CN111393099B - Premixed recycled aggregate pervious concrete and preparation method thereof - Google Patents
Premixed recycled aggregate pervious concrete and preparation method thereof Download PDFInfo
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- CN111393099B CN111393099B CN202010185674.9A CN202010185674A CN111393099B CN 111393099 B CN111393099 B CN 111393099B CN 202010185674 A CN202010185674 A CN 202010185674A CN 111393099 B CN111393099 B CN 111393099B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Road Paving Structures (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a ready-mixed recycled aggregate pervious concrete and a preparation method thereof, wherein the concrete comprises the following components in parts by weight: recycled aggregate: 1.02-1.1m under high pressure; cement: 450kg/m for rapid rotation at 250-; carrying out thin-wall high-speed dry-rolling and high-speed dry-rolling on the thin-wall high-speed dry-rolling strip by using the water reducing agent in an amount of 0.7-4.5 kg/m; carrying out high-speed high; water: carrying out high-yield high; pigment: the dosage is 2.5-13.5kg/m for carrying out thin film cultivation. The recycled aggregate is used for the pervious concrete, so that the recycling of the construction waste is realized, the waste is changed into the valuable, and the production cost is reduced. Besides the characteristics of the traditional pervious concrete such as pervious concrete, pervious concrete and the like, the method also solves the problems of high water absorption of the recycled aggregate and difficult control of the water-cement ratio in industrial production. The problem of raise dust pollution that traditional concrete on-the-spot stirring that permeates water arouses is solved, production efficiency has been improved simultaneously, and has effectively guaranteed production quality.
Description
Technical Field
The invention relates to the field of building materials, in particular to a ready-mixed recycled aggregate pervious concrete and a preparation method thereof.
Background
The urban ground surface is gradually covered by impervious materials, and the rainwater resource loss is serious. Meanwhile, with the promotion of sponge city construction and the high-speed development of industrialization, the problem of water resources is increasingly severe.
The urbanization process of China is rapid, the discharge amount of building garbage is increased year by year, and the proportion of renewable components is also continuously improved. Most of the construction wastes are not treated at all and are transported to the suburbs or the periphery of cities for simple landfill or open-air stockpiling, which wastes land and resources and pollutes the environment.
With the increasing population, the demand of sandstone aggregate for the construction industry is continuously increasing. For a long time, as the sandstone aggregate is wide in source, easy to obtain and low in price, the sandstone aggregate is regarded as an inexhaustible raw material and is randomly mined, so that the resource is exhausted, the mountain landslide and the river bed are rerouted, and the natural environment is seriously damaged.
Disclosure of Invention
The invention aims to provide a ready-mixed recycled aggregate pervious concrete and a preparation method thereof, and aims to solve the technical problems that the quantity of sandstone aggregates is limited, sandstone resources are increasingly tense, the recycling rate of construction waste recycled aggregates is low, the water absorption of recycled aggregates is high, and the water-cement ratio is difficult to control during continuous production.
In order to realize the purpose, the invention adopts the following technical scheme: the invention provides a ready-mixed recycled aggregate pervious concrete, which comprises the following components in parts by weight:
recycled aggregate: 1.02-1.1m under high pressure;
cement: 450kg/m for rapid rotation at 250-;
water reducing agent: carrying out the high yield and high yield cultivation with the dosage of 0.7-4.5 kg/m;
additive: carrying out high-yield high;
water: the using amount is 67.5-148.5kg/m for harvesting;
pigment: the dosage is 2.5-13.5kg/m for carrying out thin film cultivation.
Further, the recycled aggregate comprises recycled brick and tile aggregate and recycled concrete aggregate.
Further, the setting time of the concrete is 4 to 6 hours.
Further, the cement is 32.5 portland cement or 42.5 portland cement or 52.5 portland cement.
The invention also provides a preparation method of the ready-mixed recycled aggregate pervious concrete, which comprises the following steps:
step one, determining parameters;
a, aggregate parameters: the bulk density of the recycled aggregate is rho, and the saturated surface dry water absorption is W 1 ；
b, cement dosage: the cement dosage is m c /m³；
c, water-cement ratio: the water-cement ratio is W/C;
step two, preparing materials;
a, aggregate preparation and measurement:
b, calculating the cement dosage;
c, calculating the water consumption for stirring;
and step three, after the aggregate is put into the stirrer, adding 60-75% of water consumption, stirring for about 10s, then adding the cement, the pigment, the additive and the water reducing agent in sequence, stirring for about 20s again, and then adding the residual water consumption.
Further, in the step a, performing a water content test to obtain the relative water content W2 under the natural state; placing the aggregate in a bottom-vented, V-volume container, weighing and adjusting the aggregate mass to m1= ρ V × (1 + W2); the aggregate in the water spraying container is sprayed 4-24 hours before use, the weight is weighed within 20min before production to obtain the mass m2, and the water content W is calculated 3 = m 2 /ρV-1；
Further, in the step b, the using amount of the cement is m c ×V。
Further, in the step c, the calculation formula of the stirring water consumption is as follows: w w =m c ×V×W/C+ρV×（W 1 -W 3 ）。
Further, after the concrete is hardened, watering and curing are carried out for 14-21 days.
