof fabric; the permeable fabric and the waterproof fabric are connected by a plurality of sutured fibers arranged at intervals.

[0025] In this way, by adding flat fibers or fabrics to the cement solid phase filler, on the one hand, the flat fibers or fabrics can be sutured and fixed under the action of the suture fibers, thereby strengthening the binding and fixing effect on the cement solid phase filler, preventing the cement solid phase filler from displacement or even loss during transportation and laying, affecting the curing performance, and at the same time reducing the suture density, thereby improving the flexibility of the concrete blanket, and on the other hand, the flat fibers or fabrics can serve as a reinforcing phase to improve the strength of the concrete blanket.

[0026] The cross-sectional dimensions of the flat fiber or fabric are (0.5-3 mm)×(0.1-1 mm), and the cross-sectional dimensions are preferably rectangular. The length of the flat fiber is 5-20 mm. The flat fiber or fabric has a larger contact surface with the suture fiber, and is easier to be sutured and fixed, thereby improving the binding and strengthening effects.

[0027] The added amount of the flat fiber or fabric is 1-8% of the mass of the cement solid phase filler.

[0028] The cement solid phase filler comprises cement and fine aggregate in a mass ratio of 1:(2-3), and the particle size of the fine aggregate is 0.5-1 mm.

[0029] The flat fiber or fabric and the stitched fiber are all water-absorbing materials. The water-absorbing material includes one or more of polyvinyl alcohol, polyamide, cellulose, and polyacrylic acid. The water-absorbing material improves the water conductivity between the cement solid phase filler, thereby improving the uniformity of curing and ultimately improving the curing strength.

[0030] The waterproof fabric has a three-dimensional structure formed by twill weaving, with a thickness of 5-20 mm, and a polyvinyl chloride waterproof substrate is arranged at the bottom. The waterproof fabric is woven from polyethylene fiber, polypropylene fiber or polyester fiber; the material of the permeable fabric is polyamide, polypropylene or polyester, with a thickness of 1-2 mm.

[0031] The arrangement density of the stitching fibers is 1 to 5 fibers / cm 2 The fineness of the stitching fiber is 0.1-1 mm. The invention adds flat fibers or fabrics, so that the cement solid phase filler can be effectively fixed at a relatively low stitching density, which can improve the production efficiency and reduce the cost, and ensure the flexibility of the concrete blanket.

[0032] Example 1

[0033] A flexible concrete blanket for ditch protection comprises a 1 mm thick polyamide permeable fabric on the upper layer, a 10 mm thick three-dimensional polyester waterproof fabric on the lower layer, and cement solid phase fillers and polyamide flat fibers between the permeable fabric and the waterproof fabric; the permeable fabric and the waterproof fabric are connected by a plurality of sutured fibers arranged at intervals.

[0034] The cement solid phase filler is composed of cement and fine aggregate (particle size 0.5-1mm) with a mass ratio of 1:2.5, and the filling density is 12kg / m 2 The amount of polyamide flat fiber added is 5% of the mass of cement solid phase filler, the cross-sectional size of the polyamide flat fiber is 2mm×0.5mm, and the length of the flat fiber is 10mm. The stitching fiber is cotton fiber with a fineness of 0.5mm and an arrangement density of 4 fibers / cm 2 .

[0035] Example 2

[0036] A flexible concrete blanket for ditch protection, which differs from Example 1 in that the added amount of polyamide flat fibers is 1% of the mass of cement solid phase filler.

[0037] Example 3

[0038] A flexible concrete blanket for ditch protection, which is different from Example 1 in that the added amount of polyamide flat fibers is 8% of the mass of cement solid phase filler.

[0039] Example 4

[0040] A flexible concrete blanket for ditch protection, which is different from Example 1 in that the length of the polyamide flat fiber is 5 mm.

[0041] Example 5

[0042] A flexible concrete blanket for ditch protection, which is different from Example 1 in that the length of the polyamide flat fiber is 20 mm.

[0043] Example 6

[0044] A flexible concrete blanket for ditch protection, which is different from Example 1 in that the cross-sectional size of the polyamide flat fiber is 1 mm×0.5 mm.

[0045] Example 7

[0046] A flexible concrete blanket for ditch protection, which differs from Example 1 in that the arrangement density of the stitching fibers is 1 fiber / cm 2 .

