阅读说明：本技术 应用于增强混凝土的改性玻璃钢筋、制备方法及其用途 (Modified glass reinforced bar applied to reinforced concrete, preparation method and application thereof ) 是由 池立群 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种应用于增强混凝土的改性玻璃钢筋、制备方法及其用途。该改性玻璃钢筋通过连续玻璃纤维在不饱和聚酯树脂溶液中浸渍,浸渍后的连续玻璃纤维连续挤拉成型,经切割得到,其中,不饱和聚酯树脂溶液包含：不饱和聚酯树脂、芳纶原纤纤维及无机纤维。本发明提供的改进玻璃钢筋,强度大幅提高,玻璃钢筋-钢筋与混凝土的相容性良好,解决了聚合物材料与混凝土性能差异较大的问题,从而增强混凝土的强度,以及提高混凝土材料的防腐蚀性和防渗水性。且制备方法节能环保,能制备高强度标准的混凝土材料,尤其适用于承重墙等对混凝土强度要求高的建筑材料。(The invention discloses a modified glass reinforced bar applied to reinforced concrete, a preparation method and application thereof. The modified glass reinforcing steel bar is obtained by impregnating continuous glass fibers in an unsaturated polyester resin solution, continuously extruding and drawing the impregnated continuous glass fibers, and cutting, wherein the unsaturated polyester resin solution comprises: unsaturated polyester resin, aramid fibril fiber and inorganic fiber. The improved glass reinforced bar provided by the invention has the advantages that the strength is greatly improved, the compatibility between the glass reinforced bar and the concrete is good, and the problem of larger performance difference between a polymer material and the concrete is solved, so that the strength of the concrete is enhanced, and the corrosion resistance and the water seepage resistance of the concrete material are improved. The preparation method is energy-saving and environment-friendly, can prepare the concrete material with high strength standard, and is particularly suitable for building materials such as bearing walls and the like with high requirements on the strength of the concrete.)

1. The modified glass reinforced plastic bar applied to reinforced concrete is characterized in that continuous glass fibers are soaked in an unsaturated polyester resin solution, the soaked continuous glass fibers are continuously extruded and drawn to form, and the modified glass reinforced plastic bar is obtained by cutting, wherein the unsaturated polyester resin solution comprises: unsaturated polyester resin, aramid fibril fiber and inorganic fiber; wherein:

the inorganic fiber is selected from one or a mixture of more than two of wollastonite, calcium carbonate and attapulgite.

2. The modified glass reinforced bar for reinforcing concrete according to claim 1, wherein the unsaturated polyester resin matrix is selected from the group consisting of: phthalic acid type, isophthalic acid type, bisphenol A type, and vinyl ester type, halogenated unsaturated polyester resins.

3. The modified glass reinforced plastic bar for reinforcing concrete as claimed in claim 1, wherein the modified glass reinforced plastic bar has a tensile strength of 200-700MPa and a bending strength of 300-500 MPa.

4. The modified glass fiber reinforced plastic bar for reinforcing concrete as claimed in claim 1, wherein the aspect ratio of the inorganic fiber is (10-20):1, the tensile strength of the modified glass fiber reinforced plastic bar can reach 200-400MPa, and the bending strength can reach 300-400 MPa.

5. The modified glass reinforced bar for reinforcing concrete according to claim 1, wherein the unsaturated polyester resin solution further comprises: 3-6 parts of polypropylene resin or polyamide resin, wherein the modified glass reinforced bar is a thermoplastic glass reinforced bar, the tensile strength can reach 400-700MPa, and the bending strength can reach 400-500 MPa.

6. A method for preparing a modified glass fibre reinforced bar for reinforcing concrete according to any one of claims 1 to 5, comprising:

step 1, uniformly mixing aramid fibril fibers and inorganic fibers into an unsaturated polyester system to obtain an unsaturated polyester resin solution;

step 2, impregnating the continuous glass fiber with the unsaturated polyester resin solution;

and 3, forming the impregnated continuous glass fiber by adopting a continuous extrusion-drawing process, and cutting to obtain the modified glass reinforcing steel bar.

7. The method of claim 6, wherein in the step 1, a polypropylene resin or a polyamide resin is further mixed into the unsaturated polyester system.

8. Use of a modified glass fibre reinforced bar according to any one of claims 1 to 5 for reinforcing concrete, which is capable of partially or completely replacing the reinforcing bar to reinforce the concrete material.

9. Use of a modified glass fibre reinforced bar for reinforcing concrete according to claim 8, wherein the reinforced concrete material comprises:

s1, bundling glass steel bars or the combination of the glass steel bars and steel bars into a steel bar cage, and molding;

s2, adding 10-20 parts by weight of hydrogel resin into every hundred parts by weight of water for preparing concrete to prepare the concrete;

s3, adding the S2 concrete mixed with the hydrogel into the S1 mold for curing to obtain the reinforced concrete material.

10. The use of the modified glass reinforced plastic for reinforced concrete according to claim 8, wherein the reinforced concrete material is used for load-bearing walls.

Technical Field

The invention relates to a building material, relates to a modified glass steel bar applied to reinforced concrete, a preparation method and application thereof, and particularly relates to a modified glass steel bar playing a reinforcing role in a glass steel bar-steel bar mixed reinforced concrete material.

Background

The bearing wall is a wall body for supporting the weight of an upper floor, is a ridge beam for supporting a building, and is an important part for determining indoor safety. With the current demand for floor height, the strength requirements of the concrete constituting the load-bearing wall are becoming higher and higher.

The basic strength indexes of concrete are three: cubic concrete compressive strength, axial concrete compressive strength (or prismatic strength), and tensile strength of concrete.

Concrete cube compressive strength: the strength of the concrete cubic test piece is relatively stable, and the value is taken as a basic index of the concrete strength in China. According to the numerical value of the concrete cube standard value of strength, the concrete structure design specification GB50010-2001 (hereinafter referred to as the specification) stipulates that the concrete strength grade is 14: c15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80. Wherein the symbol C represents Concrete (Concrete), the following numbers represent standard values of cubic compression resistance in N/mm²。

Axial compressive strength (or prismatic strength) of concrete: the prism (the height is larger than the side length) test piece can better reflect the actual pressure resistance of the concrete member than the cube test piece. In engineering, the length of a reinforced concrete axial compression member, such as a column, a roof truss compression chord member and the like, is much larger than the size of a cross section, and the concrete strength of the member is close to the axial compression strength of a concrete prism. When the member is designed, the axial compressive strength is mostly adopted as the concrete strength.

Tensile strength of concrete: the tensile strength of concrete is generally low, only 1/181/8 times the compressive strength, and does not increase in proportion to the compressive strength. The crack resistance, shear resistance, torsional bearing capacity and the like of the reinforced concrete are all related to the tensile strength of the concrete. In the theory of concrete strength under multiaxial stress conditions, the tensile strength of concrete is a very important parameter.

In order to improve the defects of poor tensile property, poor ductility and the like of concrete, research on improving the performance of concrete by adding fibers into the concrete is developed quite rapidly. Steel fiber, alkali-resistant glass fiber, carbon fiber, aramid fiber, polypropylene fiber or nylon synthetic fiber concrete and the like are widely studied.

Among them, glass reinforced concrete/steel reinforced concrete has many excellent properties such as high strength, corrosion resistance, leakage resistance, low weight, convenient operation, etc., and has been reported and put to practical use. However, when the polymer material is introduced into concrete materials with greatly different properties, the structure and the properties of the concrete materials are not perfect, and the concrete materials have many aspects which are worthy of modification.

Disclosure of Invention

The invention aims to modify and improve the strength and the performance of glass steel bars applied to glass steel bar/steel bar mixed reinforced concrete, and the glass steel bars are improved, and hydrogel resin is added to improve the compatibility of the glass steel bars, the steel bars and the concrete, so that the strength of the concrete is enhanced.

