CN108658502B - Anti-mud agent for stabilizing reclaimed water and application method thereof - Google Patents
Anti-mud agent for stabilizing reclaimed water and application method thereof Download PDFInfo
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- CN108658502B CN108658502B CN201810557711.7A CN201810557711A CN108658502B CN 108658502 B CN108658502 B CN 108658502B CN 201810557711 A CN201810557711 A CN 201810557711A CN 108658502 B CN108658502 B CN 108658502B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a reclaimed water stabilizing anti-mud agent, which comprises a mud dispersing component, a mud adsorbing component, an ion complex component and a retarding component, wherein the components in parts by mass are as follows: 30-45 parts of a clay dispersing component, 4-7 parts of a clay adsorbing component, 30-40 parts of an ion complex component and 70-90 parts of a retarding component. The anti-mud agent can be compounded with other polycarboxylic acid water reducing agents for use, solves the technical bottleneck of applying the polycarboxylic acid water reducing agent to the stability of the reclaimed water, can improve the dispersibility of cement in the stability of the reclaimed water and enhance the stability strength of the reclaimed water, has the characteristics of low mixing amount, low cost and the like, cannot cause adverse effect on a stable base layer of the reclaimed water, and meanwhile, cannot pollute the environment in the production and use processes, thereby being a green and environment-friendly product.
Description
Technical Field
The invention belongs to the technical field of resource recycling, and particularly relates to a stable anti-mud agent for reclaimed water and an application method thereof.
Background
With the continuous acceleration of the urbanization process in China, the reconstruction strength of old pavements and houses is continuously enhanced, and a large amount of construction waste is generated. Unreasonable disposals such as landfill and stack of building rubbish not only can occupy the land resource, also can cause the serious pollution to soil, water source and air simultaneously. The construction solid waste is not useless in nature, is a resource placed at a wrong place at a wrong time, and is mismatching treasures and 'urban mines'. Through recycling processing, recycling or other measures, the waste water can be directly changed into products or converted into recycled secondary raw materials, the harm of the waste water is reduced or even avoided, and good economic, social and environmental benefits can be obtained. The construction waste recycled aggregate is applied to the cement stabilized recycled aggregate base layer (recycled water stabilization), and green utilization of the construction waste can be realized to the maximum extent.
The cement dosage in the reclaimed water stabilizer is about 5 percent (generally not less than 3 percent and not more than 7 percent), the unconfined compressive strength of the reclaimed water stabilizer in 7 days is about 3.6MPa, the unconfined compressive strength of the reclaimed water stabilizer in 7 days is also improved to a certain extent along with the improvement of the cement dosage, but generally not more than 4.4MPa, and the low compressive strength can limit the application range and the service life of the reclaimed water stabilizer.
The above-mentioned situation occurs because, in addition to the defects of the recycled aggregate itself, a small amount of cement cannot be uniformly dispersed during the mixing process, so that the overall strength of the recycled water stability is not high. In view of the above situation, water reducing agents are mostly used in engineering applications to increase cement dispersibility, and polycarboxylic acid water reducing agents are also the most widely used water reducing agents in the present day. However, the polycarboxylate water reducer is sensitive to the content of soil in the aggregate in the use process, and the content of fine aggregate (with the particle size of less than 0.075mm, which is subsequently called as 'regenerated soil') in the regenerated aggregate is about 4%, which is equivalent to the cement usage amount in the regenerated aggregate, so that the regenerated soil can inhibit the dispersion and even failure of the polycarboxylate water reducer on the cement, and finally the cement can still not be uniformly dispersed in the stability of the regenerated water, and a complete three-dimensional structure can not be formed during solidification, so that the effect of enhancing the stability and strength of the regenerated water can not be achieved.
In order to solve the influence of the recycled soil on the polycarboxylate superplasticizer, the common method is to directly increase the dosage of the polycarboxylate superplasticizer, but the increase of the dosage of the polycarboxylate superplasticizer not only leads to the increase of the production cost, but also adversely influences the stable strength of the recycled water due to excessive dosage.
In addition, the anti-mud agent can meet the use requirement by compounding with other anti-mud agents, but most of the anti-mud agents are applied to concrete, mainly aiming at the soil doped in new aggregates, such as montmorillonite, kaolin and the like, and no related research is carried out on the anti-mud agent for the regenerated water stabilization of the polycarboxylic acid water reducing agent, and no application example exists.
Therefore, the development of an anti-mud agent which can effectively inhibit the influence of the regenerated mud on the polycarboxylic acid water reducing agent is very important.
Disclosure of Invention
The invention aims to provide a mud-resistant agent for stabilizing reclaimed water, which can be compounded with other polycarboxylic acid water reducing agents for use, solves the technical bottleneck of applying the polycarboxylic acid water reducing agents to the reclaimed water stabilization, can improve the dispersibility of cement in the reclaimed water stabilization and enhance the strength of the reclaimed water stabilization, has the characteristics of low mixing amount, low cost and the like, cannot cause adverse effects on a reclaimed water stabilization base layer, cannot pollute the environment in the production and use processes, and is a green and environment-friendly product.
