CN111892345A - Fluidized solidified soil based on granite muck and preparation method thereof - Google Patents
Fluidized solidified soil based on granite muck and preparation method thereof Download PDFInfo
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- CN111892345A CN111892345A CN201910371791.1A CN201910371791A CN111892345A CN 111892345 A CN111892345 A CN 111892345A CN 201910371791 A CN201910371791 A CN 201910371791A CN 111892345 A CN111892345 A CN 111892345A
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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
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Abstract
The invention belongs to the technical field of civil engineering, and particularly relates to fluidized solidified soil based on granite muck and a preparation method thereof. The fluidized solidified soil based on granite muck provided by the invention comprises cement, fly ash, water and granite muck; by taking cement as 130-160 parts by weight, 20-60 parts by weight of fly ash, 650 parts by weight of water 550-500 parts by weight of granite slag soil 420-160 parts by weight; wherein the particle size of the granite slag soil is below 30 mm. Under the synergistic effect of cement, fly ash, water and granite muck with specific weight proportion, the fluidized solidified soil has good fluidity, can fill narrow spaces such as crack, pointing and the like by self-flowing, can meet the strength required by backfilling without manual compaction after backfilling construction, has high filling efficiency, can simplify the backfilling construction process, improves the construction efficiency and has high engineering applicability.
Description
Technical Field
The invention belongs to the technical field of civil engineering, and particularly relates to fluidized solidified soil based on granite muck and a preparation method thereof.
Background
With the continuous development of urban construction in China, overground spaces are gradually saturated, and underground spaces are developed more and more, for example: foundation, underground traffic pipeline, underground shopping mall, underground pipeline construction, etc. The construction of underground structures usually adopts the mode of open cut to go on, after the construction is accomplished, need backfill the foundation ditch to, after backfilling, in order to reach certain soil mechanics characteristic and compactness, prevent that the foundation ditch from sinking, need roll the backfill region many times, the engineering volume is huge. However, even if rolling is performed for multiple times, construction areas in which backfill areas are not easily compacted still exist, such as water storage pipes, gas transmission pipes, electric wires and cables buried under urban roads, and due to the narrow building boundary, the filling effect of the conventional backfill process to narrow spaces such as cracks and pointing seams is poor, the engineering quality cannot be guaranteed, and even accidents such as pavement settlement and collapse can be caused.
At present, in order to meet the requirements of mechanical properties and compactness of backfill soil, the backfill soil used in the urban pipe network construction process needs to be specially purchased, the cost is huge, moreover, the backfill soil is generally obtained by excavation from a place with better soil quality, the excavation process can cause certain damage to the original natural environment, and the backfill soil is not environment-friendly and is not beneficial to the sustainable development of the natural ecological environment.
Disclosure of Invention
The invention mainly aims to provide fluidized solidified soil based on granite muck, and aims to solve the technical problem that the existing backfill soil is poor in filling effect on a narrow space.
In order to achieve the aim, the invention provides fluidized solidified soil based on granite muck, which comprises cement, fly ash, water and granite muck; based on the cement of 130-160 parts by weight, the fly ash is 20-60 parts by weight, the water is 550-650 parts by weight, and the granite slag is 420-500 parts by weight;
wherein the particle size of the granite slag soil is below 30 mm.
The fluidized solidified soil based on the granite muck comprises cement, fly ash and water in a specific weight part ratio, and the granite muck in a specific weight part ratio and particle size range, wherein the cement, the fly ash, the water and the granite muck have synergistic effects, so that the fluidized solidified soil disclosed by the invention has good fluidity, can automatically flow to fill narrow spaces such as cracks and pointing seams, meets the requirements in strength after backfilling construction, does not need additional manual compaction, is high in filling efficiency, can simplify backfilling construction process, improves construction efficiency, and is high in engineering applicability; moreover, the components of the fluidized solidified soil are uniformly dispersed, the properties are stable, the strength discreteness of the filled and solidified residue soil is small, and the engineering quality is ensured; meanwhile, the granite slag soil is common waste slag soil in the urban construction process, and the invention adopts the granite slag soil as a main component, thereby changing waste into valuable, saving the stacking space of the granite slag soil and effectively reducing the backfilling construction cost.
Correspondingly, the invention also provides a preparation method of the fluidized solidified soil based on the granite muck, which comprises the following steps:
weighing the following raw materials according to a formula: 500 parts of granite slag soil 420-160 parts of cement 130-650 parts of fly ash and 650 parts of water 550-650 parts of fly ash;
mixing and stirring the cement, the fly ash and the water to obtain solidified slurry;
mixing and stirring the granite slag soil and the solidified slurry to obtain the fluidized solidified soil;
wherein the maximum particle size of the granite slag soil is below 30 mm.
The preparation method of the fluidized solidified soil provided by the invention mixes the cement, the fly ash, the water and the granite muck according to the specific weight part ratio, and has the advantages of simple and convenient operation and high engineering applicability.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The parts by weight of the components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of the components, but also represent the proportional relationship of the weight of the components, and therefore, the content of the components of the composition according to the description of the embodiments of the present invention is scaled up or down within the scope disclosed in the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiments of the present invention may be a unit of weight known in the medical field, such as μ g, mg, g, kg.
In order to solve the technical problem that the existing backfill soil is poor in filling effect on a narrow space, the embodiment of the invention provides fluidized solidified soil based on granite muck, which comprises cement, fly ash, water and granite muck; based on the cement of 130-160 parts by weight, the fly ash is 20-60 parts by weight, the water is 550-650 parts by weight, and the granite slag is 420-500 parts by weight;
wherein the particle size of the granite slag soil is below 30 mm.
Specifically, the granite slag soil is a slag soil mixture formed by mixing gravels, powder particles and sticky particles with different particle sizes, and granite is a base material for forming the crust on the continental land, so that the granite slag soil is commonly used in the construction process of urban pipelines and subways. Conventionally, granite dregs are a kind of inhomogeneous mixed material with poor mechanical properties, and particularly after contacting with water, the mechanical properties of the granite dregs are reduced well, and the granite dregs are difficult to be directly used in building engineering, so that the granite dregs are often stacked on a building open space as waste dregs, and occupy a large stacking space.
In the embodiment of the invention, the granite slag soil is used as one of the main components of the fluidized solidified soil of the embodiment of the invention, the particle size of the granite slag soil is less than 30mm, and the granite slag soil is mixed and stirred with the solidified slurry formed by cement, fly ash and water in a specific weight ratio, so that the fluidized solidified soil with excellent flowing performance is formed, narrow spaces such as cracks and pointing seams can be filled by flowing automatically, the filling efficiency is high, the mechanical property of the granite slag soil is improved, the fluidized solidified soil has certain strength after filling, curing and maintenance, and the requirements of urban pipe network backfill construction are met. Experiments prove that the fluidity of the fluidized solidified soil with the formula is up to 220mm, the filling efficiency is high, and the fluidized solidified soil can be filled in narrow spaces, such as caves caused by rainwater erosion.
As a preferred embodiment, the granite slag soil is selected from weathered granite slag soil which is a weathered granite material, and the weathered granite slag soil is easy to polish and crush to a proper particle size distribution, is convenient to construct, saves energy and saves consumption.
As another preferred embodiment, the particle size of the granite slag is 10-20mm, specifically 10, 12, 15, 18, 20 mm. The selection of the granite slag soil with the particle size of 10-20mm can promote the mixing of the granite slag soil and the curing slurry formed by cement, water and fly ash, increase the fluidity of fluidized curing soil and avoid material segregation.
Specifically, in the embodiment of the invention, the cement, the fly ash and the water are used as the curing slurry of the fluidized curing soil, the components are simple, the property is stable, the strength discreteness of the filled, cured and maintained muck is small, and the engineering quality is ensured.
Preferably, the cement is selected from one of portland cement and sulphoaluminate cement. In one embodiment, the cement is selected from portland cement, preferably composite portland cement designated 32.5 or ordinary portland cement designated 42.5, which is the most common cement in construction, low cost and easy to purchase. In another embodiment, the cement is selected from sulphoaluminate cement, preferably sulphoaluminate cement with the label of 42.5, the sulphoaluminate cement has quick hydration reaction, the maintenance time can be obviously shortened, and the construction period can be shortened.
Preferably, the fly ash is class II or above fly ash. The fly ash is a pozzolanic material, can promote the pozzolanic reaction in the hydration of fluidized soil, and can improve the pumpability of the fluidized soil. Furthermore, the fineness of the fly ash (the screen residue of a square-hole screen with the size of 45 mu m) is less than or equal to 15.
In a preferred embodiment, the fluidized and solidified soil further comprises one or more of an air entraining agent, a water reducing agent, an early strength agent and a retarder. The air entraining agent is an additive which introduces a large amount of closed and stable micro-bubbles which are uniformly distributed in the mixing process of the concrete mixture, and is used for improving the workability, the water retention property and the cohesiveness of the concrete mixture and improving the fluidity of the concrete; the water reducing agent can ensure the solid content of concrete, reduce the water consumption and properly improve the fluidity; the early strength agent is used for improving the early strength of concrete and shortening the curing time; the retarder can reduce the hydration reaction speed and prolong the curing time.
Further, based on the weight of 130-160 parts of cement, 0-40 parts of air entraining agent, 0-40 parts of water reducing agent, 0-30 parts of early strength admixture and 0-30 parts of retarder.
In conclusion, the fluidized solidified soil based on granite muck provided by the invention comprises cement, fly ash and water in a specific weight part ratio and granite muck with a specific weight part ratio and a specific particle size range, and under the synergistic effect of the cement, the fly ash, the water and the granite muck, the fluidized solidified soil provided by the invention has good fluidity, so that the fluidized solidified soil can automatically flow to fill narrow spaces such as crack and pointing, and does not need manual compaction after backfilling construction, the filling efficiency is high, the backfilling construction process can be simplified, the construction efficiency is improved, and the engineering applicability is high; moreover, the components of the fluidized solidified soil are uniformly dispersed, the properties are stable, the strength discreteness of the filled and solidified residue soil is small, and the engineering quality is ensured; meanwhile, the granite slag soil is common waste slag soil in the process of foundation pit excavation, and the granite slag soil is used as a main component, so that waste materials are changed into valuable materials, the stacking space of the granite slag soil is saved, and the backfilling construction cost is effectively reduced.
Correspondingly, the embodiment of the invention provides a preparation method of fluidized solidified soil based on granite muck, which comprises the following steps:
s01, weighing the following raw materials according to the formula: 500 parts of granite slag soil 420-160 parts of cement 130-650 parts of fly ash and 650 parts of water 550-650 parts of fly ash;
s02, mixing and stirring the cement, the fly ash and the water to obtain solidified slurry;
s03, mixing and stirring the granite slag soil and the solidified slurry to obtain the fluidized solidified soil;
wherein the particle size of the granite slag soil is below 30 mm.
The preparation method of the fluidized solidified soil provided by the invention mixes the cement, the fly ash, the water and the granite muck according to the specific weight part ratio, and has the advantages of simple and convenient operation and high engineering applicability.
Specifically, in step S01, the particle size of the granite slag is 30mm or less, preferably 10 to 20 mm.
Preferably, the preparation of the granite slag soil sequentially comprises the following steps: soil degradation, screening and crushing. The soil is decomposed for carrying out mud-residue separation on granite dregs, the screening is used for controlling the particle size of the granite dregs, and the crushing is used for further crushing larger blocks of dregs to proper particle size.
Further, the preparation of the granite muck specifically comprises the following steps:
s011, soil decomposing: placing the granite muck into a forced mixer for high-speed mixing, wherein the rotating speed is controlled to be more than 200rpm, so that the blocky soil body in the granite muck is dispersed;
s012 and screening: filtering out larger stones in the granite slag soil after soil decomposition through a screening test, and collecting crushed materials, wherein the maximum aperture of screening is controlled to be 10-20 mm;
s013 and crushing: crushing the filtered larger stones by using an impact crusher and a counter-impact crusher, wherein the size of the crushed stones is controlled to be below 10-20 mm;
s014, combining the crushed pieces collected in the step S012 and the crushed pieces of the step S014.
Specifically, in step S02 and/or step S03, the mixing and stirring are understood to be fully and uniformly mixed, preferably, the stirring speed is not lower than 200rpm, and the stirring time is not lower than 1 minute; more preferably, the stirring speed is not lower than 300rpm, and the stirring time is not lower than 2 minutes.
In one embodiment, the mixing and stirring is performed by a forced mixer.
Preferably, after step S03, fluidity control is performed on the fluidized solidified soil. More specifically, the fluidity control specifically includes:
s031, providing a measurement device: a cylinder with an inner diameter of 80 mm and a height of 80 mm, and the inner wall of the cylinder is smooth; the transparent organic glass flat plate is smooth in the upper surface, scales are marked on the bottom surface, and direct reading is carried out;
s032, coating lubricating oil on the inner wall of the cylinder, and then placing the cylinder in the middle of an organic glass plate; then, pouring the fluidized solidified soil into a cylinder, wherein the filling amount of the fluidized solidified soil is equal to the top surface of the cylinder; and then, quickly lifting the cylinder to enable the fluidized solidified soil to freely expand, reading the diameter of the mud cake on the organic glass plate when the fluidized solidified soil is not expanded any more, and averaging the multi-dimensional readings to obtain a fluidity test result.
Further, at least one of the solidified slurry, the air-entraining agent, and the water reducing agent of step S02 is added to the fluidized solidified soil of step S03 to adjust the fluidity of the fluidized solidified soil. In one embodiment, at least one of an air-entraining agent and a water-reducing agent is added, wherein the addition amount of the air-entraining agent is 0-40 parts, the addition amount of the water-reducing agent is 0-40 parts, and the air-entraining agent and the water-reducing agent are not 0 at the same time.
Furthermore, an early strength agent and a retarder are added into the fluidized solidified soil in the step S03, so that the strength forming time of the fluidized solidified soil is adjusted and controlled, the requirements of different application scenes are met, and the engineering applicability is improved. In one embodiment, at least one of the early strength agent and the retarder is added, the addition amount of the early strength agent is controlled to be 0-30 parts, the addition amount of the coagulant is 0-30 parts, and the early strength agent and the retarder are not 0 at the same time.
Correspondingly, the embodiment of the invention also provides a construction method of the fluidized solidified soil, which comprises the following steps: and providing the fluidized solidified soil, filling and pouring the fluidized solidified soil, and watering and maintaining after solidification and molding.
Preferably, the casting comprises: and (3) conveying the fluidized solidified soil to a site, pouring, and paying attention to segmentation (the longest length is not more than 15 meters), layering (the highest filling height is not more than 1 meter at one time), and seam treatment (the sections are preferably made into a step type, and the layers are preferably roughened).
Preferably, the curing is mainly moisturizing curing, and moisturizing curing is performed by using a material capable of moisturizing such as a film or a mat, and exposure of the fluidized soil just poured to sunlight is prohibited.
In order that the above-described details and operation of the present invention may be clearly understood by those skilled in the art, and the improved performance of the fluidized and solidified soil and the method for preparing the same according to the embodiments of the present invention will be apparent, the practice of the present invention will be illustrated by the following examples.
Example 1
This example produces a fluidized solidified soil comprising: 140 parts of cement, 20 parts of fly ash, 600 parts of water, 450 parts of weathered granite slag soil, 5 parts of a water reducing agent and 15 parts of an early strength agent; wherein the particle size of the granite slag soil is below 30 mm.
The preparation method comprises the following steps:
s11, weighing the raw materials according to the formula;
s12, placing the cement, the fly ash and the water in a forced mixer, and mixing and stirring at a rotating speed of 200rpm for 1min to fully and uniformly mix the components to obtain solidified slurry;
s13, placing the granite muck and the solidified slurry into a forced mixer, and mixing and stirring at the rotating speed of 350rpm for 2min to fully and uniformly mix the components to obtain the fluidized solidified soil;
s14, adding 5 parts by weight of water reducing agent into the fluidized solidified soil, and adjusting the fluidity of the fluidized solidified soil; then, 15 parts by weight of early strength agent is added to adjust the strength forming time of the fluidized solidified soil so as to meet the engineering requirements;
s15, conveying the product obtained in the step S14 to the site, and pouring; then, the straw mat was sprayed with water and cured for 7 days.
Test example
A part of the fluidized solidified soil of the step S13 in the embodiment 1 is taken for fluidity test, and the specific detection process is as follows:
s131, providing a measuring device: a cylinder with an inner diameter of 80 mm and a height of 80 mm, and the inner wall of the cylinder is smooth; the transparent organic glass flat plate is smooth in the upper surface, scales are marked on the bottom surface, and direct reading is carried out;
s132, smearing lubricating oil on the inner wall of the cylinder, and then placing the cylinder in the middle of an organic glass plate; then, pouring the fluidized solidified soil into a cylinder, wherein the filling amount of the fluidized solidified soil is equal to the top surface of the cylinder; and then, quickly lifting the cylinder to enable the fluidized solidified soil to freely expand, reading the diameter of the mud cake on the organic glass plate when the fluidized solidified soil is not expanded any more, and averaging the multi-dimensional readings to obtain a fluidity test result.
The test shows that the fluidity of the fluidized solidified soil is 220mm, the grade is S3, the fluidity grade is high, and the filling rate of the fluidized solidified soil is high. Table 1 is a correspondence table between fluidity levels and fluidity.
TABLE 1
| Grade | Fluidity (mm) |
| S1 | 160-180 |
| S2 | 180-200 |
| S3 | 200-300 |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The fluidized solidified soil based on granite muck is characterized by comprising cement, fly ash, water and granite muck; based on the cement of 130-160 parts by weight, the fly ash is 20-60 parts by weight, the water is 550-650 parts by weight, and the granite slag is 420-500 parts by weight;
wherein the particle size of the granite slag soil is below 30 mm.
2. The fluidized solidified soil of claim 1, wherein the granite slag is selected from weathered granite.
3. The fluidized solidified soil of claim 1 or 2, wherein the cement is selected from one of portland cement and sulphoaluminate cement.
4. The fluidized solidified soil according to claim 1 or 2, wherein the fly ash is class ii fly ash.
5. The fluidized solidified soil of claim 1 or 2, further comprising one or more of an air entraining agent, a water reducing agent, an early strength agent, and a retarder.
6. The fluidized solidified soil as claimed in claim 5, wherein the amount of the air-entraining agent is 0-40 parts by weight, the amount of the water reducing agent is 0-40 parts by weight, the amount of the early strength admixture is 0-30 parts by weight, and the amount of the retarder is 0-30 parts by weight, based on the cement is 130-160 parts by weight.
7. A preparation method of fluidized solidified soil based on granite muck is characterized by comprising the following steps:
weighing the following raw materials according to a formula: 500 parts of granite slag soil 420-160 parts of cement 130-650 parts of fly ash and 650 parts of water 550-650 parts of fly ash;
mixing and stirring the cement, the fly ash and the water to obtain solidified slurry;
mixing and stirring the granite slag soil and the solidified slurry to obtain the fluidized solidified soil;
wherein the particle size of the granite slag soil is below 30 mm.
8. The preparation method according to claim 7, wherein in the step of mixing and stirring the cement, the fly ash and the water and/or the step of mixing and stirring the granite slag and the solidified slurry, the stirring speed is not lower than 200rpm, and the stirring time is not lower than 1 minute.
9. The method of claim 7, wherein the granite slag is selected from weathered granite.
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| CN110734266A (en) * | 2019-09-24 | 2020-01-31 | 中电建生态环境集团有限公司 | soda residue soil regeneration backfill material and preparation method thereof |
| CN114477902A (en) * | 2022-02-08 | 2022-05-13 | 北京中润宝成工程技术有限公司 | Soil curing agent, self-compacting high-flow-state backfill material and construction method thereof |
| CN114956769A (en) * | 2022-06-14 | 2022-08-30 | 中建三局第二建设工程有限责任公司 | Self-compacting backfill waterproof integrated material and preparation method thereof |
| CN116283093A (en) * | 2023-03-10 | 2023-06-23 | 华侨大学 | Manufacturing method of carbonization improved flow solidified soil |
| CN116332611A (en) * | 2023-05-29 | 2023-06-27 | 江苏绿和环境科技有限公司 | Premixed fluidized solidified soil and preparation method thereof |
| CN116332607A (en) * | 2023-04-14 | 2023-06-27 | 北京中德建基路桥工程技术有限公司 | Pile foundation cavity recharging flow state solidified drilling slag mixture and preparation method thereof |
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| CN110734266A (en) * | 2019-09-24 | 2020-01-31 | 中电建生态环境集团有限公司 | soda residue soil regeneration backfill material and preparation method thereof |
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| CN116283093A (en) * | 2023-03-10 | 2023-06-23 | 华侨大学 | Manufacturing method of carbonization improved flow solidified soil |
| CN116332607A (en) * | 2023-04-14 | 2023-06-27 | 北京中德建基路桥工程技术有限公司 | Pile foundation cavity recharging flow state solidified drilling slag mixture and preparation method thereof |
| CN116332611A (en) * | 2023-05-29 | 2023-06-27 | 江苏绿和环境科技有限公司 | Premixed fluidized solidified soil and preparation method thereof |
| CN116332611B (en) * | 2023-05-29 | 2023-08-11 | 江苏绿和环境科技有限公司 | Premixed fluidized solidified soil and preparation method thereof |
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Application publication date: 20201106 |