Chopped glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material interlayer composite wallboard and preparation method thereof

Abstract

The invention discloses a chopped glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material interlayer composite wallboard and a preparation method thereof, and belongs to the technical field of building wallboards. The wallboard comprises two surface layers, a sandwich layer fixed between the two surface layers, and a connecting piece for connecting the two surface layers and the sandwich layer, the sandwich layer comprises honeycomb-shaped glass fiber three-dimensional fabric and 8-shaped glass fiber three-dimensional fabric which are stacked in sequence, and filler; and the surface layer and the filler are made of chopped fiber modified alkali-activated foam concrete. According to the wallboard, the combined three-dimensional fabric and the honeycomb-shaped glass fiber three-dimensional fabric are adopted to provide effective supporting and permeating effects, and the 8-shaped glass fiber three-dimensional fabric meets the requirements for bearing capacity and durability while reducing the weight of the wallboard; various mechanical properties, durability and high temperature resistance of the product are improved by adopting the chopped fiber reinforced alkali-activated foam concrete, and the production cycle and construction cost of the product are reduced by adopting the connecting piece for reinforcement.

Description

Technical Field

[0001] The invention belongs to the technical field of building wall panels, and in particular relates to a short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wall panel and a preparation method thereof. Background Art

[0002] Whether used as a load-bearing structure or a non-load-bearing structure, concrete wall panels need to meet the basic requirements of being strong, durable, fireproof, waterproof, and environmentally friendly. At the same time, in order to meet the requirements of thermal insulation of building walls, composite materials such as foam concrete and glass fiber related products can be considered for building wall panel materials.

[0003] Foamed concrete usually refers to a lightweight material containing a large number of closed pores formed by mechanically foaming the foaming agent and foaming materials through the foaming system of the foaming machine, and mixing the foam with the cementitious material and other materials in a certain proportion, and then pouring and naturally curing. Adding multi-component chopped fibers can improve the toughness and strength of the product. Give full play to the performance of different fibers themselves to improve the various mechanical properties, durability and high temperature resistance of foamed concrete. Although ordinary foamed concrete has the advantages of light weight, good impact resistance, environmental protection and economy, its shrinkage is much greater than that of ordinary concrete due to its high porosity and lack of coarse aggregate. Large shrinkage can easily lead to "collapse" after the foamed concrete is poured, and it can also easily lead to the formation of microcracks inside the foamed concrete, which can lead to problems such as cracking and low strength of the material.

[0004] In the prior art, a Chinese patent discloses a lightweight composite wall panel based on fabric and GFRP three-dimensional grid reinforcement (publication number CN213897664U), including two surface layers and a foam concrete sandwich layer filled between the two surface layers, and also includes a connector for connecting the two surface layers and the sandwich layer, the connector includes a plurality of GFRP bars and a plurality of GFRP hoops, the GFRP bars are symmetrically arranged in the two surface layers, and the GFRP hoops penetrate the foam concrete sandwich layer and are fixedly connected to the GFRP bars in the two surface layers to form a three-dimensional grid. The lightweight composite wall panel can not only improve the strength of the foam concrete in the sandwich layer by setting a three-dimensional grid-shaped connector, but also reduce the shrinkage strain of the foam concrete, increase the connection strength between the surface layer and the sandwich layer, and improve the overall bearing capacity of the sandwich layer material, thereby improving the overall shear strength of the composite wall panel. However, the realization of the effect of the lightweight composite wall panel only relies on the improvement of the connector, and there is no substantial improvement on the sandwich layer, so the effect is poor and needs to be further improved. Summary of the invention

[0005] The purpose of the present invention is to address the shortcomings of the prior art and provide a short-glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wall panel and a preparation method thereof. The short-glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wall panel is lightweight, high-strength, heat-insulating, environmentally friendly, durable, and high-temperature resistant.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are as follows.

[0007] The present invention provides a short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard, comprising two surface layers, a sandwich layer fixed between the two surface layers, and a connecting piece for connecting the two surface layers and the sandwich layer;

[0008] The sandwich layer includes a glass fiber three-dimensional fabric and a filler filled in the glass fiber three-dimensional fabric, and the glass fiber three-dimensional fabric is composed of a honeycomb glass fiber three-dimensional fabric and an 8-shaped glass fiber three-dimensional fabric stacked in sequence;

[0009] The materials of the surface layer and the filler are both chopped fiber modified alkali-activated foam concrete, and the chopped fibers include glass fibers.

[0010] Preferably, the two surfaces of the sandwich layer are fixed to the two surface layers respectively through a first adhesive layer, the thickness of the first adhesive layer is 2-5 mm, and the material is epoxy resin adhesive.

[0011] Preferably, the total thickness of the sandwich layer is 45-50 mm, the thickness of the honeycomb glass fiber three-dimensional fabric and the 8-shaped glass fiber three-dimensional fabric are 20-30 mm respectively, and the honeycomb glass fiber three-dimensional fabric is 0-8 mm thinner than the 8-shaped glass fiber three-dimensional fabric;

[0012] More preferably, the thickness of the honeycomb glass fiber three-dimensional fabric and the figure-8 glass fiber three-dimensional fabric is 22.5-25 mm respectively.