The invention also aims to provide an application method of the anti-mud agent for the reclaimed water stabilization, which solves the technical bottleneck of applying the polycarboxylate superplasticizer to the reclaimed water stabilization, improves the dispersibility of cement in the reclaimed water stabilization and enhances the strength of the reclaimed water stabilization by applying the anti-mud agent to the reclaimed water stabilization.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the anti-mud agent for stabilizing the reclaimed water comprises a mud dispersing component, a mud adsorbing component, an ion complex component and a retarding component, wherein the components in parts by mass are as follows: 30-45 parts of a clay dispersing component, 4-7 parts of a clay adsorbing component, 30-40 parts of an ion complex component and 70-90 parts of a retarding component;
wherein the soil dispersing component is sodium polyphosphate and/or sodium hexametaphosphate;
the soil adsorption component is polyethylene glycol and trimethyl hexadecyl ammonium bromide;
the ionic complex component is a mixture of citric acid and β -cyclodextrin;
the retarding component is one of disodium ethylene diamine tetraacetate or sodium gluconate.
In a preferred scheme, when the soil dispersing components are sodium polyphosphate and sodium hexametaphosphate, the mass ratio of the sodium polyphosphate to the sodium hexametaphosphate is 5:25-15: 35.
In a preferable scheme, the molecular weight of the polyethylene glycol is 1000-3000.
When the molecular weight of the polyethylene glycol is more than 4000, the adsorption of the regenerated soil to the polyethylene glycol is not facilitated; when the component is less than 600, the polyethylene glycol molecules can enter the soil molecular layers, and a protective layer is difficult to form on the surface of the regenerated soil.
In a preferred scheme, the mass ratio of the polyethylene glycol to the trimethylhexadecylammonium bromide is 25:10-30: 15.
In a preferred scheme, the mass ratio of the citric acid to the β -cyclodextrin is 20:10-30: 25.
The invention also provides an application of the anti-mud agent for stabilizing the reclaimed water, wherein the anti-mud agent aqueous solution and the carboxylic acid water reducing agent are mixed according to the mass ratio of 10:10-10:13 and added into the reclaimed water for stabilizing.
The anti-mud agent can be independently applied to reclaimed water stabilization, and the prepared anti-mud agent is dissolved in water to obtain an anti-mud agent solution.
The invention has the beneficial effects that:
1) the raw materials used in the invention are cheap, the application cost of the recycled water stabilizing additive is reduced to a certain extent, and the invention has good economic benefit. Meanwhile, the method is beneficial to the application of construction waste, the technical development of roads and the greening application of the construction waste.
2) When the anti-mud agent used in the invention is matched with the polycarboxylate water reducer for application, the anti-mud agent can be preferentially absorbed by the regenerated soil, so that the absorption of the regenerated soil on the polycarboxylate water reducer is reduced, the polycarboxylate water reducer has more effects on cement, the adsorption of the cement on the polycarboxylate water reducer can better disperse the cement, and cement particles are uniformly distributed, so that the cement can be uniformly distributed and stabilized with regenerated water, a uniform three-dimensional structure can be formed when the cement is solidified, and the 7-day strength of the stabilized regenerated water is increased.
3) The method for increasing the strength of the reclaimed cement stabilized base layer is generally to increase the dosage of cement, and the increase of the dosage of the cement not only increases the cost of the reclaimed cement, but also does not change the influence of reclaimed soil on the cement and does not change the dispersion effect of the cement. According to the technical scheme, under the condition that the using amount of cement in the reclaimed water is not changed, the dispersibility of the cement is improved, and the strength of the reclaimed water for 7 days is improved.
The invention can effectively prevent the influence of regenerated soil on the polycarboxylate superplasticizer, improve the dispersibility of cement and increase the stability strength of regenerated water, and has important significance for expanding the application range of the stability of the regenerated water and developing reasonable utilization of the external stability additive of the regenerated water and construction waste.
Detailed Description
The invention is explained in detail below by way of examples:
TABLE 1 weight ratio of the components of the anti-mud agent
The invention can improve the dispersibility of cement and increase the strength of the reclaimed water stabilization base course for reclaimed water stabilization with less cement consumption and higher reclaimed soil content, has low cost and environmental protection, and can not cause other negative effects on the reclaimed water stabilization base course.
In order to further illustrate the performance of the anti-mud agent, the anti-mud agent developed by the invention is mixed with a polycarboxylic acid water reducing agent, and is applied to cement mixed with regenerated soil for testing, and the specific test and result are as follows:
the mixing ratio of the anti-mud agent to the polycarboxylic acid water reducing agent is 14:15, the mixing amount is 0.25 percent of the gel material, and the mixing amount of the regenerated mud is 18 percent. The fixed water-cement ratio w/c is 0.35, and the test method refers to 'concrete admixture homogeneous test method' GB/T8077-2012.
TABLE 2 Cement Net paste fluidity and loss over time
Injecting: comparative example 1 is the use of only polycarboxylic acid water reducing agent without the addition of the anti-mud agent developed according to the present invention.
As can be seen from Table 2, examples 1, 2, 3 and 4 all improve the initial fluidity of cement as compared with comparative example 1, while the developed anti-mud agent greatly improves the loss of fluidity of cement paste over time.
The anti-mud agent and the polycarboxylate superplasticizer which are researched and developed by the invention are used together as an external additive to be applied to reclaimed water stabilization, the used cement is southern cement P.C 32.5.5, the reclaimed aggregate is divided into four grades, and the specific material proportion is shown in Table 3:
TABLE 3 design of reclaimed water stable materials
The dosage of the additive is 0.20 percent of the mass of the gel material, and the types of the additive are respectively a polycarboxylic acid water reducing agent, a polycarboxylic acid water reducing agent + an anti-mud agent, an anti-mud agent and a blank group without any additive. The specific formulation is shown in table 4:
TABLE 4 Stable additives for reclaimed water
| Serial number | Polycarboxylic acid water reducing agent/%) | Anti-mud agent/%) | Total mixing amount/% |
| Example 5 | 0.11 | 0.09 | 0.20 |
| Example 6 | 0 | 0.20 | 0.20 |
| Comparative example 2 | 0.20 | 0 | 0.20 |
| Comparative example 3 | 0 | 0 | 0 |
For the comparative example 3, the comparability of the test is ensured by adding 0.20 percent of the cement dosage, and the test result of the 7d unconfined compressive strength test method is as shown in the following table 5 according to JC/T2281-containing 2014 in inorganic mixture of recycled aggregate of construction waste for roads:
TABLE 5 unconfined compressive strength of 7d test piece for reclaimed water stability
Claims (3)
1. The mud-resisting agent for stabilizing reclaimed water is characterized by comprising 30-45 parts of a clay dispersing component, 4-7 parts of a clay adsorbing component, 30-40 parts of an ion complex component and 70-90 parts of a retarding component by mass, wherein the clay dispersing component is sodium polyphosphate and/or sodium hexametaphosphate, the clay adsorbing component is polyethylene glycol and trimethylhexadecyl ammonium bromide, the ion complex component is a mixture of citric acid and β -cyclodextrin, and the retarding component is one of disodium ethylenediaminetetraacetate or sodium gluconate;
the mass ratio of the polyethylene glycol to the trimethyl hexadecyl ammonium bromide is 25:10-30: 15;
the mass ratio of the citric acid to the β -cyclodextrin is 20:10-30: 25;
the molecular weight of the polyethylene glycol is 1000-3000.
2. The reclaimed water stabilizing anti-mud agent according to claim 1, wherein when the mud dispersing component is sodium polyphosphate and sodium hexametaphosphate, the mass ratio of the sodium polyphosphate to the sodium hexametaphosphate is 5:25 to 15: 35.
3. The application method of the anti-mud agent for stabilizing the reclaimed water as claimed in claim 1 or 2, wherein the aqueous solution of the anti-mud agent is mixed with the carboxylic acid water reducing agent according to the mass ratio of 10:10 to 10:13 and added into the reclaimed water stabilizer.
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| CN110255957B (en) * | 2019-04-11 | 2021-11-16 | 武汉理工大学 | Building rubbish nanocrystal core and preparation method and application thereof |
| CN110078409A (en) * | 2019-05-17 | 2019-08-02 | 四川恒泽建材有限公司 | High-performance polycarboxylic acids water reducing agent anti-mud agent and preparation method thereof |
| CN111732362A (en) * | 2020-07-07 | 2020-10-02 | 中国水利水电科学研究院 | Cemented sand gravel mud-blocking agent and cemented sand gravel mixture |
| CN114380528A (en) * | 2021-12-21 | 2022-04-22 | 山西佳维新材料股份有限公司 | Anti-mud agent for concrete and preparation method thereof |
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| CN102718430B (en) * | 2012-06-29 | 2014-04-02 | 山东华伟银凯建材科技股份有限公司 | Mud content inhibitor for concrete doped with polycarboxylic acid type water reducer and preparation method and application method of mud content inhibitor |
| CN103466987B (en) * | 2013-09-16 | 2014-07-30 | 石家庄市长安育才建材有限公司 | Composite soil adsorbent for preventing high-content soil in concrete from adsorbing poly-carboxylic water reducer, and preparation method and using method of composite soil adsorbent |
| CN107459282B (en) * | 2017-09-11 | 2020-06-30 | 山东交通学院 | Clay inhibitor with delayed coagulation function and preparation method thereof |
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