CN105084798B - Concrete sulfate-corrosion-resistant additive and preparation method thereof - Google Patents
Concrete sulfate-corrosion-resistant additive and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a concrete sulfate-corrosion-resistant additive and a preparation method thereof, and belongs to the technical field of civil engineering materials. The concrete sulfate-corrosion-resistant additive mainly comprises, by mass, 30-50% of barium-based modified bentonite, 20-40% of nanometer kaolin/metakaolin, 20-30% of water talcum powder and 10-15% of solid water glass. The preparation method includes the steps of evenly mixing barium-based modified bentonite, nanometer kaolin/metakaolin, water talcum powder and solid water glass in proportion, placing the mixture in a grinding machine to be ground till the specific surface area of the ground powder reaches 400 m＜2＞/kg or above, and conducting bagging and sealing. By means of the concrete sulfate-corrosion-resistant additive and the preparation method, the sulfate corrosion resistance of concrete can be improved, the compressive strength of concrete can be improved, the concrete hole structure and compactness are improved, and the durability of concrete is improved. The prepared additive has the advantages of being long in timeliness, free of toxin and environment pollution, simple in preparation process and low in cost.
Description
Technical field
The invention belongs to civil engineering material technical field, and in particular to a kind of Concrete Resist Reinforcing Sulfate Corrosion additive and
Its preparation method.
Background technology
Concrete material with its comprcssive strength it is high, fire resistance is good, use is flexible, easy construction the advantages of become the world today
Upper purposes most one of maximum construction material of wide, consumption, plays the irreplaceable effect of other materials and function.But, by
It is not fully closely knit in concrete itself, there are many capillary channels inside it, when xoncrete structure is exposed to containing sulphuric acid
When in the environment and medium of salt, just can suffer from sulfate attack and destroy.Particularly in western part of China salty area and east
Coastal area, the sulfate attack destruction of concrete is the most serious and universal, and to national economic development very big waste is caused, because
The research that this carries out Concrete Resist Reinforcing Sulfate Corrosion is significant.
The more commonly used and method that effectively suppress sulfate attack is to add preservative in concrete in engineering, mesh
Before, with regard to the research of sulfate corrosion-resistance preservative for concrete, there are reports.Such as, patent CN102923991A is disclosed
A kind of Concrete multifunctional corrosion remover, is made up of the mixing of following match ratio：Component A：Opposing sulfate, 30 parts of carbonate material；B
Component：20 parts of opposing villaumite material；Component C：10 parts of anti-crack and anti-seepage material；D components：3 parts of freeze proof material；E increases strength materials
10 parts；F components：Improve 17 parts of concrete flowability material；G components：Improve 10 parts of degree of compaction material.Although the preservative is basic
Cover the various aspects of Durability of Concrete, however, specific aim is not strong, and its composition material species is excessive, preparation process
It is relatively complicated.Also some researchs can be used as agent on crack resistance of concrete sulphuric acid salt contamination using mineral admixtures such as flyash, breeze and silicon ashes
The preservative of erosion, but this kind of preservative effectiveness is not very good, and the reduction of other performances of concrete is even resulted in sometimes,
It is unfavorable for the raising of concrete durability.In addition, there is some to invade salt and high molecular polymerization species as sulfuric-resisting salt
The report of the additive of erosion, but this kind of preservative is ageing also very short, and the reduction of fresh concrete workability is easily caused,
The later strength and durability of final impact concrete, it could even be possible to causing environmental pollution.Therefore, it is badly in need of research one kind to prepare
Process is simple, cost is relatively low, ageing longer, and can fundamentally improve the additive product of Concrete Resist Reinforcing Sulfate Corrosion ability
Product.
The content of the invention
Goal of the invention：It is an object of the invention to solve the problems, such as to be mentioned in above-mentioned background technology, there is provided one kind prepares work
Skill is simple, cost is relatively low, ageing longer Concrete Resist Reinforcing Sulfate Corrosion additive, fundamentally improves agent on crack resistance of concrete sulphuric acid
The ability of salt corrosion, another object of the present invention is to provide the preparation method of the additive and application.