[0013] Preferably, the upper and lower surfaces of each honeycomb unit of the honeycomb glass fiber three-dimensional fabric are regular hexagons, and the six sides are X-shaped glass fiber fabrics, the two end points on the left side of each X-shaped glass fiber fabric are respectively connected to the two end points on the right side of the adjacent X-shaped glass fiber fabric on the left, and the two end points on the right side of each X-shaped glass fiber fabric are respectively connected to the two end points on the left side of the adjacent X-shaped glass fiber fabric on the right;

[0014] More preferably, the side length of the regular hexagon is 3-5 mm;

[0015] More preferably, the honeycomb glass fiber three-dimensional fabric is pre-shaped by using polyurethane resin.

[0016] Preferably, the 8-shaped glass fiber three-dimensional fabric is composed of two layers of glass fiber cloth and a plurality of evenly distributed core column yarns fixedly connecting the two layers of glass fiber cloth, the glass fiber cloth is woven from warp yarns and weft yarns, and the core column yarns are in the shape of an 8 along the weft direction and in the shape of a 1 along the warp direction;

[0017] More preferably, the distance between two adjacent core yarns is 0.5-1.5 mm;

[0018] More preferably, the 8-shaped glass fiber three-dimensional fabric is pre-shaped by using polyurethane resin.

[0019] Preferably, the connecting member comprises a plurality of GFRP bars and a plurality of GFRP hoops, wherein the plurality of GFRP bars are arranged in the two surface layers in the transverse direction, and the GFRP hoops are sleeved outside the GFRP bars in the two surface layers and fixedly connected to the GFRP bars at right angles to each other. When viewed from the side, the GFRP hoops are in a quadrilateral shape, and the glass fiber three-dimensional fabric is sleeved inside.

[0020] Preferably, the raw materials of the chopped fiber modified alkali-activated foam concrete include: foam and mortar;

[0021] The volume of the foam accounts for 25%-30% of the total volume of the chopped fiber modified alkali-activated foam concrete, the bubble size of the foam is 0.5-1.0 mm, and the density of the foam is 80-100 kg / m 3 ;

[0022] The mortar is composed of 1wt%-3wt% sodium hydroxide, 6wt%-9wt% water glass, 50wt%-55wt% sand, 12wt%-16wt% slag, 6wt%-9wt% fly ash, 6wt%-20wt% chopped fibers and 5wt%-19wt% water;

[0023] The chopped fibers further include at least one of basalt fibers, ceramic fibers and carbon fibers, wherein the addition amount of basalt fibers accounts for 3wt%-5wt% of the mortar, the addition amount of glass fibers accounts for 3wt%-5wt% of the mortar, the addition amount of ceramic fibers accounts for 3wt%-5wt% of the mortar, and the addition amount of carbon fibers accounts for 3wt%-5wt% of the mortar;

[0024] The bulk density of the chopped fiber reinforced alkali activated foam concrete is 120-130 kg / m 3 .

[0025] Preferably, it further comprises an inner panel and an outer panel respectively bonded and fixed to the outside of the two surface layers, wherein the inner panel is close to the 8-shaped glass fiber three-dimensional fabric, and the outer panel is close to the honeycomb glass fiber three-dimensional fabric.

[0026] More preferably, the bonding adopts a second bonding layer, the thickness of the second bonding layer is 2-5 mm, the material is epoxy resin adhesive, and the materials of the inner panel and the outer panel are bio-straw ecological board and bamboo fiberboard respectively.

[0027] The present invention also provides a method for preparing the above-mentioned chopped glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard, the steps are as follows:

[0028] S1. Preparation of chopped fiber reinforced alkali-activated foam concrete

[0029] S11, preparing foam according to the formula of foam concrete;

[0030] S12, stirring and mixing sodium hydroxide, water glass, sand, slag, fly ash, and chopped fibers to obtain mortar;

[0031] S13, adding foam to the mortar and stirring evenly to obtain chopped fiber reinforced alkali-activated foam coagulation;

[0032] S2. Preparation of sandwich layer

[0033] S21, preparing glass fiber three-dimensional fabric;

[0034] S22, after applying adhesive on the upper and lower surfaces of the glass fiber three-dimensional fabric, placing the glass fiber three-dimensional fabric with adhesive in a mold and drying for 0.5-3 hours;

[0035] S23, arranging a plurality of GFRP bars outside the upper and lower surfaces of the glass fiber three-dimensional fabric in the transverse direction, respectively, and the GFRP hoop is sleeved outside the GFRP bar and fixedly connected to the GFRP bar perpendicularly. When viewed from the side, the GFRP hoop is a quadrilateral, and the glass fiber three-dimensional fabric is sleeved inside it, and the two sides of the glass fiber three-dimensional fabric are stretched to apply a pre-tension of 10-15% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric;

[0036] S24, pouring the chopped fiber reinforced alkali-activated foamed concrete prepared in S1 into the mold;

[0037] S3, curing for 28-35 days, removing the mold after solidification and hardening, and obtaining a short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard;

[0038] Or, after curing for 28-35 days, the formwork is removed after solidification and hardening, and the inner panel and the outer panel are respectively bonded and fixed to the outside of the two surface layers to obtain a short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wall panel.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard of the present invention has a core layer composed of two structures of glass fiber three-dimensional fabrics. The honeycomb glass fiber three-dimensional fabric provides effective support and penetration. The 8-shaped glass fiber three-dimensional fabric reduces the weight of the wallboard while also meeting the requirements of bearing capacity and durability, giving full play to the respective advantages of the two glass fiber three-dimensional fabrics. The design of this product gives full play to the excellent characteristics of each component such as environmental protection, light weight, and heat insulation, and meets the strength requirements while facilitating the pouring and maintenance of the construction site. In addition, the core layer is filled with short-cut fiber reinforced alkali-activated foam concrete, and multi-component fibers are added to give full play to the performance of different fibers themselves, thereby improving various mechanical properties, durability, and high temperature resistance of the foam concrete.

