CN118344093A - Multielement solid waste base recycled concrete and preparation method thereof - Google Patents
Multielement solid waste base recycled concrete and preparation method thereof Download PDFInfo
- Publication number
- CN118344093A CN118344093A CN202410465958.1A CN202410465958A CN118344093A CN 118344093 A CN118344093 A CN 118344093A CN 202410465958 A CN202410465958 A CN 202410465958A CN 118344093 A CN118344093 A CN 118344093A
- Authority
- CN
- China
- Prior art keywords
- equal
- parts
- less
- slag powder
- solid waste
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 62
- 239000002910 solid waste Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000002893 slag Substances 0.000 claims abstract description 96
- 239000000843 powder Substances 0.000 claims abstract description 84
- 239000000463 material Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000004575 stone Substances 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 12
- 239000003469 silicate cement Substances 0.000 claims abstract description 8
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 7
- 239000008030 superplasticizer Substances 0.000 claims abstract description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 35
- 239000011574 phosphorus Substances 0.000 claims description 35
- 229910052698 phosphorus Inorganic materials 0.000 claims description 35
- 238000007670 refining Methods 0.000 claims description 22
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims description 18
- 238000005286 illumination Methods 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 6
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 5
- 239000002159 nanocrystal Substances 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 229960000907 methylthioninium chloride Drugs 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 10
- 239000012615 aggregate Substances 0.000 description 42
- 230000000052 comparative effect Effects 0.000 description 27
- 238000001514 detection method Methods 0.000 description 25
- 239000002585 base Substances 0.000 description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 239000004568 cement Substances 0.000 description 10
- 239000007858 starting material Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000036571 hydration Effects 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Abstract
The invention discloses a preparation method of a multi-element solid waste base recycled concrete, which comprises the following raw materials in parts by weight: 63-105 parts of silicate cement clinker, 189-273 parts of composite modified cementing material, 21-42 parts of superfine slag powder, 21-42 parts of granulated blast furnace slag powder, 198-461 parts of modified recycled coarse aggregate, 141-283 parts of modified recycled fine aggregate, 857-1120 parts of crushed stone, 283-424 parts of fine sand, 0.42-1.26 parts of polycarboxylate superplasticizer and 147 parts of water. The advantages are that: 1) The compressive strength of the concrete material can be obviously improved, and experiments prove that the 3d compressive strength of the multi-element solid waste base recycled concrete prepared by the method is more than or equal to 15.0MPa, the 7d compressive strength is more than or equal to 20.0MPa, and the 28d compressive strength is more than or equal to 40.0MPa. 2) Realizing the comprehensive utilization of various industrial solid wastes and building solid wastes.
Description
Technical Field
The invention relates to a concrete production technology, in particular to a solid waste base recycled concrete technology.
Background
The concrete is one of the building materials with the largest consumption in the current society, and is taken as a structural material, the composition of the building material generally comprises water, aggregate, cement and mineral admixture, the building material meeting the service requirements of safety, durability and the like is formed after hydration hardening, the concrete is widely applied to civil buildings, public infrastructure, bridges and other concrete engineering buildings, and along with the development of the construction technology of the building engineering and the low-carbon development of the building industry, the higher requirements on the performance of the concrete are provided, including environmental protection, low carbon, energy conservation, environmental protection, good mechanical property, high durability, high working performance and the like.
The main material cement of the common concrete is a high-carbon emission product, the carbon emission of single ton cement production is as high as 0.732 ton CO 2, but one cement accounts for about 10-12% of the total national carbon emission. The high-carbon emission material-cement dosage in the concrete in unit volume is reduced, and the use of solid waste-based cementing materials to replace the traditional high-carbon emission cementing material cement completely or partially is an important path for realizing low-carbon development. The phosphorous slag, mineral powder, superfine slag powder and the like have potential hydration activity, can realize hydration and self-hardening under the condition of an exciting agent, and can be used as a solid waste-based cementing material, so that the green and harmless treatment of the solid waste can be realized, and the carbon emission of concrete can be greatly reduced; besides the cementing material and water, the aggregate is also the main part of the concrete, accounting for about 50-80% of the volume of the concrete. The recycled aggregate is the construction waste generated in the infrastructure construction process, and the preparation of a huge amount of construction waste into the recycled aggregate is applied to concrete, so that the recycled aggregate is an important direction for recycling.
