CN114315252B - Recycled geopolymer concrete and preparation method thereof - Google Patents
Recycled geopolymer concrete and preparation method thereof Download PDFInfo
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- CN114315252B CN114315252B CN202210004709.3A CN202210004709A CN114315252B CN 114315252 B CN114315252 B CN 114315252B CN 202210004709 A CN202210004709 A CN 202210004709A CN 114315252 B CN114315252 B CN 114315252B
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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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 belongs to the technical field of building materials, and discloses a recycled geopolymer concrete and a preparation method thereof. The recycled geopolymer concrete is prepared from the following raw materials: the recycled coarse aggregate is 180-1300 kg/m 3 (ii) a 200-1100 kg/m of recycled fine aggregate 3 (ii) a Rubber particles 0-500 kg/m 3 (ii) a Oil palm shell 0-800 kg/m 3 (ii) a 204-580 kg/m of cementing material 3 (ii) a 65-160 kg/m alkali activator 3 (ii) a 65-156 kg/m water 3 (ii) a 0-78 kg/m steel fiber 3 (ii) a Additive 2-5 kg/m 3 . The concrete of the invention makes full use of the characteristics and advantages of the recycled aggregate, the rubber particles, the steel fibers, the oil palm shells and other waste materials, so that the concrete material has higher mechanical property, working performance and economic and environmental protection values.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to recycled geopolymer concrete and a preparation method thereof.
Background
Cement, the most frequently used concrete cementing material at present, is produced by a process which is accompanied by a large energy consumption and a large amount of carbon dioxide emission. China is a big cement producing country, the cement yield occupies 53.84 percent of the global yield in 2020, and CO produced in the cement producing process 2 Reaches 12.3 hundred million tons and accounts for 83.11 percent of the industrial carbon emission of Chinese building materials. One of the main approaches for solving the problem of overhigh carbon emission in the production process of concrete at present is to realize secondary source by adopting a novel cementing material to replace cementThe head controls carbon emissions.
A large amount of industrial byproducts generated by thermal power generation, metal smelting and other industrial behaviors such as fly ash, silica fume and slag are easy to pollute soil and water if not treated properly, but the byproducts have the potential of replacing cement as a cementing material under the action of an alkaline or acidic activator, the activity of the powder such as the slag and the fly ash is improved by using the alkaline activator, and then the inorganic cementing material with a Si, al and O three-dimensional network bonding structure is formed by polymerization. Compared with common cement, geopolymer concrete has the advantages of low hydration heat, good frost resistance, strong corrosion resistance and the like. But Na in the conventional alkali activator 2 O·nSiO 2 The large amount of energy consumed in its production process, which undoubtedly increases the CO 2 And (4) discharging.
Concrete is now consuming natural aggregate at a rate of about 80 million tons per year as the largest consumer of natural resources such as water, sand, pebbles and crushed stones. Meanwhile, with the rapid development of urban construction, the improvement of physical life of people and the approach that the original buildings cannot meet the use requirements and the service life, more and more buildings are dismantled to generate more and more building wastes. The recycled aggregate produced after the construction waste treatment can be used as a substitute of natural aggregate, and the recycled aggregate can be used as the aggregate to produce lightweight concrete, so that the self weight of the structure can be reduced, and the economic and environment-friendly engineering construction can be realized. However, combining recycled aggregate with geopolymer cementitious materials results in much lower strength than ordinary concrete.
Therefore, how to use the recycled aggregate in geopolymer concrete and how to produce the green and environment-friendly concrete with low cost, high strength and good working performance has important significance for the development of the current building material industry.
Disclosure of Invention
The invention aims to provide a recycled geopolymer concrete and a preparation method thereof, and solves the problems that the existing geopolymer concrete still contains a large amount of cement, the concrete strength is low, and the working performance is poor.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a recycled geopolymer concrete which is prepared from the following raw materials in unit volume mass:
preferably, in the recycled geopolymer concrete, the recycled coarse aggregate has a particle size of 5 to 20mm, the recycled fine aggregate has a particle size of 0.08 to 5mm, and the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is 0.8 to 1.6:1.
preferably, in the recycled geopolymer concrete, the rubber particles have a particle size of 0.05 to 5mm and an apparent density of 1110 to 1150kg/m 3 。
Preferably, in the recycled geopolymer concrete, the particle size of the oil palm shells is 5-20 mm, and the apparent density of the oil palm shells is 1320-1380 kg/m 3 。
Preferably, in the recycled geopolymer concrete, the cementitious material is a mixture of slag, fly ash and silica fume, wherein the mass of the slag accounts for 25.5-70% of the total mass of the cementitious material, the mass of the fly ash accounts for 15-70% of the total mass of the cementitious material, and the mass of the silica fume accounts for 0-15% of the total mass of the cementitious material.
