CN110041007B - Anti-permeability marble powder composite admixture and application thereof - Google Patents
Anti-permeability marble powder composite admixture and application thereof Download PDFInfo
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- CN110041007B CN110041007B CN201910180976.4A CN201910180976A CN110041007B CN 110041007 B CN110041007 B CN 110041007B CN 201910180976 A CN201910180976 A CN 201910180976A CN 110041007 B CN110041007 B CN 110041007B
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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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- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention provides an anti-permeability marble powder composite admixture and application thereof, wherein the anti-permeability marble powder composite admixture comprises the following components in parts by weight: modified marble powder: 75-90 parts of modified metakaolin: 10-25 parts of rubber powder: 2-6 parts of basalt fiber: 0.5 to 1.5 portions. The anti-permeability marble powder composite admixture is prepared by modifying marble powder and metakaolin and compounding the modified marble powder and metakaolin with rubber powder and basalt fibers, the synergistic effect of the modified marble powder and metakaolin greatly improves the reaction activity of the anti-permeability marble powder composite admixture and cement, and the anti-permeability marble powder composite admixture can form an overlapped and staggered organic-inorganic three-dimensional interpenetrating network structure in concrete when being used for preparing the concrete, so that the pore structure distribution of the concrete is greatly improved, the compactness of the concrete is improved, and the prepared concrete has higher mechanical property and durability.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to an anti-permeability marble powder composite admixture.
Background
In recent years, with the rapid advance of the infrastructure of China, the demand of concrete is increased rapidly, and the dosage of concrete admixture is increased more and more. However, due to the reasons of insufficient resources of high-quality mineral admixtures, uneven distribution in regions and the like, the common admixtures (such as slag, fly ash, volcanic ash and the like) face the current conditions of resource shortage and increased transportation cost, and the problems of high production cost, poor economic benefit and the like of concrete are caused. In response to this situation, it is imperative to find a new concrete mineral admixture that alleviates the problem of shortage of existing admixtures.
The natural marble building board has abundant resources, wide application and huge yield, the yield of the natural marble building board reaches 3.35 hundred million square meters in 2015, the natural marble building board generates waste accounting for about 20 to 50 percent of the original stone in the process of mining and processing, the waste and the environmental pollution problems in the marble industry can be solved by grinding the natural marble building board into concrete mineral admixture, and the green and sustainable development of the concrete industry can be promoted.
The study of the marble powder concrete by scholars at home and abroad shows that in the aspect of physical mechanics, the low-doped marble powder (generally less than 10%) can improve the working performance of the concrete, promote the hydration of cement, and improve the strength of the concrete, especially the early strength. But the concrete strength loss is larger as the mixing amount of the marble powder is continuously increased. In the aspect of durability, impermeability is an important index for representing the durability of concrete, the marble powder can improve the carbonization resistance of the concrete, but the impermeability of the concrete is reduced due to the increase of the porosity and the pore size in the marble powder concrete; meanwhile, the electric flux of the marble powder is increased along with the increase of the doping amount of the marble powder, and the chlorine ion permeation resistance of the marble powder is also reduced.
In conclusion, the available mixing amount of the marble powder in the concrete is small at present, and the impermeability of the concrete is not facilitated, so that the wide application of the marble powder is limited. Therefore, it is necessary to provide a marble powder composite mineral admixture which can improve the durability of concrete on the premise of ensuring good working and mechanical properties.
Disclosure of Invention
In view of the above, the present invention is directed to a permeation-resistant marble powder composite admixture, which solves the problems of low utilization rate of the existing marble powder and poor application effect of the existing marble powder in concrete.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an anti-permeability marble powder composite admixture comprises the following components in parts by weight:
modified marble powder: 75-90 parts of (A) a water-soluble polymer,
modified metakaolin: 10 to 25 parts of (A) a water-soluble polymer,
rubber powder: 2 to 6 parts of (A) a water-soluble polymer,
basalt fiber: 0.5 to 1.5 portions.
Optionally, the modified marble powder is prepared by modifying marble powder with an activator.
Optionally, the method for modifying modified marble powder comprises the following steps:
preparing an excitant solution with the concentration of 50%;
uniformly coating the atomized excitant solution on the surface of the marble powder by adopting a fluidized bed-chemical vapor deposition method, and then drying, crushing and sieving to obtain the modified marble powder.
Optionally, the activator accounts for 1-3% of the total amount of the marble powder.
Optionally, the activator comprises anhydrous sodium sulphate, soda ash, triisopropanolamine; the mass ratio of the anhydrous sodium sulphate to the calcined soda to the triisopropanolamine is (55-65) to (35-40) to (1-3).
Optionally, the modified metakaolin is obtained by modifying metakaolin through a silane coupling agent.
Optionally, the method for modifying modified metakaolin comprises the following steps:
preparing a silane coupling agent into a diluent with the mass concentration of 1.5-3% by using absolute ethyl alcohol;
and (3) soaking metakaolin in the diluent, stirring, heating in a constant-temperature water bath, filtering, and naturally drying to obtain the modified metakaolin.
Optionally, the rubber powder is redispersible vinyl acetate-ethylene copolymer rubber powder.
Another object of the present invention is to provide a use of the above anti-permeation marble powder composite admixture in concrete, wherein the concrete comprises cement; the impervious marble powder composite admixture equivalently replaces 15-30% of cement.
Compared with the prior art, the anti-permeability marble powder composite admixture has the following advantages:
1. the impervious marble powder composite admixture is prepared by modifying the marble powder and the metakaolin and compounding the modified marble powder and the rubber powder and the basalt fiber, so that the modified marble powder has high activity, the agglomeration effect of the modified metakaolin is effectively reduced, meanwhile, the basalt fiber can form a three-dimensional disorderly distribution network system in the concrete to play a fiber bridging effect, the rubber powder can be transformed into polymer gel along with cement slurry to fill cement gaps, the synergistic effect of the rubber powder and the polymer gel greatly improves the reaction activity of the impervious marble powder composite admixture and the cement, and the impervious marble powder composite admixture can form a superposed and staggered organic-inorganic three-dimensional interpenetrating network structure in the concrete when being used for preparing the concrete, thereby greatly improving the pore structure distribution of the concrete and improving the compactness of the concrete, and further the prepared concrete has higher mechanical property and durability.
2. The anti-permeability marble powder composite admixture is prepared by compounding modified marble powder, modified metakaolin compound rubber powder and basalt fiber, wherein the modified marble powder and the modified metakaolin have good morphological effect and filling effect, and when the anti-permeability marble powder composite admixture is used for preparing concrete, the grading of a cementing material in the concrete can be optimized, so that the pore structure of the concrete can be further improved, the compactness of the concrete can be improved, and the mechanical property and the durability of the prepared concrete can be further improved.
3. The anti-permeability marble powder composite admixture provided by the invention takes modified marble powder as a main raw material, the proportion of the amount of the modified marble powder in the anti-permeability marble powder composite admixture can reach more than 85%, the anti-permeability marble powder composite admixture provided by the invention can be used for preparing concrete, the substitution amount of the anti-permeability marble powder composite admixture for cement can reach 30%, namely the utilization rate of the marble powder in the concrete can reach more than 25%, and therefore, the problem of high added value utilization of the marble powder is solved, the environmental pollution is avoided, and the problem of resource shortage in the concrete industry is facilitated.
