CN114085053A - Waste building residue soil slurry base baking-free early-strength lightweight aggregate and preparation method thereof - Google Patents
Waste building residue soil slurry base baking-free early-strength lightweight aggregate and preparation method thereof Download PDFInfo
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- CN114085053A CN114085053A CN202111330799.7A CN202111330799A CN114085053A CN 114085053 A CN114085053 A CN 114085053A CN 202111330799 A CN202111330799 A CN 202111330799A CN 114085053 A CN114085053 A CN 114085053A
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- 239000002002 slurry Substances 0.000 title claims abstract description 113
- 239000002689 soil Substances 0.000 title claims abstract description 100
- 239000002699 waste material Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 63
- 239000000463 material Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000005469 granulation Methods 0.000 claims abstract description 44
- 230000003179 granulation Effects 0.000 claims abstract description 44
- 239000002994 raw material Substances 0.000 claims description 21
- 238000005520 cutting process Methods 0.000 claims description 19
- 238000005303 weighing Methods 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- 229910021487 silica fume Inorganic materials 0.000 claims description 8
- 238000007580 dry-mixing Methods 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 239000010881 fly ash Substances 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical group [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 230000006911 nucleation Effects 0.000 claims description 4
- 238000010899 nucleation Methods 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 10
- 230000001070 adhesive effect Effects 0.000 abstract description 10
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000004567 concrete Substances 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000001125 extrusion Methods 0.000 description 9
- 230000018044 dehydration Effects 0.000 description 8
- 238000006297 dehydration reaction Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 238000011049 filling Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009818 secondary granulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002351 wastewater 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
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to a waste building residue soil slurry base baking-free early strength type lightweight aggregate and a preparation method thereof. The residue soil slurry after the water content pretreatment and an inorganic cementing material are premixed and dry-mixed in a disc granulator according to a certain proportion, an adhesive and water are added into the mixture, the mixture is uniformly stirred again, granular aggregate is prepared through a disc granulation process or a curing and crushing process, and the aggregate is maintained to obtain the early-strength, light-weight and low-water-absorption waste building residue soil slurry base burn-free early-strength light aggregate. According to the invention, the aggregate for concrete is prepared by recycling waste building muck generated in engineering construction, the production process is green and environment-friendly, and the product forming rate is high. The invention not only can effectively improve the comprehensive utilization efficiency of the waste building resources, but also can greatly shorten the production period of the product, and is suitable for large-scale industrial production and application.
Description
Technical Field
The invention belongs to the technical field of recycling of building waste resources, and relates to a waste building residue soil slurry base baking-free early strength type lightweight aggregate and a preparation method thereof.
Background
With the continuous acceleration of urban infrastructure pace in China, construction of modern building structure engineering generates a large amount of waste building residue soil and waste slurry, so that the construction is difficult to consume and dispose, and engineering construction safety and urban green development are seriously influenced. The method for treating the building residue soil slurry is mainly used for transportation and landfill, is limited in that the residue soil slurry does not have hydration activity, and the resource utilization rate of the residue soil slurry converted into building materials is low. Meanwhile, along with the exhaustion of natural aggregate river sand resources, mother rock resources of machine-made sand aggregates are increasingly scarce, and the problem of scarcity of sand aggregate resources is urgently solved, so that the preparation of aggregates by using building muck slurry is a solid waste resource conversion way for killing two birds with one stone.
