CN1868957A - Disruption inhibiting material of concrete sulphate crystal - Google Patents

Disruption inhibiting material of concrete sulphate crystal Download PDF

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Publication number
CN1868957A
CN1868957A CNA2006100274350A CN200610027435A CN1868957A CN 1868957 A CN1868957 A CN 1868957A CN A2006100274350 A CNA2006100274350 A CN A2006100274350A CN 200610027435 A CN200610027435 A CN 200610027435A CN 1868957 A CN1868957 A CN 1868957A
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China
Prior art keywords
concrete
sulphate crystal
air entrapment
water reducer
inhibiting material
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Application number
CNA2006100274350A
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Chinese (zh)
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CN100400456C (en
Inventor
杨钱荣
杨全兵
朱蓓蓉
张树青
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Tongji University
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Tongji University
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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
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/2015—Sulfate resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

A depressant for suppressing the destroy of sulfate crystallizing to concrete is prepared from the water reducing agent chosen from lignosulfonate, beta-methyl naphthalenesulfonate polycondensate, melamine formaldehyde polycondensate and polycarboxylate, the aerating agent chosen from triterpene saponin surfactant, rosin resin type sodium salt, salt of fatty acid, sulfonated carbohydrate, and alkyl-phenylmethyl sulfonate, and the active additive chosen from powdered coal ash, slag powder, silicon ash and coal gangue powder.

Description

Disruption inhibiting material of concrete sulphate crystal
Technical field
The invention belongs to building material technical field, be specifically related to a kind of disruption inhibiting material of concrete sulphate crystal.
Background technology
Sulphate attack is one of topmost form that influences concrete durability, in railway, highway, mine and hydroelectric project, all find the sulphate attack problem of underground water to concrete structure, the safe operation that seriously jeopardizes buildings that has, some preventing engineerings, the part Tunnel Engineering of Chengdu-Kunming railway, the geographic highway engineering in salt lake, Qinghai as Qinghai Province, concrete structure was less than just collapse fully in a year in salt lake brine and saline soil, at salt lake brine or position, saline soil boundary, concrete corrosion speed is faster.The concrete sulphate erosion problem has received the concern of academia and engineering, but compare with the research of concrete other weather resistance such as frost resistance, carbonization, steel bar corrosion, alkali, relatively weak to the concrete sulphate Study on corrosion, in the research process and the convictive viewpoint of the also more difficult apparatus of some phenomenons that occur in the actual engineering explain.Because research method and means of testing are different, the researchist does not form consensus to the many problems of sulphate attack destructive, have in addition completely contradict.Some engineering units are not enough to the mechanism of sulphate attack understanding, and are improper because of the material design handling and repairing when suffering the sulphate attack concrete structure, can not achieve the desired result.
Think all that generally the expansion of ettringite and gypsum causes the main reason of concrete sulphate destructive.Sulphate attack can reduce following several collapse mode: 1. the expansion damage that is caused by ettringite.Positively charged ion in the sulfate liquor is that the ion of solubility is (as Na +, K +) time, vitriol and C 3The A reaction generates ettringite, and the generation of ettringite is considered to volume has increased by 2.5 times, causes the generation of expansion stress, and concrete cracking is destroyed.In fact by Na 2SO 4, Ca 2SO 4Or MgSO 4The salt crystallization that causes also is the major reason that causes the concrete sulphate erosion damage, and this problem of saline and alkaline area and littoral area is more outstanding in western part.In natural environment for use, the salt crystallization causes that porous material such as surface deteriorations such as concrete and stone material are common phenomena, wherein with Na 2SO 4The destruction that causes is the most general and serious.
It is very little to carry out the test specimen length variations that drying and watering cycle causes in fresh water, will cause that the rate of expansion of test specimen increases gradually yet carry out drying and watering cycle in sulfate liquor, and salt concn is higher, and it is faster to gather way.Our normal concrete that studies show that C40 is at 10%Na 2SO 4Soaked 180 days in the solution, ultimate compression strength is lost very little even is increased, at Na 2SO 4In the solution and through after 14 drying and watering cycles, ultimate compression strength loss 60%, folding strength loss 35%, concrete completely destroy after 18 circulations.
In addition, Na 2SO 4The solubleness temperature influence very big, when temperature reduces, be easy to Na 2SO 410H 2The O crystallization is pressed producing bigger volumetric expansion and salt crystallization.Along with Na 2SO 4The temperature that the increase of concentration, salts solution begin to produce volumetric expansion also improves, and reaches degree of supersaturation and crystallization promptly easilier, and its salt crystallographic expansion rate also significantly improves.
For the prophylactico-therapeutic measures of sulphate attack, adopt control C mostly 3A, C 3Methods such as S content and admixture active admixture are prevented the sulphate attack that is caused by ettringite and gypsum; China's cement standard regulation, the C of sulphate-resistant cement 3A content should be less than 5%, C 3A+C 4AF＜22%, C 3S＜50%, advanced sulfur-resistant acid salt cement C 3A＜3.5%.The Ministry of Construction of up-to-date promulgation and Ministry of Railways concrete structure durability industry standard to concrete gel material under the sulfate corrosion environment at different environments for use, adopt ordinary portland cement, middle sulphate-resistant cement and high sulphate-resistant cement C respectively 3A content is controlled at respectively below 8%, 5% and 3%, under the high situation of environmental activity grade, and must flyash or the slag powders of admixture more than 20%.Yet the sulphate attack that crystallization causes for salt, C 3A content is not determinative, studies show that in the severe environment of alternation of wetting and drying, and the concrete erosion-resisting characteristics of sulphate-resistant cement is good unlike portland cement concrete.
Under the environment for use condition, because concrete structural surface will suffer frequent drying and watering cycle effect, salts solution will finally produce the salt crystallization and crush bad at the continuous crystallization of inside concrete and rich long-pending at the scene.Therefore, under the frequent environment for use in the higher area of some salt concn, drying and watering cycle, the salt crystalline fracture that concrete suffers is than more serious in the laboratory.In fact, the sulphate attack destruction of concrete many engineerings in actual environment for use is mainly caused by sulphate crystal destruction.
Summary of the invention
The objective of the invention is to propose a kind of disruption inhibiting material of concrete sulphate crystal.
The disruption inhibiting material of concrete sulphate crystal that the present invention proposes is made up of air entrapment agent, water reducer and active admixture, and the weight proportion of its component is:
Weight percentages of components
Water reducer 1.9-98%
Air entrapment agent 0.1-20%
Active admixture 0-98%
Its total amount satisfies 100%.
Wherein, described water reducer is one or more in sulfonated lignin, beta-methylnaphthalene sulfonate polycondensate, melamino-formaldehyde polycondensate or the polycarboxylate dehydragent etc.; Described air entrapment agent is one or more in sodium salt compound, soap compounds, sulfonation hydrocarbon polymer or alkyl-phenmethyl Sulfonates compound of triterpenoid saponin tensio-active agent, rosin tree lipid etc.; Described active admixture is one or more in flyash, slag micropowder, silicon ash or the colliery powder etc.
The preferable set of dispense of the present invention is such as down:
Weight percentages of components
Water reducer 5-98%
Air entrapment agent 0.1-5%