Although the solid waste has a certain utilization value, the solid waste is difficult to directly apply due to special physical and chemical properties, such as slow setting and low early strength of the phosphorus slag, and the recycled aggregate has the defects of high porosity, high water absorption, low strength and the like, and can be effectively applied to concrete only by adopting a certain pretreatment and a compounding method.
Therefore, based on the problems, the invention carries out modification treatment on various solid waste materials and cooperatively utilizes industrial solid waste and building solid waste, fully plays the self-modification of various solid waste and the mutual synergistic effect thereof, prepares the multi-element solid waste-based recycled concrete, and is an effective way for realizing the cooperative and the disposal of solid waste resources.
Disclosure of Invention
The invention provides a multi-element solid waste base recycled concrete and a preparation method thereof for improving the compressive strength of concrete.
The technical scheme adopted by the invention is as follows: the preparation method of the multi-element solid waste base recycled concrete comprises the following components in parts by weight: 63-105 parts of silicate cement clinker, 189-273 parts of composite modified cementing material, 21-42 parts of superfine slag powder, 21-42 parts of granulated blast furnace slag powder, 198-461 parts of modified recycled coarse aggregate, 141-283 parts of modified recycled fine aggregate, 857-1120 parts of crushed stone, 283-424 parts of fine sand, 0.42-1.26 parts of polycarboxylate superplasticizer and 147 parts of water;
the composite modified cementing material consists of electric furnace refining slag powder and modified electric furnace phosphorus slag powder according to the mass ratio of 1:1.2-2.7;
The modified electric furnace phosphorus slag powder consists of electric furnace phosphorus slag powder and a modified component according to the mass ratio of 27.3-79.6:1, and the modified component consists of C-S-H nanocrystal cores and diethanol monoisopropanolamine according to the mass ratio of 5-420:1.
Part of the composition description:
The electric furnace refining slag powder disclosed by the invention refers to water quenching slag generated by an electric furnace refining steel water quenching process, and the water quenching slag is ground to obtain the electric furnace refining slag powder disclosed by the invention. The electric furnace refining slag powder of the invention is different from steel slag which is commonly called in the field, wherein steel slag refers to various oxides formed by oxidizing impurities in pig iron in the smelting process and a mixture formed by salts generated by the reaction of the oxides and a solvent, and the sources, the components and the properties of the slag powder are obviously different from those of the electric furnace refining slag powder of the invention.
The invention relates to electric furnace phosphorus slag powder, which is waste residue generated by adopting an electric furnace method to prepare yellow phosphorus, discharging and carrying out water quenching treatment, and grinding the waste residue to obtain the electric furnace phosphorus slag powder.
The superfine slag powder is obtained by removing plastic, paper, wood dust and other impurities from waste concrete or waste mortar, crushing, further grinding, and sieving to obtain powder with D 50 of 5-15 mu m, namely the superfine slag powder.
It is easy to understand by those skilled in the art that the granulated blast furnace slag powder of the present invention is obtained by drying and grinding granulated blast furnace slag conforming to GB/T203 standard.
Those skilled in the art will readily appreciate that the water of the present invention is water conforming to the water for concrete standard (JGJ 63).
As a further improvement of the invention, the electric furnace refining slag powder satisfies the following conditions: the density is more than or equal to 2.8g/cm 3, the specific surface area is more than or equal to 400m 2/kg, the mass fraction of chloride ions is less than or equal to 0.06%, the mass fraction of sulfur trioxide is less than or equal to 3%, the mass fraction of free calcium oxide is less than or equal to 4%, the autoclave expansion rate for 6 hours is less than or equal to 0.5%, the internal illumination index IRa is less than or equal to 1.0, and the external illumination index Igamma is less than or equal to 1.0.
As a further improvement of the invention, the electric furnace phosphorus slag powder satisfies the following conditions: the specific surface area is more than or equal to 400m 2/kg, the internal illumination index I Ra is less than or equal to 1.3, and the external illumination index I γ is less than or equal to 1.3.
