CN115572118B - Low-slump-loss glass recycled fine aggregate concrete and preparation method thereof - Google Patents
Low-slump-loss glass recycled fine aggregate concrete and preparation method thereof Download PDFInfo
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- CN115572118B CN115572118B CN202110762023.6A CN202110762023A CN115572118B CN 115572118 B CN115572118 B CN 115572118B CN 202110762023 A CN202110762023 A CN 202110762023A CN 115572118 B CN115572118 B CN 115572118B
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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
- C04B28/04—Portland 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/22—Glass ; Devitrified glass
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of building materials, in particular to a low-slump-loss glass recycled fine aggregate concrete and a preparation method thereof. The concrete comprises the following raw materials: cement, glass regenerated fine aggregate, mixing water, broken stone, machine-made sand or natural sand, admixture and additive; the weight ratio of cement, glass regenerated fine aggregate, admixture and additive is (100-150): (100-150): (55-100): (3.1-5.0); the admixture comprises class F fly ash, slag powder and superfine fly ash; the additive comprises hyperbranched air entraining plasticizer, slump retaining type polycarboxylate water reducer, retarder and water. The concrete can effectively reduce the alkali-silicon reaction risk, simultaneously ensure the construction performance of the concrete, prepare the concrete with the expansion degree of 3 hours and the time loss of less than 30mm, and is beneficial to the recycling of waste glass and the popularization and application of the concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a low-slump-loss glass recycled fine aggregate concrete and a preparation method thereof.
Background
As a large country for glass production and use, 1800 tens of thousands of tons of glass become waste each year, the recycling rate is only 13% -15%, and a large amount of waste glass can only be abandoned and buried. The waste glass is crushed to be used as the regenerated fine aggregate, so that the influence on the urban environment at present can be relieved, the condition of shortage of sand at present can be relieved, and the method has important ecological environmental benefit, economic benefit and technical benefit and meets the sustainable development strategic requirements of building materials in China.
Glass is amorphous and contains a large amount of silicon and calcium, and theoretically has pozzolanic activity and can be used as a concrete admixture, but the application of the glass in concrete also brings the risk of alkali-silicon reaction (ASR), so that the concrete swells and cracks, and the durability of the concrete is affected. Therefore, it is very interesting how to reduce the damage to the concrete with the risk of alkali-silicon reaction (ASR) in the concrete with the application of glass frit.
The patent application number is CN201310575016.0, chinese invention patent with publication date of 2014, 02 month and 12 days discloses concrete doped with waste glass and resistant to chloride ion permeation, and the concrete comprises the following components: gel material, glass fine aggregate, natural sand, cobble, water and additive; the total mass comprises, in 100%: 10-30% of cementing material, 3-8% of glass fine aggregate, 25-40% of natural sand, 35-50% of stone, 5-15% of water, 70-85% of cementing material, 10-20% of glass micropowder and 5-10% of silica fume. The preparation method comprises the following steps: mixing glass micropowder prepared from waste glass with glass fine aggregate, cobble, cement and silica fume according to the proportion, and adding into a stirrer to be pre-stirred for more than 20s; adding the additive accounting for 0.5 to 1.5 percent of the mass of the weighed total rubber material and water into the pre-stirred material, and stirring for more than 120 seconds to prepare the concrete which is doped with waste glass and is resistant to chloride ion permeation, wherein the water-cement ratio is 0.38 to 0.55. The invention adds waste glass into concrete to reduce the diffusion property of chloride ions, thereby improving the durability of reinforced concrete.
The invention discloses a concrete doped with waste glass, which comprises 50 to 70 parts of cement, 10 to 30 parts of glass powder, 20 parts of fly ash, 0 to 100 parts of glass fine aggregate, 100 to 250 parts of natural sand, 200 parts of coarse aggregate and 1 to 2 parts of nano SiO, wherein the patent application number is CN202010499823.9 2 1 part of an additive and 40 parts of water. The invention uses SiO in glass powder 2 And nano SiO 2 Has pozzolanic effect, and is doped into cement-based material, nano SiO 2 Can be combined with Ca (OH) 2 The reaction generates additional C-S-H gel, and the nanoscale size can enable the gel to be filled in the pores of the cement-based material, so that the matrix is more compact, the mechanical property of the cement-based material is improved, and the obtained concrete has excellent mechanical property.
