CN112830811A - Light high-strength geopolymer material and preparation method thereof - Google Patents
Light high-strength geopolymer material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- C04B2111/40—Porous or lightweight materials
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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Abstract
The invention discloses a light high-strength geopolymer material and a preparation method thereof, wherein the geopolymer material comprises the following components: the concrete foaming agent comprises ground coal gangue powder, regenerated ground powder, superfine metakaolin, silica fume, high-strength gypsum powder, a concrete expanding agent, basalt fiber, steel fiber, water glass, caustic alkali, carboxylic styrene-butadiene latex, a combined foaming agent, a defoaming agent and a water reducing agent. The light high-strength geopolymer material provided by the invention effectively utilizes industrial waste residues and old building wastes; the sound absorption, sound insulation, noise reduction, anti-settling and other properties, and the application range is wide; the preparation method of the light-weight high-strength geopolymer material provided by the invention has simple operation steps and does not need high-temperature forming maintenance.
Description
Technical Field
The invention relates to a geopolymer and a preparation method thereof, in particular to a light high-strength geopolymer material and a preparation method thereof.
Background
The coal gangue is one of the solid wastes with the largest discharge amount in China, so that the problems of environmental pollution and large land occupation are urgently solved; the old building is dismantled to produce a large amount of inorganic non-metallic wastes such as waste concrete, bricks, mortar, glass, porcelain blocks and the like, and the reasonable resource recycling of the inorganic non-metallic wastes meets the national policy of sustainable development.
The light weight, high strength and good durability are the development directions of most building materials, and the uneven settlement of roadbeds, road surfaces and bridges and the generation of cracks are caused due to the self-weight of partial buildings, road structures and large-span bridges; the light polymer is a novel energy-saving environment-friendly material, has the characteristic of light dead weight, and has the defects of low strength, poor toughness, poor integrity, large contractibility and the like.
Disclosure of Invention
The invention aims to provide a light-weight high-strength geopolymer material and a preparation method thereof, which can reduce the dead weight and shrinkage of the geopolymer material and improve the strength, toughness and durability of the geopolymer material.
The technical scheme adopted by the invention for solving the technical problems is to provide a light high-strength geopolymer material, which comprises the following components: the concrete foaming agent comprises ground coal gangue powder, regenerated ground powder, superfine metakaolin, silica fume, high-strength gypsum powder, a concrete expanding agent, basalt fiber, steel fiber, water glass, caustic alkali, carboxylic styrene-butadiene latex, a combined foaming agent, a defoaming agent and a water reducing agent.
The invention also provides a preparation method of the light high-strength geopolymer material, which comprises the following steps: (1) putting the ground coal gangue powder, the regenerated ground powder, the superfine metakaolin, the silica fume, the high-strength gypsum powder, the concrete expanding agent, the basalt fiber, the steel fiber, the defoaming agent and the water reducing agent into a mortar stirrer according to preset weight parts, and stirring for 3-5min to be uniform at the rotating speed of 300 plus materials of 500r/min to obtain a geopolymer dry blend; (2) firstly, 1/4 of the total mixing water consumption is weighed and added into a 500ml or 1000ml plastic beaker, then the carboxylic styrene-butadiene latex and the combined foaming agent are added into the beaker according to the preset weight parts, and the carboxylic styrene-butadiene latex and the combined foaming agent in the water are stirred for 2-3min by using a hand-held small-sized stirrer at the rotating speed of 5000-; (3) 3/4 of the total mixing water consumption is added into the geopolymer dry mixture prepared in the step (1), the rotating speed of a stirrer is kept at 200-700r/min, the mixture is continuously stirred for 1min, water glass and caustic alkali with preset weight parts are added while stirring, the stirring is continuously carried out for 1-2min, the mode of defoaming firstly and then guiding bubbles is adopted, the generation of harmful large bubbles in the mixture is inhibited by utilizing a defoaming agent, then the foam mixed solution prepared in the step (2) is added, the stirring is continuously carried out for 1-2min until the uniform stirring is carried out, and finally the light high-strength geopolymer slurry is obtained.
