CN114890701B - Environment-friendly economical ceramsite for plateau building concrete and preparation method and application thereof - Google Patents
Environment-friendly economical ceramsite for plateau building concrete and preparation method and application thereof Download PDFInfo
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- CN114890701B CN114890701B CN202210501828.XA CN202210501828A CN114890701B CN 114890701 B CN114890701 B CN 114890701B CN 202210501828 A CN202210501828 A CN 202210501828A CN 114890701 B CN114890701 B CN 114890701B
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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
- 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
- C04B18/027—Lightweight materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses an environment-friendly economical ceramsite for plateau building concrete and a preparation method and application thereof, wherein the environment-friendly economical ceramsite comprises the following raw materials in parts by weight: 50 to 70 portions of recycled concrete, 10 to 30 portions of loess, 5 to 15 portions of phosphogypsum, 5 to 10 portions of S105-level granulated blast furnace slag, 5 to 10 portions of foaming agent and 10 to 15 portions of fluxing agent. The ceramsite disclosed by the invention can meet the requirement of constructional engineering on strength, has stronger frost resistance, is suitable for being used in the traditional building improvement and transformation of plateau, can be used as aggregate to prepare concrete, forms good gradation, can effectively increase the strength of the concrete, reduces the weight and improves the durability of the concrete, and the preparation method is mixing molding at normal temperature and normal pressure, is simple in process procedure, and is beneficial to reducing energy consumption and protecting the environment.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to environment-friendly economical ceramsite for plateau building concrete, and a preparation method and application thereof.
Background
The raw soil building refers to a construction activity which takes raw soil materials which are not sintered as main materials. Since ancient times, raw soil is a global building material, and because of the convenience of local materials, low cost and good thermal properties, more than 1/4 of people live in the raw soil residences in the world today. The method is influenced by the acquisition way of the residential building materials, and the raw soil buildings are mainly distributed in rich soil, have hard soil texture and good caking property and are suitable for building zones of houses. The traditional bearing wall body of the raw soil building is a rammed soil wall or a adobe wall, and the wall body is gradually collected from the lower part to the top.
The development of comprehensive utilization of resources is an important content for deeply implementing sustainable development strategy in China. At present, the amount of bulk solid wastes in China is large, the environmental impact is prominent, the utilization prospect is wide, and the method is a core field of comprehensive utilization of resources. The promotion of the comprehensive utilization of a large amount of solid wastes has important significance for improving the resource utilization efficiency, improving the environmental quality and promoting the comprehensive green transformation of the economic and social development. The raw soil building is long in time consumption due to the fact that the wall body is rammed and built, the integrity of the wall body is insufficient, the outer wall of the building is prone to cracking, and the building bearing capacity and the anti-seismic performance are not beneficial to being improved. The wholeness of the used clay of outside bearing member is relatively poor, and anti-seismic performance is not enough, and is influenced by weather erosion and great, and corrosion-resistant and durability are poor. The western Sichuan plateau belongs to the area with frequent earthquakes, and has active geological structure and cold climate. Therefore, the research on how to improve the performance of the green soil bearing structure and the outer protective structure of the building in the area and enhance the greenness and frost resistance of the green soil material under the requirements of low carbon and environmental protection becomes the problem which must be solved firstly by the research.
Therefore, while maintaining the high-speed development of economy, the method has great significance for researching the improvement of rural human settlements and the improvement of the performance of rural earth-building, improving the rural living safety of China and improving the resource utilization efficiency of solid wastes.
Disclosure of Invention
Aiming at the prior art, the invention provides environment-friendly economical ceramsite for plateau building concrete and a preparation method and application thereof, aiming at solving the problems of easy cracking, poor bearing capacity and seismic performance, poor freezing resistance and the like of the existing raw soil building outer wall.
In order to achieve the purpose, the invention adopts the technical scheme that: the environment-friendly economical ceramsite for plateau building concrete comprises the following raw materials in parts by weight: 50-70 parts of recycled concrete, 10-30 parts of loess, 5-15 parts of phosphogypsum, 5-10 parts of S105-grade granulated blast furnace slag, 5-10 parts of foaming agent and 10-15 parts of fluxing agent.
