Flexible concrete blanket for ditch protection and preparation method thereof

Abstract

The present invention belongs to the field of building materials technology, specifically a flexible concrete blanket for ditch protection and a method for preparing the same. The flexible concrete blanket comprises a permeable fabric layer on top, a waterproof fabric layer on the bottom, and a cement solid-phase filler and flat fibers or fabric between the permeable and waterproof fabrics. The permeable and waterproof fabrics are connected by a plurality of spaced-apart stitching fibers. By adding flat fibers or fabric to the cement solid-phase filler, the present invention enables the stitching fibers to stitch the flat fibers or fabric together, strengthening the binding and fixation of the cement solid-phase filler while reducing stitching density, thereby increasing the flexibility of the concrete blanket. Furthermore, the flat fibers or fabric serve as a reinforcement to enhance 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] Roadside slopes, river embankments, and other structures often require reinforcement to prevent soil erosion and landslides. Slope protection primarily utilizes block stone, concrete, and metal mesh. Flexible concrete blanket, a new composite material combining fiber-reinforced materials with a concrete base, offers high tensile strength, excellent weather resistance, and excellent environmental performance, making it a preferred material for slope protection. Before curing, it is flexible and can be transported in rolls. It is then laid to the protected location and cured by sprinkling water, forming a concrete structure with sufficient support strength.

[0003] Flexible concrete blankets typically consist of a mesh structure consisting of a top layer, a bottom layer, and a connecting layer. The cavity between the bottom and top layers is filled with cement-based dry powder. After application, the cement blanket solidifies upon contact with water, forming a concrete-like structure. The composition and dispersibility of the cement-based dry powder directly impact the performance of the cured concrete blanket, necessitating the control of the cement-based dry powder's fixation between the fiber fabrics. Common filling techniques include vibration bonding, needle punching, and quilting. For example, patent CN117841479A discloses a reinforced composite cement blanket comprising, 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 non-woven geotextile layer is laid on top of the cement-based material and secured together through a needle punching process to form a single, integrated structure. Because the cement-based material layer primarily consists of inorganic powders, a high needling density is required to prevent the powder from shifting or leaking. This increases needling costs and reduces efficiency. Furthermore, excessive needling density can compromise the flexibility of the blanket.

[0004] Patent CN118145942A discloses a flexible ecological concrete slope protection blanket comprising a fiber-reinforced base fabric and a concrete substrate; the concrete substrate comprises cement, aggregate, a water-reducing agent, and a setting regulator comprising polyacrylamide microspheres, calcium polyacrylate microspheres, and octylphenol polyoxyethylene ether. The patent improves the strength of the concrete by optimizing the setting regulator. However, the method does not describe how to secure the concrete substrate, and the strength of the blanket remains 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 purpose 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 objectives, the present 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 a cement solid-phase filler and flat fibers or fabric between the permeable and waterproof fabrics; the permeable and waterproof fabrics are connected by a plurality of spaced-apart stitching fibers.

[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 stitching 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 provided at the bottom.

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

[0015] The material of the water-permeable fabric is polyamide, polypropylene or polyester, and the thickness is 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 to 1 mm.

[0018] In general, the above technical solutions conceived by the present invention have the following technical advantages compared with the existing technology:

[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 sutured and fixed under the action of the suture fibers, thereby strengthening the binding and fixing effect on the cement solid phase filler. At the same time, the suture 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 objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining 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 may be combined with each other as long as they do not conflict with each other.

[0024] The present 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 a cement solid-phase filler and flat fibers or fabric between the permeable fabric and the waterproof fabric; the permeable fabric and the waterproof fabric are connected by a plurality of spaced-apart stitching fibers.

[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 being displaced or even lost 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. 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 flat fiber or fabric has a cross-sectional size of (0.5-3 mm) x (0.1-1 mm), preferably a rectangular cross-section, and a length of 5-20 mm. The flat fiber or fabric has a larger contact surface with the suture fibers, making it easier to suture and secure, thereby enhancing the binding and reinforcement effects.