Preferably, in the recycled geopolymer concrete, the slag has a particle size of 7 to 10 μm, the fly ash has a particle size of 10 to 16 μm, and the silica fume has a particle size of 0.1 to 0.3 μm.
Preferably, in the recycled geopolymer concrete, the alkali-activator is prepared from 10-16 mol/L NaOH solution and nano SiO 2 Composition of NaOH and nano SiO in the NaOH solution 2 The mass ratio of (A) to (B) is 0.6-1.2: 1, the mass ratio of NaOH to a cementing material in the NaOH solution is 0.05-0.13: 1.
preferably, in the recycled geopolymer concrete, the steel fibers have a length of 0.1 to 15mm and a diameter of 0.16 to 0.2mm.
Preferably, in the recycled geopolymer concrete, the admixture comprises a retarder and a defoaming agent, wherein the retarder is BaCl 2 One or more of calcium sucrose and sodium gluconate.
The invention also provides a preparation method of the recycled geopolymer concrete, which comprises the following steps:
(1) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with part of water, adding the rubber particles and the cementing material, and stirring for 5-10 min to obtain a dry mixture;
(2) Dissolving the admixture in the residual water, adding the dry mixture, stirring for 1-3 min, adding the alkali activator, stirring for 3-5 min, adding the steel fiber, and stirring for 3-5 min to obtain concrete slurry;
(3) And forming and curing the concrete slurry to obtain the regenerated geopolymer concrete.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
(1) The recycled geopolymer concrete provided by the invention can fully utilize the characteristics and advantages of materials such as recycled aggregate, rubber particles, steel fibers, oil palm shells and the like, so that the concrete material has higher mechanical property, working performance and economic and environmental protection values.
(2) The invention uses the oil palm shells and the rubber particles to respectively partially replace the recycled coarse aggregate and the recycled fine aggregate, can reduce the environmental damage caused by river sand mining, and responds to the call of national green buildings.
(3) The alkali activator is obtained by mixing and reacting a high-concentration NaOH solution with nano silicon dioxide, and can reduce Na production 2 O·nSiO 2 The carbon emission is brought, and the green and environment-friendly advantages of geopolymer concrete are further improved.
(4) The admixture of the invention contains the defoaming agent, which can reduce the porosity in the concrete material and improve the strength of the concrete.
(5) The self weight of the recycled geopolymer concrete provided by the invention can be as low as 1800kg/m 3 The average compressive strength of 7d can reach 3 at mostMore than 1.58MPa, and the highest 28d average compressive strength can reach more than 40.97 MPa.
Detailed Description
The invention provides a recycled geopolymer concrete which is prepared from the following raw materials in unit volume mass:
in the present invention, the recycled geopolymer concrete is preferably prepared from raw materials comprising, by mass per unit volume: 500-1270 kg/m of recycled coarse aggregate 3 (ii) a 505-983 kg/m of recycled fine aggregate 3 (ii) a 12-489 kg/m of rubber particles 3 (ii) a 11-764 kg/m of oil palm shell 3 (ii) a 212-573 kg/m of cementing material 3 (ii) a 69-157 kg/m alkali activator 3 (ii) a 68-149 kg/m of water 3 (ii) a 28-76 kg/m of steel fiber 3 (ii) a Additive 2.5-4.3 kg/m 3 ；
Further preferably, the compound is prepared from the following raw materials: the recycled coarse aggregate 851-1130 kg/m 3 (ii) a 526 to 965kg/m of recycled fine aggregate 3 (ii) a 27-426 kg/m of rubber particles 3 (ii) a 54-704 kg/m of oil palm shells 3 (ii) a The cementing material is 246-553 kg/m 3 (ii) a 82-143 kg/m alkali activator 3 (ii) a 72-118 kg/m of water 3 (ii) a 36-71 kg/m steel fiber 3 (ii) a Additive 2.9-4.1 kg/m 3 ；
More preferably, the compound is prepared from the following raw materials: recycled coarse aggregate 953kg/m 3 (ii) a 683kg/m recycled fine aggregate 3 (ii) a Rubber particles 162kg/m 3 (ii) a 312kg/m oil palm shell 3 (ii) a Gel material 337kg/m 3 (ii) a 128kg/m alkali activator 3 (ii) a 95kg/m water 3 (ii) a 67kg/m steel fiber 3 (ii) a Additive 3.3kg/m 3 。
In the invention, the recycled coarse aggregate and the recycled fine aggregate are both obtained by crushing and screening waste concrete in construction waste preferably.
In the present invention, the recycled coarse aggregate preferably has a particle size of 5 to E20mm, more preferably 8 to 19mm, and still more preferably 15mm; the water absorption of the recycled coarse aggregate is preferably 1 to 7%, more preferably 2 to 6%, and still more preferably 5%; the apparent density of the recycled coarse aggregate is preferably 2400 to 2500kg/m 3 More preferably 2435 to 2497kg/m 3 More preferably 2462kg/m 3 。
In the present invention, the particle size of the recycled fine aggregate is preferably 0.08 to 5mm, more preferably 0.09 to 4.2mm, and still more preferably 3.4mm; the water absorption of the recycled fine aggregate is preferably 5 to 13%, more preferably 6 to 11%, and still more preferably 8%; the recycled fine aggregate preferably has an apparent density of 2150 to 2300kg/m 3 More preferably 2180 to 2270kg/m 3 More preferably 2253kg/m 3 。
In the present invention, the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is preferably 0.8 to 1.6:1, more preferably 0.9 to 1.5:1, more preferably 1.2:1.
in the present invention, the rubber particles are preferably obtained by mechanically crushing waste rubber tires.
In the present invention, the particle diameter of the rubber particles is preferably 0.05 to 5mm, more preferably 0.09 to 4.8mm, and still more preferably 4.2mm; the apparent density of the rubber particles is preferably 1110 to 1150kg/m 3 More preferably 1121 to 1147kg/m 3 More preferably 1132kg/m 3 。
In the present invention, the particle size of the oil palm shells is preferably 5 to 20mm, more preferably 6 to 17mm, and still more preferably 13mm; the apparent density of the oil palm shells is preferably 1320-1380 kg/m 3 More preferably 1326 to 1374kg/m 3 More preferably 1358kg/m 3 。
In the present invention, the cementitious material is preferably a mixture of slag, fly ash and silica fume.
In the present invention, the mass of the slag is preferably 25.5 to 70%, more preferably 28 to 64%, and still more preferably 57% of the total mass of the cement.
In the present invention, the particle size of the slag is preferably 7 to 10 μm, more preferably 7.5 to 9.6 μm, and still more preferably 8.3 μm.
In the present invention, the mass of the fly ash is preferably 15 to 70%, more preferably 16 to 65%, and still more preferably 32% of the total mass of the cement.
In the present invention, the particle diameter of the fly ash is preferably 10 to 16 μm, more preferably 11 to 15 μm, and still more preferably 12 μm.
In the present invention, the mass of the silica fume is preferably 0 to 15%, more preferably 3 to 14%, and still more preferably 11% of the total mass of the cement.
In the present invention, the particle size of the silica fume is preferably 0.1 to 0.3. Mu.m, more preferably 0.14 to 0.27. Mu.m, and still more preferably 0.18. Mu.m.
In the invention, the alkali activator is preferably selected from 10-16 mol/L NaOH solution and nano SiO 2 The composition is more preferably composed of 11-15 mol/L NaOH solution and nano SiO 2 The composition is more preferably composed of 14mol/L NaOH solution and nano SiO 2 And (4) forming.
