CN111548104A - Low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement - Google Patents
Low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement, which is prepared by stirring, spraying and compacting the following components in parts by weight: 30-50 parts of high belite sulphoaluminate cement, 5-20 parts of quartz sand, 20-50 parts of waste concrete recycled aggregate, 8-15 parts of water, 0.1-2 parts of water reducing agent, 0.1-1 part of thickening time control agent, 3-10 parts of emulsion, 0.005-0.1 part of defoaming agent, 0.005-0.1 part of organic silicon and 1-10 parts of alkali-resistant glass fiber. The invention adopts high belite sulphoaluminate cement with the characteristics of quick setting and hardening and high strength in both early and later periods to replace Portland cement and sulphoaluminate cement which are commonly used by GRC as a glue material, and C-S-H gel produced by later-period hydration reaction is used for filling capillary pores, so that the passage of water entering GRC is reduced; the composite organic silicon water repellent further improves the compactness and the hydrophobicity of the GRC matrix to reduce the water absorption of the regenerated GRC.
Description
Technical Field
The invention relates to a cement-based composite material, in particular to a regenerated glass fiber reinforced cement material which is prepared by utilizing high belite sulphoaluminate cement and has high strength, low water absorption and good carbonization resistance and a preparation method thereof, belonging to the technical field of building materials.
Background
The glass fiber reinforced cement (GRC) as a fiber concrete composite material has high water absorption (the water absorption specified by the GRC decorative product industry standard is not more than 14-16%). The common aggregate of GRC is quartz sand, and the water absorption rate is about 1 percent. The regenerative GRC is different from the traditional GRC, wherein the natural aggregate quartz sand is replaced by construction waste regenerative aggregate, a large amount of regenerative aggregate contains a large amount of pores and microcracks, the crushing index is poor, the water absorption rate is high and reaches more than 8%, and after the regenerative aggregate with high water absorption rate is used for replacing the quartz sand with low water absorption rate, the water absorption rate of the regenerative GRC is further increased, which is very unfavorable for the durability of the GRC. Therefore, the problem of solving the water absorption rate of the recycled GRC is the key technical bottleneck problem of applying the recycled aggregate to the GRC decorative product.
Currently, portland cement, sulphoaluminate cement and belite sulphoaluminate cement are mainly used when preparing glass fibre reinforced cement: portland cement, mineral composition: tricalcium silicate (50-70%), dicalcium silicate (5-20%) and an aluminum/iron phase; the mechanical property is characterized in that: the early strength is low, and the later strength is high; and (3) stripping time: the maintenance time is long, and the turnover of the template is slow. Sulphoaluminate cement, mineral composition: anhydrous calcium sulphoaluminate (more than 70 percent) and a small amount of dicalcium silicate (less than 10 percent); the mechanical property is characterized in that:the early strength is high, the later strength is not obviously increased or is reversely shrunk, and the anti-carbonization capability is poor; and (3) stripping time: the curing time is short, and the turnover of the template is fast. The belite sulphoaluminate cement comprises the following minerals: anhydrous calcium sulfoaluminate (C)4A3S: 30% -40%) and belite (C)2S: 35% -45%); the mechanical property is characterized in that: the early strength is high, the later strength is continuously increased, and the anti-carbonization capacity is high; and (3) stripping time: the curing time is short, and the turnover of the template is fast.
The invention adopts the dual technical measures of high belite sulphoaluminate cement and organosilicon water repellent to produce the regenerated GRC with low water absorption, and provides a method for preparing a regenerated GRC material with high strength, low water absorption and good carbonization resistance by using the high belite sulphoaluminate cement and organosilicon.