Detailed Description
The marble powder has good morphological effect and filling effect, can obviously improve the working performance of concrete, but has low activity, is not beneficial to the development of concrete strength and limits the application of the marble powder in the concrete; metakaolin is a silicon-aluminum amorphous active material, can generate a pozzolanic reaction with a cement hydration product to generate gel, and improves the strength of concrete, but has larger surface energy, easy agglomeration and larger water demand, and is unfavorable for the working performance of concrete; the basalt fibers have natural compatibility with concrete, the basalt fibers are good in dispersibility in the concrete, and the uniformly dispersed basalt fibers form a three-dimensional disorderly distribution network system in the concrete to play a fiber bridging effect, so that the basalt fibers can support aggregates and penetrate through microcracks, the microcracks are effectively prevented from developing, and the impermeability and crack resistance of the concrete are improved; the redispersible latex powder is dissolved in water to form polymer emulsion, polymer gel is gradually filled in cement stone pores and forms a layer of polymer film along with the hydration of cement, and meanwhile, active groups in the polymer can react with hydration products to form a superposed and staggered three-dimensional network structure, so that the bonding force of the cement, aggregate and fiber is improved, the interface combination is improved, the development of microcracks is effectively inhibited, and the impermeability of concrete is improved. Based on the method, the anti-permeability marble powder composite admixture is prepared by compounding the basalt fiber and the redispersible latex powder after modifying the marble powder and the metakaolin, so that the application effect of the marble powder in concrete is improved, and the utilization rate of the marble powder in the concrete is further improved.
Among them, in the present invention, in order to improve the activity of the marble powder and metakaolin, the specific surface area of the marble powder is preferably not less than 600m2/kg, D50 is preferably not more than 10 μm, SiO in metakaolin2With Al2O3The mass percentage content is preferably not less than 95%, and the surface area is preferably not less than 1350m2The basalt fiber has the filament diameter of preferably 13-16 mu m, the length-diameter ratio of preferably more than 1000, the elastic modulus of preferably more than 95GPa, and the elongation at break of preferably not less than 2% in order to ensure that the basalt fiber has a good dispersing effect in concrete.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail with reference to examples.
Example 1
An anti-permeability marble powder composite admixture (MI) comprises the following components in parts by weight:
modified marble powder: 75 parts of (a) a water-soluble polymer,
modified metakaolin: 25 parts of (a) to (b),
rubber powder: 3 parts of (a) to (b),
basalt fiber: 1 part.
Wherein the rubber powder is redispersible vinyl acetate-ethylene copolymer rubber powder, and the solid content is more than 98 percent; the basalt fiber preferably has a filament diameter of 15 μm, a length of 18mm, an elastic modulus of more than 95GPa, and an elongation at break of not less than 2%.
In this embodiment, the method for modifying marble powder includes the following steps:
preparing an excitant solution with the concentration of 50% in an ultrasonic disperser, wherein the excitant for preparing the excitant solution comprises anhydrous sodium sulphate, calcined soda and triisopropanolamine; the mass ratio of the anhydrous sodium sulphate to the calcined soda to the triisopropanolamine is 60: 38: 2;
uniformly coating an excitant solution atomized by an atomizer on the surface of marble powder in a fluidized bed by adopting a fluidized bed-chemical vapor deposition method, then collecting the powder, and drying, crushing and sieving the collected powder to obtain the modified marble powder, wherein the excitant accounts for 1% of the total amount of the marble powder, and the specific surface area of the marble powder is preferably 667m2The D50 is preferably 8.52. mu.m/kg.
In the embodiment, the surface modification is carried out on the marble powder by a fluidized bed-chemical vapor deposition method, the exciting agent is uniformly coated on the surface of the marble powder to form a nano modification layer, and the activity of the marble powder can be effectively improved, so that the activity of SiO in cement slurry and the activity of metakaolin can be improved2With active Al2O3Ca (OH) for pozzolanic reactions to take place2The amount of the activator is further beneficial to increasing the generation amount of gels such as CSH and CASH and the like which can fill concrete pores in the concrete, so that the mechanical property and the durability of the concrete are improved, meanwhile, the anhydrous sodium sulphate and the triisopropanolamine in the activator have good early strength effect, the cement hydration can be promoted, the generation amount of hydration products is further increased, and the mechanical property and the durability of the concrete are further improved.