As a further improvement of the present invention, the Portland cement clinker satisfies: the mass fraction of C 3 S is more than or equal to 50%, the total mass fraction of C 3 S and C 2 S is more than or equal to 66%, the 3d compressive strength is more than or equal to 26.0MPa, and the 28d compressive strength is more than or equal to 52.5MPa. The invention adopts silicate cement clinker as early strength component and strength excitation component of concrete, wherein C 3 S and C 2 S in the clinker have hydraulic property, so that not only can better strength be formed, but also calcium hydroxide generated after hydration has alkali excitation effect on phosphorus slag and electric furnace refining slag. The proper amount of cement clinker is favorable for better exciting the activities of the phosphorus slag powder and the electric furnace refining slag powder, promoting the formation strength of the phosphorus slag powder and the electric furnace refining slag powder and improving the early activity of concrete.
As a further improvement of the present invention, the ultrafine slag building powder satisfies: d 50 is 5-15 mu m, the specific surface area is more than or equal to 900m 2/kg, the water demand ratio is less than or equal to 105%, the 28D activity index is more than or equal to 70%, the MB value of methylene blue is less than 1.4, the mass fraction of chloride ions is less than or equal to 0.06%, and the mass fraction of sulfur trioxide is less than or equal to 3%. The superfine slag building powder has micro aggregate effect, can fill the gaps in the slurry, and is beneficial to the working performance of the freshly mixed slurry. Meanwhile, the solid waste of the building contains active components such as unhydrated cement particles and calcium hydroxide, has certain hydration activity, can realize the recycling of the unhydrated cement particles and other components in the regenerated solid waste of the building, and increases the early strength of cement-based materials.
As a further improvement of the present invention, the granulated blast furnace slag powder satisfies: the density is more than or equal to 2.8g/cm 3, the specific surface area is more than or equal to 400m 2/kg, the 28d activity index is more than or equal to 95%, the mass fraction of the glass body is more than or equal to 85%, the mass fraction of sulfur trioxide is less than or equal to 4%, the mass fraction of chloride ions is less than or equal to 0.06%, the internal illumination index I Ra is less than or equal to 1, and the external illumination index I γ is less than or equal to 1. The invention adopts granulated blast furnace slag powder as an auxiliary cementing material, has higher hydration activity, and can effectively improve the strength of concrete.
The modified recycled coarse aggregate and the modified recycled fine aggregate of the present invention can be prepared as follows:
S1, crushing a waste concrete test block with the primary strength grade of C30-C60, and grading and shaping to obtain a recycled coarse aggregate and a recycled fine aggregate;
S2, respectively soaking the recycled coarse aggregate and the recycled fine aggregate in a mixed solution of sodium silicate and polyvinyl alcohol for more than 2 hours, taking out and drying to obtain the composite material; the mass percentage content of sodium silicate in the mixed solution is 8-10%, and the mass percentage content of polyvinyl alcohol is 6-10%.
According to the scheme, the modified recycled aggregate is subjected to particle shaping treatment and pre-soaking treatment, so that on one hand, the unstable old mortar surface layer is removed, and on the other hand, the stable structure is strengthened, and the reinforcement of the recycled aggregate is realized.
As a further improvement of the invention, the fine sand is continuous grain size sand with a grain size of less than 5mm and an MB value of less than 1.4.
As a further development of the invention, the crushed stone is rock particles with a particle size of more than 4.75 mm. The broken stone is rock particles formed by crushing, sieving and other mechanical processing of natural rock, pebbles or mine waste stones, and the performance of the broken stone meets the requirements of 'pebbles and broken stone for construction' GB/T14685.
The invention also discloses the multi-element solid waste base recycled concrete, which is prepared by the preparation method of the multi-element solid waste base recycled concrete.
The beneficial effects of the invention are as follows: 1) The compressive strength of the concrete material can be obviously improved, and experiments prove that the 3d compressive strength of the multi-element solid waste base recycled concrete prepared by the method is more than or equal to 15.0MPa, the 7d compressive strength is more than or equal to 20.0MPa, and the 28d compressive strength is more than or equal to 40.0MPa. 2) Realizing the comprehensive utilization of various industrial solid wastes and building solid wastes.
Detailed Description
The invention is further illustrated below with reference to examples.
For ease of comparison, the following examples and comparative examples each use the same batch of raw materials, and the properties of each raw material involved are as follows:
Refining slag powder by an electric furnace: density 2.85g/cm 3, specific surface area 429m 2/kg, chloride ion mass fraction 0.02%, sulfur trioxide mass fraction 1.1%, free calcium oxide mass fraction 1.2%, 6h autoclave expansion rate 0.22%, internal index ira=0.2, external index iγ=0.2.