Disclosure of Invention
The invention aims to solve the technical problem of high water absorption of a regenerated GRC material, and provides a method for preparing a low-water-absorption regenerated GRC material by using a high belite sulphoaluminate cement and organosilicon double-compaction technology plus an organosilicon surface hydrophobic water-blocking technology. When the waste concrete recycled aggregate with the water absorption of more than 8 percent is adopted to replace more than 50 percent of natural quartz sand, the waste concrete recycled aggregate passes through C of the high belite sulphoaluminate cement2The water absorption of the regenerated GRC is controlled to be not more than 3% by the CSH gel formed in the later stage and the organic silicon hydrophobic and hydrophobic technology, and the technical bottleneck of high water absorption when the high-water-absorption solid waste is used for preparing the glass fiber reinforced cement material is broken through. The low-water-absorption regenerated glass fiber reinforced cement material prepared by the method has excellent performance indexes which are superior to those of the glass fiber reinforced cement materials on the market: the recycled aggregate is replaced by more than 50 percent, the initial fluidity of the slurry is more than 350mm, the fluidity loss after 30min is less than 10 +/-5 mm, the gas content of the slurry is less than 5.0 percent, the 1-day compressive strength is more than 22 MPa/the bending strength is more than 8MPa, the 3-day compressive strength is more than 38 MPa/the bending strength is more than 17MPa, the 28-day compressive strength is more than 57 MPa/the bending strength is more than 24MPa, the 28-day carbonization depth is less than 10mm, and the water absorption rate is less than 3.0 percent. The water absorption rate of the cement is not reached by the raw glass fiber reinforced cement material in the current industry standard and is reduced from no more than 14 percent toNot more than 3 percent and reduced by more than 4 times.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement, which is prepared by stirring, spraying and compacting the following components in parts by weight: 30-50 parts of high belite sulphoaluminate cement, 5-20 parts of quartz sand, 20-50 parts of waste concrete recycled aggregate, 8-15 parts of water, 0.1-2 parts of water reducing agent, 0.1-1 part of coagulation regulator, 3-10 parts of emulsion, 0.005-0.1 part of defoaming agent, 0.005-0.1 part of organic silicon and 1-10 parts of alkali-resistant glass fiber.
In the technical scheme, the high belite sulphoaluminate cement is a mixture formed by mixing any one or more than two of high belite sulphoaluminate cement, anti-crack quick-setting and quick-hardening high belite sulphoaluminate cement, high-strength quick-setting and quick-hardening high belite sulphoaluminate cement and white anti-crack double-quick high belite sulphoaluminate cement in any proportion; preferably 42.5 grade anti-cracking double-fast high belite sulphoaluminate cement, wherein the anhydrous calcium sulphoaluminate (C)4A3S) is 30-40 percent and belite (C)2S) is 35 to 45 percent.
In the technical scheme, the quartz sand is a particle formed by crushing and processing natural quartz stone, and the main mineral component is SiO2The grain diameter is 0.01 mm-2 mm, and the grain size is continuous gradation.
In the technical scheme, the waste concrete recycled aggregate is formed by crushing and processing waste concrete generated by the removal of an existing building, the particle size is 0.01-2 mm, the aggregate is continuously graded, the mud content is less than 2% (by mass), and the water absorption rate is more than 8%.
In the technical scheme, the water reducing agent is a mixture formed by mixing any one or more than two of a naphthalene water reducing agent, an aminosulfonic acid water reducing agent, a melamine water reducing agent and a polycarboxylic acid high-performance water reducing agent in any proportion; preferably, the polycarboxylic acid high-performance water reducing agent has the solid content of less than 25 percent and the water reducing rate of more than 20 percent.
In the technical scheme, the coagulation regulator is an inorganic and/or organic substance capable of regulating the cement coagulation time, and specifically is a mixture formed by mixing any one or more than two of lignosulfonate, citric acid, metaphosphate, boric acid, glucose and tartrate in any proportion; boric acid is preferred.
In the above technical scheme, the emulsion is a mixture formed by mixing any one or more than two of vinyl acetate-ethylene copolymer emulsion (EVA emulsion), vinyl acetate-acrylate copolymer emulsion (vinyl acetate-acrylic emulsion), vinyl acetate-vinyl chloride-acrylic copolymer emulsion, pure acrylic copolymer emulsion (acrylic emulsion), styrene-acrylate copolymer emulsion (styrene-acrylic emulsion), and butadiene-styrene copolymer emulsion (styrene-butadiene emulsion) in any proportion; preferably an aqueous styrene-acrylic emulsion.
In the technical scheme, the defoaming agent is a mixture formed by mixing any one or more than two of mineral oil, alcohols, fatty acid and fatty acid esters, amides, phosphates, silicones, polyethers and polyether modified polysiloxane defoaming agents in any proportion; preferably, the defoaming agent is polyether modified polysiloxane defoaming agent, the main component is Si-C type polyether modified polysiloxane, and the pH value is 5-8.
In the technical scheme, the organic silicon is a mixture formed by mixing any one or more than two of microcapsule-coated silicon resin, silane emulsion, nonionic silane-based emulsion and aqueous thixotropic paste silane in any proportion, preferably the nonionic silane-based emulsion, the main component of the organic silicon is isobutyl triethoxysilane, the active component is 3-10%, and the pH value is 5-9.
In the technical scheme, the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the alkali-resistant glass fiber is 5-40 μm, and the length of the fiber is 5-40 mm.
The invention also provides a preparation method of the low-water-absorption regenerative GRC material prepared from the high belite sulphoaluminate cement, which comprises the following steps:
(1) stirring the quartz sand, the waste concrete recycled aggregate and the cement in the proportion for 1 minute in a stirrer at the speed of 30-40r/min in a dry state to obtain a dry mixture A of the recycled GRC material for later use;
(2) adding the coagulation regulator, the defoaming agent and the organic silicon in the proportion into the water in the proportion to form a mixture B, adding the mixture B, the emulsion and the water reducing agent in the proportion into a stirrer, and stirring the mixture B and the dry mixture A together for 2 minutes at a speed of 50-60r/min to obtain newly-stirred regenerated GRC slurry C;
(3) and (3) loading the stirred fresh regenerated GRC slurry C obtained in the step (2) into a jet machine trough, and simultaneously spraying and molding the slurry and the alkali-resistant glass fiber in proportion to obtain the low-water-absorption regenerated GRC material prepared from the high belite sulphoaluminate cement.
The clinker product of the high belite sulphoaluminate cement used in the invention is mainly anhydrous calcium sulphoaluminate (C)4A3S: 30% -40%) and belite (C)2S: 35% -45%), the anhydrous calcium sulphoaluminate can quickly react with water and gypsum to release hydration heat, thereby providing early strength of cement and accelerating the turnover of the template; belite C2The S can continuously and slowly react with water in the later hydration period for years to generate calcium silicate hydrate phase C-S-H gel, so that the strength in the later hydration period can be promoted to be continuously increased, the continuously generated calcium silicate hydrate C-S-H gel can fill capillary pores of GRC to play a role in compacting, and a channel for water to enter the GRC and recycled aggregate is blocked, so that the water absorption of the GRC is reduced. The GRC prepared by the high belite sulphoaluminate cement has the characteristics of high early strength and high later strength, not only retains the characteristics of early strength of the sulphoaluminate cement, but also absorbs the characteristic of continuous increase of later strength of the portland cement. Meanwhile, the anti-carbonization capability of the sulphoaluminate cement is poorer than that of belite sulphoaluminate cement, the 28-day carbonization depth of the sulphoaluminate cement is 12-20 mm, and the 28-day carbonization depth of the high belite sulphoaluminate cement is about 9-10 mm, which is just because of the double-high characteristic of high belite sulphoaluminate cement clinker minerals, anhydrous calcium sulphoaluminate generates ettringite hydration products with slightly expanded volume, CH (hydration products easy to carbonize) is consumed, the density of a matrix structure is increased, and simultaneously, the addition of the hydrated product is addedThe hydration of the subelite is beneficial to the strength development of the matrix and the improvement of the structural density.
The invention adopts organosilicon hydrophobic technology to modify the surface of the regenerated GRC material. Most of the siloxane and silane in the silicone are very small molecules that can penetrate very deeply and uniformly distributed in the GRC material structure, plugging and filling the GRC capillary pores. Meanwhile, the hydrophobicity of the organic silicon can form a hydrophobic protective layer on the surface layer of the GRC material, so that liquid water is prevented from entering the interior of the GRC, and the chance that the recycled aggregate with high water absorption rate contacts a large amount of water is avoided.