Further, in this example, the modification method of modified metakaolin includes the steps of:
preparing a silane coupling agent into a diluent with the mass concentration of 3% by using absolute ethyl alcohol;
soaking metakaolin in the diluent, placing in a constant temperature water tank at 40 deg.C, stirring at medium speed for 45min, filtering, and naturally air drying to obtain modified metakaolin with specific surface area of 1350m2/kg。
In the bookIn the embodiment, the metakaolin is modified by the silane coupling agent, so that the agglomeration effect of the metakaolin can be effectively reduced, and the hydration products Ca (OH) in concrete can be improved2The volcanic ash reaction efficiency of the metakaolin is improved, the mechanical property and the durability of the concrete are further improved, the water requirement of the metakaolin can be reduced due to the improvement of the agglomeration effect of the metakaolin, the working performance of the concrete is further improved, meanwhile, when the metakaolin is hydrated, the volcanic ash reaction efficiency of the metakaolin and the cement can be further improved due to the hydrophilic characteristic of the silane coupling agent, and in addition, the silane coupling agent can enhance the bonding capability of hardened concrete particles, so that the mechanical property of the concrete is improved.
Example 2
The present embodiment differs from the above embodiments in that: the anti-permeability marble powder composite admixture (MII) comprises the following components in parts by weight:
modified marble powder: 83 parts of (a) to (b),
modified metakaolin: 17 parts of (a) to (b),
rubber powder: 4, preparing 4 parts of the mixture,
basalt fiber: 0.5 part.
In the modification process of the marble powder, the excitant accounts for 1.5 percent of the total amount of the marble powder.
In the modification process of metakaolin, anhydrous ethanol is used for preparing a silane coupling agent into a diluent with the mass concentration of 2%.
Example 3
The present embodiment differs from the above embodiments in that: the anti-permeability marble powder composite admixture (MIII) of the embodiment comprises the following components in parts by weight:
modified marble powder: 90 parts of (a) a mixture of (b),
modified metakaolin: 10 parts of (a) to (b),
rubber powder: 6 parts of (a) a mixture of (b),
basalt fiber: 1.5 parts.
In the modification process of the marble powder, the excitant accounts for 3 percent of the total amount of the marble powder.
In the modification process of metakaolin, the silane coupling agent is prepared into a diluent with the mass concentration of 1.5% by using absolute ethyl alcohol.
The application effect of the anti-permeability marble powder composite admixture of the examples 1 to 3 in concrete is tested, and the anti-permeability marble powder composite admixture is compared with a marble powder composite admixture of a comparative example, wherein the marble powder and metakaolin in the marble powder composite admixture (DM) of the comparative example are not modified, and the raw material ratio is the same as that of the example 1. The formulation ratios of concrete prepared from the anti-permeability marble powder composite admixtures of examples 1 to 3 and the marble powder composite admixtures of comparative examples are shown in table 1. In the table 1, the cement is P.O 42.5 grade, the sand is intermediate sand in the interval II, the fineness modulus is 2.4, the broken stone is 5-25mm continuous gradation, and the water reducing agent is a polycarboxylic acid water reducing agent with the solid content of 20%.
TABLE 1
The mechanical properties and durability of the concrete in Table 1 were tested according to GB/T50080-2016 concrete mixture property test method and GB/T50081-2016 concrete mechanical property test method, and the test results are shown in Table 2.
TABLE 2
As can be seen from Table 2, compared with the single-doped marble powder (blank 2), the slump of the concrete mixture prepared by the admixtures of examples 1-3 is slightly reduced, but is still far higher than that of the concrete mixture of blank 1, and the working performance of the concrete can be obviously improved by the admixtures of examples 1-3. Compared with the admixture of the comparative example, the admixture of the example 1 to the example 3 has higher activity, and the strength of the formulated concrete at each age develops better and even exceeds the strength of the blank group.