[0027] The added amount of the flat fiber or fabric is 1 to 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 fibers or fabrics and the stitching fibers are all water-absorbing materials. The water-absorbing materials include one or more of polyvinyl alcohol, polyamide, cellulose, and polyacrylic acid. The water-absorbing materials improve the water conductivity between the cement solid phase filler, thereby improving the uniformity of the solidification and ultimately increasing the solidification 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 at the bottom. The waterproof fabric is woven from polyethylene fibers, polypropylene fibers, or polyester fibers; the permeable fabric is made of 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 fibers is 0.1 to 1 mm. The present invention, by adding flat fibers or fabrics, enables the cement solid phase filler to be effectively fixed at a relatively low stitching density, thereby improving production efficiency and reducing costs while ensuring the flexibility of the concrete blanket.

[0032] Example 1

[0033] A flexible concrete blanket for ditch protection comprises a 1mm thick polyamide permeable fabric on the upper layer, a 10mm 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 spaced-apart stitching fibers.

[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 a filling density of 12kg / m 2 The addition amount of polyamide flat fiber is 5% of the mass of cement solid phase filler. The cross-sectional size of polyamide flat fiber is 2mm×0.5mm and the length of 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 is different from Example 1 in that the added amount of polyamide flat fiber is 1% of the mass of the cement solid phase filler.

[0037] Example 3

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

[0039] Example 4

[0040] A flexible concrete blanket for ditch protection, which differs 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 differs 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 differs 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 differs 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 polyamide flat fibers are not added.

[0053] 1) The flexible concrete blankets prepared in the examples and comparative examples were watered and cured before being subjected to strength and impact resistance tests. 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) The 100×100 mm flexible concrete blankets prepared in the Examples and Comparative Examples were vibrated on a circular vibrating screen for 5 minutes at a frequency of 20 Hz. 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) was measured, and the strength after vibration was tested according to the first test method.

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

[0056]

[0057] Table 1 shows that when flat fibers are used, the concrete blanket exhibits superior strength and is more resistant to vibration losses, making it less susceptible to performance degradation during packaging, transportation, and installation. When circular fibers are used, the unvibrated strength is slightly lower than that of the flat fibers, indicating that the flat fibers' anchoring effect contributes to the improved strength. After vibration treatment, the strength of the comparative example decreases significantly, indicating that the loss of cement solid filler contributes to the deterioration of strength.

[0058] Furthermore, the stitching fiber arrangement density of the present invention is 1 fiber / 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 unique role 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 scope of protection of the present invention.

Claims

1. A flexible concrete blanket for ditch protection, characterized in that: The invention comprises a water-permeable fabric on an upper layer, a waterproof fabric on a lower layer, and cement solid-phase fillers and flat fibers between the water-permeable fabric and the waterproof fabric; the water-permeable fabric and the waterproof fabric are connected by a plurality of spaced stitching fibers; the flat fibers are stitched and fixed by the stitching fibers; the cross-sectional dimensions of the flat fibers are 2 mm x 0.5 mm, and the length of the flat fibers is 5 to 20 mm; the flat fibers and the stitching fibers are both water-absorbing materials; the stitching fibers are arranged at a density of 1 to 5 fibers / cm 2 ; The added amount of the flat fibers is 1 to 8% of the mass of the cement solid phase filler.

2. 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.

3. The flexible concrete blanket for ditch protection according to claim 1, characterized in that: The water-absorbing material includes one or more of polyvinyl alcohol, polyamide, cellulose, and polyacrylic acid.

4. 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 on the bottom.

5. The flexible concrete blanket for ditch protection according to claim 4, characterized in that: The waterproof fabric is woven from polyethylene fibers, polypropylene fibers or polyester fibers; The material of the water-permeable fabric is polyamide, polypropylene or polyester, and the thickness is 1 to 2 mm.

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

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