[0041] The short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard of the present invention has a core layer and two surface layers connected by adhesives respectively, a three-dimensional frame of the glass fiber three-dimensional fabric is used as an internal frame, and GFRP bars and GFRP hoops are arranged for reinforcement, which can reduce the production cycle and construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are only some specific implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 It is a schematic structural diagram of the short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard of the present invention (the inner panel and the outer panel are not bonded);

[0044] Figure 2 It is a schematic diagram of the structure of the short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard of the present invention (bonding inner panel and outer panel);

[0045] Figure 3 It is a schematic structural diagram of the honeycomb glass fiber three-dimensional fabric of the alkali-activated foam composite material sandwich composite wallboard reinforced with the short glass fiber reinforced glass fiber three-dimensional fabric of the present invention;

[0046] In the figure, 1, surface layer; 2, connecting piece; 21, GFRP rib; 22, GFRP hoop; 3, sandwich layer; 31, honeycomb glass fiber three-dimensional fabric; 32, 8-shaped glass fiber three-dimensional fabric; 33, filling material; 4, first bonding layer; 5, inner panel, 6, outer panel, 7, second bonding layer. DETAILED DESCRIPTION

[0047] In order to further understand the present invention, preferred embodiments of the present invention are described below. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0048] like Figure 1 As shown, the short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard of the present invention includes two surface layers 1, a sandwich layer 3 fixed between the two surface layers 1, and a connecting piece 2 for connecting the two surface layers 1 and the sandwich layer 3.

[0049] In the above scheme, the two surfaces of the sandwich layer 3 are fixed to the two-sided layer 1 through the first adhesive layer 4 respectively. The thickness of the first adhesive layer 4 is 2-5 mm, and the material is epoxy resin adhesive, such as epoxy resin emulsion glue.

[0050] In the above scheme, the thickness of the sandwich layer 3 is preferably 45-50 mm. The sandwich layer 3 includes a glass fiber three-dimensional fabric and a filler 33 filled in the glass fiber three-dimensional fabric, and the glass fiber three-dimensional fabric is composed of a honeycomb glass fiber three-dimensional fabric 31 and an 8-shaped glass fiber three-dimensional fabric 32 stacked in sequence. The thickness of the honeycomb glass fiber three-dimensional fabric 31 and the 8-shaped glass fiber three-dimensional fabric 32 are 20-30 mm, preferably 22.5-25 mm, respectively, and the honeycomb glass fiber three-dimensional fabric 31 is 0-8 mm thinner than the 8-shaped glass fiber three-dimensional fabric 32.

[0051] like Figure 3 As shown, the upper and lower surfaces of each honeycomb unit of the honeycomb glass fiber three-dimensional fabric 31 are regular hexagons, preferably with a side length of 3-5 mm, and the six sides are all X-shaped glass fiber fabrics. The two endpoints on the left side of each X-shaped glass fiber fabric are respectively connected to the two endpoints on the right side of the adjacent X-shaped glass fiber fabric on the left, and the two endpoints on the right side of each X-shaped glass fiber fabric are respectively connected to the two endpoints on the left side of the adjacent X-shaped glass fiber fabric on the right. Preferably, the honeycomb glass fiber three-dimensional fabric 31 is pre-shaped using polyurethane resin, and the method is to immerse the honeycomb glass fiber three-dimensional fabric 31 in polyurethane resin, take it out and solidify it. When the honeycomb glass fiber three-dimensional fabric 31 is subjected to force, a plurality of staggered points will be formed. These staggered points enhance the overall tensile and shear resistance of the three-dimensional fabric, so that the honeycomb glass fiber three-dimensional fabric 31 exhibits a higher tensile strength when subjected to tension, and effectively enhances the shear resistance of the fabric, and helps to improve the bonding force between layers, reduce interlayer slippage and stratification, thereby enhancing the overall performance of the three-dimensional fabric.

[0052] The 8-shaped glass fiber three-dimensional fabric 32 is composed of two layers of glass fiber cloth and a number of evenly distributed core column yarns that are fixedly connected to the two layers of glass fiber cloth. The glass fiber cloth is woven from warp yarns and weft yarns. The core column yarns are in the shape of an 8 along the weft direction and in the shape of a 1 along the warp direction. Preferably, the spacing between two adjacent core column yarns is 0.5-1.5 mm. Preferably, the 8-shaped glass fiber three-dimensional fabric 32 is pre-shaped after being impregnated with polyurethane resin, and the method is to impregnate the 8-shaped glass fiber three-dimensional fabric 32 in polyurethane resin, take it out and solidify it into shape. The 8-shaped glass fiber three-dimensional fabric 32 can provide a more uniform stress distribution and reduce the local stress concentration phenomenon. The 8-shaped glass fiber three-dimensional fabric 32 has strong support in all directions, which reduces the relative slippage between fibers, thereby improving the overall structural stability of the three-dimensional fabric and enhancing the strength and stiffness of the fabric. It not only provides stronger overall support, but also reduces deformation.