The invention adopts the high belite sulphoaluminate cement to prepare the regenerated GRC, which not only can ensure that the regenerated GRC has the characteristics of high early strength and timely form removal, but also most importantly utilizes C2More C-S-H gel in the later stage of S fills and blocks capillary pores of GRC, so that the compactness of GRC is improved, and the opportunity of water entering GRC and recycled aggregate is reduced. Meanwhile, the compactness of GRC and the hydrophobicity of the organic silicon material are further improved by utilizing the secondary permeability of the organic silicon material, and the moisture is further prevented from entering the GRC material and the recycled aggregate. Namely 'double dense water blocking' + surface hydrophobic water blocking technology, and multiple water blocking technology ensures that the regenerated GRC has low water absorption.
The invention mainly adopts high belite sulphoaluminate cement with the characteristics of quick setting and hardening and high strength in both early and later periods to replace Portland cement and sulphoaluminate cement which are commonly used by GRC as a glue material, and C-S-H gel produced by later-period hydration reaction is used for filling capillary pores, so that the passage of water entering the GRC is reduced; the composite organic silicon water repellent further improves the compactness and the hydrophobicity of the GRC matrix to reduce the water absorption of the regenerated GRC. The low-water-absorption regenerated GRC material prepared by adopting the high belite sulphoaluminate cement and the organic silicon hydrophobic technology achieves the following effects:
(1) the recycled aggregate is replaced by more than 50 percent, the initial fluidity of the slurry is more than 350mm, the fluidity loss after 30min is less than 10 +/-5 mm, and the gas content of the slurry is less than 5.0 percent;
(2) the recycled aggregate has water absorption rate of more than 8 percent, under the condition that the amount of the substituted quartz sand is not less than 50 percent, the compressive strength is more than 22 MPa/the bending strength is more than 8MPa in 1 day, the compressive strength is more than 38 MPa/the bending strength is more than 17MPa in 3 days, the compressive strength is more than 57 MPa/the bending strength is more than 24MPa in 28 days, the carbonization depth is less than 10mm in 28 days, the water absorption rate is less than 3.0 percent in 28 days, compared with the traditional GRC decorative product, the water absorption rate specified in the industry standard is not more than 14-16 percent and is reduced to be less than 3 percent, and the effect.
In conclusion, the low-water-absorption regenerated GRC material prepared by the high belite sulphoaluminate cement has excellent performance indexes, and meanwhile, the construction solid waste is recycled, so that the waste is turned into treasure, and the natural environment is protected.
Drawings
FIG. 1 is a schematic view of the present invention for reducing water absorption; wherein R represents a hydrophobic group.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but the present invention is not limited to the following descriptions:
the invention will now be illustrated with reference to specific examples:
example 1:
a low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement comprises the following components in percentage by weight: high belite sulphoaluminate cement: quartz sand: waste concrete recycled aggregate: water: water reducing agent: and (3) setting control agent: emulsion: defoaming agent: organosilicon: the weight ratio of the alkali-resistant glass fiber is 38.72: 15.49: 23.23: 11.08: 0.94: 0.77: 4.65: 0.04: 0.05: 5.03; wherein:
the high belite sulphoaluminate cement is 42.5-grade anti-cracking double-fast high belite sulphoaluminate cement and anhydrous calcium sulphoaluminate C4A3S: 37.43% belite C2S：39.85％；
The quartz sand is a particle formed by crushing natural quartz stone, and the main mineral component is SiO2The grain diameter is 0.01 mm-2.0 mm, and the continuous gradation is carried out;
the waste concrete recycled aggregate is particles formed by crushing and processing waste concrete generated by the removal of an existing building, the particle size is 0.01-1.5 mm, the continuous gradation is realized, the fineness modulus is 2.8, the mud content is 0.8 percent (by mass), and the water absorption rate is 9.3 percent;
the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content is 13.3 percent, and the water reducing rate is 28.3 percent;
the coagulation regulator is boric acid;
the emulsion is water-based styrene-acrylic emulsion;
the defoaming agent is polyether modified polysiloxane defoaming agent, the main component is Si-C type polyether modified polysiloxane, and the pH value is 7.8;
the organic silicon is nonionic silane-based emulsion, the main component of the organic silicon is isobutyl triethoxysilane, the active component of the organic silicon is 5 percent, and the pH value of the organic silicon is 7.5;
the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the fiber is 15 μm, and the length of the fiber is 20 mm.
Is prepared by the following method:
(1) stirring quartz sand, waste concrete recycled aggregate and cement in a dry state in a stirrer at the speed of 35r/min for 1 minute to obtain a dry mixture A of a recycled GRC material for later use;
(2) adding a coagulation regulator, a defoaming agent and organic silicon into water to form a mixture B, adding the mixture B, an emulsion and a water reducing agent into a stirrer, and stirring the mixture B, the emulsion and the water reducing agent together with the dry mixture A at a speed of 55r/min for 2 minutes to obtain fresh mixed slurry C, wherein the slurry C is the slurry of the fresh mixed regenerated glass fiber reinforced cement material, the initial fluidity of the slurry is 350mm, the fluidity loss after 30min is 10mm, and the gas content of the slurry is 4.5%;
(3) and (3) loading the stirred fresh regenerated GRC slurry C obtained in the step (2) into a material groove of a spraying machine, and simultaneously spraying and molding the slurry and the alkali-resistant glass fiber to obtain the low-water-absorption regenerated glass fiber reinforced cement material prepared from the belite sulphoaluminate cement.
The obtained regenerated GRC material is cured in a standard curing room, the 1-day compressive strength is 22.4 MPa/bending strength is 8.6MPa, the 3-day compressive strength is 38.8 MPa/bending strength is 17.5MPa, the 28-day compressive strength is 58.5 MPa/bending strength is 24.3MPa, the 28-day carbonization depth is 8mm, and the water absorption rate is 1.7%.
Example 2:
a low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement comprises the following components in percentage by weight: high belite sulphoaluminate cement: quartz sand: waste concrete recycled aggregate: water: water reducing agent: and (3) setting control agent: emulsion: defoaming agent: organosilicon: the weight ratio of the alkali-resistant glass fiber is 39.22: 7.84: 31.38: 11.23: 0.91: 0.24: 4.71: 0.04: 0.05: 4.40; wherein:
the high belite sulphoaluminate cement is 42.5-grade anti-cracking double-fast high belite sulphoaluminate cement and anhydrous calcium sulphoaluminate C4A3S: 35.27% belite C2S：42.26％；
The quartz sand is a particle formed by crushing natural quartz stone, and the main mineral component is SiO2The grain diameter is 0.01 mm-1.0 mm, and the continuous gradation is carried out;
the waste concrete recycled aggregate is particles formed by crushing and processing waste concrete generated by the removal of an existing building, the particle size is 0.01-1.0 mm, the continuous gradation is realized, the fineness modulus is 2.6, the mud content is 0.5 percent (by mass), and the water absorption rate is 8.8 percent;
the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content is 15.6 percent, and the water reducing rate is 26.6 percent;
the coagulation regulator is boric acid;
the emulsion is water-based styrene-acrylic emulsion;
the defoaming agent is polyether modified polysiloxane defoaming agent, the main component is Si-C type polyether modified polysiloxane, and the pH value is 6.8;
the organic silicon is nonionic silane-based emulsion, the main component of the organic silicon is isobutyl triethoxysilane, the active component is 7 percent, and the pH value is 7.2;
the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the fiber diameter was 12 μm and the fiber length was 18 mm.
Is prepared by the following method:
(1) stirring quartz sand, waste concrete recycled aggregate and cement in a dry state in a stirrer at a speed of 32r/min for 1 minute to obtain a dry mixture A of a recycled GRC material for later use;
(2) adding a coagulation regulator, a defoaming agent and organic silicon into water to form a mixture B, adding the mixture B, an emulsion and a water reducing agent into a stirrer, and stirring the mixture B, the emulsion and the water reducing agent together with the dry mixture A at a speed of 57r/min for 2 minutes to obtain fresh mixed slurry C, wherein the slurry C is a slurry of a fresh mixed regenerated glass fiber reinforced cement material, the initial fluidity of the slurry is 360mm, the fluidity loss after 30min is 8mm, and the gas content of the slurry is 4.4%.