The loess is native loess material of plateau in western province, and the loess is widely distributed in the region and mainly comprises illite, kaolinite, and green
Mud stone
Under the action of alkali or acid excitant such as polysilicic aluminate, iron ion, aluminium ion, etc., it can be mixed with phosphorus stone
The paste and other gelled materials react to generate a new compound, and the new compound plays a supporting role in improving the strength of the ceramsite. Meanwhile, the use of the localization material can reduce the energy consumption of material transportation and save energy. Under the action of alkaline excitant granulated blast furnace slag, aluminum ions in clay minerals such as illite, kaolinite, chlorite and the like can generate ettringite (3 CaO. Al) through a gelling reaction with phosphogypsum 2 O 3 ·3CaSO 4 ·32H 2 O) (formula 1-1), the gypsum mineral in phosphogypsum provides SO for the generation of ettringite 4 2- . The new mineral generation makes the inside of the ceramsite form a compact network structure, has the effects of improving the strength and the overall performance of the ceramsite, increasing the strength of the ceramsite, reducing the water absorption rate, realizing the supporting and improving effects on the loess material and realizing the effectCa of existing phosphogypsum 2+ And SO 4 2- And (4) recycling.
Ca(OH) 2 =Ca 2+ +2OH - （1）
CaSO 4 =Ca 2+ +SO 4 2- （2）
Al 2 O 3 (active) +6Ca 2+ +6OH - +3SO 4 2- →
3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O(Aft) （3） （1-1）
The invention can realize the resource utilization of solid wastes such as phosphogypsum, construction waste (recycled concrete), granulated blast furnace slag and the like. In the ceramsite preparation process, the highest doping amount of the recycled concrete (solid waste) accounts for 70 percent of the total amount of the components, the highest phosphogypsum accounts for 15 percent, and the highest granulated blast furnace slag accounts for 10 percent, so that the solid waste can be effectively recycled, and the environmental pollution is reduced. At present, the phosphogypsum stockpiling quantity exceeds 5 multiplied by 10 in China 8 t, and utilization rate is less than 40%. The large amount of phosphogypsum is produced, which not only occupies a large amount of land, but also pollutes surrounding water, soil and atmosphere, destroys ecological environment and seriously hinders the sustainable development of phosphorus chemical industry. Along with the economic development of China, a large number of original buildings are dismantled and rebuilt, so that a large number of construction wastes are generated, the wastes not only influence urban life and cause environmental pollution, but also inactivate a large amount of soil by alkaline waste residues generated in the burying treatment process, and secondary pollution is caused to the environment while a large amount of transportation cost is spent. The recycled aggregate is prepared by crushing, screening, cleaning and the like on the waste concrete, so that the problem of dumping of the construction waste is reduced, and the exploitation of the natural aggregate is reduced; at present, the comprehensive utilization rate of blast furnace slag in China is still far lower than that of developed countries abroad, and the blast furnace slag is mainly used as a filler in industries such as buildings, roads and the like, and has lower added value. Aiming at the potential activity of the slag, the blast furnace slag micro powder is prepared in a grinding mode to improve the activity of the slag, so that the high added value utilization of the slag is realized, and a new utilization way is developed.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the foaming agent is at least one of coal, silicon carbide and calcium carbonate.
Further, the flux is at least one of sodium carbonate, barium carbonate, iron oxide and magnesium oxide.
Further, the recycled concrete is prepared by the following steps: removing impurities from the construction waste, crushing, grinding and sieving to obtain particles with the particle size not more than 2 mm.
Further, the loess with water content of 10 to 12% comprises the following clay mineral components: the water content of the loess is 10 to 12 percent, and the clay mineral components in the loess comprise 55 to 65wt percent of illite, 20 to 30wt percent of chlorite and 10 to 15wt percent of kaolinite.
Further, the phosphogypsum has a pH value of 5~6 and comprises the following main chemical components: SO (SO) 3 49.69%, caO 35.02%, siO 2 6.61%; the ignition vector was 6.13%.
The invention also provides a preparation method of the environment-friendly economical ceramsite for plateau building concrete, which comprises the following steps:
sl, uniformly mixing the raw materials, and granulating to obtain raw material balls;
and S2, drying the raw material ball, sieving, preheating the raw material ball with the particle size of 3-20 mm at 300-500 ℃ for 10-30min, continuously heating to 900-1200 ℃, roasting for 5-25min, and naturally cooling to obtain the finished product.
The invention also provides application of the environment-friendly economical ceramsite for plateau building concrete in preparing light concrete.
Further, the method comprises the following steps: the ceramsite material is piled up in advance, large grains with the grain size of 18-20mm, medium grains with the grain size of 5-6mm and small grains with the grain size of 3-3.5mm are mixed to form graded ceramsite, and then mortar grouting is adopted to form the lightweight anti-freeze concrete.
The invention has the beneficial effects that:
1. the invention utilizes the recycled concrete, the phosphogypsum and the granulated blast furnace slag to prepare the environment-friendly and economical ceramsite, can promote the comprehensive utilization of a large amount of solid waste, and has important significance for improving the resource utilization efficiency, improving the environmental quality and promoting the comprehensive green transformation of the economic and social development.
2. The phosphogypsum is not required to be pretreated, the consumption is high, the phosphogypsum is mixed and formed at normal temperature and normal pressure, the process is simple, and the method is beneficial to reducing energy consumption and protecting environment.
3. The invention utilizes the building waste concrete to replace natural stone, can realize the recycling of materials, and has positive effects on the national energy-saving and emission-reducing requirements and the realization of the targets of carbon neutralization and carbon peak-reaching.
4. The method uses the loess in the western China, so that local materials are convenient to obtain, the use of the sandstone materials is reduced, the comprehensive application of the indigenous materials is realized, and the method is favorable for realizing building material saving and low carbon environmental protection.
5. The prepared ceramsite can meet the strength requirement of building engineering through compression test and analysis, and the ceramsite has strong freeze-thaw resistance durability through a freeze-thaw cycle experiment and a water absorption test, and is suitable for being used in the traditional building improvement and reconstruction of plateaus.
6. The environment-friendly economical ceramsite disclosed by the invention is used as aggregate to prepare concrete, good gradation is formed, the compactness of the concrete is increased, the strength of the concrete is effectively increased, the water absorption and the influence of freeze-thaw cycle are reduced, and the durability of the concrete is improved.
Detailed Description
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1
The environment-friendly economical ceramsite for plateau building concrete comprises the following raw materials in parts by weight: 50 parts of recycled concrete, 25 parts of loess, 5 parts of phosphogypsum, 5 parts of S105-grade granulated blast furnace slag, 5 parts of calcium carbonate and 10 parts of sodium carbonate;
the recycled concrete is prepared by the following steps: removing impurities from the construction waste, crushing, grinding and sieving to obtain particles with the particle size not more than 2 mm;
wherein the loess has water content of 11%, and clay mineral components in the loess have the following ratio: 60wt% illite, 25wt% chlorite, 15wt% kaolinite;
wherein the pH value of the phosphogypsum is 5.6,the main chemical components are as follows: SO 3 49.69%, caO 35.02%, siO 2 6.61 percent; the ignition vector was 6.13%.
The preparation method of the environment-friendly economical ceramsite for plateau building concrete comprises the following steps:
sl, putting the raw materials into a ball mill, stirring until the raw materials are uniformly mixed, and putting the mixture into a disc granulator for granulation to obtain raw material balls;
and S2, drying the raw material balls in an oven at 110 ℃, screening, preheating the raw material balls with the particle sizes of 3-20mm at 300 ℃ for 30min, continuously heating to 900 ℃, roasting for 25min, and naturally cooling to obtain the finished product.
Example 2
The environment-friendly economical ceramsite for plateau building concrete comprises the following raw materials in parts by weight: 60 parts of recycled concrete, 30 parts of loess, 15 parts of phosphogypsum, 10 parts of S105-grade granulated blast furnace slag, 8 parts of silicon carbide and 15 parts of barium carbonate;
the recycled concrete is prepared by the following steps: removing impurities from the construction waste, crushing, grinding and sieving to obtain particles with the particle size not more than 2 mm;
wherein the loess has water content of 10%, and clay minerals in the loess have the following ratio: 55wt% illite, 30wt% chlorite, 10wt% kaolinite;
wherein, the phosphogypsum has a pH value of 5 and comprises the following main chemical components: SO (SO) 3 49.69%, caO 35.02%, siO 2 6.61%; the ignition vector was 6.13%.
The preparation method of the environment-friendly economical ceramsite for plateau building concrete comprises the following steps:
sl, putting the raw materials into a ball mill, stirring until the raw materials are uniformly mixed, and putting the mixture into a disc granulator for granulation to obtain raw material balls;
s2, drying the raw material balls in a 110 ℃ oven, screening, preheating the raw material balls with the particle sizes of 3-20mm at 500 ℃ for 10min, continuously heating to 1200 ℃, roasting for 5min, and naturally cooling to obtain the finished product.
Example 3
The environment-friendly economical ceramsite for plateau building concrete comprises the following raw materials in parts by weight: 70 parts of recycled concrete, 10 parts of loess, 10 parts of phosphogypsum, 8 parts of S105-grade granulated blast furnace slag, 10 parts of calcium carbonate and 10 parts of magnesium oxide;
the recycled concrete is prepared by the following steps: removing impurities from the construction waste, crushing, grinding and sieving to obtain particles with the particle size not more than 2 mm;
wherein the loess has a water content of 9%, and the clay minerals in the loess have the following proportions: 65wt% illite, 20wt% chlorite, 15wt% kaolinite;
wherein, the phosphogypsum has a pH value of 5 and comprises the following main chemical components: SO 3 49.69%, caO 35.02%, siO 2 6.61%; the ignition vector was 6.13%.
The preparation method of the environment-friendly economical ceramsite for plateau building concrete comprises the following steps:
sl, putting the raw materials into a ball mill, stirring until the raw materials are uniformly mixed, and then putting the mixture into a disc granulator for granulation to obtain raw material balls;
and S2, drying the raw material balls in an oven at 110 ℃, screening, preheating the raw material balls with the particle sizes of 3-20mm at 400 ℃ for 20min, continuously heating to 1100 ℃, roasting for 15min, and naturally cooling to obtain the finished product.
Comparative example 1
The granulated blast furnace slag of grade S105 in example 1 was removed, and the rest was the same as in example 1.
Comparative example 2
The loess in example 1 was removed, and the rest was the same as in example 1.
Comparative example 3
The phosphogypsum in example 1 was changed to fluorgypsum and the rest was the same as in example 1.
The environment-friendly and economical ceramsite obtained in example 1~3 was subjected to the performance test, and the test results are shown in table 1.
TABLE 1 Performance test of environmentally friendly and economical haydite
| Numbering | Bulk density | Barrel pressure strength | Water absorption rate |
| Example 1 | 925.1kg/m 3 | 4.7MPa | 2.4% |
| Example 2 | 902.8kg/m 3 | 4.5MPa | 2.1% |
| Example 3 | 910.6kg/m 3 | 4.5MPa | 2.2% |
| Comparative example 1 | 750.4kg/m 3 | 3.2MPa | 5.1% |
| Comparative example 2 | 782.1kg/m 3 | 3.5MPa | 4.8% |
| Comparative example 3 | 816.5kg/m 3 | 3.6MPa | 4.5% |
As can be seen from Table 1, the environment-friendly and energy-saving ceramsite disclosed by the invention has the advantages that the strength can meet the requirement of constructional engineering on strength, the water absorption rate is low, and the lightweight and heat insulation effects are achieved.
The environment-friendly economical ceramsite prepared in the embodiment 1~3 is used as lightweight concrete aggregate, three ceramsite materials are respectively stacked in advance, large grains (18-20 mm), medium grains (5-6 mm) and small grains (3-3.5 mm) are selected according to the grading requirement, and are mixed according to the proportion of 4. The concrete test block is tested according to the experimental requirements of a slow freezing method in the standard of test methods for long-term performance and durability of common concrete in GBT 50082-2009 on volume weight and compressive strength before and after a freezing-thawing cycle experiment, the compressive strength and the mass loss rate of the test block are within the standard limit (25 percent and 5 percent), and the plateau use requirements are met. The measurement results are shown in table 2:
table 2: compressive strength and freeze-thaw experimental result of lightweight concrete
As can be seen from the table 2, before and after the freeze-thaw cycle experiment, the frost-resistant concrete has low mass loss rate and low compressive strength loss rate, so that the environment-friendly economical ceramsite has strong frost resistance, and is suitable for being used in the conventional building improvement and reconstruction of the plateau.
While the present invention has been described in detail with reference to the embodiments, it should not be construed as limited to the scope of the patent. Various modifications and changes may be made by those skilled in the art without inventive work within the scope of the appended claims.
Claims (9)
1. The environment-friendly economical ceramsite for plateau building concrete is characterized by comprising the following raw materials in parts by weight: 50-70 parts of recycled concrete, 10-30 parts of loess, 5-15 parts of phosphogypsum, 5-10 parts of S105-grade granulated blast furnace slag, 5-10 parts of foaming agent and 10-15 parts of fluxing agent.
2. The environment-friendly economical ceramsite for plateau building concrete according to claim 1, wherein the ceramsite comprises: the foaming agent is at least one of coal, silicon carbide and calcium carbonate.
3. The environment-friendly economical ceramsite for plateau building concrete according to claim 1, wherein the ceramsite comprises: the fluxing agent is at least one of sodium carbonate, barium carbonate, iron oxide and magnesium oxide.
4. The environment-friendly energy-saving ceramsite for plateau building concrete according to claim 1, wherein the recycled concrete is prepared by the following steps: removing impurities from the construction waste, crushing, grinding and sieving to obtain particles with the particle size not more than 2 mm.
5. The environment-friendly economical ceramsite for plateau building concrete according to claim 1, wherein the ceramsite comprises: the loess has water content of 10-12 wt%, and contains clay mineral components including illite 55-65 wt%, chlorite 20-30 wt% and kaolinite 10-15 wt%.
6. The environment-friendly energy-saving ceramsite for plateau building concrete according to claim 1, wherein the ceramsite comprises: the phosphogypsum has a pH value of 5-6 and comprises the following main chemical components: SO (SO) 3 49.69%, caO 35.02%, siO 2 6.61%; the ignition vector was 6.13%.
7. The preparation method of environment-friendly economical ceramsite for plateau building concrete according to any one of claims 1 to 6, characterized by comprising the following steps:
sl, after the raw materials are evenly mixed, granulating to obtain raw material balls;
s2, drying the raw material balls, screening, preheating the raw material balls with the particle size of 3-20 mm at 300-500 ℃ for 10-30 min, continuously heating to 900-1200 ℃, roasting for 5-25 min, and naturally cooling to obtain the finished product.
8. The use of the environment-friendly economical ceramsite for plateau building concrete as defined in any one of claims 1 to 6 in the preparation of lightweight concrete.
9. Use according to claim 8, characterized in that it comprises the following steps: the ceramsite material is pre-accumulated, large grains with the size of 18-20mm, medium grains with the size of 5-6mm and small grains with the size of 3-3.5mm are mixed to form graded ceramsite, and then mortar grouting is adopted to form the lightweight antifreezing concrete.
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| CN101913846B (en) * | 2010-08-11 | 2012-05-23 | 昆明理工大学 | Method for synthesizing ceramsite by coal slurry, ardealite and metallurgical slag |
| CN105016767B (en) * | 2015-08-18 | 2018-01-09 | 长沙鼎成新材料科技有限公司 | A kind of light non-fired haydite for road capital construction and preparation method thereof |
| CN105198383A (en) * | 2015-09-02 | 2015-12-30 | 越艳 | Method for manufacturing garbage soil ceramsite and product of garbage soil ceramsite |
| CN106277878A (en) * | 2016-08-10 | 2017-01-04 | 卓达新材料科技集团威海股份有限公司 | A kind of gangue building waste haydite and preparation method thereof |
| CN106673690A (en) * | 2017-01-20 | 2017-05-17 | 李春刚 | Magnetite or vanadium titano-magnetite tailing sand expanded ceramsite and preparation method thereof |
| CN107686334B (en) * | 2017-09-25 | 2020-06-26 | 贵州开磷磷石膏综合利用有限公司 | Phosphogypsum fly ash ceramsite and preparation method thereof |
| CN108503386B (en) * | 2018-04-20 | 2020-07-28 | 北京建筑材料科学研究总院有限公司 | Process for preparing non-sintered ceramsite by utilizing metallurgical contaminated soil |
| CN111116210B (en) * | 2019-12-30 | 2021-05-11 | 同济大学 | Method for preparing light ceramsite by utilizing biological coal ecological sintering waste soil |
| CN113880477A (en) * | 2021-08-31 | 2022-01-04 | 江西盖亚环保科技有限公司 | Building ceramsite prepared from fly ash, sludge and slag and preparation process thereof |
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