In the prior art, glass fine aggregate is used for concrete to replace part of machine-made sand or natural sand, and silica fume or nano SiO is doped 2 To inhibit the potential risk of alkali-silicon reactions, but silica fume and nano-SiO 2 Due to its very fine particlesThe diameter has extremely large specific surface area, the water demand is often large, the advantages of low water absorption rate and smooth surface of the glass fine aggregate can not be exerted, and the workability of concrete can be seriously affected, so that the pouring of the concrete is not facilitated.
Disclosure of Invention
To solve the above-mentioned problems in the background art: the waste glass used as a concrete admixture can bring alkali-silicon reaction (ASR) risk to expand and crack the concrete, and influence the durability of the concrete; and glass fine aggregate is used for concrete and silica fume or nano SiO2 is doped in the prior art to inhibit potential ASR, but the workability of the concrete is seriously affected, so that the pouring of the concrete is not facilitated. According to the invention, the grading of concrete is optimized by doping the recycled glass fine aggregate through the specific mineral admixture, and meanwhile, the admixture with a specific formula is added, so that the expansion degree 3h time loss of the low slump loss glass recycled fine aggregate concrete is less than 30mm, and the workability of the low slump loss glass recycled fine aggregate concrete can be ensured for a long time.
The invention provides a low slump loss glass recycled fine aggregate concrete, which comprises the following raw materials: cement, glass regenerated fine aggregate, mixing water, broken stone, machine-made sand or natural sand, admixture and additive; the weight ratio of the cement to the glass regenerated fine aggregate to the admixture to the additive is (100-150): (100-150): (55-100): (3.1-5.0); the admixture comprises F-class fly ash, slag powder and ultrafine fly ash, wherein the weight ratio of the F-class fly ash to the slag powder to the ultrafine fly ash is (3-5): (5-10): (3-5); the additive comprises a hyperbranched air entraining plasticizer, a slump retaining type polycarboxylate superplasticizer, a retarder and water, wherein the weight ratio of the hyperbranched air entraining plasticizer to the slump retaining type polycarboxylate superplasticizer to the retarder to the water is (15-25): (4-8): (1-3): (36-79).
Further, the material comprises the following raw materials in parts by weight: 200-300 parts of cement, 200-300 parts of glass regenerated fine aggregate, 150-180 parts of mixing water, 950-1200 parts of crushed stone, 500-600 parts of machine-made sand or natural sand, 110-200 parts of admixture and 6.2-10.0 parts of additive.
Further, the method comprises the steps of,the slag powder is S95 grade slag powder with specific surface area of 400-500 m 2 Slag powder with 28d activity greater than 95%; the class F fly ash is class F class II fly ash; the superfine fly ash has specific surface area of 2000-2400 m 2 Per kg, the water demand ratio is less than 85 percent, and the 28d strength activity index is more than 75 percent.
Further, the fineness modulus of the glass regenerated fine aggregate is 1.6-2.0; the particle size of the crushed stone is 5-20 mm in continuous grading; the fineness modulus of the machine-made sand or the natural sand is 2.6-3.0.
Further, the particle size of the glass regenerated fine aggregate is 0.150-2.36 mm.
Further, the weight ratio of cement, F-class fly ash, slag powder and superfine fly ash in the concrete is 1: (0.1-0.2): (0.2-0.5): (0.1-0.2).
Further, the water-cement ratio in the concrete is 0.30-0.60; the weight ratio of the machine-made sand or the natural sand to the glass regenerated fine aggregate is 1: (0.35-0.5).
Further, the retarder is at least one of hydroxycarboxylic acid and its salt retarder, phosphate retarder and saccharide retarder.
Further, the structural formula of the hyperbranched air entraining plasticizer is as follows:
wherein the molecular weight is 50000-100000, n ranges from 20-80, and m is greater than 0.