The deformation performance (shrinkage) and impermeability of the concrete in table 1 were tested according to GBT50082-2009 test method for long-term performance and durability of ordinary concrete, and the test results are shown in table 3.
TABLE 3
As can be seen from Table 3, the incorporation of 15-30% of the admixtures of examples 1-3 reduced the dry shrinkage of the concrete and improved the impermeability of the concrete. Compared with the admixture of the comparative example, the admixture of the example 1 to the example 3 obviously reduces the drying shrinkage rate of concrete and improves the insufficient impermeability of marble powder concrete on the premise of ensuring the working performance and the mechanical property of the concrete. The concrete impermeability grades of the embodiments 1 to 3 are all more than P10, and compared with the concrete impermeability coefficient of the blank group, the concrete impermeability grade is reduced by 30-70%.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The anti-permeability marble powder composite admixture is characterized by comprising the following components in parts by weight:
modified marble powder: 75-90 parts of (A) a water-soluble polymer,
modified metakaolin: 10 to 25 parts of (A) a water-soluble polymer,
rubber powder: 2 to 6 parts of (A) a water-soluble polymer,
basalt fiber: 0.5-1.5 parts;
the modified marble powder is prepared by modifying marble powder through an excitant;
the modification method of the modified marble powder comprises the following steps:
preparing an excitant solution with the concentration of 50%;
uniformly coating the atomized excitant solution on the surface of the marble powder by adopting a fluidized bed-chemical vapor deposition method, and then drying, crushing and sieving to obtain modified marble powder;
the modified metakaolin is prepared by modifying metakaolin through a silane coupling agent;
the modification method of the modified metakaolin comprises the following steps:
preparing a silane coupling agent into a diluent with the mass concentration of 1.5-3% by using absolute ethyl alcohol;
soaking metakaolin in the diluent, stirring, heating in a constant-temperature water bath, filtering, and naturally drying to obtain modified metakaolin;
the excitant accounts for 1-3% of the total amount of the marble powder;
the excitant comprises anhydrous sodium sulphate, soda ash and triisopropanolamine; the mass ratio of the anhydrous sodium sulphate to the calcined soda to the triisopropanolamine is (55-65) to (35-40) to (1-3).
2. The permeation-resistant marble powder composite admixture of claim 1, wherein the rubber powder is redispersible vinyl acetate-ethylene copolymer rubber powder.
3. Use of the permeation-resistant marble powder composite admixture of any one of claims 1 to 2 in concrete, wherein the concrete comprises cement; the impervious marble powder composite admixture equivalently replaces 15-30% of cement.
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| CN112194403B (en) * | 2020-10-10 | 2022-02-15 | 厦门安能建设有限公司 | Additive, preparation method thereof and composite cement paste for improving impermeability of weak soil |
| CN114804717A (en) * | 2022-03-31 | 2022-07-29 | 湖北工业大学 | Sulfate-corrosion-resistant waterproof mortar and preparation method thereof |
| CN115849764B (en) * | 2022-11-25 | 2023-10-27 | 四川沃庆新材料科技有限公司 | Sprayed concrete admixture and preparation method and application thereof |
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| CN102659336A (en) * | 2012-04-18 | 2012-09-12 | 中南大学 | Modified limestone powder-based mineral admixture and preparation method thereof |
| CN103553399B (en) * | 2013-11-09 | 2016-02-17 | 福建福能建筑材料科技开发有限责任公司 | A kind of for the complex mineral blending material in cement and concrete |
| KR101436780B1 (en) * | 2014-05-16 | 2014-09-02 | 이동우 | Mortar composition for repairing and reinforcing underwater concrete structures with increased durability and adhesion property, and method of repairing and reinforcing underwater concrete structures using the same |
| CN105731888A (en) * | 2014-12-10 | 2016-07-06 | 天津裕丰源环保科技有限公司 | High-strength waste rock powder aerated concrete block |
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