Further, the components are mixed according to the following parts by weight:
further, the ground coal gangue powder is prepared by crushing coal gangue waste through a crusher, high-temperature activation at 600-1000 ℃ and grinding through a grinding machine, and the specific surface area is 600-1000m2/kg。
Further, the regenerated grinding powder is prepared by crushing construction waste, activating at the high temperature of 800 ℃, grinding and screening at the temperature of 600-2/kg。
Furthermore, the combined foaming agent is prepared by compounding 50-70% of animal protein foaming agent, 20-40% of sodium dodecyl sulfate, 5-10% of xanthan gum and 2-5% of maltodextrin, and has the defoaming time of 2-4h, the foaming times of 20-40 times, the 2h settlement distance of 0-5mm and the bubble diameter of 0.001-1 mm.
Further, the high-strength gypsum powder is beta-type semi-hydrated gypsum and is prepared by calcining dihydrate gypsum at the high temperature of 150-300 ℃, the screen residue of a square-hole screen with the fineness of 0.3mm is less than 1%, the breaking strength for 2h is more than 5Mpa, and the compressive strength for 2h is more than 10 Mpa.
Furthermore, the superfine metakaolin has the fineness of 2000-5000 meshes and is prepared by dehydrating and grinding metakaolin at the high temperature of 800-1000 ℃.
Furthermore, the basalt fiber is formed by melting at the high temperature of 1000-1500 ℃ and drawing at high speed, the length is 3-9mm, the monofilament diameter is 10-500 mu m, and the elastic modulus is more than 100 Gpa.
Further, the carboxylic styrene-butadiene latex is formed by modifying styrene-butadiene latex, and the effective solid content is 30-40%.
Compared with the prior art, the invention has the following beneficial effects: compared with the existing light material, the light high-strength geopolymer material and the preparation method thereof effectively utilize industrial waste residues and old building wastes in the aspect of resource recycling, are a circular economy mode of sustainable development, and effectively relieve the dilemma of shortage of per capita resources in China; in the aspect of material performance, the material has the characteristics of light dead weight, high strength, good toughness and the like, has the performances of sound absorption, sound insulation, noise reduction, settlement prevention and the like, and has a wide application range, such as: high fill embankment, wall thermal insulation material, meeting room sound absorption and insulation decorative board, high-rise large-span building and the like.
The preparation method of the light-weight high-strength geopolymer material provided by the invention has simple operation steps and does not need high-temperature forming maintenance.
Detailed Description
The present invention will be further described with reference to the following examples.
The light-weight high-strength geopolymer material comprises the following components in parts by weight:
the specific surface area of the ground coal gangue powder is 600-1000m2/kg, main chemical component is Al2O3、SiO2And TiO2Etc.; the coal gangue waste is prepared by the processes of crushing by a crusher, activating at a high temperature of over 600 ℃, grinding by a grinding machine and the like. Preferably 600-1000 ℃, and when the activation temperature exceeds 1000 ℃ or is less than 600 ℃, the activity of the ground coal gangue powder is poor.
The regenerated grinding powder is prepared by crushing building wastes, activating at high temperature of 800 ℃, grinding and screening at 600-00-500m2And/kg, the construction waste mainly refers to inorganic non-metal waste such as waste concrete, bricks, mortar, glass, porcelain blocks and the like in old city reconstruction.
The fineness of the superfine metakaolin is 2000-5000 meshes, and the main chemical component of the superfine metakaolin is Al2O3And SiO2The product has the best activity and the fastest alkali activation reaction rate, and is prepared by dehydrating and grinding metakaolin at the high temperature of 800-1000 ℃.
The fineness of the silica fume is 1000-1250 meshes, and the 28d activity index is more than 95 percent.
The high-strength gypsum powder is beta-type semi-hydrated gypsum and is prepared by calcining dihydrate gypsum at the high temperature of 150-300 ℃, the screen residue of a square-hole sieve with the fineness of 0.3mm is less than 1 percent, the 2-hour flexural strength is more than 5Mpa, and the 2-hour compressive strength is more than 10 Mpa.
The concrete expanding agent has a specific surface area of more than 300m2/kg, a 1.18mm sieve residue of less than 0.2%, a 7d limited expansion rate of more than 0.025% in water, and the main components of the concrete expanding agent are calcium oxide and calcium sulphoaluminate.