Active admixture 1.9-92%
Its total amount satisfies 100%.
The incorporation of the present invention in concrete is the 1-20% of concrete gel material weight.The present invention's preferable incorporation in concrete is the 1-10% of concrete gel material weight.
Among the present invention, behind the adding air entrapment agent, a large amount of micro-bubbles that can introduce in cement slurry have played the effect of " cushion valve " of volumetric expansion, the volumetric expansion that can effectively reduce and postpone to cause because of sulphate attack in the concrete.Add water reducer in the concrete, can reduce concrete water cement ratio, can remedy the ultimate compression strength loss that the concrete bleed causes.But add the concrete pore structure of active admixture refinement, improve degree of compactness, reduce in the concrete being subject to sulphate attack component C 3The content of A and CH, and improve the structure of slurry in the concrete and the zone of transition of gathering materials.
Among the present invention, water reducer, air entrapment agent should meet the requirement of standard GB 8076-1997 " concrete admixture " to water reducer and air entrapment agent quality.The grade of flyash is I, II level flyash, and the water demand ratio of flyash is less than 105%, and loss on ignition is less than 5%.The specific surface area of breeze is greater than 350m 2/ kg, the loss on ignition of silicon ash is less than 5%, SiO 2Content is greater than 80%.Colliery powder is levigate forming after calcining by self-igniting coal gangue or raw coal spoil, and specific surface area is greater than 300m 2/ kg.
Preparation method of the present invention is as follows:
For powder material, each constituent materials is added in the mixing machine in proportion, stirred 3-5 minute, mix promptly getting required goods.For fluent material, each constituent materials is added in the dispersion machine, stirred 8-12 minute, weighing and bagging promptly gets required goods.
After mixing the present invention in the concrete, the space that the bubble of introducing produces can hold more salt crystal, the expansion that the micro-bubble energy efficient buffer sulphate crystal of promptly introducing causes.The salt crystallization cuts down output that living rate of expansion, the amount of peeling off significantly reduce, the reducing significantly of loss of strength, and concrete sulfate resistance crystalline fracture ability significantly improves.The present invention is to improving concrete weather resistance, and especially to improving western saline and alkaline area and coastal littoral area concrete has very high value work-ing life, this material produce technology is simple, and low price also is easy to apply.
The present invention can effectively suppress the destruction that concrete sulphate crystal causes, to preventing and treating concrete sulphate attack, especially to sulfate concentration is higher and the raising of environment for use (as western saltings, road surface, the littoral area etc.) concrete durability that drying and watering cycle is frequent, have important practical significance.
Embodiment
Further specify the present invention below by embodiment.
Embodiment 1
Condensate of melamine and formaldehyde 73% (weight percent, down together)
Sulfonated lignin 25%
Modified rosin thermopolymer 2%
Total amount 100%
Above-mentioned materials is liquid, and above-mentioned materials is put into dispersion machine, stirs 10 minutes, and weighing and bagging promptly gets desired product.Products obtained therefrom is mixed in the concrete, and its incorporation in concrete is a concrete gel material weight 1%.The air content of concrete mix, rate of expansion, the amount of peeling off, ultimate compression strength loss, folding strength loss performance see Table 1.
Embodiment 2
Flyash 50%
Breeze 35%
Beta-methylnaphthalene sulfonate polycondensate 14.5%
Triterpenoid saponin air entrapment agent 0.5%
Weight 100%
Above-mentioned each constituent materials is added in the mixing machine in proportion, stirred 3-5 minute, mix promptly getting desired product, the pack seal package.Products obtained therefrom is mixed in the concrete, and the incorporation in concrete is 5% of a concrete gel material weight.The air content of concrete mix, rate of expansion, the amount of peeling off, ultimate compression strength loss, folding strength loss performance see Table 1.
Embodiment 3
Flyash 42%
Silicon ash 50%
Beta-methylnaphthalene sulfonate polycondensate 7.7%
Triterpenoid saponin air entrapment agent 0.3%
Weight 100%
Above-mentioned each constituent materials is added in the mixing machine in proportion, stirred 3-5 minute, mix promptly getting desired product, the pack seal package.Products obtained therefrom is mixed in the concrete, and its incorporation in concrete is 10% of a concrete gel material weight.The air content of concrete mix, rate of expansion, the amount of peeling off, ultimate compression strength loss, folding strength loss performance see Table 1.
Embodiment 4
Flyash 62%
Colliery powder 32%
Beta-methylnaphthalene sulfonate polycondensate 4.4%
Sulfonated lignin 1.5%
Sodium lauryl sulphate 0.1%
Total amount 100%
Above-mentioned each constituent materials is added in the mixing machine in proportion, stirred 3-5 minute, mix promptly getting desired product, the pack seal package.Products obtained therefrom is mixed in the concrete, and its incorporation in concrete is that volume is 15% of a concrete gel material weight, and the air content of concrete mix, rate of expansion, the amount of peeling off, ultimate compression strength loss, folding strength loss performance see Table 1.
Concrete performance contrasted before and after table 1. used the present invention
Sample Air content (%) Rate of expansion (* 10 -4) The amount of peeling off (g/m 2) Ultimate compression strength loss (%) Folding strength loss (%)
Benchmark 0.4％ 18.75 3570 75.5 56.0
Embodiment 1 3.5％ 7.34 1728 60.8 35.3
Embodiment 2 6.2％ 3.97 1011 58.3 26.1
Embodiment 3 5.5％ 5.31 1370 61.1 28.6
Embodiment 4 4.0 6.55 1531 62.5 31.8
Air content is meant the air content of concrete mix in the table 1; Rate of expansion, the amount of peeling off, ultimate compression strength loss, folding strength loss are that the maturing test specimen is after normal curing in 28 days, at 10%Na 2SO 4The data that record after 18 drying and watering cycles in the solution, the loss of wherein resistance to compression, folding strength is meant that concrete sample is at Na 2SO 4Intensity in the solution after 18 circulations is supported the rate of loss that test specimen is compared with 28 back marks.Can see that from table 1 concrete is at 10%Na behind use the present invention 2SO 4Rate of expansion, the amount of peeling off in the solution significantly reduce, and ultimate compression strength loss, folding strength loss reduce significantly, and the ability of promptly concrete sulfate resistance crystalline fracture is significantly improved.