Electric furnace phosphorus slag powder: the mass fraction of the chemical components is ：CaO＝51％、SiO2＝42％、P2O5＝1.2％、Al2O3＝7％、Fe2O3＝2.5％、F＝1％;, the specific surface area is 443m 2/kg, the internal illumination index is Ra =1.1, and the external illumination index is γ =0.8.
Portland cement clinker: 61% of C 3 S, 72% of the total mass of C 3 S and C 2 S, 29.0MPa of 3d compressive strength and 52.7MPa of 28d compressive strength.
Superfine slag powder: d 50 =7.3 μm, specific surface area 954m 2/kg, water demand ratio 102%,28D activity index 73%, methylene blue MB value 1.2, chloride ion mass fraction 0.01%, sulfur trioxide mass fraction 1.2%.
Granulating blast furnace slag powder: density 2.86g/cm 3, specific surface area 449m 2/kg, 28d activity index 103%, vitreous mass fraction 91%, sulfur trioxide mass fraction 1.3%, chloride ion mass fraction 0.02%, internal index I Ra =0.7, external index I γ =0.5.
Polycarboxylate water reducer: the water content of the polycarboxylic acid high-performance water reducer is 1.0%, and the water reducing rate is 40%.
Fine sand: continuous grain size fraction of less than 5mm, MB value 0.9.
Broken stone: rock particles with a particle size of more than 4.75 mm.
Water: tap water conforming to the concrete water Standard (JGJ 63-2006).
Modified recycled coarse aggregate and modified recycled fine aggregate: the preparation method comprises the following steps:
selecting a waste concrete test block with the primary strength grade of C30-C60, removing impurities, crushing, screening the crushed recycled aggregate according to the requirements of the specification of recycled coarse aggregate for concrete GB/T25177-2010 and recycled fine aggregate for concrete and mortar GB/T25176-2010, screening the crushed recycled aggregate according to the particle size, shaping the screened recycled aggregate, and removing unstable old mortar surface particles to obtain recycled coarse aggregate and recycled fine aggregate;
Then, the recycled coarse aggregate and the recycled fine aggregate are respectively soaked in a mixed solution of sodium silicate and polyvinyl alcohol for 4 hours, and are placed in a baking oven at 40 ℃ for drying after being soaked; the mass percentage of sodium silicate in the mixed solution is 8 percent, and the mass percentage of polyvinyl alcohol is 7 percent.
Embodiment one:
the method for preparing the multi-element solid waste base recycled concrete comprises the following steps:
(1) The components are measured according to the following production raw material formula:
105 parts of silicate cement clinker, 233 parts of composite modified cementing material, 42 parts of superfine slag powder, 42 parts of granulated blast furnace slag powder, 198 parts of modified recycled coarse aggregate, 141 parts of modified recycled fine aggregate, 1120 parts of crushed stone, 424 parts of fine sand, 1.26 parts of polycarboxylate superplasticizer and 147 parts of water; the composite modified cementing material consists of electric furnace refining slag powder and modified electric furnace phosphorus slag powder according to the mass ratio of 1:1.78; the modified electric furnace phosphorus slag powder consists of electric furnace phosphorus slag powder and a modified component according to the mass ratio of 69.7:1, and the modified component consists of C-S-H nanocrystal cores (solid content is 14.3%) and diethanol monoisopropanolamine according to the mass ratio of 210:1. And uniformly stirring the raw materials to obtain the multi-element solid waste base recycled concrete.
(2) Placing the prepared concrete into a mould with the thickness of 100mm multiplied by 100mm, vibrating and compacting, placing the mould in a standard curing room for curing for 24 hours under the condition that the relative humidity is more than or equal to 95%, demolding, continuously placing the test block in the standard curing environment for curing until the test block reaches the age (3 d, 7d and 28 d), and detecting the mechanical property of the test block. The detection method is carried out according to the current standard of GB/T50081 of the test method Standard of the mechanical Properties of common concrete.
The detection results are shown in Table 1.