Technical scheme：The invention provides a kind of Concrete Resist Reinforcing Sulfate Corrosion additive, wherein it is swollen to be modified containing bario
Profit soil, Kaolin, hydrotalcite powder and solid sodium silicate.
Specifically, additive of the present invention, by mass percentage, each component content is：Bario modified alta-mud
30～50%；Nano kaoline/metakaolin 20～40%；Hydrotalcite powder 20～30%；Solid sodium silicate 10～15%.
The specific surface area of the bario modified alta-mud is more than 400m2/ kg, wherein smectite content are more than 80%.Bario
The crystal structure characteristic of the main component of modified alta-mud presss from both sides one layer of alumina octahedral and constitutes 2 by two-layer silicon-oxy tetrahedron:1 type layer
Shape silicate, 2:1 type silicate layer and another layer of silicon-oxy tetrahedron press from both sides one layer of barium ions and constitute.In aqueous, this layer of barium from
Son can be detached becomes free ion, and the free barium ionss for detaching can be combined with sulfate ion and precipitated, and play solidification sulfur
The effect of acid ion.Above-mentioned bario modified alta-mud is adopted and is obtained with the following method：By bentonite and brium carbonate roasting, take out
It is placed in drying baker and is cooled to room temperature, grinding is obtained activation compound powder, adds deionized water that the slurry that concentration is 10% is obtained
Potassium pyrophosphate, barium nitrate and appropriate dust technology are stirred and added in material, vibration, make slurry pH reach 7.0 or so, continue to vibrate
Agitation and filtration, ground 200 mesh sieve after baking is obtained bario modified alta-mud.
Described Kaolin is nano kaoline or metakaolin, and its whiteness is more than 90%, and particle mean size is less than 1 μm.Receive
Rice Kaolin/metakaolin is the anionic property clay of layer structure, and itself has very strong adsorptivity, particularly to metal sun
The absorption of ion, therefore its addition can effectively suppress free, the free calcium ions in reduction hole solution of calcium ion in concrete
Concentration, reduce Gypsum Fibrosum generation, suppress sulfate attack generation.
The hydrotalcite powder whiteness is more than 90%, and particle mean size is less than 0.8 μm.Hydrotalcite powder belongs to a kind of stratiform chemical combination
Thing, because its main layer board carries positive charge, in aqueous adsorbable free anion, forms stable material, it
Addition can effectively suppress diffusion and migration of the sulfate ion in concrete hole solution.
The invention combines above-mentioned raw materials, obtain it is a kind of can effective resisting erosion of sulfate concrete addition
Agent, meanwhile, solid sodium silicate is added, bentonite, nano kaoline, metakaolin and water can be provided after solid sodium silicate aquation
Alkali needed for the aquations such as Pulvis Talci point, the loss of strength that compensating concrete is caused due to adding preservative to reduce cement consumption.
The modulus scope of the solid sodium silicate is 2.5～3.5.
Present invention also offers the preparation method of the Concrete Resist Reinforcing Sulfate Corrosion additive, is by bario bentone
Soil, Kaolin, hydrotalcite powder and solid sodium silicate uniformly mix, then mixture is placed in into grinding in grinder, to abrasive flour
Specific surface area reaches 400m2After/more than kg, product is obtained.The Kaolin is nano kaoline or metakaolin.
Present invention also offers the Concrete Resist Reinforcing Sulfate Corrosion additive is applied in concrete, its volume is coagulation
The 5%～15% of native Binder Materials gross mass.
Beneficial effect：1, raw material of the present invention is inorganic salts mineral oxide and hydroxide, mixed
When applying in solidifying soil, can not only fundamentally suppress the sulfate attack of concrete, improve Concrete Resist Reinforcing Sulfate Corrosion
Ability, and the aquation of its own contained mineralogical composition can with the loss of strength of compensating concrete, with it is effective long the characteristics of.
2, belonging to layer structure raw material of the present invention, with good water absorption, in concrete mixing more
The isolation of concrete can be prevented, pouring after maintenance it can discharge adsorbed moisture, improve the pore structure of concrete and closely knit
Property, the early-age shrinkage and cracking of concrete are reduced, improve the durability of concrete.
3, raw material of the present invention belongs to the mineral raw materials being widely present in nature, is readily available, nontoxic,
And environment is not had undesirable effect.