Claims (5)

1, a kind of disruption inhibiting material of concrete sulphate crystal is characterized in that being made up of air entrapment agent, water reducer and active admixture, and the weight proportion of its component is:
Weight percentages of components
Water reducer 1.9-98%,
Air entrapment agent 0.1-20%,
Active admixture 0-98%,
Its total amount satisfies 100%;
Wherein, described water reducer is one or more in sulfonated lignin, beta-methylnaphthalene sulfonate polycondensate, melamino-formaldehyde polycondensate or the polycarboxylate dehydragent; Described air entrapment agent is one or more in sodium salt compound, soap compounds, sulfonation hydrocarbon polymer or the alkyl-phenmethyl Sulfonates compound of triterpenoid saponin tensio-active agent, rosin tree lipid; Described active admixture is one or more in flyash, slag micropowder, silicon ash or the colliery powder.
2, disruption inhibiting material of concrete sulphate crystal according to claim 1 is characterized in that being made up of air entrapment agent, water reducer and active admixture, and the weight proportion of its component is:
Weight percentages of components
Water reducer 5-98%
Air entrapment agent 0.1-5%
Active admixture 1.9-92%
Its total amount satisfies 100%.
3, a kind of using method of disruption inhibiting material of concrete sulphate crystal as claimed in claim 1 or 2, it is characterized in that suppressing the incorporation of material in concrete is the 1-20% of concrete gel material weight.
4, the using method of disruption inhibiting material of concrete sulphate crystal according to claim 3, it is characterized in that suppressing the incorporation of material in concrete is the 1-10% of concrete gel material weight.
5, disruption inhibiting material of concrete sulphate crystal according to claim 1 and 2 is characterized in that described flyash grade is I, II level, and the water demand ratio of flyash is less than 105%, and loss on ignition is less than 5%; Described breeze specific surface area is greater than 350m 2/ kg; Described silicon ash loss on ignition is less than 5%, SiO 2Content is greater than 80%; Described colliery powder specific surface area is greater than 300m 2/ kg.
CNB2006100274350A 2006-06-08 2006-06-08 Disruption inhibiting material of concrete sulphate crystal Expired - Fee Related CN100400456C (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101333091B (en) * 2007-06-25 2013-01-02 深圳市海川实业股份有限公司 Method for preparing high-efficiency water-reducing agent of poly-carboxylic acid
CN110015856A (en) * 2019-04-23 2019-07-16 吉林省送变电工程有限公司 A kind of method that aggregate inhibits basic active
CN110877963A (en) * 2019-11-13 2020-03-13 西安理工大学 Method for strengthening recycled coarse aggregate by adopting sulfate dry-wet cycle
CN111018400A (en) * 2019-12-26 2020-04-17 新疆鑫研砼建筑工程有限公司 High performance corrosion inhibitor
CN113816641A (en) * 2021-09-23 2021-12-21 中国铁道科学研究院集团有限公司铁道建筑研究所 Preparation and application of preservative for concrete strut of overhead contact system of electrified railway

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1041712C (en) * 1994-12-14 1999-01-20 华南理工大学 Method for preparing high impervious and anticorrosive concrete with ternary agent

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101333091B (en) * 2007-06-25 2013-01-02 深圳市海川实业股份有限公司 Method for preparing high-efficiency water-reducing agent of poly-carboxylic acid
CN110015856A (en) * 2019-04-23 2019-07-16 吉林省送变电工程有限公司 A kind of method that aggregate inhibits basic active
CN110877963A (en) * 2019-11-13 2020-03-13 西安理工大学 Method for strengthening recycled coarse aggregate by adopting sulfate dry-wet cycle
CN110877963B (en) * 2019-11-13 2021-09-24 西安理工大学 Method for strengthening recycled coarse aggregate by adopting sulfate dry-wet cycle
CN111018400A (en) * 2019-12-26 2020-04-17 新疆鑫研砼建筑工程有限公司 High performance corrosion inhibitor
CN113816641A (en) * 2021-09-23 2021-12-21 中国铁道科学研究院集团有限公司铁道建筑研究所 Preparation and application of preservative for concrete strut of overhead contact system of electrified railway

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