Embodiment two:
the method for preparing the multi-element solid waste base recycled concrete comprises the following steps:
(1) The components are measured according to the following production raw material formula:
105 parts of silicate cement clinker, 235 parts of composite modified cementing material, 42 parts of superfine slag powder, 42 parts of granulated blast furnace slag powder, 198 parts of modified recycled coarse aggregate, 141 parts of modified recycled fine aggregate, 1120 parts of crushed stone, 424 parts of fine sand, 1.26 parts of polycarboxylate superplasticizer and 147 parts of water; the composite modified cementing material consists of electric furnace refining slag powder and modified electric furnace phosphorus slag powder according to the mass ratio of 1:1.24; the modified electric furnace phosphorus slag powder consists of electric furnace phosphorus slag powder and a modified component according to the mass ratio of 33.8:1, and the modified component consists of C-S-H nanocrystal cores (solid content is 14.3%) and diethanol monoisopropanolamine according to the mass ratio of 123:1. And uniformly stirring the raw materials to obtain the multi-element solid waste base recycled concrete.
(2) The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Embodiment III:
the method for preparing the multi-element solid waste base recycled concrete comprises the following steps:
(1) The components are measured according to the following production raw material formula:
105 parts of silicate cement clinker, 233 parts of composite modified cementing material, 42 parts of superfine slag powder, 42 parts of granulated blast furnace slag powder, 330 parts of modified recycled coarse aggregate, 198 parts of modified recycled fine aggregate, 989 parts of crushed stone, 367 parts of fine sand, 1.26 parts of polycarboxylate water reducer and 147 parts of water; the composite modified cementing material consists of electric furnace refining slag powder and modified electric furnace phosphorus slag powder according to the mass ratio of 1:1.78; the modified electric furnace phosphorus slag powder consists of electric furnace phosphorus slag powder and a modified component according to the mass ratio of 69.7:1, and the modified component consists of C-S-H nanocrystal cores (solid content is 14.3%) and diethanol monoisopropanolamine according to the mass ratio of 210:1. And uniformly stirring the raw materials to obtain the multi-element solid waste base recycled concrete.
(2) The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example one:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the composite modified cementing material is all modified electric furnace phosphorus slag powder (electric furnace refining slag powder is not used), and the total dosage of the composite modified cementing material is 233 parts.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example two:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the composite modified cementing material is all electric furnace refining slag powder (no modified electric furnace phosphorus slag powder is used), and the total dosage of the composite modified cementing material is 233 parts.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example three:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the electric furnace phosphorus slag powder is not modified, and the dosage is the same as that of the modified electric furnace phosphorus slag powder in the first embodiment.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example four:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the composite modified cementing material is all electric furnace phosphorus slag powder which is not subjected to modification treatment (electric furnace refining slag powder is not used), and the total dosage of the composite modified cementing material is 233 parts.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example five:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: and respectively replacing the modified recycled coarse aggregate and the modified recycled fine aggregate with the recycled coarse aggregate and the recycled fine aggregate which are of equal mass and are not soaked in the mixed solution for modification.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example six:
this comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the electric furnace refining slag powder is replaced by steel slag powder with the specific surface area of 433m 2/kg and the same mass.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example seven:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the silicate cement clinker, the composite modified cementing material, the superfine slag powder and the granulated blast furnace slag powder in the raw materials are replaced by the modified electric furnace phosphorus slag powder with equal mass, and 420 parts of the modified electric furnace phosphorus slag powder in the raw material formula are replaced.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Comparative example eight:
This comparative example is a control experiment of example one, conducted in the same procedure and conditions as example one, with all starting materials being in the same batch as example one, except that: the broken stone in the raw materials is replaced by the modified recycled coarse aggregate with equal mass, the fine sand is replaced by the modified recycled fine aggregate with equal mass, the modified recycled coarse aggregate in the raw material formula is increased to 1318 parts after replacement, and the modified recycled fine aggregate is increased to 565 parts.
The detection method is the same as that of the first embodiment, and the detection results are shown in table 1.
Table 1 results of testing the compressive properties of the concrete materials of examples and comparative examples
As can be seen from the detection results of the first embodiment, the second embodiment and the third embodiment in the table 1, the multi-element solid waste base recycled concrete prepared by the method has 3d compressive strength of more than 15.0MPa,7d compressive strength of more than 22MPa and 28d compressive strength of more than 43MPa, and has excellent compressive property.