The basalt fiber is formed by melting at a high temperature of more than 1000 ℃ and drawing at a high speed, the length is 3-9mm, the diameter of a monofilament is 10-500 mu m, and the elastic modulus is more than 100 Gpa; the steel fiber is copper-plated steel fiber, the length is 6-8mm, the monofilament diameter is 100-200 mu m, and the elastic modulus is more than 30 GPa. The basalt fiber and the steel fiber are controlled in a preferred range, when the mixing amount of the basalt fiber exceeds 2 percent and the mixing amount of the steel fiber exceeds 1.5 percent, the dispersibility of the basalt fiber and the steel fiber is poor, and the mechanical property of the material is adversely affected, such as: poor fluidity, low strength, etc.
The water glass is sodium water glass or potassium water glass, the modulus is 1-2, and the solid content is 30-60%.
The caustic alkali is sodium hydroxide or potassium hydroxide, and has analytical purity of more than 98%.
The carboxylic styrene-butadiene latex is milky white liquid and is formed by modifying styrene-butadiene latex, the effective solid content is 30-40%, the carboxylic styrene-butadiene latex has certain adhesive property and conjunctiva strength, and the toughness of the geopolymer material can be improved while the foam strength and elasticity are improved. The toughness of the geopolymer material is favorably improved by adding the carboxylic styrene-butadiene latex, but when the adding amount of the carboxylic styrene-butadiene latex exceeds 5 percent, the toughness is not obviously improved, and the compressive strength is sharply reduced; the effective solid content is 30-40%, when the solid content is more than 40%, the viscosity is slightly high, the dispersibility is poor, and when the solid content is less than 30%, the toughening effect on the geopolymer material is not obvious.
The combined foaming agent is prepared by compounding 50-70% of animal protein foaming agent, 20-40% of sodium dodecyl sulfate, 5-10% of xanthan gum and 2-5% of maltodextrin, the foam stability (defoaming time) is more than 4h, the foaming times are more than 40 times, the 2h settlement distance is not more than 5mm, and the diameter of bubbles is less than 1 mm; the foam formed by the combined foaming agent is micro spherical closed-cell bubbles, and has the characteristics of high stability, difficulty in cracking, uniformity, compactness, acid and alkali resistance, high foam strength and the like at the ambient temperature of 20-30 ℃. The mixing amount of the combined foaming agent is preferably controlled between 0.1 and 2 percent, and when the mixing amount is less than 0.1 percent, the strength is improved, but the self weight of the geopolymer is great; when the amount is more than 2%, the amount of the introduced bubbles is large, the porosity of the geopolymer material becomes large, and the strength becomes remarkably low. Through repeated experiments, the defoaming time is preferably 2-4h, the foaming times are 20-40 times, the 2h settling distance is 0-5mm, and the bubble diameter is 0.001-1 mm; the defoaming time of a common foaming agent is within 2 hours, and some foaming agents are even less than 30min, the foaming agent modified by combination and compounding has the characteristics of long defoaming time, large foaming times and the like, the good stability and compactness of bubbles are ensured, and the improvement of the comprehensive performance of a light geopolymer material is facilitated, such as: better fluidity, higher mechanical strength, larger sound absorption coefficient and the like. The foaming agent with too short defoaming time can easily break bubbles in the geopolymer material and is not easy to form compact, uniform and benign pores.
The defoaming agent is a polyether defoaming agent, the purity of the defoaming agent is more than 98%, and the defoaming agent mainly plays a role in inhibiting the generation of bubbles and eliminating harmful uneven large bubbles. The mixing amount of the defoaming agent is preferably controlled to be 0.01-1%, and beneficial and fine benign bubbles can be eliminated when the mixing amount is more than 1%.
The water reducing agent is a polycarboxylic acid high-performance water reducing agent, is powdery, and has a water content of less than 1% and a water reducing rate of 25-40%.
The invention also provides a preparation method of the light high-strength geopolymer material, which comprises the following steps:
(1) 20-60 parts of ground coal gangue powder, 5-30 parts of recycled ground powder, 5-25 parts of superfine metakaolin, 2.5-8 parts of silica fume, 2-15 parts of high-strength gypsum powder, 5-15 parts of concrete expanding agent, 0.1-2 parts of basalt fiber, 0.1-1.5 parts of steel fiber, 0.01-1 part of defoaming agent and 0.4-1 part of water reducing agent are put into a mortar mixer and are mixed for 3-5min to be uniform at the rotating speed of 300 plus materials of 500r/min to obtain the geopolymer dry mixed material.
(2) Firstly, 1/4 (the water temperature is 20-30 ℃) of the total mixing water consumption is weighed and added into a 500ml or 1000ml plastic beaker, then 0.1-5 parts of carboxylic styrene-butadiene latex and 0.1-2 parts of combined foaming agent are added into the beaker, a hand-held small mixer is used for stirring the carboxylic styrene-butadiene latex and the combined foaming agent in the water for 2-3min at the rotating speed of 5000-8000r/min, and finally, stable, fine and uniform foam mixed liquid is obtained.
(3) 3/4 of the total mixing water consumption is added into the dry geopolymer mixture prepared in the step (1), the rotating speed of a stirrer is kept at 200-700r/min, the mixture is stirred for 1min, 5-25 parts of water glass and 5-20 parts of caustic alkali are added while stirring, the stirring is continued for 1-2min, the mode of defoaming firstly and then introducing bubbles is adopted, the defoaming agent is utilized to inhibit the generation of harmful large bubbles (the diameter is more than 1mm) in the mixture, then the foam mixed solution prepared in the step (2) is added, the dense, fine, closed and beneficial bubbles are introduced, the stirring is continued for 1-2min to be uniform, and finally the light high-strength geopolymer slurry is obtained.
(4) Pouring the light-weight high-strength geopolymer slurry prepared in the step (3) into a test mold, immediately putting into a curing box or a curing room with the temperature being more than 20 ℃ and the relative humidity being more than 95% Rh for curing and forming; and demolding after 1d, and continuously curing for at least 28d in a curing box or a curing room with the temperature being more than 20 ℃ and the relative humidity being more than 95 percent Rh.
(5) Steps (1) - (4) were all performed under laboratory conditions with a temperature of 22 + -2 deg.C and a relative humidity of greater than 65% Rh.
The water-to-gel ratio of the light-weight high-strength geopolymer material is 0.20-0.30, and after the slurry is added into the foam solution, the stirring time is not too long, preferably controlled within 2min, so as to prevent adverse effects on the stability of bubbles; when the geopolymer slurry is discharged, the net slurry fluidity is more than 160mm, and no bleeding and segregation phenomena exist.
Example 1:
the embodiment provides a light high-strength geopolymer material, which comprises the following components in parts by weight: 41.4 parts of ground coal gangue powder, 5 parts of regenerated grinding powder, 20 parts of superfine metakaolin, 2.5 parts of silica fume, 5 parts of high-strength gypsum powder, 5 parts of concrete expanding agent, 0.2 part of basalt fiber, 0.1 part of steel fiber, 0.1 part of defoaming agent, 0.5 part of polycarboxylic acid water reducing agent, 0.1 part of carboxylic styrene-butadiene latex, 0.1 part of combined foaming agent, 15 parts of sodium silicate, 5 parts of sodium hydroxide and the like.
The embodiment provides a light-weight high-strength geopolymer material, and the preparation method comprises the following steps:
(1) putting 41.4 parts of ground coal gangue powder, 5 parts of regenerated ground powder, 20 parts of superfine metakaolin, 2.5 parts of silica fume, 5 parts of high-strength gypsum powder, 5 parts of concrete expanding agent, 0.2 part of basalt fiber, 0.1 part of steel fiber, 0.1 part of defoaming agent and 0.5 part of polycarboxylic acid water reducing agent into a mortar mixer, and stirring for 3-5min to be uniform at the rotating speed of 300 plus materials of 500r/min to obtain the geopolymer dry blend.
(2) Firstly, 1/4 (the water-gel ratio is 0.29, the water temperature is 20-30 ℃) of the total mixing water consumption is weighed and added into a 500ml or 1000ml plastic beaker, then 0.1 part of carboxylic styrene-butadiene latex and 0.1 part of combined foaming agent are added into the beaker, a hand-held small-sized stirrer is used for stirring the carboxylic styrene-butadiene latex and the combined foaming agent in the water for 2-3min at the rotating speed of 5000 plus 8000r/min, and finally, stable, fine and uniform foam mixed solution is obtained.
(3) 3/4 (water-to-gel ratio is 0.29) of the total mixing water consumption is added into the geopolymer dry mixture prepared in the step (1), the rotating speed of a stirrer is kept at 200-700r/min, the mixture is stirred for 1min, 15 parts of sodium water glass and 5 parts of sodium hydroxide are added while stirring, the stirring is continued for 1-2min, the mode of defoaming firstly and then foam guiding is adopted, the defoaming agent is utilized to inhibit the generation of harmful large bubbles (the diameter is more than 1mm) in the mixture, then the foam solution prepared in the step (2) is added, dense, fine, closed and beneficial bubbles are introduced, the stirring is continued for 1-2min to be uniform, and finally the light high-strength geopolymer slurry is obtained.
(4) Pouring the light-weight high-strength geopolymer slurry prepared in the step (3) into a test mold, immediately putting into a curing box or a curing room with the temperature being more than 20 ℃ and the humidity being more than 95% Rh for curing and forming; and demolding after 1d, and continuously curing for at least 28d in a curing box or a curing room with the temperature being more than 20 ℃ and the humidity being more than 95% Rh.
(5) Steps (1) - (4) were all performed under laboratory conditions with a temperature of 22. + -. 2 ℃ and a humidity of greater than 65% Rh.
Example 2:
the embodiment provides a light high-strength geopolymer material, which comprises the following components in parts by weight: 37.4 parts of ground coal gangue powder, 15 parts of regenerated ground powder, 10 parts of superfine metakaolin, 2.5 parts of silica fume, 5 parts of high-strength gypsum powder, 7 parts of concrete expanding agent, 0.3 part of basalt fiber, 0.2 part of steel fiber, 0.1 part of defoaming agent, 0.5 part of polycarboxylic acid water reducing agent, 1.2 parts of carboxylic styrene-butadiene latex, 0.8 part of combined foaming agent, 15 parts of sodium silicate, 5 parts of sodium hydroxide and the like.
The embodiment provides a light-weight high-strength geopolymer material, and the preparation method comprises the following steps:
(1) putting 37.4 parts of ground coal gangue powder, 15 parts of regenerated ground powder, 10 parts of superfine metakaolin, 2.5 parts of silica fume, 5 parts of high-strength gypsum powder, 7 parts of concrete expanding agent, 0.3 part of basalt fiber, 0.2 part of steel fiber, 0.1 part of defoaming agent and 0.5 part of polycarboxylic acid water reducing agent into a mortar mixer, and stirring for 3-5min to be uniform at the rotating speed of 300 plus materials of 500r/min to obtain the geopolymer dry blend.
(2) Firstly, 1/4 (the water-gel ratio is 0.29, the water temperature is 20-30 ℃) of the total mixing water consumption is weighed and added into a 500ml or 1000ml plastic beaker, then 1.2 parts of carboxylic styrene-butadiene latex and 0.8 part of combined foaming agent are added into the beaker, a hand-held small-sized stirrer is used for stirring the carboxylic styrene-butadiene latex and the combined foaming agent in the water for 2-3min at the rotating speed of 5000 plus 8000r/min, and finally, stable, fine and uniform foam mixed solution is obtained.
(3) 3/4 (water-to-gel ratio is 0.29) of the total mixing water consumption is added into the geopolymer dry mixture prepared in the step (1), the rotating speed of a stirrer is kept at 200-700r/min, the mixture is stirred for 1min, 15 parts of sodium water glass and 5 parts of sodium hydroxide are added while stirring, the stirring is continued for 1-2min, the mode of defoaming firstly and then foam guiding is adopted, the defoaming agent is utilized to inhibit the generation of harmful large bubbles (the diameter is more than 1mm) in the mixture, then the foam solution prepared in the step (2) is added, dense, fine, closed and beneficial bubbles are introduced, the stirring is continued for 1-2min to be uniform, and finally the light high-strength geopolymer slurry is obtained.
(4) Pouring the light-weight high-strength geopolymer slurry prepared in the step (3) into a test mold, immediately putting into a curing box or a curing room with the temperature being more than 20 ℃ and the humidity being more than 95% Rh for curing and forming; and demolding after 1d, and continuously curing for at least 28d in a curing box or a curing room with the temperature being more than 20 ℃ and the humidity being more than 95% Rh.
(5) Steps (1) - (4) were all performed under laboratory conditions with a temperature of 22. + -. 2 ℃ and a humidity of greater than 65% Rh.
Example 3:
the embodiment provides a light high-strength geopolymer material, which comprises the following components in parts by weight: 20.8 parts of ground coal gangue powder, 5 parts of regenerated grinding powder, 25 parts of superfine metakaolin, 2.5 parts of silica fume, 10 parts of high-strength gypsum powder, 7 parts of concrete expanding agent, 0.3 part of basalt fiber, 0.3 part of steel fiber, 0.1 part of defoaming agent, 0.5 part of polycarboxylic acid water reducing agent, 2 parts of carboxylic styrene-butadiene latex, 1.5 parts of combined foaming agent, 20 parts of sodium silicate, 5 parts of sodium hydroxide and the like.
The embodiment provides a light-weight high-strength geopolymer material, and the preparation method comprises the following steps:
(1) 20.8 parts of ground coal gangue powder, 5 parts of regenerated ground powder, 25 parts of superfine metakaolin, 2.5 parts of silica fume, 10 parts of high-strength gypsum powder, 7 parts of concrete expanding agent, 0.3 part of basalt fiber, 0.3 part of steel fiber, 0.1 part of defoaming agent and 0.5 part of polycarboxylic acid water reducing agent are put into a mortar mixer and are mixed for 3-5min to be uniform at the rotating speed of 300 plus materials of 500r/min to obtain the geopolymer dry mixed material.
(2) Firstly, 1/4 (the water-gel ratio is 0.29, the water temperature is 20-30 ℃) of the total mixing water consumption is weighed and added into a 500ml or 1000ml plastic beaker, then 2 parts of carboxylic styrene-butadiene latex and 1.5 parts of combined foaming agent are added into the beaker, a hand-held small-sized stirrer is used for stirring the carboxylic styrene-butadiene latex and the combined foaming agent in the water for 2-3min at the rotating speed of 5000 plus 8000r/min, and finally, a stable, fine and uniform foam mixed solution is obtained.
(3) 3/4 (water-to-gel ratio is 0.29) of the total mixing water consumption is added into the geopolymer dry mixture prepared in the step (1), the rotating speed of a stirrer is kept at 200-700r/min, the mixture is stirred for 1min, 20 parts of sodium water glass and 5 parts of sodium hydroxide are added while stirring, the stirring is continued for 1-2min, the mode of defoaming firstly and then foam guiding is adopted, the defoaming agent is utilized to inhibit the generation of harmful large bubbles (the diameter is more than 1mm) in the mixture, then the foam solution prepared in the step (2) is added, dense, fine, closed and beneficial bubbles are introduced, the stirring is continued for 1-2min to be uniform, and finally the light high-strength geopolymer slurry is obtained.
(4) Pouring the light-weight high-strength geopolymer slurry prepared in the step (3) into a test mold, immediately putting into a curing box or a curing room with the temperature being more than 20 ℃ and the humidity being more than 95% Rh for curing and forming; and demolding after 1d, and continuously curing for at least 28d in a curing box or a curing room with the temperature being more than 20 ℃ and the humidity being more than 95% Rh.
(5) Steps (1) - (4) were all performed under laboratory conditions with a temperature of 22. + -. 2 ℃ and a humidity of greater than 65% Rh.
Reference standard GB/T11969-2008 autoclaved aerated concrete performance test method, JC/T266-2011 foam concrete, GB/T18696.1-2004 acoustic impedance tube acoustic absorption coefficient and acoustic impedance measurement part 1: the properties of dry density, compressive strength, flexural strength, sound absorption coefficient, thermal conductivity, dry shrinkage value and the like of examples 1 to 3 were tested by the standing wave ratio method and GB/T11968-.