The invention also provides a preparation method of the low slump loss glass recycled fine aggregate concrete, which comprises the following preparation steps: s100, weighing the raw materials: mixing water, cement, machine-made sand or natural sand, glass regenerated fine aggregate, F-class fly ash, slag powder, superfine fly ash and an additive are weighed according to a certain weight part; s200, preparing the low slump loss glass recycled fine aggregate concrete: s210, mixing all broken stones, machine-made sand or natural sand, glass regenerated fine aggregate and mixing water and uniformly stirring; and S220, mixing all cement, F-class fly ash, slag powder, ultrafine fly ash and additives with the mixture prepared in the step S210 and uniformly stirring to obtain the glass recycled fine aggregate concrete with low slump loss.
Compared with the prior art, the invention has the following technical effects:
the low slump loss glass recycled fine aggregate concrete provided by the invention can effectively reduce the alkali-silicon reaction risk, simultaneously ensure the construction performance of the concrete, prepare the concrete with the expansion degree of 3 hours and the time loss of less than 30mm, is favorable for recycling waste glass and popularizing and applying the concrete, and has huge economic benefit and ecological environment benefit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in connection with the technical solutions in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a low slump loss glass recycled fine aggregate concrete, which comprises the following raw materials: cement, glass regenerated fine aggregate, mixing water, broken stone, machine-made sand or natural sand, admixture and additive; the weight ratio of the cement to the glass regenerated fine aggregate to the admixture to the additive is (100-150): (100-150): (55-100): (3.1-5.0); the admixture comprises F-class fly ash, slag powder and ultrafine fly ash, wherein the weight ratio of the F-class fly ash to the slag powder to the ultrafine fly ash is (3-5): (5-10): (3-5); the additive comprises a hyperbranched air entraining plasticizer, a slump retaining type polycarboxylate superplasticizer, a retarder and water, wherein the weight ratio of the hyperbranched air entraining plasticizer to the slump retaining type polycarboxylate superplasticizer to the retarder to the water is (15-25): (4-8): (1-3): (36-79).
According to the invention, the glass recycled fine aggregate is used as the aggregate, the characteristics of low water absorption and smooth surface of the glass fine aggregate are utilized, and the special additive combination obtained by compounding is added, so that the loss of concrete can be effectively controlled, and the construction performance of the concrete is guaranteed. And the admixture with specific types and proportions is mixed to perform combined action with the specially-made admixture obtained by compounding, so that the alkali in the concrete is consumed in advance, the alkali content in the concrete is reduced, the alkali-silicon reaction risk can be effectively reduced, and the waste glass is promoted to be recycled in the concrete. In summary, the invention adds the special compound admixture combination and the admixture with specific types and proportions into the concrete added with the glass regenerated fine aggregate, effectively reduces the alkali-silicon reaction risk, ensures that the expansion degree of the concrete is less than 30mm after 3h time loss, and can ensure the construction performance for a long time.
Preferably, the low slump loss glass recycled fine aggregate concrete comprises the following raw materials in parts by weight: 200-300 parts of cement, 200-300 parts of glass regenerated fine aggregate, 150-180 parts of mixing water, 950-1200 parts of crushed stone, 500-600 parts of machine-made sand or natural sand, 110-200 parts of admixture and 6.2-10.0 parts of additive.
Specifically, in the technical field, the class F fly ash is class F I-class III fly ash meeting the national standard requirements; the superfine fly ash is F-class coarse ash which is separated from a power plant and does not meet the I-III level requirements, and is obtained through grinding. In some embodiments, the superfine fly ash can be selected from F-class coarse ash with specific surface area of 2000-2400 m by grinding 2 Per kg of ultrafine fly ash.
Preferably, the class F fly ash is class F class II fly ash; the superfine fly ash has specific surface area of 2000-2400 m 2 Per kg, the water demand ratio is less than 85 percent, and the 28d strength activity index is more than 75 percent.
Preferably, the slag powder is S95 grade slag powder with specific surface area of 400-500 m 2 And/kg, 28d slag powder with activity greater than 95%.
Preferably, the cement is selected from P.O 42.5.42.5 Portland cement.
Preferably, the fineness modulus of the glass regenerated fine aggregate is 1.6-2.0; the particle size of the crushed stone is 5-20 mm in continuous grading; the fineness modulus of the machine-made sand or the natural sand is 2.6-3.0.