(3) And (3) loading the stirred fresh regenerated GRC slurry C obtained in the step (2) into a material groove of a spraying machine, and simultaneously spraying and molding the slurry and the alkali-resistant glass fiber to obtain the low-water-absorption regenerated glass fiber reinforced cement material prepared from the belite sulphoaluminate cement.
The obtained regenerated GRC material is cured in a standard curing room, the 1-day compressive strength is 22.8 MPa/bending strength is 8.3MPa, the 3-day compressive strength is 38.5 MPa/bending strength is 17.2MPa, the 28-day compressive strength is 57.9 MPa/bending strength is 24.8MPa, the 28-day carbonization depth is 6mm, and the water absorption rate is 2.5 percent.
Example 3:
a low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement comprises the following components in percentage by weight: high belite sulphoaluminate cement: quartz sand: waste concrete recycled aggregate: water: water reducing agent: and (3) setting control agent: emulsion: defoaming agent: organosilicon: the weight ratio of the alkali-resistant glass fiber is 38.16: 15.26: 22.90: 10.92: 0.99: 0.23: 6.87: 0.04: 0.05: 4.58; wherein:
the high belite sulphoaluminate cement is 42.5-grade anti-cracking double-fast high belite sulphoaluminate cement and anhydrous calcium sulphoaluminate C4A3S: 34.94% belite C2S：41.55％；
The quartz sand is a particle formed by crushing natural quartz stone, and the main mineral component is SiO2The grain diameter is 0.01 mm-1.5 mm, and the continuous gradation is carried out;
the waste concrete recycled aggregate is particles formed by crushing and processing waste concrete generated by the removal of an existing building, the particle size is 0.01-1.5 mm, the continuous gradation is realized, the fineness modulus is 2.7, the mud content is 1.0 percent (by mass), and the water absorption rate is 10.1 percent;
the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the solid content is 14.6 percent, and the water reducing rate is 27.4 percent;
the coagulation regulator is boric acid;
the emulsion is water-based styrene-acrylic emulsion;
the defoaming agent is polyether modified polysiloxane defoaming agent, the main component is Si-C type polyether modified polysiloxane, and the pH value is 7.2;
the organic silicon is nonionic silane-based emulsion, the main component of the organic silicon is isobutyl triethoxysilane, the active component is 4 percent, and the pH value is 6.6;
the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the fiber diameter was 13 μm and the fiber length was 24 mm.
Is prepared by the following method:
(1) stirring quartz sand, waste concrete recycled aggregate and cement in a dry state in a stirrer at the speed of 37r/min for 1 minute to obtain dry mixture A of the recycled GRC material for later use;
(2) adding a coagulation regulator, a defoaming agent and organic silicon into water to form a mixture B, adding the mixture B, an emulsion and a water reducing agent into a stirrer, and stirring the mixture B, the emulsion and the water reducing agent together with the dry mixture A at a speed of 52r/min for 2 minutes to obtain fresh slurry C, wherein the fresh slurry C is slurry of a fresh mixed regenerated glass fiber reinforced cement material, the initial fluidity of the slurry is 370mm, the fluidity loss after 30min is 13mm, and the gas content of the slurry is 4.8%.
(3) And (3) loading the stirred fresh regenerated GRC slurry C obtained in the step (2) into a material groove of a spraying machine, and simultaneously spraying and molding the slurry and the alkali-resistant glass fiber to obtain the low-water-absorption regenerated glass fiber reinforced cement material prepared from the belite sulphoaluminate cement.
The obtained regenerated GRC material is cured in a standard curing room, the 1-day compressive strength is 22.2 MPa/bending strength is 8.1MPa, the 3-day compressive strength is 39.3 MPa/bending strength is 18.1MPa, the 28-day compressive strength is 57.5 MPa/bending strength is 25.4MPa, the 28-day carbonization depth is 4mm, and the water absorption rate is 2.0%.
The above examples are only for illustrating the technical concept and features of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A low-water-absorption regenerative GRC material prepared from high belite sulphoaluminate cement is characterized by being prepared by stirring, spraying and compacting the following components in parts by weight: 30-50 parts of high belite sulphoaluminate cement, 5-20 parts of quartz sand, 20-50 parts of waste concrete recycled aggregate, 8-15 parts of water, 0.1-2 parts of water reducing agent, 0.1-1 part of coagulation regulator, 3-10 parts of emulsion, 0.005-0.1 part of defoaming agent, 0.005-0.1 part of organic silicon and 1-10 parts of alkali-resistant glass fiber.
2. A low water absorption regenerative GRC material according to claim 1, characterized by: the high belite sulphoaluminate cement is a mixture formed by mixing any one or more than two of high belite sulphoaluminate cement, anti-crack quick-setting quick-hardening high belite sulphoaluminate cement, high-strength quick-setting quick-hardening high belite sulphoaluminate cement and white anti-crack double quick-hardening high belite sulphoaluminate cement in any proportion.
3. A low water absorption regenerative GRC material according to claim 1, characterized by: the quartz sand is a particle formed by crushing natural quartz stone, and the main mineral component is SiO2The grain diameter is 0.01 mm-2 mm, and the continuous gradation is carried out; the waste concrete recycled aggregate is formed by crushing and processing waste concrete generated by the removal of an existing building, the particle size is 0.01-2 mm, the aggregate is continuously graded, the mud content is less than 2% by mass, and the water absorption rate is more than 8%.
4. A low water absorption regenerative GRC material according to claim 1, characterized by: the water reducing agent is a mixture formed by mixing any one or more than two of a naphthalene water reducing agent, an aminosulfonic acid water reducing agent, a melamine water reducing agent and a polycarboxylic acid high-performance water reducing agent in any proportion.
5. A low water absorption regenerative GRC material according to claim 1, characterized by: the set control agent is an inorganic and/or organic substance capable of adjusting the setting time of the cement, and specifically is a mixture formed by mixing any one or more than two of lignosulfonate, citric acid, metaphosphate, boric acid, glucose and tartrate in any proportion.
6. A low water absorption regenerative GRC material according to claim 1, characterized by: the emulsion is a mixture formed by mixing any one or more than two of vinyl acetate-ethylene copolymer emulsion, vinyl acetate-acrylate copolymer emulsion, vinyl acetate-vinyl chloride-acrylic acid copolymer emulsion, pure acrylic acid copolymer emulsion, styrene-acrylate copolymer emulsion and butadiene-styrene copolymer emulsion in any proportion.
7. A low water absorption regenerative GRC material according to claim 1, characterized by: the defoaming agent is a mixture formed by mixing any one or more than two of mineral oil, alcohols, fatty acid and fatty acid esters, amides, phosphates, silicones, polyethers and polyether modified polysiloxane defoaming agents in any proportion.
8. A low water absorption regenerative GRC material according to claim 1, characterized by: the organic silicon is a mixture formed by mixing any one or more than two of microcapsule-coated silicon resin, silane emulsion, nonionic silane-based emulsion and aqueous thixotropic paste silane in any proportion.
9. A low water absorption regenerative GRC material according to claim 1, characterized by: the alkali-resistant glass fiber is alkali-resistant glass fiber roving; the diameter of the alkali-resistant glass fiber is 5-40 μm, and the length of the fiber is 5-40 mm.
10. A method of producing a low water absorption regenerative GRC material made from a high belite sulphoaluminate cement as claimed in any of claims 1 to 9, comprising the steps of:
(1) stirring the quartz sand, the waste concrete recycled aggregate and the cement in the proportion for 1 minute in a stirrer at the speed of 30-40r/min in a dry state to obtain a dry mixture A of the recycled GRC material for later use;
(2) adding the coagulation regulator, the defoaming agent and the organic silicon in the proportion into the water in the proportion to form a mixture B, adding the mixture B, the emulsion and the water reducing agent in the proportion into a stirrer, and stirring the mixture B and the dry mixture A together for 2 minutes at a speed of 50-60r/min to obtain newly-stirred regenerated GRC slurry C;
(3) and (3) loading the stirred fresh regenerated GRC slurry C obtained in the step (2) into a jet machine trough, and simultaneously spraying and molding the slurry and the alkali-resistant glass fiber in proportion to obtain the low-water-absorption regenerated GRC material prepared from the high belite sulphoaluminate cement.
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