[0053] The honeycomb glass fiber three-dimensional fabric 31 and the 8-shaped glass fiber three-dimensional fabric 32 are stacked to give full play to the respective advantages of the two three-dimensional fabrics, improve the mechanical properties of the product, and further improve the compression, tension and shear resistance of the product. The stacked structure improves the shear strength of the foam concrete. Experiments show that the shear strength can be increased by 20%-35%.

[0054] In the above scheme, the connecting member 2 includes a plurality of GFRP bars 21 and a plurality of GFRP hoops 22. The plurality of GFRP bars 21 are arranged in the two surface layers 1 in the transverse direction. The GFRP hoops 22 are sleeved outside the GFRP bars 21 in the two surface layers 1 and are vertically fixed to the GFRP bars 21. When viewed from the side, the GFRP hoops 22 are quadrilateral, and the glass fiber three-dimensional fabric is sleeved therein to form a three-dimensional grid structure.

[0055] In the above scheme, the materials of the surface layer 1 and the filler 33 are both chopped fiber reinforced alkali-activated foam concrete, and the total amount of chopped fibers added does not exceed 20wt% of the weight of the chopped fiber modified alkali-activated foam concrete. The chopped fibers include glass fibers, and at least one of basalt fibers, ceramic fibers, and carbon fibers. Preferably, the amount of basalt fibers added is 3-5wt%, the amount of glass fibers added is 3-5wt%, the amount of ceramic fibers added is 3-5wt%, and the amount of carbon fibers added is 3-5wt%. In the chopped fiber reinforced alkali-activated foam concrete, coarse aggregate is not added, but fine aggregate is used instead, and multi-component chopped fibers are added to enhance toughness, which can give full play to the improvement of the performance of each chopped fiber on the product itself. For example, the increase of basalt fibers can improve the compressive strength of the product. According to research, adding 5wt% of basalt fibers can increase the compressive strength of concrete by about 15%-25%. At the same time, basalt fibers can effectively inhibit the expansion of cracks in concrete and reduce cracks caused by shrinkage and temperature changes. The increase of carbon fibers improves the tensile strength of the product, and carbon fibers can significantly improve the toughness and crack resistance of concrete. Carbon fiber not only has high strength but also low density, and it contributes significantly to the overall performance improvement of concrete. The elastic modulus of carbon fiber is between 200-250GPa, which improves the deformation characteristics of concrete and enhances its anti-deformation ability. The addition of glass fiber improves the flexural strength of the product. Glass fiber has good adhesion to cement-based materials and can enhance the durability of concrete. The tensile strength of glass fiber is generally 500-700MPa, which plays a significant role in improving the tensile and crack resistance of concrete. Glass fiber has good tolerance to chemical corrosion and can improve the durability of concrete in harsh environments.

[0056] In the above scheme, alkali-activated foamed concrete is an existing material in the art. The present invention provides a short-cut fiber modified alkali-activated foamed concrete, but is not limited thereto. The raw materials include: foam and mortar; the volume of the foam accounts for 25%-30% of the total volume of the short-cut fiber modified alkali-activated foamed concrete, the bubble size of the foam is 0.5-1.0 mm, and the density of the foam is 80-100 kg / m 3 The mortar is composed of 1wt%-3wt% sodium hydroxide, 6wt%-9wt% water glass, 50wt%-55wt% sand, 12wt%-16wt% slag, 6wt%-9wt% fly ash, 6wt%-20wt% chopped fibers and 5wt%-19wt% water; the bulk density of the chopped fiber reinforced alkali-activated foam concrete is 120-130kg / m 3 .

[0057] like Figure 2As shown, the short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wall panel of the present invention also includes an inner panel 5 and an outer panel 6 respectively bonded and fixed to the outside of the two surface layers 1, the inner panel 5 is close to the 8-shaped glass fiber three-dimensional fabric 32, and the outer panel 6 is close to the honeycomb glass fiber three-dimensional fabric 31.

[0058] In the above scheme, the second adhesive layer 7 is used for bonding. The thickness of the second adhesive layer 7 is 2-5 mm and the material is epoxy resin adhesive. The materials of the inner panel 5 and the outer panel 6 are biological straw ecological board and bamboo fiberboard respectively.

[0059] The short-cut glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard of the present invention comprises the following steps:

[0060] S1. Preparation of chopped fiber reinforced alkali-activated foam concrete

[0061] S11. According to the relevant national standards for foamed concrete, determine the components and relevant proportions of foamed concrete, prepare foam of foamed concrete, the basic components of which are foaming agent, water, water glass and other substances, process in a foaming machine, prepare foam, and set aside;

[0062] S12, stirring and mixing sodium hydroxide, water glass, sand, slag, fly ash, chopped fibers and water to obtain mortar;

[0063] S13, adding foam to the mortar and stirring evenly to obtain chopped fiber reinforced alkali-activated foam concrete;

[0064] S2. Preparation of sandwich layer 3

[0065] S21, preparing glass fiber three-dimensional fabric;

[0066] S22, after applying adhesive on the upper and lower surfaces of the glass fiber three-dimensional fabric, placing the glass fiber three-dimensional fabric with adhesive in a mold and drying for 0.5-3 hours;

[0067] S23, a plurality of GFRP bars 21 are arranged laterally outside the upper and lower surfaces of the glass fiber three-dimensional fabric, and the GFRP hoop 22 is sleeved outside the GFRP bar 21 and fixedly connected to the GFRP bar 21 perpendicularly. When viewed from the side, the GFRP hoop 22 is a quadrilateral, and the glass fiber three-dimensional fabric is sleeved inside it, and both sides of the glass fiber three-dimensional fabric are stretched to apply a pre-tension of 10-15% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric;

[0068] S24, pouring the chopped fiber reinforced alkali-activated foam concrete prepared in S1 into a mold, curing in a standard curing room for 28-35 days, and removing the mold after solidification and hardening to obtain a chopped glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard;

[0069] Or, after curing for 28-35 days, the mold is removed after solidification and hardening, and the inner panel 5 and the outer panel 6 are respectively bonded and fixed to the outside of the two surface layers 1 to obtain a short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard.

[0070] It should be noted that the foam is a prior art and has no specific limitations. It can be prepared according to the corresponding national standards. For example, in some embodiments, the basic components are 0.15-0.25 parts of foaming agent, 9-15 parts of water and 3-5 parts of water glass by weight.

[0071] It should be noted that the preparation of glass fiber three-dimensional fabric is a prior art, and those skilled in the art can prepare the corresponding glass fiber three-dimensional fabric according to the structure limited by the present invention.

[0072] The terms used in the present invention generally have the meanings commonly understood by those of ordinary skill in the art, unless otherwise specified.

[0073] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with embodiments. The present invention will be further described below in conjunction with embodiments.

[0074] Example 1

[0075] The glass fiber three-dimensional fabric with a thickness of 50 mm is used, which is composed of honeycomb glass fiber three-dimensional fabric 31 and 8-shaped glass fiber three-dimensional fabric 32 stacked in sequence. The thickness of the first adhesive layer 4 is 5 mm. The specific preparation method is as follows:

[0076] S1. Preparation of chopped fiber reinforced alkali-activated foam concrete

[0077] S11. Determine the composition and proportion of foamed concrete according to relevant national standards for foamed concrete;

[0078] S12, prepare the foam of foamed concrete, the basic components are 0.2kg foaming agent, 12kg water, 5kg water glass, processed in a foaming machine, and a plant-based composite cement foaming agent (Jiukun Building Materials FP-50) is mixed with water in a mass ratio of 1:60 in the foaming pulping stage to prepare the foam for standby use;

[0079] S13, preparing short-cut fiber reinforced alkali-activated mortar, wherein the basic components are 1wt% sodium hydroxide, 6wt% water glass, 50wt% sand, 14wt% slag, 7wt% fly ash, 3wt% basalt fiber, 3wt% glass fiber, 3wt% carbon fiber, 3wt% ceramic fiber and 10wt% water, stirring and mixing evenly to obtain mortar;

[0080] S14, adding the prepared foam to the short-cut fiber reinforced alkali-activated mortar and stirring them thoroughly for use, and finally the bulk density of the short-cut fiber reinforced alkali-activated foam concrete is 120kg / m 3 ;

[0081] S2. Preparation of sandwich layer 3

[0082] S21, preparing a glass fiber three-dimensional fabric with a thickness of 50 mm, the honeycomb glass fiber three-dimensional fabric 31 has a thickness of 22 mm, the side length of the regular hexagon is 4 mm, the 8-shaped glass fiber three-dimensional fabric 32 has a thickness of 28 mm, and the distance between two adjacent core column yarns is 1 mm;

[0083] S22, prepare a mold of 3000mm×600mm×90mm, place the glass fiber three-dimensional fabric in the mold in advance, apply 5mm thick epoxy resin emulsion glue on the upper and lower surfaces of the glass fiber three-dimensional fabric, preliminarily dry, arrange a plurality of GFRP bars 21 outside the upper and lower surfaces of the glass fiber three-dimensional fabric in the transverse direction, and cover the GFRP hoop 22 outside the GFRP bar 21 and fix it perpendicularly to the GFRP bar 21. When viewed from the side, the GFRP hoop 22 is a quadrilateral, and the glass fiber three-dimensional fabric is covered therein to obtain a frame structure;

[0084] S23, fixing the glass fiber three-dimensional fabric on a stretching pedestal, horizontally stretching both sides of the glass fiber three-dimensional fabric on the stretching pedestal, and applying a pre-tensioning force of 10% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric to the fabric;

[0085] S24, pouring the prepared chopped fiber reinforced alkali-activated foamed concrete into the mold as a whole;

[0086] S3. Place the concrete in a standard curing room for 28 days, remove the formwork after solidification and hardening, and complete the preparation of the alkali-activated foam concrete wallboard reinforced with chopped fiber-reinforced glass fiber three-dimensional fabric.