Preferably, the particle size of the glass recycled fine aggregate is 0.15-2.36 mm. The glass regeneration fine aggregate is prepared by crushing waste glass, sieving to remove particles with the particle size smaller than 0.150mm and the particle size larger than 2.36mm, wherein the shape of the oversized particles tends to be flat and slender, and the water demand of the oversized particles is higher, so that the fluidity of the concrete can be influenced.
Preferably, the hyperbranched bleed air plasticizer adopts a hyperbranched bleed air plasticizer shown in the following structural formula (I); the molecular weight is 50000-100000, n ranges from 20-80, and m is greater than 0.
The structural formula (I) is:
wherein the hyperbranched air entraining plasticizer is an air entraining polymer and has both water reducing and air entraining properties; the hyperbranched air entraining plasticizer is an existing hyperbranched air entraining polymer, and is prepared by a free radical copolymerization reaction of a monomer B, acrylic acid and a polyether macromonomer, wherein the monomer B is prepared by a reaction of a monomer A and glycerol, and the monomer A is prepared by a reaction of diethanolamine and fumaric acid.
The air-entraining polymer is a polyhydroxy macromolecular compound with a hyperbranched structure and has both water reducing and air-entraining properties; the foam has low surface tension, thus having better foaming capacity and higher bubble liquid film strength, generating fine and small bubbles in the concrete, reducing or eliminating alkali aggregate reaction expansion force brought by glass powder in the concrete, reducing alkali-silicon reaction (ASR) risk brought by glass powder application in the concrete, preventing the concrete from expanding and cracking due to the alkali-silicon reaction (ASR) risk, simultaneously, the stable fine and small bubbles also have a certain lubricating effect, reducing friction among aggregates and being beneficial to reducing expansion loss of the concrete.
Preferably, the slump-retaining polycarboxylate water reducer is a copolymer of acrylic acid and isopentenol polyoxyethylene ether.
The slump-retaining type polycarboxylate superplasticizer is the existing slump-retaining type polycarboxylate superplasticizer: copolymers of acrylic acid and isopentenol polyoxyethylene ether. The existing slump-retaining polycarboxylic acid water reducer such as the copolymer of acrylic acid and isopentenyl alcohol polyoxyethylene ether can continuously maintain the dispersion water reducing effect of cement particles and control slump loss. Preferably, the slump-retaining polycarboxylate water reducer can adopt Point-T slump-retaining polycarboxylate mother liquor produced by Jie New Material group Fujia Co., ltd. The mother solution is mainly a copolymer of acrylic acid and isopentenyl alcohol polyoxyethylene ether, and has the effect of dispersing and reducing water. In addition, the acrylic ester group is copolymerized on the main chain, and the branched chain can provide a steric hindrance effect, so that the branched chain can be slowly cut off in a high-alkalinity environment of cement hydration, thereby releasing polycarboxylic acid with a dispersing effect, further continuously maintaining the dispersing and water-reducing effect of cement particles, and controlling slump loss.
The retarder is at least one selected from hydroxycarboxylic acid and its salt retarder, phosphate retarder and saccharide retarder.
Wherein, the retarder controls the loss of concrete mainly by adjusting the setting time. The hydroxycarboxylic acid and its salt retarder may be, but is not limited to, one or more of sodium citrate, potassium tartrate, sodium gluconate, salicylic acid; the phosphate retarder can be, but is not limited to, one or more of sodium hexametaphosphate, sodium tripolyphosphate and sodium pyrophosphate; the sugar retarder may be, but is not limited to, one or more of glucose, sucrose, molasses. Preferably, the retarder is sodium gluconate.
Wherein, the hyperbranched air entraining plasticizer, retarder, slump retaining type polycarboxylate water reducer and water are mixed according to a certain weight ratio (15-25): (4-8): (1-3): the water reducing rate of the additive compounded in (36-79) is 20-25%.
Preferably, the weight ratio of cement, F-class fly ash, slag powder and superfine fly ash in the concrete is 1: (0.1-0.2): (0.2-0.5): (0.1-0.2). According to the specific raw material types of the composition admixture, the mineral admixture proportion within the specific proportion range is optimized, the pozzolanic property of the specific combination of the plurality of mineral admixtures is utilized, the alkali in the concrete is consumed in advance, the alkali content in the concrete is reduced, and the alkali aggregate reaction of the concrete can be effectively inhibited.
Preferably, the water-cement ratio in the concrete is 0.30-0.60; the weight ratio of the machine-made sand or the natural sand to the glass regenerated fine aggregate is 1: (0.35-0.5).
Preferably, the sand rate in the concrete is 40% -47%.
The invention also provides a preparation method of the low slump loss glass recycled fine aggregate concrete, which comprises the following preparation steps:
s100, weighing the raw materials: mixing water, cement, machine-made sand or natural sand, glass regenerated fine aggregate, F-class fly ash, slag powder, superfine fly ash and an additive are weighed according to a certain weight part; s200, preparing the low slump loss glass recycled fine aggregate concrete: s210, mixing all broken stones, machine-made sand or natural sand, glass regenerated fine aggregate and mixing water and uniformly stirring; and S220, mixing all cement, F-class fly ash, slag powder, ultrafine fly ash and additives with the mixture prepared in the step S210 and uniformly stirring to obtain the glass recycled fine aggregate concrete with low slump loss. In S210, all broken stone, machine-made sand or natural sand, glass regenerated fine aggregate and mixing water are mixed and stirred uniformly, so that the surface of the aggregate is fully soaked in the water for absorbing the water, and the slump loss of the concrete can be reduced.
In some embodiments, the method of preparing a low slump loss glass recycled fine aggregate concrete comprises the steps of: s100, weighing the raw materials: mixing water, cement, machine-made sand or natural sand, glass regenerated fine aggregate, F-class fly ash, slag powder, superfine fly ash and an additive are weighed according to a certain weight part; s200, preparing the low slump loss glass recycled fine aggregate concrete: s210, mixing all broken stone, machine-made sand or natural sand, glass regenerated fine aggregate and mixing water and stirring for 15-30S; s220, mixing all cement, F-class fly ash, slag powder, ultrafine fly ash and admixture with the mixture prepared in the S210, and stirring for 1-2 min to obtain the glass recycled fine aggregate concrete with low slump loss.
The invention also provides the following examples and comparative examples:
example 1
(1) Preparing the glass regenerated fine aggregate: crushing waste glass, and screening particles smaller than 0.150mm and larger than 2.36mm, wherein the fineness modulus is 1.8;
(2) Preparation of the admixture: according to the weight percentage, 20 percent of hyperbranched air entraining plasticizer, 6 percent of slump retaining type polycarboxylate water reducer, namely slump retaining type polycarboxylate mother liquor, 2 percent of sodium gluconate and the rest 72 percent of water are compounded, and the total additive water reducing rate after compounding is 23 percent;
(3) Weighing 250 parts of cement, 30 parts of F-class fly ash, 80 parts of slag powder, 30 parts of ultrafine fly ash, 165 parts of mixing water, 1030 parts of broken stone, 550 parts of machine-made sand, 230 parts of glass regenerated fine aggregate prepared in the step (1) and 7.0 parts of additive compounded in the step (2) according to parts by weight;
(4) Preparing low slump loss glass recycled fine aggregate concrete:
adding crushed stone, machine-made sand, glass regenerated fine aggregate and mixing water with the total mass, and stirring for 20s; and (3) adding the cement, the F-class fly ash, the slag powder, the superfine fly ash and the additive into the whole mass, and stirring for 1.5min to obtain the glass recycled fine aggregate concrete with low slump loss.
Wherein the cement is selected from P.O, 42.5 ordinary Portland cement; the class F fly ash is class F class II fly ash with fineness of 18%; the slag powder is S95 grade slag powder with specific surface area of 440m 2 3/kg, 28d slag powder with 98% activity; the superfine fly ash has a specific surface area of 2180m 2 Ultrafine fly ash with water demand ratio of 80% and 28d strength activity index of 78%; the particle size of the crushed stone is 5-20 mm for continuous grading; the fineness modulus of the machine-made sand is 2.8; the hyperbranched air entraining plasticizer adopts an air entraining polymer shown in a structural formula (I); slump retaining type polycarboxylic acid mother liquor separationPoint-T slump retaining polycarboxylic acid mother liquor produced by Ming New Material group Fu Jian Co., ltd.
It should be noted that the specific parameters and specific raw materials in the embodiments herein are specific embodiments or preferred embodiments under the concept of the present invention, and are not limiting; and can be adaptively adjusted by those skilled in the art within the concept and the protection scope of the invention.
Example 2
(1) Preparing the glass regenerated fine aggregate: crushing waste glass, and screening particles smaller than 0.150mm and larger than 2.36mm, wherein the fineness modulus is 1.8;
(2) Preparation of the admixture: according to the weight percentage, 25 percent of hyperbranched air entraining plasticizer, 4 percent of slump retaining type polycarboxylate water reducer, namely slump retaining type polycarboxylate mother liquor, 3 percent of sodium gluconate and the balance of 68 percent of water are compounded, and the total additive water reducing rate after compounding is 25 percent;
(3) Weighing 280 parts of cement, 45 parts of F-class fly ash, 80 parts of slag powder, 45 parts of ultrafine fly ash, 158 parts of mixing water, 1030 parts of broken stone, 500 parts of machine-made sand, 230 parts of glass regenerated fine aggregate prepared in the step (1) and 9.0 parts of additive compounded in the step (2) according to parts by weight;
(4) Preparing low slump loss glass recycled fine aggregate concrete:
adding crushed stone, machine-made sand, glass regenerated fine aggregate and mixing water with all the masses, and stirring for 25s; and (3) adding all the cement, the class F fly ash, the slag powder, the superfine fly ash and the admixture, and stirring for 2min to obtain the glass recycled fine aggregate concrete with low slump loss.
Wherein the cement is selected from P.O, 42.5 ordinary Portland cement; the class F fly ash is class F class I fly ash, and the fineness is 10%; the slag powder is S95 grade slag powder with a specific surface area of 417m 2 Kg), 28d slag powder with 96% activity; the superfine fly ash has a specific surface area of 2180m 2 Ultrafine fly ash with water demand ratio of 80% and 28d strength activity index of 78%; the particle size of the crushed stone is 5-20 mm for continuous grading; the fineness modulus of the machine-made sand is 2.8; the hyperbranched air entraining plasticizer adopts knotsA bleed air polymer of formula (I); the slump-retaining polycarboxylic acid mother liquor is selected from Point-T slump-retaining polycarboxylic acid mother liquor produced by Jie New Material group Fujia Co., ltd.
Example 3
(1) Preparing the glass regenerated fine aggregate: crushing waste glass, and screening particles smaller than 0.150mm and larger than 2.36mm, wherein the fineness modulus is 1.8;
(2) Preparation of the admixture: according to weight percentage, 17 percent of hyperbranched air entraining plasticizer, 8 percent of slump retaining type polycarboxylate water reducer, namely slump retaining type polycarboxylate mother liquor, 3 percent of sodium gluconate and the rest 72 percent of water are compounded, and the total additive water reducing rate after compounding is 25 percent;
(3) Weighing 200 parts of cement, 30 parts of F-class fly ash, 50 parts of slag powder, 30 parts of ultrafine fly ash, 175 parts of mixing water, 980 parts of broken stone, 600 parts of machine-made sand, 260 parts of glass regenerated fine aggregate prepared in the step (1) and 6.2 parts of additive compounded in the step (2) according to parts by weight;
(4) Preparing low slump loss glass recycled fine aggregate concrete:
adding crushed stone, machine-made sand, glass regenerated fine aggregate and mixing water with the total mass, and stirring for 20s; and (3) adding all the cement, the class F fly ash, the slag powder, the superfine fly ash and the admixture, and stirring for 1min to obtain the glass recycled fine aggregate concrete with low slump loss.
Wherein the cement is selected from P.O, 42.5 ordinary Portland cement; the class F fly ash is class F class II fly ash, and the fineness is 24%; the slag powder is S95 grade slag powder with specific surface area of 456m 2 Kg), 28d slag powder with 99% activity; the superfine fly ash has a specific surface area of 2180m 2 Ultrafine fly ash with water demand ratio of 80% and 28d strength activity index of 78%; the particle size of the crushed stone is 5-20 mm for continuous grading; the fineness modulus of the machine-made sand is 2.8; the hyperbranched air entraining plasticizer adopts an air entraining polymer shown in a structural formula (I); the slump-retaining polycarboxylic acid mother liquor is selected from Point-T slump-retaining polycarboxylic acid mother liquor produced by Jie New Material group Fujia Co., ltd.