In order to achieve the above object, the present invention provides a modified glass fiber reinforced plastic bar for reinforced concrete, which is obtained by impregnating continuous glass fibers in an unsaturated polyester resin solution, continuously pultrusion forming the impregnated untwisted glass fiber filaments, and cutting, wherein the unsaturated polyester resin solution comprises: unsaturated polyester resin, aramid fibril fiber and inorganic fiber; wherein:

60-70 parts by weight of continuous glass fiber;

20-30 parts of unsaturated polyester resin;

1-3 parts of aramid fibril fibers;

10-20 parts of inorganic fiber;

the inorganic fiber is selected from one or a mixture of more than two of wollastonite, calcium carbonate and attapulgite.

Preferably, the unsaturated polyester resin matrix is selected from: phthalic acid type, isophthalic acid type, bisphenol A type, and vinyl ester type, halogenated unsaturated polyester resins.

Preferably, the tensile strength of the modified glass reinforced plastic is 200-700MPa, and the bending strength is 300-500 MPa.

Preferably, the length-diameter ratio of the inorganic fiber is (10-20):1, the tensile strength of the modified glass reinforced bar can reach 200-400MPa, and the bending strength can reach 300-400 MPa.

Preferably, the unsaturated polyester resin solution further comprises: 3-6 parts of polypropylene resin or polyamide resin, wherein the modified glass reinforced bar is a thermoplastic glass reinforced bar, the tensile strength can reach 400-700MPa, and the bending strength can reach 400-500 MPa.

The invention also provides a preparation method of the modified glass reinforced plastic bar applied to reinforced concrete, which comprises the following steps:

step 1, uniformly mixing aramid fibril fibers and inorganic fibers into an unsaturated polyester system to obtain an unsaturated polyester resin solution;

step 2, impregnating the continuous glass fiber with the unsaturated polyester resin solution;

and 3, forming the impregnated continuous glass fiber by adopting a continuous extrusion-drawing process, and cutting to obtain the modified glass reinforcing steel bar.

Preferably, in step 1, a polypropylene resin or a polyamide resin is further mixed into the unsaturated polyester system.

The invention also provides the application of the modified glass reinforced bar, which can partially replace the reinforced bar or completely replace the reinforced bar to reinforce the concrete material.

Preferably, said reinforced concrete material comprises:

s1, bundling glass steel bars or the combination of the glass steel bars and steel bars into a steel bar cage, and molding;

s2, adding 10-20 parts by weight of hydrogel resin into every hundred parts by weight of water for preparing concrete to prepare the concrete;

s3, adding the S2 concrete mixed with the hydrogel into the S1 mold for curing to obtain the reinforced concrete material.

Preferably, the reinforced concrete material can be used for a load-bearing wall.

The glass reinforcing steel bar prepared by the continuous filament glass fiber continuous pultrusion process is an anisotropic material, and in order to improve the transverse performance of the material, the invention introduces aramid fibril fibers and inorganic fiber fillers with high length-diameter ratio into the impregnated unsaturated polyester resin, thereby greatly improving the transverse strength and simultaneously improving the comprehensive performance of the glass reinforcing steel bar, including the longitudinal strength.

The invention adopts the continuous filament glass fiber continuous pultrusion process to prepare the thermosetting resin-based and thermoplastic resin-based glass reinforcing steel bars, adopts the continuous glass fiber as the long fiber, can improve the tensile strength and the bending strength of the glass reinforcing steel bars by times compared with the glass fiber (conventional short fiber) with the length of a few millimeters, overcomes the random nonuniformity of the strength of common glass reinforcing steel products, can adopt more glass reinforcing steel bars for the glass reinforcing steel bar/reinforcing steel bar mixed reinforced concrete, and keeps and improves the comprehensive performance of the material.

The invention has the beneficial effects that: 1) the strength of the improved glass reinforced plastic is greatly improved; 2) the weight is light, the building load can be effectively reduced, the labor intensity is reduced, and the production efficiency is improved; 3) the compatibility of the glass reinforced bar-reinforcing bar and concrete is good, and the problem of large difference between the performances of the polymer material and the concrete is solved; the strength of the reinforced concrete material provided by the reinforced concrete is greatly improved, and the corrosion resistance and water seepage resistance of the concrete material are improved; 4) the preparation method is energy-saving and environment-friendly, can prepare the concrete material with high strength standard, and is particularly suitable for building materials such as bearing walls and the like with high requirements on the strength of the concrete.

Detailed Description

The concrete is commercially available common concrete, and is artificial stone prepared by mixing cement serving as a main cementing material, water, sand, stones and chemical additives and mineral additives in a proper proportion and uniformly stirring, compacting, forming, curing and hardening.

The term "steel bar (Rebar)" as used herein means a steel material for reinforced concrete and prestressed reinforced concrete, which has a circular cross section and sometimes a square cross section with rounded corners. Including plain round steel bars, ribbed steel bars, twisted steel bars, and the like.

Glass fiber (original English name: glass fiber) is an inorganic non-metallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, but has the defects of brittleness and poor wear resistance. The hair-care fiber is made of seven kinds of ores of pyrophyllite, quartz sand, limestone, dolomite, borocalcite and boromagnesite through the processes of high-temperature melting, wire drawing, winding, weaving and the like, wherein the diameter of each monofilament ranges from several micrometers to twenty micrometers, the monofilament is equivalent to 1/20-1/5 of one hair, and each bundle of fiber precursor consists of hundreds of even thousands of monofilaments. Glass fibers are commonly used as reinforcing materials in composite materials, electrical and thermal insulation materials, circuit substrates, and other various fields of the national economy.

The pultrusion process is a method for continuously producing composite material section, which comprises the steps of impregnating twistless glass fiber roving on a creel with resin, other continuous reinforcing materials, polyester surface felt and the like, keeping a forming die with a certain section shape, curing and forming in the die, and then continuously demoulding to form a pultrusion product.

The glass reinforced plastic bar-steel bar mixed reinforced concrete material is used for reinforcing concrete by glass reinforced plastic bars and steel bars.

The glass reinforced bar provided by the invention comprises a thermosetting resin-based glass reinforced bar and a thermoplastic resin-based glass reinforced bar. The invention improves the performance of the glass reinforced plastic bar, and comprises the following steps: the strength of the glass reinforced plastic bar is improved, the anisotropy is improved, the compatibility with concrete is improved, and the leakage resistance and the corrosion resistance of the concrete are improved.

The thermosetting resin-based glass reinforcing steel bar is prepared by adopting a continuous filament glass fiber continuous extrusion and drawing process, the tensile strength can reach 200-300MPa, and the bending strength can reach 250-300 MPa.

In the process of preparing the thermosetting resin-based glass reinforcing steel bar by the continuous filament glass fiber continuous extrusion drawing process, aramid fibril fiber and inorganic fiber filler with high length-diameter ratio are adopted, the length-diameter ratio is 10-20:1, unsaturated polyester resin is introduced, the tensile strength can reach 200-400MPa, and the bending strength can reach 300-400 MPa.

And then introducing polypropylene resin or polyamide resin, and preparing the thermoplastic resin-based glass reinforcing steel bar by adopting a continuous filament glass fiber continuous extrusion and drawing process, wherein the tensile strength can reach 400-700MPa, and the bending strength can reach 400-500 MPa.

Preparing concrete materials with corresponding standards: according to the concrete specification, quantitative glass reinforced bars, reinforcing steel bars and hydrogel are introduced. Specifically, the modified glass steel bars partially replace steel bars or completely replace steel bars to form a steel bar cage, and a mold is formed; the hydrogel resin is introduced into the existing cement for preparing concrete, and then the cement is added into a mold for curing to obtain the reinforced concrete material, wherein the permeability resistance, the corrosion resistance and the compatibility with glass reinforced bars are greatly improved.

The hydrogel resin refers to acrylic hydrogel resin.