At present, research on preparation of aggregate from building residue soil slurry mainly focuses on sintering aggregate, the residue soil slurry generates strength through a sintering process, and the sintered ceramsite is prepared, has the characteristics of light weight, high strength and small heat conductivity coefficient, and therefore, has good effect when being applied to a large number of heat-insulation members. But the energy consumption of the ceramsite sintering process is high, and CO discharged in the sintering process2High yield, and is not favorable for green sustainable development. In response to the carbon neutralization policy set forth by the state, CO reduction2The amount of emissions is of great importance. Therefore, the non-fired aggregate formed by the cold bonding way can realize the waste recycling of the building muck slurry, and the forming process has no CO2The emission of the waste water is more environment-friendly and green. However, the existing technology for preparing the baking-free aggregate from the solid waste residue soil slurry has a plurality of defects, for example, CN201810357695.7 adopts a binding agent and inert aggregate to form ceramsite through disc granulation and extrusion granulation processes, and the problem that the non-lightweight strength of the ceramsite develops slowly exists. For example, in the process of preparing the baking-free lightweight aggregate by using the waste slurry disclosed in CN202011141593.5, the development of the aggregate strength is slow, and the production period is long. In the method for preparing the solid waste base unfired high-strength ceramsite disclosed in CN 202110581195.3, the ceramsite molding process comprises core material preparation and secondary shell wrapping processing, which is too complex and not beneficial to scale production. Most of the processes adopt a small amount of process forming, the maintenance period is long, and the prepared aggregate has low strength and poor performance. Therefore, how to solve the problems of low efficiency, long period and poor performance of the baking-free aggregate molding process is very important.
Disclosure of Invention
The invention aims to provide a waste building residue soil slurry base baking-free early-strength lightweight aggregate and a preparation method thereof, solves the problems of low efficiency, long maintenance period, low resource conversion rate and the like of the traditional process, and is greatly beneficial to solid waste utilization and green sustainable development.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides a waste building residue soil slurry base baking-free early strength type lightweight aggregate which comprises the following raw material components in parts by weight: 70-90 parts of building residue soil slurry particles and 10-30 parts of cementing materials. In addition, the adhesive can also comprise 10-30 parts of mineral admixture and 1-3 parts of adhesive.
Further, the cementing material is selected from one or more of cement and slag. Specifically, the slag is one of S95 or S105.
Furthermore, the adhesive is sodium silicate with a modulus of 0.8-1.4.
Further, the mineral admixture is one or more of fly ash and silica fume.
Further, the building residue soil slurry particles are obtained by dehydrating, drying, crushing and sieving the building residue soil slurry. The specific process can be as follows: the building muck slurry is dehydrated through a screw extruder, the water content of a mud cake obtained after extrusion dehydration is controlled to be 30% -50%, the mud cake is placed in a drying oven, the temperature of the drying oven is controlled to be 80-100 ℃, the drying time is 5-12 h, and the mud cake is crushed through a crusher and then passes through a 0.6mm mesh screen to obtain building muck slurry particles.
The second technical scheme of the invention provides a preparation method of the waste building residue soil slurry base baking-free early strength type lightweight aggregate, which comprises the following steps:
(1) weighing building residue soil slurry particles, a cementing material, a mineral admixture and an adhesive, and carrying out dry mixing to obtain a mixed material;
(2) preparing the aggregate from the mixed material by adopting a disc granulation process or a solidification crushing process, and curing to obtain a target product.
Further, when a disc granulation process is adopted, the method is divided into an initial nucleation stage and a secondary granulation stage, wherein the materials used in the initial nucleation stage are 60-80% of the total amount of the mixed materials, the required water consumption is 10-30% of the total amount of the mixed materials, the granulation speed is 60-80 rpm, and the time is 3-5 min;
the material used in the secondary balling stage is 20-40% of the total amount of the mixed material, the pelleting speed is controlled to be 30-50 rpm, and the pelleting time is 5-10 min.
Further, when a curing and crushing process is adopted, the curing and crushing process is divided into an initial curing stage and a shearing and breaking stage, wherein the water consumption required by the initial curing stage is 30-50% of the total amount of the mixed materials, the shearing and breaking stage adopts a guillotine cutting mode to shear the cured muck slurry into aggregate particles, and the two steps of integral cutting and crushing and grain cutting are adopted.
Furthermore, the thickness of a cutter used for integral cutting is 3-5 mm, and the longest edge of the obtained aggregate cutting block is controlled within 5 cm;
the thickness of a cutter used for crushing and dicing is 1-2 cm, and the longest edge of the obtained small cut block is controlled to be 5-25 mm.
Further, one of steam curing, standard curing or saturated water curing is adopted for curing, wherein the curing temperature in the steam curing process is 40-100 ℃, and the curing time is 12-48 hours;
the curing temperature in the standard curing process is 18-22 ℃, the relative humidity of the environment is 90-100%, and the curing time is at least 3 d;
curing with saturated water at the temperature of 16-22 ℃ for at least 3 d.
The whole is attributed to the pretreatment, granulation and maintenance processes of raw materials
(1) The pretreatment is mainly related to granulation, and the building residue soil slurry is processed into powder which is the same as cement, fly ash and slag to prepare the balls after being dried and ground, which are required by a disc granulation process.
The pretreatment of the crushing process is only simple water content control, the water content is mainly related to rheological property (whether the curing material is added for stirring and mold filling for curing and molding), and the water content has great influence on later strength development, so that the water content of the building muck slurry needs to be strictly controlled.
(2) The two processes correspond to different process steps respectively
Disc granulation process: the treated building residue soil slurry powder, a cementing material (playing a role in hydration to provide strength) and a mineral admixture (light fly ash, silica fume filling effect and chemical activity) are weighed according to a proportion and are mixed uniformly in a dry mode, the mixture is added into a disc granulator, and water is sprayed in the rotation process to prepare spherical particles. The cementing material mainly plays a role in hydration to provide strength, water mainly plays a role in bonding and providing a hydration water source (the water-solid ratio is extremely low, so that the aggregate prepared under the same cementing material has excellent performance), and the same water glass can provide the bonding function and also plays a role in improving the strength (the early strength is facilitated, the solution period is long, and the performance is poor).
Crushing and granulating process: building residue soil slurry, a cementing material and a mineral admixture are added and stirred, and are filled in a mold for solidification and molding (the later cutting is convenient, so that the later cutting is carried out, the 1d of solidification is needed, the initial strength is realized, the cut aggregates can be granulated and are not mutually bonded), the basic principle of the process of crushing and granulating is to cut test blocks by the shearing force of a guillotine (similar to a pair of scissors), and therefore, the two procedures are integral block cutting and crushing and granulating.
(3) Maintenance (directly influencing the development of aggregate properties, solving the problem of long cycle)
Steam curing, saturated water curing and normal-temperature curing are adopted, wherein the steam curing is most beneficial to the development of the performance of the aggregate (within 12h short time and good performance), and the saturated water curing and the normal-temperature curing are basically curing time of 7d
Compared with the prior art, the process for preparing the baking-free early-strength lightweight aggregate by using the building muck and mud base can effectively solve the problem of solid waste accumulation of the building muck and the waste mud, can prepare the baking-free aggregate to relieve the problem of natural aggregate resource exhaustion and the problem of urban machine-made sand mother rock resource shortage, and can solve the problem of high energy consumption and large emission of the traditional sintered aggregate.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the following embodiments, the adopted building residue soil is shallow soil in a coastal area, is sandy residue soil, and has an initial water content of 30-60%; the waste slurry is deep soil for tunnel construction in the coastal region, is clayey soil, and has an initial water content of 70-90%.
Otherwise, unless otherwise specified, all the materials or processing techniques are conventional commercial products or conventional processing techniques in the art.
Example 1
The waste building residue soil slurry base baking-free early strength type lightweight aggregate and the preparation method thereof are specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 30 percent, and the dehydrated building residue soil slurry is used as a raw material. And drying to obtain the dried building residue soil slurry.
Pouring the dried building residue soil slurry into a crusher, controlling the crushing time within 3min, and passing through a 0.6mm mesh screen to obtain a dried and ground building residue soil slurry raw material.
(2) Weighing and mixing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dried and ground building residue soil slurry and 30% of cement by mass fraction. And (3) putting the components into a mixer, and performing dry mixing for 1min to obtain a granulation raw material.
(3) Granulating;
the process of disk rolling granulation and sectional type filling are adopted, 70 percent of total materials are filled in the first stage, the required water consumption is 20 percent of the total materials, the disk granulation speed is 70r/min, and the granulation time is 3 min. And in the second stage, the granulation speed is adjusted to 40r/min, the residual 30 percent of the total filled materials is filled, and the granulation time is 5min, so that the baking-free aggregate is obtained.
(4) Standing;
and standing the baking-free aggregate for 24 hours at the indoor ambient temperature of 26 ℃ and the relative humidity of 50%.
(5) Maintaining;
and (3) placing the standing unfired aggregate into a steam curing box, setting the curing temperature to be 90 ℃, and curing for 24 hours.
The prepared baking-free aggregate has a bulk density of 1119kg/m3The cylinder pressure strength was 11.8MPa, and the water absorption at 1h was 12.57%. The performance of the lightweight aggregate specified in GBT17431.1-2010 specifications is achieved, the period of preparing the baking-free lightweight early-strength aggregate from the building residue soil slurry is shortened to 2 days, and the lightweight early-strength is realized.
Example 2
The waste building residue soil slurry base baking-free early strength type lightweight aggregate and the preparation method thereof are specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 30 percent, and the dehydrated building residue soil slurry is used as a raw material. And drying to obtain the dried building residue soil slurry.
Pouring the dried building residue soil slurry into a crusher, controlling the crushing time within 3min, and passing through a 0.6mm mesh screen to obtain a dried and ground building residue soil slurry raw material.
(2) Weighing and mixing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dried and ground building residue soil slurry, 10% of cement, 11% of S105-grade slag, 5% of silica fume and 4% of fly ash by mass. And (3) putting the components into a mixer, and performing dry mixing for 1min to obtain a granulation raw material.
(3) Granulating;
the process of disk rolling granulation and sectional type filling are adopted, 70 percent of total materials are filled in the first stage, the required water consumption is 20 percent of the total materials, the disk granulation speed is 70r/min, and the granulation time is 3 min. And in the second stage, the granulation speed is adjusted to 40r/min, the residual 30 percent of the total filled materials is filled, and the granulation time is 5min, so that the baking-free aggregate is obtained.
(4) Standing;
and standing the baking-free aggregate for 24 hours at the indoor ambient temperature of 26 ℃ and the relative humidity of 50%.
(5) Maintaining;
and (3) placing the standing unfired aggregate into a steam curing box, setting the curing temperature to be 90 ℃, and curing for 24 hours.
The prepared baking-free aggregate has a bulk density of 1125kg/m3The cylinder pressure strength is 10.1MPa, and the water absorption rate is 14.17% in 1 h. The performance of the lightweight aggregate specified in GBT17431.1-2010 specifications is achieved, the period of preparing the baking-free lightweight early-strength aggregate from the building residue soil slurry is shortened to 2 days, and the lightweight early-strength is realized.
Example 3
The waste building residue soil slurry base baking-free early strength type lightweight aggregate and the preparation method thereof are specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 25 percent, and the dehydrated building residue soil slurry is used as a raw material.
(2) Weighing and curing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dehydrated building residue mud, 10% of cement, 12% of S105-grade slag and 8% of fly ash by mass fraction, and weighing 12% of silica fume in dry weight of the building residue mud as admixture. The components are put into a mixer, the water consumption is 15 percent of the total material without the silica fume, after being stirred for 3min, the mixture is poured into a mould with the size of 100mm multiplied by 10mm to be filled and solidified for 1 day.
(3) Granulating;
and (3) demoulding the solidified soil, putting the demoulded solidified soil into a cutting machine, carrying out primary integral cutting, crushing the whole block into small blocks with the maximum side length not exceeding 5cm, putting the small blocks into a secondary crusher, carrying out micro cutting, and controlling the maximum side length of the cut block aggregate to be 5-25 mm to obtain the building muck slurry baking-free aggregate.
(4) Maintaining;
and placing the building residue soil slurry baking-free aggregate obtained by the crushing and grain-sized dicing process into a steam curing box, wherein the curing temperature is set to 90 ℃, and the curing time is set to 24 hours.
Prepared baking-free aggregate pileThe density was 893kg/m3The cylinder pressure strength is 7.8MPa, and the water absorption rate is 20.90% in 1 h. The process shortens the period of preparing the baking-free lightweight early-strength aggregate from the building residue soil slurry to 2 days, and realizes lightweight early strength.
Example 4
A process for preparing baking-free lightweight early-strength aggregate from building residue soil slurry is specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 25 percent, and the dehydrated building residue soil slurry is used as a raw material.
(2) Weighing and curing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dehydrated building residue soil slurry, 10% of cement, 20% of S105-grade slag and 10% of silica fume in percentage by mass. The components are put into a mixer, the water consumption is 15 percent of the total material without the silica fume, after being stirred for 3min, the mixture is poured into a mould with the size of 100mm multiplied by 10mm to be filled and solidified for 1 day.
(3) Granulating;
and (3) demoulding the solidified soil, putting the demoulded solidified soil into a cutting machine, carrying out primary integral cutting, crushing the whole block into small blocks with the maximum side length not exceeding 5cm, putting the small blocks into a secondary crusher, carrying out micro cutting, and controlling the maximum side length of the cut block aggregate to be 5-25 mm to obtain the building muck slurry baking-free aggregate.
(4) Maintaining;
and placing the building residue soil slurry baking-free aggregate obtained by the crushing and grain-sized dicing process into a steam curing box, wherein the curing temperature is set to 90 ℃, and the curing time is set to 24 hours.
The prepared baking-free aggregate has the bulk density of 889kg/m3The cylinder pressure strength was 7.1MPa, and the water absorption at 1h was 21.18%. The process shortens the period of preparing the baking-free lightweight early-strength aggregate from the building residue soil slurry to 2 days, and realizes lightweight early strength.
Comparative example 1:
compared with example 1, most of them are the same except that the subsequent curing process is omitted.
The waste building residue soil slurry base baking-free early strength type lightweight aggregate and the preparation method thereof are specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 30 percent, and the dehydrated building residue soil slurry is used as a raw material. And drying to obtain the dried building residue soil slurry.
Pouring the dried building residue soil slurry into a crusher, controlling the crushing time within 3min, and passing through a 0.6mm mesh screen to obtain a dried and ground building residue soil slurry raw material.
(2) Weighing and mixing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dried and ground building residue soil slurry and 30% of cement by mass fraction. And (3) putting the components into a mixer, and performing dry mixing for 1min to obtain a granulation raw material.
(3) Granulating;
the process of disk rolling granulation and sectional type filling are adopted, 70 percent of total materials are filled in the first stage, the required water consumption is 20 percent of the total materials, the disk granulation speed is 70r/min, and the granulation time is 3 min. And in the second stage, the granulation speed is adjusted to 40r/min, the residual 30 percent of the total filled materials is filled, and the granulation time is 5min, so that the baking-free aggregate is obtained.
(4) Standing;
and standing the baking-free aggregate for 24 hours at the indoor ambient temperature of 26 ℃ and the relative humidity of 50%.
(5) Maintaining;
and placing the standing unfired aggregate indoors.
The prepared baking-free aggregate has the bulk density of 1123kg/m3The 7d cylinder compressive strength is 8.1MPa, the water absorption rate after 1 hour is 13.17 percent, and the performance is obviously inferior to that of the baking-free aggregate under the steam curing condition of the same example 1.
Comparative example 2
The waste building residue soil slurry base baking-free early strength type lightweight aggregate and the preparation method thereof are specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 30 percent, and the dehydrated building residue soil slurry is used as a raw material. And drying to obtain the dried building residue soil slurry.
Pouring the dried building residue soil slurry into a crusher, controlling the crushing time within 3min, and passing through a 0.6mm mesh screen to obtain a dried and ground building residue soil slurry raw material.
(2) Weighing and mixing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dried and ground building residue soil slurry and 30% of cement by mass fraction. And (3) putting the components into a mixer, and performing dry mixing for 1min to obtain a granulation raw material.
(3) Granulating;
the process of disk rolling granulation and sectional type filling are adopted, 70 percent of total materials are filled in the first stage, the required water consumption is 20 percent of the total materials, the disk granulation speed is 70r/min, and the granulation time is 3 min. And in the second stage, the granulation speed is adjusted to 40r/min, the residual 30 percent of the total filled materials is filled, and the granulation time is 5min, so that the baking-free aggregate is obtained.
(4) Standing;
and standing the baking-free aggregate for 24 hours at the indoor ambient temperature of 26 ℃ and the relative humidity of 50%.
(5) Maintaining;
and curing the standing unfired aggregate by using saturated water, wherein the curing temperature is 20 +/-2 ℃, and the curing time is 7 days.
The prepared baking-free aggregate has the bulk density of 1116kg/m3The 7d cylinder compressive strength is 9.0MPa, the water absorption rate after 1 hour is 13.09 percent, and the performance is obviously inferior to that of the baking-free aggregate under the steam curing condition of the same example 1.
Example 5:
compared with example 1, the adhesive is mostly the same except that the adhesive is newly added.
The waste building residue soil slurry base baking-free early strength type lightweight aggregate and the preparation method thereof are specifically implemented as follows:
(1) building residue soil slurry pretreatment;
after the extrusion dehydration process, the water content of the building residue soil slurry and the waste slurry (the mass ratio is 1:1) is controlled to be about 30 percent, and the dehydrated building residue soil slurry is used as a raw material. And drying to obtain the dried building residue soil slurry.
Pouring the dried building residue soil slurry into a crusher, controlling the crushing time within 3min, and passing through a 0.6mm mesh screen to obtain a dried and ground building residue soil slurry raw material.
(2) Weighing and mixing the components of the baking-free early-strength lightweight aggregate;
weighing 70% of dried and ground building residue soil slurry and 30% of cement by mass fraction. And (3) putting the components into a mixer, and performing dry mixing for 1min to obtain a granulation raw material.
(3) Granulating;
a disc rolling granulation process and sectional type filling are adopted, 70% of total materials are filled in the first stage, the required water consumption is 20% of the total materials, 5% of sodium silicate adhesive with the modulus of 0.9 is mixed, the disc granulation speed is 70r/min, and the granulation time is 3 min. And in the second stage, the granulation speed is adjusted to 40r/min, the residual 30 percent of the total filled materials is filled, and the granulation time is 5min, so that the baking-free aggregate is obtained.
(4) Standing;
and standing the baking-free aggregate for 24 hours at the indoor ambient temperature of 26 ℃ and the relative humidity of 50%.
(5) Maintaining;
and (3) placing the standing unfired aggregate into a steam curing box, setting the curing temperature to be 90 ℃, and curing for 24 hours.
The prepared baking-free aggregate has the bulk density of 1122kg/m3The cylinder compressive strength is 15.2MPa, the water absorption rate for 1 hour is 11.35 percent, and the performance is obviously superior to the performance of the baking-free aggregate without the sodium silicate binder.
The invention relates to a waste building residue soil slurry base baking-free early strength type lightweight aggregate, which is prepared from waste building residue soil slurry, an inorganic cementing material, an adhesive and water. The residue soil slurry after the water content pretreatment and an inorganic cementing material are premixed and dry-mixed in a disc granulator according to a certain proportion, an adhesive and water are added into the mixture, the mixture is uniformly stirred again, granular aggregate is prepared through a disc granulation process or a curing and crushing process, and the aggregate is maintained to obtain the early-strength, light-weight and low-water-absorption waste building residue soil slurry base burn-free early-strength light aggregate. According to the invention, the aggregate for concrete is prepared by recycling waste building muck generated in engineering construction, the production process is green and environment-friendly, and the product forming rate is high. The invention not only can effectively improve the comprehensive utilization efficiency of the waste building resources, but also can greatly shorten the production period of the product, and is suitable for large-scale industrial production and application.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The waste building residue soil slurry base baking-free early strength type lightweight aggregate is characterized by comprising the following raw material components in parts by weight: 70-90 parts of building residue soil slurry particles and 10-30 parts of cementing materials.
2. The waste building muck slurry-based unfired early-strength lightweight aggregate according to claim 1, wherein the cementitious material is selected from one or more of cement and slag.
3. The waste building residue soil slurry base baking-free early strength type lightweight aggregate according to claim 1, characterized by further comprising 1-3 parts of a binder, wherein the binder is sodium silicate with a modulus of 0.8-1.4.
4. The waste building muck slurry-based unfired early-strength lightweight aggregate according to claim 1, further comprising 10-30 parts of a mineral admixture, wherein the mineral admixture is one or more of fly ash and silica fume.
5. The waste building residue soil slurry base baking-free early strength type lightweight aggregate according to claim 1, wherein the building residue soil slurry particles are obtained by dewatering, drying, crushing and sieving building residue soil slurry.
6. The method for preparing the waste building muck slurry-based unfired early-strength lightweight aggregate as claimed in any one of claims 1 to 5, comprising the following steps:
(1) weighing all raw material components, and dry-mixing to obtain a mixed material;
(2) preparing the aggregate from the mixed material by adopting a disc granulation process or a solidification crushing process, and curing to obtain a target product.
7. The preparation method of the waste building muck slurry-based unfired early-strength lightweight aggregate according to claim 6, wherein a disc granulation process is adopted, and the preparation method is divided into an initial nucleation stage and a secondary balling stage, wherein the materials used in the initial nucleation stage are 60-80% of the total amount of the mixed materials, the required water consumption is 10-30% of the total amount of the mixed materials, the granulation speed is 60-80 rpm, and the time is 3-5 min;
the material used in the secondary balling stage is 20-40% of the total amount of the mixed material, the pelleting speed is controlled to be 30-50 rpm, and the pelleting time is 5-10 min.
8. The preparation method of the baking-free early-strength lightweight aggregate based on the waste building residue soil slurry as claimed in claim 6, wherein when a curing and crushing process is adopted, the preparation method is divided into an initial curing stage and a shearing and breaking stage, wherein the water consumption required by the initial curing stage is 30-50% of the total amount of the mixed materials, the shearing and breaking stage adopts a guillotine cutting mode to shear the cured residue soil slurry into aggregate particles, and the preparation method is divided into two steps of integral cutting and crushing and grain cutting.
9. The preparation method of the waste building residue soil slurry base baking-free early strength type lightweight aggregate according to claim 8, wherein the thickness of a cutter used for integral block cutting is 3-5 mm, and the longest edge of the obtained aggregate block cutting is controlled within 5 cm;
the thickness of a cutter used for crushing and dicing is 1-2 cm, and the longest edge of the obtained small cut block is controlled to be 5-25 mm.
10. The preparation method of the waste building muck slurry-based unfired early-strength lightweight aggregate according to claim 6, wherein one of steam curing, standard curing or saturated water curing is adopted for curing, wherein the curing temperature in the steam curing process is 40-100 ℃, and the curing time is 12-48 h;
the curing temperature in the standard curing process is 18-22 ℃, the relative humidity of the environment is 90-100%, and the curing time is at least 3 d;
curing with saturated water at the temperature of 16-22 ℃ for at least 3 d.
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