Comparative examples 1 to 1
Based on example 1, the hyperbranched bleed-air plasticizer in the additive formulation was replaced with a general polycarboxylic acid water-reducing mother liquor, and the other conditions were the same as in example 1.
Wherein the polycarboxylic acid water-reducing mother solution is specifically an acrylic acid and methyl propenyl polyoxyethylene ether copolymer: point-TS3 polycarboxylic acid water-reducing mother liquor produced by Fujian Co., ltd.
Comparative examples 1 to 2
Based on example 1, the proportion of the slump retaining polycarboxylic acid mother liquor in the additive formulation was increased to 10%, and the remaining added water was reduced to 68%, under the same conditions as in example 1.
Comparative examples 1 to 3
Based on the example 1, the retarder sodium gluconate in the additive formulation was removed and the remaining added water increased to 74%; the other conditions were the same as in example 1.
Comparative example 2
Based on the embodiment 2, in the step (3), 280 parts of cement, 70 parts of class-F I fly ash, 30 parts of slag powder, 70 parts of superfine fly ash, 158 parts of mixing water, 1030 parts of crushed stone, 500 parts of machine-made sand, 230 parts of glass regenerated fine aggregate prepared in the step (1) and 9.0 parts of additive compounded in the step (2) are weighed; the other conditions were the same as in example 2.
Comparative example 3
On the basis of the embodiment 3, in the preparation process, in the step (4), not stepwise investment is adopted, but all broken stone, machine-made sand, glass recycled fine aggregate, mixing water, cement, class-F class-II fly ash, slag powder, superfine fly ash and additive are put into and stirred for 1min, so that the low slump loss glass recycled fine aggregate concrete is prepared. The other conditions were the same as in example 3.
The concrete prepared in examples and comparative examples were then subjected to performance tests, respectively, and the test results are shown in table 1:
table 1 test results
From the results in Table 1, it can be seen that: in examples 1-3, the expansion rate of 28d is lower, the compressive strength of 7d concrete and the compressive strength of 28d concrete are high, which shows that the risk of alkali-silicon reaction (ASR) caused by the application of the glass regenerated fine aggregate in the concrete can be reduced or eliminated, the concrete is prevented from expanding and cracking due to the risk of alkali-silicon reaction (ASR), and the concrete is high in strength and strong in durability; the expansion degree is less than 30mm after the time loss, the construction performance of the concrete can be guaranteed for a long time, and the waste glass recycling and the popularization and the application of the concrete are facilitated.
Compared with the embodiment, the expansion degree of the comparative example 1-1 is up to 120mm after 3h, and the expansion rate of 28d is up to 0.280%, which shows that the hyperbranched air entraining plasticizer used by the invention has low surface tension, thus having better foaming capacity and higher bubble liquid film strength, generating fine and small bubbles in concrete, playing a certain role in lubrication, reducing friction between aggregates, being beneficial to reducing expansion degree loss of concrete, and simultaneously reducing or eliminating alkali aggregate reaction expansion force brought by glass powder in the concrete; the 3h expansion degree of the hyperbranched air entraining plasticizer is tested in comparative examples 1-2, and segregation phenomenon is found to occur, which indicates that the preferable admixture compound formula is provided, the phenomenon of concrete bleeding segregation and the like can be caused by improper compound proportion, and the 28d expansion rate is higher, which indicates that the improper compound proportion, the air entraining and foam stabilizing effects of the hyperbranched air entraining plasticizer cannot be normally exerted; the expansion degree of the comparative examples 1-3 is as high as 150mm after 3h, which shows that the slump retaining effect of the additive cannot meet the requirement without retarder; the expansion degree of 3h of the comparative example 2 is less than 20mm, but the 28d expansion rate is higher and reaches 0.159%, which shows that the preferable mineral admixture proportion provided by the invention has higher alkali content in fly ash and superfine fly ash, and the excessively high mixing proportion of F-class fly ash and superfine fly ash can cause slower early hydration speed and can not quickly reduce the alkali content of concrete, thereby achieving the effect of inhibiting the alkali aggregate reaction of the concrete; the expansion degree of the comparative example 3 reaches 70mm after the time loss of 3h, which shows that the unique concrete preparation scheme provided by the invention can fully absorb water on the surface of the aggregate during mixing, prevent the aggregate from absorbing water from the cement paste after mixing, and effectively reduce the loss of concrete.
As can be seen from the test results in the table 1, the concrete prepared by the method has remarkable progress in the aspects of expansion loss and alkali-silicon reaction inhibition through the mutual coordination among specific additive combinations, proper admixture combinations and proportions and unique preparation methods.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The low slump loss glass recycled fine aggregate concrete is characterized by comprising the following raw materials: cement, glass regenerated fine aggregate, mixing water, broken stone, machine-made sand or natural sand, admixture and additive;
the weight ratio of the cement to the glass regenerated fine aggregate to the admixture to the additive is (100-150): (100-150): (55-100): (3.1-5.0);
the admixture comprises F-class fly ash, slag powder and ultrafine fly ash, wherein the weight ratio of the F-class fly ash to the slag powder to the ultrafine fly ash is (3-5): (5-10): (3-5);
the additive comprises a hyperbranched air entraining plasticizer, a slump retaining type polycarboxylate superplasticizer, a retarder and water, wherein the weight ratio of the hyperbranched air entraining plasticizer to the slump retaining type polycarboxylate superplasticizer to the retarder to the water is (15-25): (4-8): (1-3): (36-79);
200-300 parts of cement, 200-300 parts of glass regenerated fine aggregate, 150-180 parts of mixing water, 950-1200 parts of crushed stone, 500-600 parts of machine-made sand or natural sand, 110-200 parts of admixture and 6.2-10.0 parts of additive;
the retarder is at least one of hydroxycarboxylic acid and salt retarder, phosphate retarder and saccharide retarder; the class F fly ash is class F class II fly ash; the superfine fly ash is superfine fly ash with specific surface area of 2000-2400 m < 2 >/kg, water demand ratio of less than 85 percent and 28d strength activity index of more than 75 percent;
the structural formula of the hyperbranched air entraining plasticizer is as follows:
wherein the molecular weight is 50000-100000, n ranges from 20-80, and m is greater than 0.
2. The low slump loss glass recycled fine aggregate concrete according to claim 1, wherein: the slag powder is S95 grade slag powder with specific surface area of 400-500 m 2 And/kg, 28d slag powder with activity greater than 95%.
3. The low slump loss glass recycled fine aggregate concrete according to claim 1, wherein: the fineness modulus of the glass regenerated fine aggregate is 1.6-2.0;
the particle size of the crushed stone is 5-20 mm in continuous grading;
the fineness modulus of the machine-made sand or the natural sand is 2.6-3.0.
4. The low slump loss glass recycled fine aggregate concrete according to claim 1, wherein: the particle size of the glass regenerated fine aggregate is 0.15-2.36 mm.
5. The low slump loss glass recycled fine aggregate concrete according to claim 1, wherein: the weight ratio of cement to F-class fly ash to slag powder to superfine fly ash in the concrete is 1: (0.1-0.2): (0.2-0.5): (0.1-0.2).
6. The low slump loss glass recycled fine aggregate concrete according to claim 1, wherein: the water-cement ratio in the concrete is 0.30-0.60;
the weight ratio of the machine-made sand or the natural sand to the glass regenerated fine aggregate is 1: (0.35-0.5).
7. A method for preparing the low slump loss glass recycled fine aggregate concrete according to any one of claims 1 to 6, comprising the following steps:
s100, weighing the raw materials: mixing water, cement, machine-made sand or natural sand, glass regenerated fine aggregate, F-class fly ash, slag powder, superfine fly ash and an additive are weighed according to a certain weight part;
s200, preparing the low slump loss glass recycled fine aggregate concrete:
s210, mixing all broken stones, machine-made sand or natural sand, glass regenerated fine aggregate and mixing water and uniformly stirring;
and S220, mixing all cement, F-class fly ash, slag powder, ultrafine fly ash and additives with the mixture prepared in the step S210 and uniformly stirring to obtain the glass recycled fine aggregate concrete with low slump loss.
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