In the invention, naOH solid and nano SiO 2 The mass ratio of (b) is preferably 0.6 to 1.2:1, more preferably 0.7 to 1.1:1, more preferably 0.9:1.
in the present invention, the mass ratio of the NaOH solid to the gelling material is preferably 0.05 to 0.13:1, more preferably 0.07 to 0.12:1, more preferably 0.08:1.
in the present invention, the water-to-gel ratio of water and the gelling material is preferably 0.3 to 0.5, more preferably 0.32 to 0.46, and still more preferably 0.35.
In the present invention, the steel fiber is preferably recovered from a waste rubber tire.
In the present invention, the length of the steel fiber is preferably 0.1 to 15mm, more preferably 6 to 12mm, and still more preferably 12mm; the diameter of the steel fibers is preferably 0.16 to 0.2mm, more preferably 0.17 to 0.19mm, and still more preferably 0.18mm.
In the present invention, the admixture preferably includes a retarder and an antifoaming agent.
In the present invention, the retarder is preferably BaCl 2 One or more of calcium sucrose and sodium gluconate, and preferably BaCl 2 And in sodium gluconateMore preferably sodium gluconate.
In the present invention, the defoaming agent is preferably a polyether-modified silicon defoaming agent.
The invention also provides a preparation method of the recycled geopolymer concrete, which comprises the following steps:
(1) Mixing nano SiO 2 Dissolving in NaOH solution to obtain alkali activator;
(2) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with part of water, adding the rubber particles and the cementing material, and stirring for 5-10 min to obtain a dry mixture;
(3) Dissolving the admixture in the residual water, adding the dry mixture, stirring for 1-3 min, adding the alkali activator, stirring for 3-5 min, adding the steel fiber within the following 2min, and continuously stirring for 3-5 min to obtain concrete slurry;
(4) Forming and curing the concrete slurry to obtain regenerated geopolymer concrete;
the step (1) and the step (2) are not limited in order.
In the present invention, the molding in the step (4) is preferably a molding method known to those skilled in the art, and is not particularly limited.
In the present invention, the curing in step (4) is preferably carried out in a concrete curing room at room temperature for 28 days.
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a recycled geopolymer concrete which is prepared from the following raw materials in unit volume by mass: recycled coarse aggregate of 920kg/m 3 (particle diameter of 5 to 20mm, water absorption of 5%, apparent density of 2475kg/m 3 ) (ii) a Recycled fine aggregate 700kg/m 3 (particle size 0.08-5 mm, water absorption 6%The apparent density was 2180kg/m 3 ) (ii) a Rubber particles 0kg/m 3 (ii) a Oil palm shell 0kg/m 3 (ii) a Slag 288.8kg/m 3 (S105 grade, average particle size 8.68 μm); 73.15kg/m of fly ash 3 (class F fly ash, average particle size 14.46 μm); silica fume 19.15kg/m 3 (average particle size 0.142. Mu.m); 86.1kg/m of 14mol/L NaOH solution 3 (NaOH solid purity 96%, content 33.3 kg/m) 3 ) (ii) a Nano SiO 2 37kg/m 3 (ii) a Additional 88.7kg/m of water 3 (ii) a Steel fiber 0kg/m 3 ；BaCl 2 3.8kg/m 3 (ii) a Polyether modified silicon defoamer 0.38kg/m 3 . In this example, naOH solid and Nano SiO 2 The mass ratio of (A) to (B) is 0.9; the mass ratio of NaOH solid to the cementing material is 0.09; the water-to-glue ratio was 0.37.
The preparation method comprises the following steps:
(1) Mixing nano SiO 2 Dissolving in a NaOH solution of 14mol/L, and cooling to obtain an alkali activator;
(2) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with one third of extra water, adding rubber particles, slag, fly ash and silica fume, and stirring for 3min to obtain a dry mixture;
(3) Adding BaCl 2 Dissolving the polyether modified silicon defoamer in the residual water, adding the dry mixture, stirring for 3min, adding the alkali activator, stirring for 5min, adding the steel fiber, and stirring for 5min to obtain concrete slurry;
(4) Pouring the concrete slurry into a mould (a cubic mould with the thickness of 150mm multiplied by 150mm, and pouring 12 moulds in total), using a vibration table and manual insertion to lead until the concrete slurry is compact, and covering a plastic film after troweling to maintain for 28 days to obtain the regenerated geopolymer concrete.
Wherein, the step (1) and the step (2) are not limited in order.
Example 2
The embodiment provides a recycled geopolymer concrete which is prepared from the following raw materials in unit volume by mass: recycled coarse aggregate 240kg/m 3 (particle diameter of 5 to 20mm, water absorption of 5%, apparent density of 2407 kg/m) 3 ) (ii) a Recycled fine aggregate 252kg/m 3 (particle diameter of 0.08-5 mm, water absorption of 6%, apparent density of 2194kg/m 3 ) (ii) a Rubber particles 86.3kg/m 3 (particle diameter of 0.7-5 mm, apparent density of 1123kg/m 3 ) (ii) a 584.1kg/m of oil palm shell 3 (particle diameter of 5 to 20mm, apparent density of 1339kg/m 3 ) (ii) a Slag 252.7kg/m 3 (S105 grade, average particle size 8.68 μm); 109.7kg/m of fly ash 3 (class F fly ash, average particle size 14.46 μm); silica fume 19kg/m 3 (average particle size 0.142. Mu.m); 86.1kg/m NaOH solution of 14mol/L 3 (NaOH solid purity 96%, content 33.3 kg/m) 3 ) (ii) a Nano SiO 2 37kg/m 3 (ii) a Additional water 81.1kg/m 3 (ii) a Steel fiber 58.5kg/m 3 (the length is 6-12 mm, the diameter is 0.16-0.32 mm); calcium sucrose 3.8kg/m 3 (ii) a Polyether modified silicon defoamer 0.38kg/m 3 . In this example, naOH solid and Nano SiO 2 The mass ratio of (A) to (B) is 0.9; the mass ratio of NaOH solid to the cementing material is 0.09; the water-to-glue ratio was 0.35.
The preparation method comprises the following steps:
(1) Mixing nano SiO 2 Dissolving in a NaOH solution of 14mol/L, and cooling to obtain an alkali activator;
(2) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with one third of extra water, adding rubber particles, slag, fly ash and silica fume, and stirring for 3min to obtain a dry mixture;
(3) Dissolving calcium saccharate and a defoaming agent in the residual water, adding the dry mixture, stirring for 3min, adding an alkali activator, stirring for 5min, adding steel fiber, and stirring for 5min to obtain concrete slurry;
(4) Pouring the concrete slurry into a mold (a cubic mold with the size of 150mm multiplied by 150mm, and pouring 12 molds in total), using a vibration table and manual insertion to lead the concrete slurry to be compact, covering a plastic film after trowelling, and curing for 28 days to obtain the recycled geopolymer concrete.
Wherein, the step (1) and the step (2) are not limited in order.
Example 3
This example provides a recycled geopolymer concrete comprising, by mass per unit volumeThe raw materials of the following components are prepared: recycled coarse aggregate of 720kg/m 3 (particle diameter of 5 to 20mm, water absorption of 5%, apparent density of 2407 kg/m) 3 ) (ii) a Recycled fine aggregate 252kg/m 3 (particle size of 0.08 to 5mm, water absorption of 6% and apparent density of 2194kg/m 3 ) (ii) a 86.3kg/m rubber particles 3 (particle diameter of 0 to 5mm, apparent density of 1123kg/m 3 ) (ii) a 264.5kg/m of oil palm shell 3 (particle diameter of 5 to 20mm, apparent density of 1339kg/m 3 ) (ii) a Slag 288.8kg/m 3 (S105 grade, average particle size 8.68 μm); 73.2kg/m of fly ash 3 (class F fly ash, average particle size 14.46 μm); silica fume 19kg/m 3 (average particle size 0.142. Mu.m); 79.4kg/m of 16mol/L NaOH solution 3 (NaOH solid purity 96%, content 34 kg/m) 3 ) (ii) a Nano SiO 2 37.8kg/m 3 (ii) a Additional 88.8kg/m of water 3 (ii) a Steel fiber 56kg/m 3 (the length is 6-12 mm, the diameter is 0.16-0.32 mm); calcium sucrose 3.8kg/m 3 (ii) a 0.38kg/m of polyether modified silicon defoamer 3 . In this example, naOH solid and Nano SiO 2 The mass ratio of (A) to (B) is 0.9; the mass ratio of NaOH solid to the cementing material is 0.09; the water-to-glue ratio was 0.35.
The preparation method comprises the following steps:
(1) Mixing nano SiO 2 Dissolving in 16mol/L NaOH solution to obtain an alkali activator;
(2) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with one third of water, adding rubber particles, slag, fly ash and silica fume, and stirring for 3min to obtain a dry mixture;
(3) Dissolving sodium gluconate and polyether modified silicon defoamer in the residual water, adding the dry mixture, stirring for 3min, adding the alkali activator, stirring for 5min, adding the steel fiber, and stirring for 5min to obtain concrete slurry;
(4) Pouring the concrete slurry into a mould (a cubic mould with the thickness of 150mm multiplied by 150mm, and pouring 12 moulds in total), using a vibration table and manual insertion to lead until the concrete slurry is compact, and covering a plastic film after troweling to maintain for 28 days to obtain the regenerated geopolymer concrete.
Wherein, the step (1) and the step (2) are not limited in order.
Example 4
The embodiment provides a recycled geopolymer concrete which is prepared from the following raw materials in unit volume by mass: recycled coarse aggregate 400kg/m 3 (particle size 5-20 mm, water absorption 5%, apparent density 2407 kg/m) 3 ) (ii) a Recycled fine aggregate 410kg/m 3 (particle diameter of 0.08-5 mm, water absorption of 6%, apparent density of 2194kg/m 3 ) (ii) a Rubber particles 84.2kg/m 3 (particle diameter of 0 to 5mm, apparent density of 1123kg/m 3 ) (ii) a 220.4kg/m of oil palm shell 3 (particle diameter of 5 to 20mm, apparent density of 1339kg/m 3 ) (ii) a 180.5kg/m slag 3 (S105 grade, average particle size 8.68 μm); 180.5kg/m of fly ash 3 (class F fly ash, average particle size 14.46 μm); 19kg/m silica fume 3 (average particle size 0.142. Mu.m); 86.1kg/m NaOH solution of 14mol/L 3 (NaOH solid purity 96%, content 33.3 kg/m) 3 ) (ii) a Nano SiO 2 37kg/m 3 (ii) a Additional water 81.1kg/m 3 (ii) a Steel fiber 58.5kg/m 3 (the length is 6-12 mm, the diameter is 0.16-0.32 mm); 3.8kg/m sodium gluconate 3 (ii) a Polyether modified silicon defoamer 1kg/m 3 . In this example, naOH solid and Nano SiO 2 The mass ratio of (A) to (B) is 0.9; the mass ratio of NaOH solid to the cementing material is 0.09; the water-to-glue ratio was 0.35.
The preparation method comprises the following steps:
(1) Mixing nano SiO 2 Dissolving in a NaOH solution of 14mol/L to obtain an alkali activator;
(2) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with one third of water, adding rubber particles, slag, fly ash and silica fume, and stirring for 3min to obtain a dry mixture;
(3) Dissolving sodium gluconate and polyether modified silicon defoamer in the residual water, adding the dry mixture, stirring for 3min, adding an alkali activator, stirring for 5min, adding steel fiber, and stirring for 5min to obtain concrete slurry;
(4) Pouring the concrete slurry into a mold (a cubic mold with the size of 150mm multiplied by 150mm, and pouring 12 molds in total), using a vibration table and manual insertion to lead the concrete slurry to be compact, covering a plastic film after trowelling, and curing for 28 days to obtain the recycled geopolymer concrete.
Wherein, the step (1) and the step (2) are not limited in order.
Example 5
This example provides a recycled geopolymer concrete, specifically referring to example 1, except that the sodium-silicon ratio and the sodium-glue ratio (NaOH solid to nano SiO) 2 The mass ratio of NaOH solids to cement) to 1.2 and 0.12, respectively.
Example 6
This example provides a recycled geopolymer concrete, see specifically example 1, except that the oil palm shell and the rubber powder are respectively replaced by recycled coarse aggregate and recycled fine aggregate at 80% and 40% of the volume, and 0.5% recycled steel fiber is used, i.e., the amount of recycled coarse aggregate is reduced to 184kg/m 3 The dosage of the recycled fine aggregate is reduced to 420kg/m 3 The dosage of the oil palm shells is 405.6kg/m 3 The amount of the rubber powder is 143.8kg/m 3 The recycled steel fiber consumption is 39kg/m 3 。
Example 7
This example provides a recycled geopolymer concrete, see example 1 for details, except that the ratio of slag to fly ash is from 8:2 is changed into 2:8, the mixing amount of the silica fume is increased to 15 percent from 5 percent of the mass fraction of the cementing material, namely the slag dosage is 65.5kg/m 3 The using amount of the fly ash is 258.4kg/m 3 The dosage of the silica fume is 57kg/m 3 。
And (3) performance testing: the setting time of the concrete slurry of the recycled geopolymer concrete prepared in the examples 1 to 7 is measured according to the standard of the test method for the performance of common concrete mixtures (GB/T500802002), and the 7d compressive strength and the 28d compressive strength of the concrete are tested according to the standard of the test method for the mechanical properties of common concrete (GB/T50081-2016); the volume weight of the concrete is tested according to the test standard of the performance method of the common concrete mixture (GB/T50080-2016). The test results are shown in table 1.
TABLE 1 recycled Geopolymer concrete Performance test results
As can be seen from Table 1, the replacement of the recycled fine aggregate and the recycled coarse aggregate by the rubber particles and the oil palm shells can obviously improve the compressive strength of the concrete and solve the problem of low compressive strength existing in the combination of the recycled aggregate and the cementing material. Meanwhile, the compressive strength can be correspondingly adjusted to change within a certain range by adjusting the using amounts of the rubber particles and the oil palm shells, the highest 7d average compressive strength can reach 32.79MPa, the highest 28d average compressive strength can reach 41.3MPa, and the rubber has excellent mechanical properties.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (7)
1. The recycled geopolymer concrete is characterized by being prepared from the following raw materials in unit volume mass:
the cementing material is a mixture of slag, fly ash and silica fume, wherein the silica fume accounts for 0-15% of the total mass of the cementing material, the slag accounts for 25.5-70% of the total mass of the cementing material, and the fly ash accounts for 15-70% of the total mass of the cementing material; the grain diameter of the oil palm shells is 5-20 mm; the alkali activator consists of 10-16 mol/L NaOH solution and nanometer SiO 2 Composition of NaOH and nano SiO in the NaOH solution 2 The mass ratio of (A) to (B) is 0.6-1.2: 1, the mass ratio of NaOH to a cementing material in the NaOH solution is 0.05-0.13: 1; the length of the steel fiber is 6-12 mm, and the diameter of the steel fiber is 0.17-0.19 mm; the admixture comprises a retarder and an antifoaming agent.
2. The recycled geopolymer concrete as claimed in claim 1, wherein the recycled coarse aggregate has a particle size of 5-20 mm, the recycled fine aggregate has a particle size of 0.08-5 mm, and the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is 0.8-1.6: 1.
3. the recycled geopolymer concrete as claimed in claim 1 or 2, wherein said rubber particles have a particle size of 0.05-5 mm and an apparent density of 1110-1150 kg/m 3 。
4. The recycled geopolymer concrete of claim 3, wherein said oil palm shells have an apparent density of 1320 to 1380kg/m 3 。
5. The recycled geopolymer concrete of claim 4, wherein the slag has a particle size of 7 to 10 μm, the fly ash has a particle size of 10 to 16 μm, and the silica fume has a particle size of 0.1 to 0.3 μm.
6. The recycled geopolymer concrete of claim 1, wherein said retarder is BaCl 2 One or more of calcium sucrose and sodium gluconate.
7. The method for preparing recycled geopolymer concrete according to any one of claims 1 to 6, comprising the steps of:
(1) Mixing the recycled coarse aggregate, the recycled fine aggregate and the oil palm shell with part of water, adding the rubber particles and the cementing material, and stirring for 5-10 min to obtain a dry mixture;
(2) Dissolving the admixture in the residual water, adding the dry mixture, stirring for 1-3 min, adding the alkali activator, stirring for 3-5 min, adding the steel fiber, and stirring for 3-5 min to obtain concrete slurry;
(3) And forming and curing the concrete slurry to obtain the regenerated geopolymer concrete.
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