Although the present invention has been described with respect to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A light-weight high-strength geopolymer material is characterized by comprising the following components: the concrete foaming agent comprises ground coal gangue powder, regenerated ground powder, superfine metakaolin, silica fume, high-strength gypsum powder, a concrete expanding agent, basalt fiber, steel fiber, water glass, caustic alkali, carboxylic styrene-butadiene latex, a combined foaming agent, a defoaming agent and a water reducing agent.
2. The light-weight high-strength geopolymer material as claimed in claim 1, wherein the components are as follows in parts by weight:
3. the light-weight high-strength geopolymer material as claimed in claim 1, wherein the ground gangue powder is prepared from gangue waste through crushing by a crusher, high-temperature activation at 600-1000 ℃ and pulverizing by a pulverizer, and has a specific surface area of 600-1000m2/kg。
4. The light-weight high-strength geopolymer material as claimed in claim 1, wherein the regenerated grinding powder is prepared from construction waste through the processes of crushing, high-temperature activation at 800 ℃ of 600-2/kg。
5. The light-weight high-strength geopolymer material as claimed in claim 1, wherein the combined foaming agent is prepared by compounding 50-70% of animal protein foaming agent, 20-40% of sodium dodecyl sulfate, 5-10% of xanthan gum and 2-5% of maltodextrin, the defoaming time is 2-4h, the foaming multiple is 20-40 times, the 2h settling distance is 0-5mm, and the diameter of the bubbles is 0.001-1 mm.
6. The light-weight high-strength geopolymer material as claimed in claim 1, wherein said high-strength gypsum powder is beta-hemihydrate gypsum, which is obtained by calcining dihydrate gypsum at a high temperature of 150-300 ℃, and has a fineness of 0.3mm and a square-hole sieve residue of less than 1%, a 2h flexural strength of more than 5Mpa and a 2h compressive strength of more than 10 Mpa.
7. The light-weight high-strength geopolymer material as claimed in claim 1, wherein the ultrafine metakaolin has a fineness of 2000-5000 mesh and is prepared by dehydrating and grinding metakaolin at a high temperature of 800-1000 ℃.
8. The light-weight high-strength geopolymer material as claimed in claim 1, wherein said basalt fiber is melted at a high temperature of 1000-1500 ℃ and drawn at a high speed, and has a length of 3-9mm, a monofilament diameter of 10-500 μm, and an elastic modulus of more than 100 Gpa.
9. The light-weight, high-strength geopolymer material according to claim 1, wherein said carboxylated styrene-butadiene latex is modified from styrene-butadiene latex and has an effective solid content of 30-40%.
10. A method for preparing a light-weight, high-strength geopolymer material according to any one of claims 1 to 9, characterized in that it comprises the following steps:
(1) putting the ground coal gangue powder, the regenerated ground powder, the superfine metakaolin, the silica fume, the high-strength gypsum powder, the concrete expanding agent, the basalt fiber, the steel fiber, the defoaming agent and the water reducing agent into a mortar stirrer according to preset weight parts, and stirring for 3-5min to be uniform at the rotating speed of 300 plus materials of 500r/min to obtain a geopolymer dry blend;
(2) firstly, 1/4 of the total mixing water consumption is weighed and added into a 500ml or 1000ml plastic beaker, then the carboxylic styrene-butadiene latex and the combined foaming agent are added into the beaker according to the preset weight parts, and the carboxylic styrene-butadiene latex and the combined foaming agent in the water are stirred for 2-3min by using a hand-held small-sized stirrer at the rotating speed of 5000-;
(3) 3/4 of the total mixing water consumption is added into the geopolymer dry mixture prepared in the step (1), the rotating speed of a stirrer is kept at 200-700r/min, the mixture is continuously stirred for 1min, water glass and caustic alkali with preset weight parts are added while stirring, the stirring is continuously carried out for 1-2min, the mode of defoaming firstly and then guiding bubbles is adopted, the generation of harmful large bubbles in the mixture is inhibited by utilizing a defoaming agent, then the foam mixed solution prepared in the step (2) is added, the stirring is continuously carried out for 1-2min until the uniform stirring is carried out, and finally the light high-strength geopolymer slurry is obtained.
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