Foaming EGC material and preparation method thereof

Abstract

The invention relates to the technical field of geopolymer composite materials, in particular to a foamed EGC material and a preparation method thereof. The composite material comprises the following components: slag, fly ash, silica fume, No.9 sand, barium chloride, styrene-acrylic emulsion, water, sodium hydroxide, sodium silicate and PE fibers. A large amount of solid waste slag and fly ash are used as gel materials, the use amount of ordinary Portland cement is reduced, production energy consumption and environmental pollution are reduced, and the method is green and environmentally friendly. The prepared composite material has the advantages of low density, compact microstructure bridging and high ductility. The material can be used in sandwich wallboards, road post-cast strips and other structures, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of geopolymer composite materials, in particular to a foamed EGC material and a preparation method thereof. Background Art

[0002] In recent years, the proportion of building energy consumption in the total social energy consumption has increased year by year. With the increasing requirements for green environmental protection and building energy conservation, the demand for inorganic building insulation materials will increase significantly. Foamed geopolymer is a new type of inorganic insulation material containing a large number of closed pores, which can be used in the field of building insulation.

[0003] Geopolymer materials have advantages such as high compressive strength and low cost, but as a brittle material, they have low flexural and tensile strength and are prone to cracking, which often leads to reduced structural bearing capacity and durability. Ultra-high ductility geopolymer-based composite materials (Engineered Geopolymer Composite, referred to as EGC) are geopolymers with an appropriate amount of fiber added to them, which significantly changes their brittle characteristics, giving them superior tensile properties and super toughness, overcoming many defects caused by brittle failure of materials, and having good crack control capabilities, which is also very beneficial to the requirements of some special structures for crack width control. Summary of the invention

[0004] The object of the present invention is a foamed EGC material to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a foamed EGC material, comprising the following components, slag, fly ash, silica ash, No. 9 sand, barium chloride, styrene-acrylic emulsion, water, sodium hydroxide, sodium silicate, PE fiber, the slag, fly ash and silica ash constitute a cementitious material, and the proportion of each component is designed as follows: by mass: slag: 338 parts, fly ash: 225 parts, silica ash: 77 parts, No. 9 sand: 192 parts, barium chloride: 6 parts, styrene-acrylic emulsion: 26 parts, water: 90 parts, sodium hydroxide: 20 parts, sodium silicate: 219 parts, PE fiber 10 parts.

[0006] Preferably, the slag is blast furnace S105 slag.

[0007] Preferably, the fly ash is Class F fly ash.

[0008] Preferably, the No. 9 sand has a particle size of about 76um-150um and a density of 2.65g / cm 3 of quartz sand.

[0009] Preferably, the PE fiber is an ultra-high molecular weight polyethylene fiber with a single fiber length of 12 mm and a diameter of 24 μm.

[0010] A method for preparing a lightweight foamed fiber geopolymer-based composite material comprises the following steps:

[0011] Step 1: first dissolve the sodium hydroxide solid and mix it with the sodium silicate solution to form an alkaline excitation solution;

[0012] Step 2: First, put slag, fly ash, silica fume and No. 9 sand into a mortar planetary mixer and stir at low speed for 3 minutes;

[0013] Step 3: Slowly pour the alkali-activated solution and styrene-acrylic emulsion into the mixture, stir at low speed for 2 minutes, then at high speed for 1 minute.

[0014] Step 4: Sprinkle the fibers evenly within 2 minutes, and then stir at high speed for 1 minute to obtain the foamed EGC material.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention uses a large amount of solid waste slag and fly ash as gel material, which reduces the use of ordinary Portland cement, reduces production energy consumption and environmental pollution, and is green and environmentally friendly.

[0017] 2. The composite material prepared by the present invention has the advantages of low density, tight microstructure bridging and high ductility.

[0018] 3. The present invention can be used in structures such as sandwich wall panels and highway post-cast strips by utilizing its characteristics to extend their service life. DETAILED DESCRIPTION

[0019] In order to more fully explain the implementation of the present invention, the present invention is further described below in conjunction with specific embodiments. The examples are only used to explain the present invention, rather than to limit the scope of the present invention.

[0020] A foamed EGC material comprises the following components: slag, fly ash, silica fume, No. 9 sand, barium chloride, styrene-acrylic emulsion, water, sodium hydroxide, sodium silicate, and PE fiber. The slag, fly ash, and silica fume constitute a cementitious material. The mixing ratio of each component is designed as follows: by mass: 338 parts of slag, 225 parts of fly ash, 77 parts of silica fume, 192 parts of No. 9 sand, 6 parts of barium chloride, 26 parts of styrene-acrylic emulsion, 90 parts of water, 20 parts of sodium hydroxide, 219 parts of sodium silicate, and 10 parts of PE fiber.

[0021] Example 1

[0022] The geopolymer mix ratio is as follows:

[0023] Table 1

[0024] slag Fly ash Silica Fume No. 9 sand Barium chloride Sodium hydroxide Sodium silicate water 338 225 77 192 6 20 219 90

[0025] Preparation method

[0026] Step 1: first dissolve the sodium hydroxide solid and mix it with the sodium silicate solution to form an alkaline excitation solution;

[0027] Step 2: First, put slag, fly ash, silica fume and No. 9 sand into a mortar planetary mixer and stir at low speed for 3 minutes;

[0028] Step 3: Slowly pour the alkaline excitation solution, stir at low speed for 2 minutes, and then stir at high speed for 1 minute.

[0029] The above steps are followed to obtain a geopolymer-based mortar.

[0030] Example 2

[0031] The foaming polymer formula is as follows:

[0032] Table 2

[0033] slag Fly ash Silica Fume No. 9 sand Barium chloride Sodium hydroxide Sodium silicate Styrene acrylic emulsion water 338 225 77 192 6 20 219 26 90

[0034] Preparation method

[0035] Step 1: first dissolve the sodium hydroxide solid and mix it with the sodium silicate solution to form an alkaline excitation solution;

[0036] Step 2: First, put slag, fly ash, silica fume and No. 9 sand into a mortar planetary mixer and stir at low speed for 3 minutes;

[0037] Step 3: Slowly pour the alkali-activated solution and styrene-acrylic emulsion, stir at low speed for 2 minutes, and then stir at high speed for 1 minute.

[0038] The above steps are followed to obtain the foamed geopolymer-based mortar.

[0039] Example 3

[0040] The foaming polymer formula is as follows:

[0041] Table 3

[0042] slag Fly ash Silica Fume No. 9 sand Barium chloride Sodium hydroxide Sodium silicate Styrene acrylic emulsion water PE fiber 338 225 77 192 6 20 219 26 90 10

[0043] Preparation method

[0044] Step 1: first dissolve the sodium hydroxide solid and mix it with the sodium silicate solution to form an alkaline excitation solution;

[0045] Step 2: First, put slag, fly ash, silica fume and No. 9 sand into a mortar planetary mixer and stir at low speed for 3 minutes;

[0046] Step 3: Slowly pour the alkali-activated solution and styrene-acrylic emulsion into the mixture, stirring at low speed for 2 minutes, and then stirring at high speed for 1 minute;

[0047] Step 4: Sprinkle the fibers evenly within 2 minutes, and then stir at high speed for 1 minute.

[0048] The above steps are followed to obtain the foamed EGC material.

[0049] For the specimens formed according to the above-mentioned mix ratio, preparation method and curing system, the compressive strength, tensile strength and tensile strain at 28 days of age were measured with reference to the requirements of the Japan Society of Civil Engineers (JSCE) and the provisions of the ASTM C109-16 standard. The test results are shown in Tables 4 and 5.

[0050] Table 4: Compressive strength test results

[0051]

[0052] Table 5: Tensile strength test results

[0053] Example 1 Example 2 Example 3 Tensile strength / MPa 3.67 1.34 3.25 Tensile strain / % 0.01 0.05 4.6

[0054] As shown in Tables 4-5 above, the 28d compressive strength of the foamed EGC material prepared by the present invention in Example 3 is 31.34 MPa, and the tensile strength is 3.25 MPa; by comparison, it can be seen that the tensile strain of the foamed EGC material prepared by the present invention (Example 3) is significantly improved compared with the ordinary geopolymer mortar and the foamed geopolymer mortar. Therefore, the foamed EGC material prepared by the present invention has good physical properties.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A foamed EGC material, characterized in that: The invention comprises the following components: slag, fly ash, silica fume, No. 9 sand, barium chloride, styrene-acrylic emulsion, water, sodium hydroxide, sodium silicate and PE fiber. The slag, fly ash and silica fume constitute a cementitious material, and the mixing ratio of each component is designed as follows: by mass fraction: slag: 338 parts, fly ash: 225 parts, silica fume: 77 parts, No. 9 sand: 192 parts, barium chloride: 6 parts, styrene-acrylic emulsion: 26 parts, water: 90 parts, sodium hydroxide: 20 parts, sodium silicate: 219 parts and PE fiber: 10 parts.

2. A foamed EGC material according to claim 1, characterized in that: The slag is blast furnace S105 slag.

3. The foamed EGC material according to claim 1, characterized in that: The fly ash is Class F fly ash.

4. The foamed EGC material according to claim 1, characterized in that: The No. 9 sand has a particle size of about 76um-150um and a density of 2.65g / cm 3 of quartz sand.

5. The foamed EGC material according to claim 1, characterized in that: The PE fiber is an ultra-high molecular weight polyethylene fiber, with a single fiber length of 12 mm and a diameter of 24 μm.

6. The specific steps are as follows: A method for preparing a foamed EGC material comprises the following steps: Step 1: first dissolve the sodium hydroxide solid and mix it with the sodium silicate solution to form an alkaline excitation solution; Step 2: First, put slag, fly ash, silica fume and No. 9 sand into a mortar planetary mixer and stir at low speed for 3 minutes; Step 3: Slowly pour the alkali-activated solution and styrene-acrylic emulsion into the mixture, stir at low speed for 2 minutes, then at high speed for 1 minute. Step 4: Sprinkle the fibers evenly within 2 minutes, and then stir at high speed for 1 minute to obtain the foamed EGC material.

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