4, the additive preparation process is simple of the present invention, cost is relatively low, the additive prepared using the present invention, concrete
Sulphate-corrosion resistance can be significantly improved, and Concrete Resist Reinforcing Sulfate Corrosion coefficient fully meets up to more than 0.85《It is mixed
Solidifying soil sulfur resistive acids corrodes preservative》Regulation and requirement in (JCT 1011-2006).
Specific embodiment：
Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1
A kind of Concrete Resist Reinforcing Sulfate Corrosion additive, each component and its mass percent it is as follows：
Bario modified alta-mud：30%, its specific surface area is 430m2/ kg, smectite content is 87%；Nano kaoline/
Metakaolin：40%, its whiteness is 92%, and particle mean size is 0.5 μm；Hydrotalcite powder 20%, its whiteness is 95%, particle mean size
For 0.5 μm；Solid sodium silicate：10%, its modulus is 3.0.
A kind of preparation method of Concrete Resist Reinforcing Sulfate Corrosion additive is as follows：
By bario modified alta-mud, nano kaoline/metakaolin, hydrotalcite powder and solid sodium silicate it is equal according to the above ratio
Even mixing, and mixture is placed in grinding in grinder, and to abrasive flour specific surface area 400m is reached2Pack sealing after/more than kg.
The performance test of the present embodiment according to《Agent on crack resistance of concrete sulfuric acid corrodes preservative》Regulation in (JCT 1011-2006)
Requirement and test method be measured.Wherein cement uses the silicate of Carnis Rapanae thomasianae board P II 42.5 of Chinese cement factory production
Cement, sand uses the normal sand that GB/T 17671-1999 specify, test water is tap water.During test, concrete sulfur resistive
Hydrochlorate corrodes the volume of additive and accounts for the 10% of concrete gel material quality, and the attack solution for being adopted is for 5%Na2SO4It is molten
Liquid, its correlated performance test result is as follows：
Suppress intensity：7d comprcssive strength rate 99%, 28d comprcssive strength rate 112%；
Corrosion resistance：Coefficient against corrosion 0.89, the coefficient of expansion 1.17.
Embodiment 2
A kind of Concrete Resist Reinforcing Sulfate Corrosion additive, each component and its mass percent it is as follows：
Bario modified alta-mud：40%, its specific surface area is 450m2/ kg, smectite content is 91%；Nano kaoline/
Metakaolin：30%, its whiteness is 93%, and particle mean size is 0.7 μm；Hydrotalcite powder 20%, its whiteness is 92%, particle mean size
For 0.7 μm；Solid sodium silicate 10%, its modulus is 2.5.
A kind of preparation method of Concrete Resist Reinforcing Sulfate Corrosion additive is as follows：
By bario modified alta-mud, nano kaoline/metakaolin, hydrotalcite powder and solid sodium silicate it is equal according to the above ratio
Even mixing, and mixture is placed in grinding in grinder, and to abrasive flour specific surface area 400m is reached2Pack sealing after/more than kg.
The performance test of the present embodiment according to《Agent on crack resistance of concrete sulfuric acid corrodes preservative》Regulation in (JCT 1011-2006)
Requirement and test method be measured.Wherein cement uses the silicate of Carnis Rapanae thomasianae board P II 42.5 of Chinese cement factory production
Cement, sand uses the normal sand that GB/T 17671-1999 specify, test water is tap water.During test, concrete sulfur resistive
Hydrochlorate corrodes the volume of additive and accounts for the 10% of concrete gel material quality, and the attack solution for being adopted is for 5%Na2SO4It is molten
Liquid, its correlated performance test result is as follows：
Suppress intensity：7d comprcssive strength rate 107%, 28d comprcssive strength rate 119%；
Corrosion resistance：Coefficient against corrosion 0.94, the coefficient of expansion 1.08.
Embodiment 3
A kind of Concrete Resist Reinforcing Sulfate Corrosion additive, each component and its mass percent it is as follows：
Bario modified alta-mud：50%, its specific surface area is 480m2/ kg, smectite content is 93%；Nano kaoline/
Metakaolin：20%, its whiteness is 91%, and particle mean size is 0.5 μm；Hydrotalcite powder 20%, its whiteness is 95%, particle mean size
For 0.4 μm；Solid sodium silicate 10%, its modulus is 3.5.