As can be seen from comparison of the detection results of the first embodiment, the first comparative embodiment and the second comparative embodiment in Table 1, on the premise that the total amount of the composite modified cementing material is not changed, the compressive strength of the first comparative embodiment of the modified electric furnace phosphorus slag powder alone is respectively 9.3, 14.5 and 35.8MPa in different ages, the compressive strength of the second comparative embodiment of the electric furnace refined slag powder alone is respectively 12.1, 16.4 and 32.1MPa, and the compressive strength of the second comparative embodiment of the electric furnace refined slag powder alone is calculated to be 10.3, 15.2 and 34.5MPa in different ages when the two materials are combined according to the mass ratio of the electric furnace refined slag powder to the modified electric furnace phosphorus slag powder=1:1.78, and the practical measured values are 18.7, 29.7 and 58.3MPa, which are far higher than the theoretical values, so that the composite modified cementing material composed of the modified electric furnace phosphorus slag powder and the refined slag powder has obvious synergistic effect of improving the compressive performance of concrete.
As can be seen from the detection results of the second comparative example, the third comparative example and the fourth comparative example, the compressive strength of the concrete using the electric furnace refining slag alone and the non-modified electric furnace phosphorus slag alone is not ideal, and the compressive strength of the concrete is close to the theoretical value when the two are combined, and no obvious synergistic effect is shown.
As can be seen from a comparison of example one and comparative example six, when the electric furnace refining slag is replaced with steel slag, the concrete pressure resistance is significantly reduced, and it is seen that the steel slag cannot be used in the system of the present invention.
Claims (10)
1. The preparation method of the multi-element solid waste base recycled concrete is characterized in that the production raw material formula comprises the following components in parts by weight: 63-105 parts of silicate cement clinker, 189-273 parts of composite modified cementing material, 21-42 parts of superfine slag powder, 21-42 parts of granulated blast furnace slag powder, 198-461 parts of modified recycled coarse aggregate, 141-283 parts of modified recycled fine aggregate, 857-1120 parts of crushed stone, 283-424 parts of fine sand, 0.42-1.26 parts of polycarboxylate superplasticizer and 147 parts of water;
the composite modified cementing material consists of electric furnace refining slag powder and modified electric furnace phosphorus slag powder according to the mass ratio of 1:1.2-2.7;
The modified electric furnace phosphorus slag powder consists of electric furnace phosphorus slag powder and a modified component according to the mass ratio of 27.3-79.6:1, and the modified component consists of C-S-H nanocrystal cores and diethanol monoisopropanolamine according to the mass ratio of 5-420:1.
2. The method for preparing the multi-element solid waste-based recycled concrete according to claim 1, wherein the electric furnace refining slag powder satisfies the following conditions: the density is more than or equal to 2.8g/cm 3, the specific surface area is more than or equal to 400m 2/kg, the mass fraction of chloride ions is less than or equal to 0.06%, the mass fraction of sulfur trioxide is less than or equal to 3%, the mass fraction of free calcium oxide is less than or equal to 4%, the autoclave expansion rate for 6 hours is less than or equal to 0.5%, the internal illumination index IRa is less than or equal to 1.0, and the external illumination index Igamma is less than or equal to 1.0.
3. The method for preparing the multi-element solid waste-based recycled concrete according to claim 1, wherein the electric furnace phosphorus slag powder satisfies the following conditions: the specific surface area is more than or equal to 400m 2/kg, the internal illumination index I Ra is less than or equal to 1.3, and the external illumination index I γ is less than or equal to 1.3.
4. The method for preparing the multi-element solid waste-based recycled concrete according to claim 1, wherein the Portland cement clinker satisfies: the mass fraction of C 3 S is more than or equal to 50%, the total mass fraction of C 3 S and C 2 S is more than or equal to 66%, the 3d compressive strength is more than or equal to 26.0MPa, and the 28d compressive strength is more than or equal to 52.5MPa.
5. The method for preparing the multi-element solid waste-based recycled concrete according to claim 1, wherein the superfine slag building powder satisfies the following conditions: d 50 is 5-15 mu m, the specific surface area is more than or equal to 900m 2/kg, the water demand ratio is less than or equal to 105%, the 28D activity index is more than or equal to 70%, the MB value of methylene blue is less than 1.4, the mass fraction of chloride ions is less than or equal to 0.06%, and the mass fraction of sulfur trioxide is less than or equal to 3%.