[0087] Compared with ordinary wallboards, the chopped fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foamed concrete wallboard of Example 1 has a wallboard with solid concrete replaced by fabric + foamed concrete. The overall mass of the wallboard of the same volume is reduced by 8%. Compared with ordinary foamed concrete wallboards, the addition of fabric as a reinforcing material increases the overall bending strength by 9.3%. The chopped fibers in the glass fiber fabric and the foamed concrete have high durability. Compared with ordinary concrete wallboards, the overall durability is increased by 10%, and the alkali resistance is improved. The detection method refers to GB / T 23451-2009 "Lightweight partition board for construction".

[0088] Example 2

[0089] An inner panel 5 and an outer panel 6 are added outside the two surface layers 1 of the chopped fiber reinforced alkali-activated foam concrete. The thickness of the inner panel 5 and the outer panel 6 are both 7mm. The outer panel 6 is made of bamboo fiberboard, and the inner panel 5 is made of biological straw ecological board. A 50mm thick glass fiber three-dimensional fabric is used, which is composed of a honeycomb glass fiber three-dimensional fabric 31 and an 8-shaped glass fiber three-dimensional fabric 32 stacked in sequence. The coating thickness of the first adhesive layer 4 is 5mm. The specific preparation method is as follows:

[0090] S1. Preparation of chopped fiber reinforced alkali-activated foam concrete

[0091] S11. Determine the composition and proportion of foamed concrete according to relevant national standards for foamed concrete;

[0092] S12, prepare the foam of foamed concrete, the basic components are 0.16kg foaming agent, 9.6kg water, 3.2kg water glass, processed in a foaming machine, and a plant-based composite cement foaming agent (Jiukun Building Materials FP-50) is mixed with water in a mass ratio of 1:60 in the foaming pulping stage to prepare the foam for standby use;

[0093] S13, preparing alkali-activated mortar, wherein the basic components are 1wt% sodium hydroxide, 8wt% water glass, 52wt% sand, 12wt% slag, 6wt% fly ash, 3wt% basalt fiber, 3wt% carbon fiber, 3wt% glass fiber, 3wt% ceramic fiber and 9wt% water, stirring and mixing to obtain mortar;

[0094] S14, adding the prepared foam to the short-cut fiber reinforced alkali-activated mortar and stirring them thoroughly for use. The final bulk density of the short-cut fiber reinforced alkali-activated foam concrete is 130kg / m 3 ;

[0095] S2. Preparation of sandwich layer 3

[0096] S21, preparing a glass fiber three-dimensional fabric with a thickness of 50 mm, the honeycomb glass fiber three-dimensional fabric 31 has a thickness of 24 mm, the side length of the regular hexagon is 4 mm, the 8-shaped glass fiber three-dimensional fabric 32 has a thickness of 26 mm, and the spacing between two adjacent core column yarns is 1 mm;

[0097] S22, prepare a mold of 3000mm×600mm×90mm, place the glass fiber three-dimensional fabric in the mold in advance, apply 5mm thick epoxy resin emulsion glue on the upper and lower surfaces of the glass fiber three-dimensional fabric, preliminarily dry, arrange a plurality of GFRP bars 21 outside the upper and lower surfaces of the glass fiber three-dimensional fabric in the transverse direction, and cover the GFRP hoop 22 outside the GFRP bar 21 and fix it perpendicularly to the GFRP bar 21. When viewed from the side, the GFRP hoop 22 is a quadrilateral, and the glass fiber three-dimensional fabric is covered therein to obtain a frame structure;

[0098] S23, fixing the frame structure on a stretching pedestal, transversely stretching both sides of the glass fiber three-dimensional fabric on the stretching pedestal, and applying a pre-tensioning force of 10% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric to the fabric;

[0099] S24, pouring the prepared chopped fiber reinforced alkali-activated foamed concrete into the mold as a whole;

[0100] S3, placed in a standard curing room for 28 days, and removed from the mould after solidification and hardening;

[0101] S4, bonding the double-sided layer 1 to the inner panel 5 and the outer panel 6

[0102] S41, 2 mm of epoxy resin emulsion glue is applied to the surface of the double-sided layer 1, the outer panel 6 is made of bamboo fiberboard, and the inner panel 5 is made of biological straw ecological board, and the double-sided layer 1 is bonded to the inner panel 5 and the outer panel 6 respectively, the honeycomb glass fiber three-dimensional fabric 31 is close to the outer panel 6, and the 8-shaped glass fiber three-dimensional fabric 32 is close to the inner panel 5;

[0103] S42, pressing and fixing the double-sided layer 1, the inner panel 5 and the outer panel 6 into one body by a cold press; completing the preparation of the chopped fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam concrete wallboard.

[0104] Compared with ordinary wallboards, the chopped fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foamed concrete wallboard of Example 2 has a wallboard with solid concrete replaced by fabric + foamed concrete. The overall mass of the wallboard of the same volume is reduced by 10%. Compared with ordinary foamed concrete wallboards, the addition of fabric as a reinforcing material increases the overall strength by 7.5%. The glass fiber fabric and other chopped fibers in the foamed concrete have high durability. Compared with ordinary concrete wallboards, the overall durability is increased by 12%, and the alkali resistance is improved. The detection method refers to GB / T 23451-2009 "Lightweight partition board for construction".

[0105] Comparative Example 1

[0106] The thickness of the outer panel and the inner panel are both 8mm, the outer panel is made of bamboo fiberboard, and the inner panel is made of magnesium straw ecological board. The thickness of the glass fiber three-dimensional fabric is 48mm, and the three-dimensional fabric contains double-layer honeycomb glass fiber. The thickness of the adhesive layer is 3mm. The specific preparation method is as follows:

[0107] S1. Preparation of alkali activated foam concrete

[0108] S11. Determine the composition and proportion of foamed concrete according to relevant national standards for foamed concrete;

[0109] S12, making foam of foamed concrete, the basic components are 0.15kg foaming agent, 9kg water, 3.2kg water glass, processed in a foaming machine, and a plant-based composite cement foaming agent (Jiukun Building Materials FP-50) is mixed with water in a mass ratio of 1:60 in the foaming pulping stage to prepare the foam for standby use;

[0110] S13, preparing alkali-activated mortar, wherein the basic components are 8wt% sodium hydroxide, 12wt% water glass, 47wt% sand, 13wt% slag, 10wt% fly ash and 10wt% water, stirring and mixing evenly to obtain mortar;

[0111] S14. Add the prepared foam to the alkali-activated mortar and mix thoroughly. Stir for 120 seconds. After mixing, pour it into the mold for shaking and smoothing. Cover with plastic wrap and place in an environment of 20±2° for curing. The bulk density is 130kg / m 3 ;

[0112] S2. Preparation of sandwich layer

[0113] S21, preparing a honeycomb glass fiber three-dimensional fabric with a thickness of 45 mm, wherein the side length of the regular hexagon is 4 mm;

[0114] S22, prepare a mold of 3000mm×600mm×90mm, place the glass fiber three-dimensional fabric in the mold in advance, apply 5mm thick epoxy resin emulsion glue on the upper and lower surfaces of the glass fiber three-dimensional fabric, preliminarily dry, arrange a plurality of GFRP bars 21 outside the upper and lower surfaces of the glass fiber three-dimensional fabric in the transverse direction, and cover the GFRP hoop 22 outside the GFRP bar 21 and fix it perpendicularly to the GFRP bar 21. When viewed from the side, the GFRP hoop 22 is a quadrilateral, and the glass fiber three-dimensional fabric is covered therein to obtain a frame structure;

[0115] S23, fixing the glass fiber three-dimensional fabric on a stretching stand, horizontally stretching both sides of the three-dimensional fabric on the stretching stand, and applying a pre-tensioning force of 10% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric to the three-dimensional fabric;

[0116] S24, integrally pouring the prepared chopped fiber reinforced alkali-activated foamed concrete into the mold, placing it in a standard curing room for 28 days, and removing the mold after solidification and hardening to obtain a sandwich layer;

[0117] S3. Bonding the sandwich layer to the inner and outer panels

[0118] S31. Apply 1.5 mm thick polyurethane emulsion glue to the surfaces of the sandwich layer, the inner panel and the outer panel, and bond the sandwich layer between the inner panel and the outer panel, and press and fix them into one piece;

[0119] S32, after solidification and hardening, the formwork is removed to obtain a single-structure glass fiber three-dimensional fabric alkali-activated foam concrete wall panel.

[0120] The single-structure glass fiber three-dimensional fabric in Comparative Example 1 cannot provide the bearing capacity advantage and durability of the 8-shaped glass fiber three-dimensional fabric compared to the double-structure glass fiber three-dimensional fabric of the present invention. At the same time, no various types of chopped fibers are added inside, and the original ordinary foam concrete is used, which no longer has the reinforcing effect of the chopped fibers. The bending bearing capacity test is carried out on it with a universal testing machine with reference to GB / T 23451-2009 "Lightweight partition board for construction", and the overall bearing capacity is expected to be reduced by 10%.

[0121] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard, characterized in that: It comprises two surface layers (1), a core layer (3) fixed between the two surface layers (1), and a connecting piece (2) used for connecting the two surface layers (1) and the core layer (3); The sandwich layer (3) comprises a glass fiber three-dimensional fabric and a filler (33) filled in the glass fiber three-dimensional fabric, wherein the glass fiber three-dimensional fabric is composed of a honeycomb glass fiber three-dimensional fabric (31) and an 8-shaped glass fiber three-dimensional fabric (32) stacked in sequence; The materials of the surface layer (1) and the filler (33) are both chopped fiber modified alkali-activated foam concrete, and the chopped fibers include glass fibers.

2. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: The two surfaces of the sandwich layer (3) are respectively fixed to the two surface layers (1) through the first adhesive layer (4); the thickness of the first adhesive layer (4) is 2-5 mm, and the material is epoxy resin adhesive.

3. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: The total thickness of the sandwich layer (3) is 45-50 mm, the thicknesses of the honeycomb glass fiber three-dimensional fabric (31) and the 8-shaped glass fiber three-dimensional fabric (32) are respectively 20-30 mm, and the honeycomb glass fiber three-dimensional fabric (31) is 0-8 mm thinner than the 8-shaped glass fiber three-dimensional fabric (32).

4. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: The upper and lower surfaces of each honeycomb unit of the honeycomb glass fiber three-dimensional fabric (31) are both regular hexagons, and the six side surfaces are all X-shaped glass fiber fabrics, the two end points on the left side of each X-shaped glass fiber fabric are respectively connected to the two end points on the right side of the adjacent X-shaped glass fiber fabric on the left, and the two end points on the right side of each X-shaped glass fiber fabric are respectively connected to the two end points on the left side of the adjacent X-shaped glass fiber fabric on the right; The side length of the regular hexagon is 3-5 mm; And / or, the honeycomb glass fiber three-dimensional fabric (31) is pre-shaped using polyurethane resin.

5. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: The 8-shaped glass fiber three-dimensional fabric (32) is composed of two layers of glass fiber cloth and a plurality of evenly distributed core column yarns fixedly connecting the two layers of glass fiber cloth, the glass fiber cloth is woven from warp yarns and weft yarns, the core column yarns are in the shape of an 8 along the weft direction and in the shape of a 1 along the warp direction; The distance between two adjacent core yarns is 0.5-1.5mm; And / or, the 8-shaped glass fiber three-dimensional fabric (32) is pre-shaped by using polyurethane resin.

6. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: The connecting member (2) comprises a plurality of GFRP bars (21) and a plurality of GFRP hoops (22). The plurality of GFRP bars (21) are arranged in the two surface layers (1) in a transverse direction. The GFRP hoops (22) are sleeved outside the GFRP bars (21) in the two surface layers (1) and are vertically fixedly connected to the GFRP bars (21). When viewed from the side, the GFRP hoops (22) are quadrilateral and sleeve the glass fiber three-dimensional fabric inside.

7. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: The raw materials of the chopped fiber modified alkali-activated foam concrete include: foam and mortar; The volume of the foam accounts for 25%-30% of the total volume of the chopped fiber modified alkali-activated foam concrete, the bubble size of the foam is 0.5-1.0 mm, and the density of the foam is 80-100 kg / m 3 ; The mortar is composed of 1wt%-3wt% sodium hydroxide, 6wt%-9wt% water glass, 50wt%-55wt% sand, 12wt%-16wt% slag, 6wt%-9wt% fly ash, 6wt%-20wt% chopped fibers and 5wt%-19wt% water; The chopped fibers further include at least one of basalt fibers, ceramic fibers and carbon fibers, wherein the addition amount of basalt fibers accounts for 3wt%-5wt% of the mortar, the addition amount of glass fibers accounts for 3wt%-5wt% of the mortar, the addition amount of ceramic fibers accounts for 3wt%-5wt% of the mortar, and the addition amount of carbon fibers accounts for 3wt%-5wt% of the mortar; The bulk density of the chopped fiber reinforced alkali activated foam concrete is 120-130 kg / m 3 .

8. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 1, characterized in that: It also includes an inner panel (5) and an outer panel (6) which are respectively bonded and fixed to the outside of the two surface layers (1), wherein the inner panel (5) is close to the 8-shaped three-dimensional glass fiber fabric (32), and the outer panel (6) is close to the honeycomb-shaped three-dimensional glass fiber fabric (31).

9. The short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to claim 8, characterized in that: The bonding adopts a second bonding layer (7), the thickness of the second bonding layer (7) is 2-5 mm, and the material is epoxy resin adhesive. The materials of the inner panel (5) and the outer panel (6) are biological straw ecological board and bamboo fiberboard respectively.

10. The method for preparing the chopped glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard according to any one of claims 1 to 9, characterized in that: Here are the steps: S1. Preparation of chopped fiber reinforced alkali-activated foam concrete S11, preparing foam according to the formula of foam concrete; S12, stirring and mixing sodium hydroxide, water glass, sand, slag, fly ash, chopped fibers and water to obtain mortar; S13, adding foam to the mortar and stirring evenly to obtain chopped fiber reinforced alkali-activated foam concrete; S2. Preparation of sandwich layer (3) S21, preparing glass fiber three-dimensional fabric; S22, after applying adhesive on the upper and lower surfaces of the glass fiber three-dimensional fabric, placing the glass fiber three-dimensional fabric with adhesive in a mold and drying for 0.5-3 hours; S23, a plurality of GFRP bars (21) are arranged transversely outside the upper and lower surfaces of the glass fiber three-dimensional fabric, and a GFRP hoop (22) is sleeved outside the GFRP bar (21) and fixedly connected to the GFRP bar (21) perpendicularly. When viewed from the side, the GFRP hoop (22) is in a quadrilateral shape, and the glass fiber three-dimensional fabric is sleeved inside the GFRP hoop. Both sides of the glass fiber three-dimensional fabric are stretched to apply a pre-tension of 10-15% of the ultimate tensile bearing capacity of the glass fiber three-dimensional fabric; S24, pouring the chopped fiber reinforced alkali-activated foamed concrete prepared in S1 into the mold; S3, curing for 28-35 days, removing the mold after solidification and hardening, and obtaining a short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite sandwich composite wallboard; Or, after curing for 28-35 days, the mold is removed after solidification and hardening, and the inner panel (5) and the outer panel (6) are respectively bonded and fixed outside the two surface layers (1) to obtain a short glass fiber reinforced glass fiber three-dimensional fabric reinforced alkali-activated foam composite material sandwich composite wallboard.

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