[0047] Example 8

[0048] A flexible concrete blanket for ditch protection, which differs from Example 1 in that the arrangement density of the stitching fibers is 8 fibers / cm 2 .

[0049] Comparative Example 1

[0050] A flexible concrete blanket for ditch protection, which is different from Example 1 in that the polyamide flat fiber is a circular cross-section polyamide fiber with a diameter of 1 mm.

[0051] Comparative Example 2

[0052] A flexible concrete blanket for ditch protection, which differs from Example 1 in that no polyamide flat fiber is added.

[0053] 1) After the flexible concrete blankets prepared in the examples and comparative examples were cured by watering, the strength and impact resistance were tested. The watering rate was 1 kg / m 2 . Strength reference "GB / T50081-2019 Standard for Test Methods of Mechanical Properties of Ordinary Concrete"

[0054] 2) Take the 100×100 mm flexible concrete blanket prepared in the embodiment and the comparative example, vibrate it on a circular vibrating screen for 5 minutes at a vibration frequency of 20 Hz, test the weight loss rate before and after vibration (i.e., the ratio of the mass difference before and after vibration to the mass before vibration), and test the strength after vibration according to the first test method.

[0055] Table 1 Performance test results of Examples 1-8 and Comparative Examples 1-2

[0056]

[0057] As can be seen from Table 1, when flat fibers are used, the concrete blanket has better strength and stronger ability to resist vibration loss. In practical applications, it is not easy to lose performance due to packaging, transportation and laying. When circular cross-section fibers are used, the strength without vibration treatment is slightly lower than that of flat fibers, indicating that the fixing effect of flat fibers helps to improve the strength. After vibration treatment, the comparison ratio decreases significantly, indicating that the loss of cement solid phase filler leads to poor strength.

[0058] Furthermore, the stitching fiber arrangement density of the present invention is 1 strand / cm 2 , and also has relatively high strength. After vibration treatment, the loss is also lower than that of comparative example 1, indicating that the present invention can achieve multiple beneficial effects through the special effects of flat fibers.

[0059] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible concrete blanket for ditch protection, characterized in that: It comprises a water-permeable fabric on the upper layer, a waterproof fabric on the lower layer, and cement solid phase filler and flat fiber or fabric between the water-permeable fabric and the waterproof fabric; the water-permeable fabric and the waterproof fabric are connected by a plurality of stitching fibers arranged at intervals.

2. The flexible concrete blanket for ditch protection according to claim 1, characterized in that: The cross-sectional dimensions of the flat fiber or fabric are (0.5-3 mm)×(0.1-1 mm), and the length of the flat fiber is 5-20 mm.

3. The flexible concrete blanket for ditch protection according to claim 1 is characterized in that: The added amount of the flat fiber or fabric is 1-8% of the mass of the cement solid phase filler.

4. The flexible concrete blanket for ditch protection according to claim 1, characterized in that: The cement solid phase filler comprises cement and fine aggregate in a mass ratio of 1:(2-3), and the particle size of the fine aggregate is 0.5-1 mm.

5. The flexible concrete blanket for ditch protection according to claim 2, characterized in that: The flat fibers or fabrics and the stitching fibers are water-absorbing materials.

6. The flexible concrete blanket for ditch protection according to claim 5, characterized in that: The water-absorbing material includes one or more of polyvinyl alcohol, polyamide, cellulose, and polyacrylic acid.

7. The flexible concrete blanket for ditch protection according to claim 1, characterized in that: The waterproof fabric has a three-dimensional structure formed by twill weaving, has a thickness of 5-20 mm, and a polyvinyl chloride waterproof substrate is arranged at the bottom.

8. The flexible concrete blanket for ditch protection according to claim 5, characterized in that: The waterproof fabric is woven from polyethylene fibers, polypropylene fibers or polyester fibers; The water-permeable fabric is made of polyamide, polypropylene or polyester and has a thickness of 1 to 2 mm.

9. The flexible concrete blanket for ditch protection according to claim 1, characterized in that: The arrangement density of the stitching fibers is 1 to 5 fibers / cm 2 .

10. The flexible concrete blanket for ditch protection according to claim 9, characterized in that: The fineness of the stitching fiber is 0.1-1 mm.

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