A kind of preparation method of Concrete Resist Reinforcing Sulfate Corrosion additive is as follows：
By bario modified alta-mud, nano kaoline/metakaolin, hydrotalcite powder and solid sodium silicate it is equal according to the above ratio
Even mixing, and mixture is placed in grinding in grinder, and to abrasive flour specific surface area 400m is reached2Pack sealing after/more than kg.
The performance test of the present embodiment according to《Agent on crack resistance of concrete sulfuric acid corrodes preservative》Regulation in (JCT 1011-2006)
Requirement and test method be measured.Wherein cement uses the silicate of Carnis Rapanae thomasianae board P II 42.5 of Chinese cement factory production
Cement, sand uses the normal sand that GB/T 17671-1999 specify, test water is tap water.During test, concrete sulfur resistive
Hydrochlorate corrodes the volume of additive and accounts for the 10% of concrete gel material quality, and the attack solution for being adopted is for 5%Na2SO4It is molten
Liquid, its correlated performance test result is as follows：
Suppress intensity：7d comprcssive strength rate 101%, 28d comprcssive strength rate 115%；
Corrosion resistance：Coefficient against corrosion 0.97, the coefficient of expansion 0.95.
Embodiment 4
A kind of Concrete Resist Reinforcing Sulfate Corrosion additive, each component and its mass percent it is as follows：
Bario modified alta-mud：40%, its specific surface area is 470m2/ kg, smectite content is 93%；Nano kaoline/
Metakaolin：20%, its whiteness is 92%, and particle mean size is 0.6 μm；Hydrotalcite powder 25%, its whiteness is 94%, particle mean size
For 0.5 μm；Solid sodium silicate：15%, its modulus is 3.3.
A kind of preparation method of Concrete Resist Reinforcing Sulfate Corrosion additive is as follows：
By bario modified alta-mud, nano kaoline/metakaolin, hydrotalcite powder and solid sodium silicate it is equal according to the above ratio
Even mixing, and mixture is placed in grinding in grinder, and to abrasive flour specific surface area 400m is reached2Pack sealing after/more than kg.
The performance test of the present embodiment according to《Agent on crack resistance of concrete sulfuric acid corrodes preservative》Regulation in (JCT 1011-2006)
Requirement and test method be measured.Wherein cement uses the silicate of Carnis Rapanae thomasianae board P II 42.5 of Chinese cement factory production
Cement, sand uses the normal sand that GB/T 17671-1999 specify, test water is tap water.During test, concrete sulfur resistive
Hydrochlorate corrodes the volume of additive and accounts for the 5% of concrete gel material quality, and the attack solution for being adopted is for 5%Na2SO4Solution,
Its correlated performance test result is as follows：
Suppress intensity：7d comprcssive strength rate 98%, 28d comprcssive strength rate 108%；
Corrosion resistance：Coefficient against corrosion 0.89, the coefficient of expansion 1.21.
Embodiment 5
A kind of Concrete Resist Reinforcing Sulfate Corrosion additive, each component and its mass percent it is as follows：
Bario modified alta-mud：35%, its specific surface area is 460m2/ kg, smectite content is 91%；Nano kaoline/
Metakaolin：20%, its whiteness is 91%, and particle mean size is 0.8 μm；Hydrotalcite powder 30%, its whiteness is 92%, particle mean size
For 0.7 μm；Solid sodium silicate：15%, its modulus is 2.8.
A kind of preparation method of Concrete Resist Reinforcing Sulfate Corrosion additive is as follows：
By bario modified alta-mud, nano kaoline/metakaolin, hydrotalcite powder and solid sodium silicate it is equal according to the above ratio
Even mixing, and mixture is placed in grinding in grinder, and to abrasive flour specific surface area 400m is reached2Pack sealing after/more than kg.
The performance test of the present embodiment according to《Agent on crack resistance of concrete sulfuric acid corrodes preservative》Regulation in (JCT 1011-2006)
Requirement and test method be measured.Wherein cement uses the silicate of Carnis Rapanae thomasianae board P II 42.5 of Chinese cement factory production
Cement, sand uses the normal sand that GB/T 17671-1999 specify, test water is tap water.During test, concrete sulfur resistive
Hydrochlorate corrodes the volume of additive and accounts for the 15% of concrete gel material quality, and the attack solution for being adopted is for 5%Na2SO4It is molten
Liquid, its correlated performance test result is as follows：
Suppress intensity：7d comprcssive strength rate 103%, 28d comprcssive strength rate 118%；
Corrosion resistance：Coefficient against corrosion 0.90, the coefficient of expansion 1.04.
The agent on crack resistance of concrete for filling additive of the present invention is can be seen that from the intensity test result of above-mentioned five embodiments
Compressive Strength has been lifted, and particularly in the maintenance later stage, concrete crushing strength lifts effect substantially,
Concrete Resist Reinforcing Sulfate Corrosion ability is can be seen that from the corrosion resistance test result of above-mentioned five embodiments to obtain
It is obviously improved, is satisfied by《Agent on crack resistance of concrete sulfuric acid corrodes preservative》Indices requirement in (JCT 1011-2006), this
Bright Concrete Resist Reinforcing Sulfate Corrosion additive has good resisting erosion of sulfate effect.
Claims (7)
1. a kind of Concrete Resist Reinforcing Sulfate Corrosion additive, it is characterised in that wherein containing bario modified alta-mud, Kaolin, water
Pulvis Talci and solid sodium silicate；By mass percentage, each component content is：Bario modified alta-mud 30～50%；Kaolin
20～40%；Hydrotalcite powder 20～30%；Solid sodium silicate 10～15%；
Described bario modified alta-mud is adopted and is obtained with the following method：Bentonite and brium carbonate roasting, taking-up are placed on into drying baker
In be cooled to room temperature, grinding is obtained activation compound powder, adds deionized water that the slurry that concentration is 10%, vibration stirring is obtained
And potassium pyrophosphate, barium nitrate and dust technology are added, and make slurry pH reach 7.0, continue to vibrate agitation and filtration, it is ground after baking
200 mesh sieves, are obtained bario modified alta-mud.
2. additive as claimed in claim 1, it is characterised in that the specific surface area of the bario modified alta-mud is more than 400m2/
Kg, wherein smectite content are more than 80%.
3. additive as claimed in claim 1, it is characterised in that described Kaolin is nano kaoline or metakaolin, its
Whiteness is more than 90%, and particle mean size is less than 1 μm.
4. additive as claimed in claim 1, it is characterised in that the hydrotalcite powder whiteness is more than 90%, and particle mean size is less than
0.8μm。
5. additive as claimed in claim 1, it is characterised in that the modulus scope of the solid sodium silicate is 2.5～3.5.
6. the preparation method of Concrete Resist Reinforcing Sulfate Corrosion additive as claimed in claim 1, it is characterised in that bario is modified
Bentonite, Kaolin, hydrotalcite powder and solid sodium silicate uniformly mix, then mixture is placed in into grinding in grinder, to grinding
Specific Surface Area Measurement reaches 400m2After/more than kg, product is obtained.
7. a kind of Concrete Resist Reinforcing Sulfate Corrosion additive in Claims 1 to 5 described in any one is applied in concrete,
Its volume is the 5%～15% of concrete gel material gross mass.
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| CN107651871B (en) * | 2016-07-26 | 2020-02-07 | 焦作师范高等专科学校 | Bismuth (III) modified bentonite, modification method of bismuth (III) modified composite bentonite and application of bismuth (III) modified composite bentonite |
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| CN109628104B (en) * | 2018-11-30 | 2020-11-10 | 宁夏大学 | Modifying agent for modifying sulfate saline soil |
| CN109608141B (en) * | 2019-01-23 | 2021-04-30 | 内蒙古工业大学 | Salt erosion resistant concrete and preparation method thereof |
| CN109704602A (en) * | 2019-02-22 | 2019-05-03 | 武汉理工大学 | Cementitious material and preparation method without entringite in a kind of hydrated product |
| CN110255963B (en) * | 2019-06-14 | 2020-07-17 | 河海大学 | Preparation method of modified hydrotalcite-like concrete anti-sulfate corrosion preservative |
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