Furthermore, in the third step, the stirring time is less than or equal to 90 s.
The invention has the beneficial effects that:
the ready-mixed recycled aggregate pervious concrete and the preparation method thereof provided by the invention have all the characteristics of water permeability, air permeability, heat island effect alleviation and the like of the traditional pervious concrete, and also solve the problems of high water absorption of the recycled aggregate and difficulty in controlling the water-cement ratio during industrial production.
2, the ready-mixed recycled aggregate pervious concrete and the preparation method thereof provided by the invention solve the problem of dust pollution caused by field stirring of the traditional pervious concrete, improve the production efficiency and effectively ensure the production quality.
And 3, the recycled aggregate is used for the pervious concrete, so that the recycling of the construction waste is realized, the waste is changed into the valuable, and the production cost is reduced.
4, the invention uses the recycled aggregate for the pervious concrete pavement, can solve the problems of disposal and consumption of construction waste, and can relieve the situation that the sandstone resources in China are increasingly tense.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Detailed Description
The technical solutions of the present invention are described in detail by the following examples, which are merely exemplary and can be used only for explaining and illustrating the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
The spongy transformation of old communities is an effective way to relieve urban inland inundation, but because of the reasons of traffic, environmental protection, building density and the like, a production mode of stirring pervious concrete on site cannot be adopted, and the premixing of the pervious concrete is imperative.
Example 1
The ready-mixed recycled aggregate pervious concrete comprises the following components in parts by weight:
recycled aggregate: 1.02-1.1m under high pressure; the recycled aggregate adopts a secondary weighing method, and comprises recycled brick and tile aggregate and recycled concrete aggregate.
Cement: 450kg/m in weight; the cement is 32.5 ordinary portland cement or 42.5 ordinary portland cement or 52.5 ordinary portland cement.
Water reducing agent: carrying out the high yield and high yield cultivation with the dosage of 0.7-4.5 kg/m; the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Additive with retarding effect: carrying out high-yield high; the setting time is 4-6 hours.
Water: carrying out high-yield high; the amount of water used does not include the saturated water absorption of the recycled aggregate. The calculation of water consumption in actual production comprises two parts:
1, carrying out heavy planting at 67.5-148.5kg/m according to the water-cement ratio.
And 2, the saturated surface dry water content of the recycled aggregate.
Pigment: the dosage is 2.5-13.5kg/m for carrying out thin film cultivation.
The preparation method of the ready-mixed recycled aggregate pervious concrete comprises the following steps:
step one, parameter determination;
a, aggregate parameters: the bulk density of the recycled aggregate is rho, and the saturated surface dry water absorption is W 1 ；
b, cement dosage: the cement dosage is m c /m³；
c, water-cement ratio: the water-cement ratio is W/C;
step two, preparing materials;
a, aggregate preparation and measurement: in the step a, a water content test is carried out to obtain the relative water content W under the natural state 2 (ii) a The aggregates were placed in a bottom-vented, V-volume container, weighed and adjusted to a mass of m1= ρ V × (1 + W) 2 ) (ii) a The aggregate in the water spraying container is sprayed 4-24 hours before use, and the weight is weighed within 20min before production to obtain the mass m 2 Calculating the water content W 3 = m 2 /ρV-1；
b, calculating the cement dosage; the cement dosage is m c ×V。
c, calculating the water consumption for stirring; the formula is as follows: w w =m c ×V×W/C+ρV×（W 1 -W 3 ）。
And step three, concrete stirring adopts a cement stone wrapping method, after the aggregate is placed into the stirring machine, 60-75% of water consumption is added, after the stirring is carried out for about 10s, the cement, the pigment, the additive and the water reducing agent are sequentially added, and after the stirring is carried out for about 20s, the residual water consumption is added. The stirring time is less than or equal to 90 s. Setting time: the setting time of the ready-mixed recycled aggregate pervious concrete is 3-6 hours.
Forming and maintaining: the forming process of the ready-mixed recycled aggregate pervious concrete pavement is the same as that of the traditional pervious concrete pavement, a plastic film is required to cover the pavement after the pavement is constructed, and the concrete is cured by sprinkling water for 14 to 21 days, preferably 21 days.
The pervious concrete provided by the invention adopts recycled concrete and recycled tiles as aggregates, the aggregates are metered by a secondary weighing method, the actual production water consumption calculation comprises the saturated water absorption of the recycled aggregates, and the coagulation time of the concrete mixture is adjusted to 4-6 hours by the additive with a retarding effect. In addition, the mixing time of the concrete is not more than 90s, the pavement forming process is the same as the forming process of the traditional pervious concrete pavement, a plastic film is required to cover the pavement after the pavement construction is finished, and the concrete is sprayed with water for curing for 14 to 21 days, preferably 21 days after being hardened.
Example 2
1. Parameter determination
(a) Aggregate parameters: the bulk density of the recycled clay brick aggregate is 960.5kg/m through high-speed plantation, and the water absorption rate is 11.8%.
(b) The cement dosage is as follows: carrying out cement consumption 400 kg/m;
(c) water-cement ratio: the water-cement ratio is 0.3;
2. aggregate preparation metering
The water content test is carried out, and the relative water content under the natural state is 0.9 percent.
The aggregate was placed in a bottom ventilated container, volume 1m, and weighed and adjusted to 969.1 kg.
The aggregates in the container were sprinkled 4 hours before use, weighed 10min before production to give 1061.4kg of mass, calculated as 10.5% moisture content.
3. Amount of cement used
The cement dosage is 400 kg.
4. Calculation of water consumption for stirring
The amount of water used for stirring was calculated by the formula 132.5 kg.
5. Stirring process
The concrete stirring adopts a cement stone-wrapping method, 86kg of water is added after the aggregate is put into a stirrer, the cement, the pigment, the additive and the water reducing agent are added after the aggregate is stirred for 10s, 46.5kg of water is added after the aggregate is stirred for 20s again, and the total stirring time is 70 s.
6. Coagulation time
The setting time of the ready-mixed recycled aggregate pervious concrete is 5 hours.
7. Molding and curing
The molding of the ready-mixed recycled aggregate pervious concrete pavement is the same as that of the traditional pervious concrete pavement, a plastic film is required to cover the pavement after the pavement construction is finished, and the pavement is watered and maintained for 21 days after the concrete is hardened.
8. Performance indexes are as follows: the 28-day compressive strength is 13.5 MPa;
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (4)
1. The preparation method of the ready-mixed recycled aggregate pervious concrete is characterized in that the concrete comprises the following components in parts by weight:
recycled aggregate: 1.02-1.1m under high pressure;
cement: 450kg/m for rapid rotation at 250-;
water reducing agent: carrying out the high yield and high yield cultivation with the dosage of 0.7-4.5 kg/m;
additive: carrying out high-yield high;
water: carrying out high-yield high;
pigment: carrying out the high yield and high yield cultivation with the dosage of 2.5-13.5 kg/m; the recycled aggregate comprises recycled brick and tile aggregate and recycled concrete aggregate; setting time of the concrete is 4-6 hours;
the method comprises the following steps:
step one, determining parameters;
a, aggregate parameters: pile of recycled aggregateBulk density is rho, saturated surface dry water absorption is W 1 ；
b, cement dosage: the cement dosage is m c /m³；
c, water-cement ratio: the water-cement ratio is W/C;
step two, preparing materials;
a, aggregate preparation and measurement:
b, calculating the cement dosage;
c, calculating the water consumption for stirring;
in the step a, performing a water content test to obtain the relative water content W in a natural state 2 (ii) a Placing the aggregate in a container with the bottom being ventilated and the volume being V, weighing and adjusting the mass of the aggregate to be m 1 =ρV×（1+ W 2 ) (ii) a Sprinkling the aggregate in the container 4-24 hours before use, weighing within 20min before production to obtain mass m 2 Calculating the water content W 3 = m 2 /ρV-1；
In the step b, the using amount of the cement is m c ×V；
In the step two, the calculation formula of the stirring water consumption is as follows: ww = m c ×V×W/C+ρV×（W 1 -W 3 ）；
And step three, after the aggregate is put into the stirrer, adding 60-75% of water consumption, stirring for 10s, then adding the cement, the pigment, the additive and the water reducing agent in sequence, stirring for 20s again, and then adding the residual water consumption.
2. The method of claim 1, wherein the concrete is cured by sprinkling water for 14 to 21 days after hardening.
3. The method of claim 1, wherein in step three, the stirring time is 90s or less.
4. The method of claim 1, wherein the cement is 32.5 Portland cement or 42.5 Portland cement or 52.5 Portland cement.
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| CN201911274833 | 2019-12-12 | ||
| CN2019112748336 | 2019-12-12 |
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| CN111393099B true CN111393099B (en) | 2022-08-30 |
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| CN107188495A (en) * | 2017-06-30 | 2017-09-22 | 华南理工大学 | A kind of mixing proportion design method using full recycled fine aggregate concrete batching |
| CN107445544A (en) * | 2017-08-04 | 2017-12-08 | 西安汉河环保科技有限公司 | A kind of pervious concrete and preparation method thereof |
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- 2020-03-17 CN CN202010185674.9A patent/CN111393099B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20060131617A (en) * | 2005-06-16 | 2006-12-20 | (주)명강산업개발 | Pavement with water permeability concrete including a granule reproduction aggregate and polymer cement |
| CN101407390A (en) * | 2008-10-28 | 2009-04-15 | 浙江大学宁波理工学院 | Porous cement concrete using regenerative concrete aggregate |
| CN104030640A (en) * | 2014-06-25 | 2014-09-10 | 扬州大学 | Pervious concrete of recycled aggregate and preparation method thereof |
| CN106227976A (en) * | 2016-08-04 | 2016-12-14 | 山东交通学院 | A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete |
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