6. The method for preparing a multi-element solid waste-based recycled concrete according to claim 1, wherein the granulated blast furnace slag powder satisfies: the density is more than or equal to 2.8g/cm 3, the specific surface area is more than or equal to 400m 2/kg, the 28d activity index is more than or equal to 95%, the mass fraction of the glass body is more than or equal to 85%, the mass fraction of sulfur trioxide is less than or equal to 4%, the mass fraction of chloride ions is less than or equal to 0.06%, the internal illumination index I Ra is less than or equal to 1, and the external illumination index I γ is less than or equal to 1.
7. The method for producing a multi-element solid waste-based recycled concrete according to any one of claims 1 to 6, wherein the method for producing the modified recycled coarse aggregate and the modified recycled fine aggregate is:
S1, crushing a waste concrete test block with the primary strength grade of C30-C60, and grading and shaping to obtain a recycled coarse aggregate and a recycled fine aggregate;
S2, respectively soaking the recycled coarse aggregate and the recycled fine aggregate in a mixed solution of sodium silicate and polyvinyl alcohol for more than 2 hours, taking out and drying to obtain the composite material; the mass percentage content of sodium silicate in the mixed solution is 8-10%, and the mass percentage content of polyvinyl alcohol is 6-10%.
8. The method for preparing the multi-element solid waste-based recycled concrete according to any one of claims 1 to 6, which is characterized in that: the fine sand is continuous grain grading sand with the grain diameter smaller than 5mm, and the MB value is smaller than 1.4.
9. The method for preparing the multi-element solid waste-based recycled concrete according to any one of claims 1 to 6, which is characterized in that: the broken stone is rock particles with the particle size of more than 4.75 mm.
10. A multi-solid waste-based recycled concrete produced by the production method of a multi-solid waste-based recycled concrete according to any one of claims 1 to 9.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118344093A true CN118344093A (en) | 2024-07-16 |
Family
ID=
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107459311B (en) | Preparation method of waste-utilizing, fracture-resisting and toughening wet-grinding slurry-like admixture | |
| CN111205003B (en) | Preparation method of regenerated cementing material | |
| CN112125584B (en) | Preparation method of low-hydration-heat green self-leveling concrete | |
| CN107572841B (en) | Low-carbon cementing material and method for preparing concrete | |
| CN110590198A (en) | Tungsten tailing cementing material and preparation method thereof | |
| CN113698164B (en) | Anti-cracking anti-settling road water-stabilizing layer material and preparation method thereof | |
| CN111995341A (en) | Full-solid waste pavement concrete utilizing steel slag in large proportion and preparation method thereof | |
| CN113213789B (en) | Paving brick prepared based on household garbage incineration fly ash and preparation method thereof | |
| CN111848083B (en) | Environment-friendly phosphogypsum composite stable material and preparation method thereof | |
| CN111253094A (en) | Geopolymer gel material and application thereof | |
| CN103159450A (en) | Production method of foamed concrete block manufactured from steel slag | |
| CN104817286B (en) | Preparation method of full-tailing consolidation discharge cementing agent | |
| CN107555896A (en) | It is a kind of to excite slag and the standby admixture of coal ash for manufacturing and the high-strength concrete prepared using admixture with waterglass | |
| CN114230208B (en) | High-strength cement and preparation method thereof | |
| CN115626810A (en) | Phosphogypsum stabilizing material and application thereof | |
| CN104386954B (en) | A kind of abrasion-proof terrace mortar with silicon carbide waste as reinforcing material and preparation method | |
| CN113772982B (en) | Composite sand for concrete, premixed concrete and preparation method thereof | |
| CN110590299A (en) | Low-shrinkage wear-resistant cement concrete road rapid repairing material and preparation method thereof | |
| CN104961363B (en) | A kind of method of the active ground-slag of use shaft kiln factory and office reason discarded concrete system and aggregate | |
| CN108529925B (en) | Anti-cracking early strength agent for shield segment concrete and use method thereof | |
| CN111732381A (en) | Preparation method of phosphorus slag powder concrete | |
| CN114477810B (en) | Waste concrete-based low-carbon low-heat high-belite cement clinker and preparation method thereof | |
| CN118344093A (en) | Multielement solid waste base recycled concrete and preparation method thereof | |
| CN112209641B (en) | Method for preparing cement by using waste sintered shale | |
| CN113004009A (en) | Environment-friendly high-strength concrete and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication |