CN115594446A - Preparation method of green concrete based on sludge and waste concrete - Google Patents
Preparation method of green concrete based on sludge and waste concrete Download PDFInfo
- Publication number
- CN115594446A CN115594446A CN202211011655.XA CN202211011655A CN115594446A CN 115594446 A CN115594446 A CN 115594446A CN 202211011655 A CN202211011655 A CN 202211011655A CN 115594446 A CN115594446 A CN 115594446A
- Authority
- CN
- China
- Prior art keywords
- sludge
- concrete
- water
- recycled
- waste concrete
- 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.)
- Granted
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 124
- 239000010802 sludge Substances 0.000 title claims abstract description 88
- 239000002699 waste material Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000004568 cement Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- 229910001868 water Inorganic materials 0.000 claims description 66
- 239000000203 mixture Substances 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 33
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 19
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 2
- 229910052622 kaolinite Inorganic materials 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000011376 self-consolidating concrete Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0436—Dredged harbour or river sludge
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a preparation method of green concrete based on sludge and waste concrete, which comprises the following steps: step S1, sludge pretreatment; s2, crushing waste concrete; s3, treating recycled fine aggregate; s4, treating the recycled coarse aggregate; and S5, preparing green concrete, wherein a large amount of construction wastes such as waste concrete, sludge in rivers, lakes and seas and the like are used as raw materials, so that a large amount of construction wastes are consumed, the resource recycling of the construction wastes is realized, high energy consumption generated by the traditional method is reduced, the green concrete is a green recycling technology, and the concrete road can be used for structures such as cement concrete surfaces in rural areas, and has wide application prospect and considerable benefits.
Description
Technical Field
The invention relates to the field of preparation methods of green concrete based on sludge and waste concrete. More particularly, the invention relates to a method for preparing green concrete based on sludge and waste concrete.
Background
With the large water content and complex composition of the sludge, secondary pollution is easy to generate, and the environment is extremely adversely affected by improper treatment, so that the treatment and the treatment of the sludge at the bottom of the dredged river become a problem which is generally concerned by people. The existing utilization technology of the sludge mainly comprises solidified soil, sintered ceramsite, non-fired ceramsite, sludge brick, sludge cement and the like, and the non-fired ceramsite has the widest technical prospect. The existing recycling path of the waste concrete is clear and mature, the removed waste concrete is conveyed to a recycling plant of recycled broken materials after being primarily crushed on site, coarse aggregate (broken stone) and powder (broken sand and cement paste materials) are obtained through fine crushing, wherein the coarse aggregate is mixed into fresh concrete to prepare concrete, and the powder is mixed into base material to build a base.
Chinese patent application publication No. CN 110156409A discloses a sludge-containing concrete and a preparation method thereof, cement, sludge, fly ash, basalt macadam, river sand, polypropylene fiber and a nano reinforcing agent are added into a concrete mixer to be uniformly mixed, then mixed liquid is added to be uniformly mixed, and the strength of the concrete is about 30-35 MPa. Chinese patent No. CN 103755267B discloses a silt concrete and a preparation method thereof, wherein the silt concrete comprises cement, water, stones, fly ash, mineral powder, sand and an additive, silt is adopted to replace part of the sand as fine aggregate, and the final strength is about 35MPa. Chinese patent application publication No. CN 108558337A discloses a method for preparing organic active concrete by modifying and modifying sludge, wherein the sludge is deodorized and then reacts with an organic synthetic curing agent, and the modified sludge, portland cement, fly ash and the like are mixed to obtain the organic active concrete. The concrete obtained by the 3 patent technologies has low strength, less silt participation, higher cost compared with common C30 concrete, lower added value and poor market competitiveness.
Chinese patent application publication No. 114436601A discloses recycled aggregate self-compacting concrete and a preparation method thereof, waste concrete is crushed, sorted and screened to prepare aggregate particles; uniformly mixing water glass, PVA, nano-silica, phosphoric acid and water to prepare composite liquid, and putting aggregate particles into the composite liquid for soaking; placing the aggregate particles soaked in the composite liquid in a closed container, vacuumizing, introducing carbon dioxide gas, boosting the pressure to 0.1-0.4MPa, and maintaining the pressure for 20-24h to prepare reinforced aggregate particles; the reinforced aggregate particles are soaked in the water-based organic silicon resin emulsion, dried and finally stirred to form the self-compacting concrete, and the self-compacting concrete has the advantages of compact structure, high mechanical strength and strong frost resistance. Chinese patent No. CN113024199B discloses recycled concrete prepared by utilizing waste building concrete and a preparation method thereof, wherein the preparation method comprises the following steps: 1) Crushing, cleaning and screening the waste building concrete to obtain recycled aggregate; 2) Mixing the recycled aggregate with magnesium sulfate, lithium carbonate, sodium sulfate and potassium dihydrogen phosphate to obtain a mixture; 3) The mixture is mixed with a cementing material, a coarse aggregate, a fine aggregate, an additive, a synergist and water to obtain recycled concrete prepared from waste building concrete, so that the impermeability of the concrete is improved, and the concrete has better crack resistance. The 2 patents have more materials and complicated manufacturing process, and still do not get rid of the convention of treating coarse aggregates and fine aggregates differently, the coarse aggregates after screening are divided into three types of 20-30cm, 10-20cm and 5-10cm, and the coarse aggregates are respectively added into concrete of different grades and are not generally added into one type of concrete at the same time; the fine aggregate cannot be added into concrete and is generally added into a base layer (degraded), so that a large amount of powder can be only used for low-grade buildings such as base layers, mortar and the like.
In a word, in the prior art, the sludge at the bottom of rivers and lakes or the waste concrete are rarely used in a combined way, and the maximized green application of the construction wastes such as the sludge and the waste concrete in construction engineering and highway engineering is not realized.
Disclosure of Invention
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a method for preparing green concrete based on sludge and waste concrete includes the steps of:
step S1, sludge pretreatment
Stirring the sludge and the quicklime, standing, drying and grinding to obtain treated sludge, and dividing the treated sludge into two parts, namely a part A and a part B;
s2, crushing waste concrete
Removing impurities in the waste concrete, and crushing and screening the waste concrete to obtain regenerated coarse aggregate and regenerated fine aggregate;
step S3, recycled fine aggregate treatment
Fully mixing the recycled fine aggregate obtained in the step S2, the part A of the sludge obtained by the pretreatment in the step S1 and metakaolin, and mixing and stirring the mixture and water;
step S4, recycled coarse aggregate treatment
Spraying water on the recycled coarse aggregate obtained in the step S2 to enable the recycled coarse aggregate to be in a saturated surface dry state;
step S5, preparing green concrete
And (3) mixing and stirring the recycled coarse aggregate obtained by the step (S4), the part B of the recycled fine aggregate obtained by the step (S3), the sludge obtained by the step (S1), cement, water and a water reducing agent, and finally obtaining the target product, namely the green concrete.
Preferably, in the step S1, the sludge and the quicklime are stirred, and are left to stand, dry and ground, specifically including the following operations:
and (3) sieving the sludge, mixing and stirring the sieved sludge and quicklime according to the weight ratio of 100-16, standing and drying, and grinding to 0.08mm for later use after drying.
Preferably, in the step S2, the impurities in the waste concrete are removed, and the waste concrete is crushed to obtain the recycled coarse aggregate and the recycled fine aggregate, and the method specifically includes the following operations:
s21, carrying out primary crushing on the waste concrete, and cleaning impurities in the waste concrete;
s22, continuously carrying out secondary crushing to obtain a mixture with the diameter of less than 35 cm;
and step S23, further screening the mixture obtained in the step S22 to respectively obtain recycled coarse aggregate and recycled fine aggregate.
Preferably, in the step S3, the recycled fine aggregate obtained in the step S2, the part a of the sludge pretreated in the step S1 and the metakaolin are fully mixed, and then the mixture is mixed with water, and the operation specifically includes the following steps:
step S31, mixing the recycled fine aggregate obtained in the step S2, the sludge obtained by pretreatment in the step S1, metakaolin and cement according to a mass ratio of 100-10;
and S32, mixing and stirring the mixture and water according to a mass ratio of 100 to 1-4, wherein the water is added in a stirring and spraying manner until the water is added, and maintaining for at least 7d for later use.
Preferably, in the step S5, the recycled coarse aggregate obtained by the step S4 in the part B, the recycled fine aggregate obtained by the step S3, the sludge obtained by the step S1, cement, water and a water reducing agent are mixed and stirred to finally obtain the target product, namely green concrete, and the method specifically comprises the following steps;
step S51, fully stirring the recycled coarse aggregate obtained in the step S4 and the recycled fine aggregate obtained in the step S3;
step S52, continuously adding the sludge obtained by the step S1, and fully stirring;
step S53, adding water and a water reducing agent, and fully stirring to finally obtain a target product, namely green concrete;
wherein the weight ratio of the recycled coarse aggregate obtained by the step S4, the recycled fine aggregate obtained by the step S3, the sludge obtained by the step S1, the cement, the water and the water reducing agent is 65-75.
Preferably, the cement is ultra-fine cement, wherein the median particle diameter D50 is less than 1um, the maximum particle diameter is less than 18um, and more than 80 percent of particles have the size of less than 5 um.
Preferably, the water reducing agent is a mud-resistant high-efficiency water reducing agent.
Preferably, the metakaolin is obtained by grinding kaolinite and then calcining at 600-900 ℃, and the fineness is 4000-18000m 2 /Kg。
Preferably, the weight ratio of part a to part B is 100: (50-200).
The invention at least comprises the following beneficial effects:
(1) The invention adopts a large amount of waste concrete, sludge in rivers, lakes and seas and other wastes as raw materials, consumes a large amount of construction wastes, realizes the resource recycling of the construction wastes, reduces the high energy consumption generated by the traditional method, is a green regeneration and recycling technology, can be used for rural cement concrete pavements, low-grade roads and non-mechanism concrete, has wide application prospect and considerable benefits.
(2) The invention solves the problems of low added value, high energy consumption, strong market competition and need of downstream engineering acceptance in the traditional technology (such as haydite, brick making and roadbed), realizes the maximization of the value of the construction waste and has obvious economic benefit.
(3) According to the invention, the expansion components (if a small amount of calcined metakaolin is added in some cases) in the sludge are used for dry mixing and filling the gaps of the regenerated fine aggregate, and the expansion of the expansion components in the gaps is realized by a small amount of water spraying manner so as to provide expansion force, so that the tight filling of the gaps of the fine aggregate is realized, and the problem of low strength of the regenerated fine aggregate is effectively improved.
(4) The waste concrete is fully graded, the condition that fine aggregates are used for a base course in the traditional utilization mode is avoided, and the repeated transportation cost and the loss of added value of degraded material in the process are reduced.
(5) The concrete prepared by the method can consume about 40% of waste concrete and more than 5% of sludge under the condition of ensuring that the strength of the concrete is not lower than 30MPa, and compared with the common C30 concrete, the method saves 45% of new construction materials.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Example 1:
(1) Pretreatment of sludge:
after filtering the river, lake and sea dredging sediment by a 10cm screen, adding 6 parts of quicklime into every 100 parts of sediment (water weight), stirring, standing for 2 days, drying, grinding to be below 0.08mm for later use, and dividing the powder into two parts, namely an A part and a B part.
(2) Crushing of waste concrete
1) Primarily crushing waste concrete, and cleaning sundries such as reinforcing steel bars and the like;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by using a 5mm square-hole sieve to respectively obtain the recycled coarse aggregate and the recycled fine aggregate.
(3) Recycled fine aggregate treatment
1) Mixing the recycled fine aggregate with the part A of the pretreated sludge obtained in the step (1) according to the ratio of the fine aggregate: sludge: cement =100, and the ratio of;
2) And (3) stirring the mixture and water according to the proportion of 100, adding the water in a spraying manner while stirring until the water is added, and maintaining for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
And spraying water on the recycled coarse aggregate to ensure that the recycled coarse aggregate is in a saturated surface dry state.
(5) Preparation of Green concrete
And (3) stirring the recycled coarse aggregate in the step (4), the common aggregate, the recycled fine aggregate in the step (3), the part B of the pretreated sludge in the step (1), cement, water and a water reducing agent according to the following ratio of 65.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, and the full-graded waste concrete consumed by the embodiment accounts for about 40.3 percent of the total weight, the absolute dry sludge accounts for about 5.9 percent of the total weight, and the compressive strength is about 39.5MPa.
Example 2:
(1) Pretreatment of sludge:
after the river, lake and sea dredging sediment is filtered by a 10cm screen, 16 parts of quicklime is added to each 100 parts of sediment (water content), the mixture is stirred and then stands for 4 days, and after being dried, the mixture is ground to be below 0.08mm for later use and is divided into two parts, namely an A part and a B part.
(2) Crushing waste concrete
1) Primarily crushing waste concrete, and cleaning sundries such as reinforcing steel bars;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by using a 5mm square-hole sieve to respectively obtain the recycled coarse aggregate and the recycled fine aggregate.
(3) Recycled fine aggregate treatment
1) Mixing the recycled fine aggregate with the part A of the pretreated sludge obtained in the step (1) according to the ratio of the fine aggregate: sludge: metakaolin: cement =100, 5;
2) And (3) stirring the mixture and water according to the proportion of 100, adding the water in a spraying manner while stirring until the water is added, and maintaining for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
And spraying water on the recycled coarse aggregate to ensure that the recycled coarse aggregate is in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate in the step (4), the common aggregate, the recycled fine aggregate in the step (3), the part B of the pretreated sludge in the step (1), cement, water and a water reducing agent according to the ratio of 75.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, and the full-graded waste concrete consumed by the embodiment accounts for about 43.4 percent of the total weight, the absolute dry sludge accounts for about 7.6 percent of the total weight, and the compressive strength is about 30.4MPa.
Example 3:
(1) Pretreatment of sludge:
after the dredging bottom sludge of rivers, lakes and seas is filtered by a 10cm screen, 10 parts of quicklime is added to every 100 parts of sludge (water content weight), the mixture is stirred and then stands for 4 days, and after being dried, the mixture is ground to be below 0.08mm for later use and is divided into two parts, namely a part A and a part B.
(2) Crushing waste concrete
1) Primarily crushing waste concrete, and cleaning sundries such as reinforcing steel bars and the like;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by using a 5mm square-hole sieve to respectively obtain the recycled coarse aggregate and the recycled fine aggregate.
(3) Recycled fine aggregate treatment
1) Mixing the recycled fine aggregate with the part A of the pretreated sludge obtained in the step (1) according to the ratio of the fine aggregate: sludge: metakaolin: cement = 100;
2) And (3) stirring the mixture and water according to the proportion of 100, adding the water in a spraying manner while stirring until the water is added, and maintaining for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
And spraying water on the recycled coarse aggregate to ensure that the recycled coarse aggregate is in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate in the step (4), the common aggregate, the recycled fine aggregate in the step (3), the part B of the pretreated sludge in the step (1), cement, water and a water reducing agent according to the ratio of 70.
Finally, green concrete containing silt and full-grade waste concrete is prepared, and the full-grade waste concrete consumed by the embodiment accounts for about 41.9 percent of the total weight, about 8.8 percent of the total weight of absolutely dry silt and about 31.2MPa of compressive strength.
Example 4:
(1) Pretreatment of sludge:
after the dredging bottom sludge of rivers, lakes and seas is filtered by a 10cm screen, 10 parts of quicklime is added to every 100 parts of sludge (water content weight), the mixture is stirred and then stands for 5 days, and after being dried, the mixture is ground to be below 0.08mm for later use and is divided into two parts, namely a part A and a part B.
(2) Crushing of waste concrete
1) Primarily crushing waste concrete, and cleaning sundries such as reinforcing steel bars and the like;
2) Carrying out secondary crushing on the waste concrete to obtain a mixture with the diameter of less than 35 cm;
3) And screening the mixture by using a 5mm square-hole sieve to respectively obtain the recycled coarse aggregate and the recycled fine aggregate.
(3) Recycled fine aggregate treatment
1) Mixing the recycled fine aggregate with the part A of the pretreated sludge obtained in the step (1) according to the ratio of the fine aggregate: sludge: metakaolin: cement = 100;
2) And (3) stirring the mixture and water according to the proportion of 100, adding the water in a spraying manner while stirring until the water is added, and maintaining for at least 7d for later use.
(4) Treatment of recycled coarse aggregate
And spraying water on the recycled coarse aggregate to ensure that the recycled coarse aggregate is in a saturated surface dry state.
(5) Preparation of green concrete
Stirring the recycled coarse aggregate in the step (4), the common aggregate, the recycled fine aggregate in the step (3), the part B of the pretreated sludge in the step (1), cement, water and a water reducing agent according to the ratio of 70.
Finally, the green concrete containing the sludge and the full-graded waste concrete is prepared, and the full-graded waste concrete consumed by the embodiment accounts for about 41.1 percent of the total weight, the absolute dry sludge accounts for about 7.1 percent of the total weight, and the compressive strength is about 34.1MPa.
In summary, it can be seen from the data of examples 1 to 4 that the concrete prepared by the invention can consume about 40% of waste concrete and more than 5% of sludge under the condition that the strength of the concrete is not lower than 30MPa, which is equivalent to that of common C30 concrete, and the method saves 45% of building materials and has good application prospect.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, particular embodiments, but rather to those skilled in the art, and it is to be understood that the invention is capable of numerous modifications and that various changes may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
1. A preparation method of green concrete based on sludge and waste concrete is characterized by comprising the following steps:
step S1, sludge pretreatment
Stirring the sludge and the quicklime, standing, drying and grinding to obtain treated sludge, and dividing the treated sludge into two parts, namely a part A and a part B;
s2, crushing waste concrete
Removing impurities in the waste concrete, and crushing and screening the waste concrete to obtain regenerated coarse aggregate and regenerated fine aggregate;
step S3, recycled fine aggregate treatment
Fully mixing the recycled fine aggregate obtained in the step S2, the part A of the sludge obtained by the pretreatment in the step S1, metakaolin and cement, and mixing and stirring the mixture and water;
step S4, recycled coarse aggregate treatment
Spraying water on the recycled coarse aggregate obtained in the step S2 to enable the recycled coarse aggregate to be in a saturated surface dry state;
step S5, preparing green concrete
And (3) mixing and stirring the recycled coarse aggregate obtained by the step (S4), the recycled fine aggregate obtained by the step (S3), the part B of the sludge obtained by the step (S1), cement, water and a water reducing agent, and finally obtaining the target product, namely the green concrete.
2. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the step S1 of stirring sludge and quicklime, standing, drying and grinding comprises the following operations:
and (3) sieving the sludge, mixing and stirring the sieved sludge and quicklime according to the weight ratio of 100-16, standing and drying, and grinding to 0.08mm for later use after drying.
3. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the step S2 is to remove impurities in the waste concrete and crush the waste concrete to obtain recycled coarse aggregate and recycled fine aggregate, and comprises the following steps:
s21, performing primary crushing on the waste concrete, and cleaning sundries in the waste concrete;
s22, continuously carrying out secondary crushing to obtain a mixture with the diameter of less than 35 cm;
and step S23, further screening the mixture obtained in the step S22 to respectively obtain recycled coarse aggregate and recycled fine aggregate.
4. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the step S3 is to fully mix the recycled fine aggregate obtained in the step S2, the part A of the sludge pretreated in the step S1 and metakaolin, and mix the mixture with water, and the method comprises the following steps:
step S31, mixing the recycled fine aggregate obtained in the step S2, the sludge obtained by pretreatment in the step S1, metakaolin and cement according to a mass ratio of 100-10;
and S32, mixing and stirring the mixture and water according to a mass ratio of 100 to 1-4, wherein the water is added in a stirring and spraying manner until the water is added, and maintaining for at least 7d for later use.
5. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the step S5 of mixing and stirring the recycled coarse aggregate obtained by the step S4, the recycled fine aggregate obtained by the step S3, the part B of the sludge obtained by the step S1, cement, water and water reducer to finally obtain the green concrete of the target product comprises the following steps;
step S51, fully stirring the recycled coarse aggregate obtained in the step S4 and the recycled fine aggregate obtained in the step S3;
step S52, continuously adding the sludge obtained by the treatment in the step S1, and fully stirring;
step S53, adding water and a water reducing agent, and fully stirring to finally obtain a target product, namely green concrete;
wherein the recycled coarse aggregate obtained by the step S4, the recycled fine aggregate obtained by the step S3, the part B of the sludge obtained by the step S1 and the weight ratio of cement, water and water reducing agent is 65-75.
6. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the cement is ultra-fine cement, the median particle diameter D50 is below 1um, the maximum particle diameter is no more than 18um, and the particle size is 5um or less when more than 80%.
7. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the water reducing agent is a high-efficiency water reducing agent of sludge resistance type.
8. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the metakaolin is obtained by grinding kaolinite and then calcining at 600-900 ℃ and has the fineness of 4000-18000m 2 /Kg。
9. The method for preparing green concrete based on sludge and waste concrete according to claim 1, wherein the weight ratio of the part a and the part B is 100: (50-200).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211011655.XA CN115594446B (en) | 2022-08-23 | 2022-08-23 | Preparation method of green concrete based on sludge and waste concrete |
| PCT/CN2023/082691 WO2024040952A1 (en) | 2022-08-23 | 2023-03-21 | Sludge and waste concrete-based green concrete preparation method |
| LU506954A LU506954B1 (en) | 2022-08-23 | 2023-03-21 | Production of green concrete products with natural mud and waste concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211011655.XA CN115594446B (en) | 2022-08-23 | 2022-08-23 | Preparation method of green concrete based on sludge and waste concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115594446A true CN115594446A (en) | 2023-01-13 |
| CN115594446B CN115594446B (en) | 2024-04-26 |
Family
ID=84843454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211011655.XA Active CN115594446B (en) | 2022-08-23 | 2022-08-23 | Preparation method of green concrete based on sludge and waste concrete |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN115594446B (en) |
| LU (1) | LU506954B1 (en) |
| WO (1) | WO2024040952A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117303842A (en) * | 2023-08-15 | 2023-12-29 | 南京交通职业技术学院 | Brick making formula, technology and application based on dredging sludge |
| WO2024040952A1 (en) * | 2022-08-23 | 2024-02-29 | 中交特种工程有限公司 | Sludge and waste concrete-based green concrete preparation method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1944324A (en) * | 2006-10-19 | 2007-04-11 | 上海大学 | Method for treating city ditch mud |
| KR20090093907A (en) * | 2009-07-14 | 2009-09-02 | 경상대학교산학협력단 | Concrete Body consisted of Waste Sludge as a Inorganic Binder using Meta-Kaolin and Manufacturing Method of the Same |
| CN107285686A (en) * | 2017-08-01 | 2017-10-24 | 上海市建筑科学研究院 | A kind of environmentally friendly full-transparency type pervious concrete based on discarded concrete and preparation method thereof |
| CN111978056A (en) * | 2020-08-27 | 2020-11-24 | 中国建筑材料科学研究总院有限公司 | Modified material of low-quality aggregate and treatment method |
| AU2020103163A4 (en) * | 2020-11-02 | 2021-01-14 | Tongji University | A Fully Recycled Concrete Wave-proof Block Using Large-particle-size Recycled Coarse Aggregate and Recycled Powder and Preparation Method Thereof |
| CN113087427A (en) * | 2021-03-12 | 2021-07-09 | 中国地质大学（武汉） | Recycled aggregate soaked based on metakaolin slurry and modification method thereof |
| CN113149585A (en) * | 2021-02-08 | 2021-07-23 | 武汉二航路桥特种工程有限责任公司 | Ultrahigh-performance concrete containing silt artificial sandstone and preparation method thereof |
| CN113336491A (en) * | 2021-07-07 | 2021-09-03 | 上海市建筑科学研究院有限公司 | Concrete doped with ditch-dredging sludge and used for maritime work bank protection engineering twisted Chinese character 'Wang' block and preparation method thereof |
| CN113979703A (en) * | 2021-11-19 | 2022-01-28 | 中交第二航务工程局有限公司 | Sludge curing agent and curing process thereof |
| CN114195460A (en) * | 2021-12-29 | 2022-03-18 | 太仓市路桥工程有限公司 | Vibration-pressure-free regenerated cement stabilized macadam |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090049799A (en) * | 2007-11-14 | 2009-05-19 | 박노일 | Recycling method of construction waste material |
| JP5597467B2 (en) * | 2010-07-23 | 2014-10-01 | 東京電力株式会社 | Manufacturing method of recycled concrete |
| CN112624644B (en) * | 2020-12-01 | 2022-07-22 | 武汉二航路桥特种工程有限责任公司 | Preparation method of functionally gradient type ecological artificial sandstone manufactured by sludge |
| CN112645655A (en) * | 2020-12-23 | 2021-04-13 | 东莞市建业混凝土有限公司 | Green high-performance concrete and preparation method thereof |
| CN113264700B (en) * | 2021-05-25 | 2022-03-01 | 深圳市衡骏环保科技有限公司 | Regenerated cementing material based on subway shield sludge |
| CN115594446B (en) * | 2022-08-23 | 2024-04-26 | 中交特种工程有限公司 | Preparation method of green concrete based on sludge and waste concrete |
-
2022
- 2022-08-23 CN CN202211011655.XA patent/CN115594446B/en active Active
-
2023
- 2023-03-21 LU LU506954A patent/LU506954B1/en active
- 2023-03-21 WO PCT/CN2023/082691 patent/WO2024040952A1/en unknown
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1944324A (en) * | 2006-10-19 | 2007-04-11 | 上海大学 | Method for treating city ditch mud |
| KR20090093907A (en) * | 2009-07-14 | 2009-09-02 | 경상대학교산학협력단 | Concrete Body consisted of Waste Sludge as a Inorganic Binder using Meta-Kaolin and Manufacturing Method of the Same |
| CN107285686A (en) * | 2017-08-01 | 2017-10-24 | 上海市建筑科学研究院 | A kind of environmentally friendly full-transparency type pervious concrete based on discarded concrete and preparation method thereof |
| CN111978056A (en) * | 2020-08-27 | 2020-11-24 | 中国建筑材料科学研究总院有限公司 | Modified material of low-quality aggregate and treatment method |
| AU2020103163A4 (en) * | 2020-11-02 | 2021-01-14 | Tongji University | A Fully Recycled Concrete Wave-proof Block Using Large-particle-size Recycled Coarse Aggregate and Recycled Powder and Preparation Method Thereof |
| CN113149585A (en) * | 2021-02-08 | 2021-07-23 | 武汉二航路桥特种工程有限责任公司 | Ultrahigh-performance concrete containing silt artificial sandstone and preparation method thereof |
| CN113087427A (en) * | 2021-03-12 | 2021-07-09 | 中国地质大学（武汉） | Recycled aggregate soaked based on metakaolin slurry and modification method thereof |
| CN113336491A (en) * | 2021-07-07 | 2021-09-03 | 上海市建筑科学研究院有限公司 | Concrete doped with ditch-dredging sludge and used for maritime work bank protection engineering twisted Chinese character 'Wang' block and preparation method thereof |
| CN113979703A (en) * | 2021-11-19 | 2022-01-28 | 中交第二航务工程局有限公司 | Sludge curing agent and curing process thereof |
| CN114195460A (en) * | 2021-12-29 | 2022-03-18 | 太仓市路桥工程有限公司 | Vibration-pressure-free regenerated cement stabilized macadam |
Non-Patent Citations (1)
| Title |
|---|
| 马新伟等: "《混凝土尺寸稳定性》", 哈尔滨工业大学出版社, pages: 87 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024040952A1 (en) * | 2022-08-23 | 2024-02-29 | 中交特种工程有限公司 | Sludge and waste concrete-based green concrete preparation method |
| CN117303842A (en) * | 2023-08-15 | 2023-12-29 | 南京交通职业技术学院 | Brick making formula, technology and application based on dredging sludge |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024040952A1 (en) | 2024-02-29 |
| CN115594446B (en) | 2024-04-26 |
| LU506954B1 (en) | 2024-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102390963B (en) | Recycled aggregate medium-dry hard concrete prepared by using building waste and preparation method of recycled aggregate medium-dry hard concrete | |
| CN101139193B (en) | Regenerative concrete composite material and method for making same | |
| CN106830777B (en) | The regeneration fill concrete of consumer waste incineration residue preparation and its application | |
| CN115594446B (en) | Preparation method of green concrete based on sludge and waste concrete | |
| CN106477929A (en) | A kind of intensifying regenerating aggregate processing method and intensifying regenerating aggregate concrete | |
| CN106758650A (en) | A kind of novel ecological pervious concrete pavement | |
| CN109053080A (en) | Environmentally friendly high ductility cement-base composite material of one kind and preparation method thereof | |
| CN112194394A (en) | Preparation method of artificial building aggregate based on sludge | |
| CN108774041A (en) | A kind of water-permeable brick and preparation method thereof for making aggregate with artificial carbonization slag bead | |
| CN106007556A (en) | Pumpable high-strength recycled concrete and preparation technology thereof | |
| CN109095800B (en) | Method for preparing ecological aggregate by coating and modifying construction waste | |
| CN114349437B (en) | Method for preparing road material from high-water-content sludge/engineering muck | |
| CN103771776A (en) | Recycled micropowder concrete and preparation method thereof | |
| CN109095799B (en) | Method for preparing ecological aggregate by coating modification of coal gangue | |
| CN108715528A (en) | A kind of permeable pavement brick and preparation method thereof | |
| CN102757208A (en) | Size and method for treating recycled coarse aggregates | |
| CN111574178B (en) | Preparation method of baking-free brick from residual soil and residual mud | |
| CN111153664A (en) | Road base material produced by stabilizing waste concrete building waste aggregate with lime red mud | |
| CN108623247A (en) | A kind of environmentally friendly seepage brick prepared by renewable material of building waste | |
| CN113149585B (en) | Ultrahigh-performance concrete containing silt artificial sandstone and preparation method thereof | |
| CN108689659A (en) | A kind of construction refuse regenerated mixture of cement stabilizing and preparation method thereof | |
| Fan et al. | New applications of municipal solid waste incineration bottom ash (MSWIBA) and calcined clay in construction: Preparation and use of an eco-friendly artificial aggregate | |
| CN109133683B (en) | Comprehensive and integrated utilization method of coal gangue | |
| CN110218036A (en) | The method for preparing regeneration concrete using discarded concrete | |
| CN114163174A (en) | Solid waste base modified cementing material and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Country or region after: China Address after: Room 2101-2104, 21 / F, unit a, block a, Hubei science and technology venture building, Xiaohongshan East District, Wuchang District, Wuhan City, Hubei Province, 430061 Applicant after: CCCC Road & Bridge Special Engineering Co.,Ltd. Address before: Room 2101-2104, 21 / F, unit a, block a, Hubei science and technology venture building, Xiaohongshan East District, Wuchang District, Wuhan City, Hubei Province, 430061 Applicant before: CCCC ROAD & BRIDGE SPECIAL ENGINEERING Co.,Ltd. Country or region before: China |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |