CN101289304B

CN101289304B - Strengthening material for concrete antiabrasion layer of ocean engineering and production method thereof

Info

Publication number: CN101289304B
Application number: CN2008101068684A
Authority: CN
Inventors: 王信刚; 胡明玉; 宋固全; 李细保; 赵世忠
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2008-05-20
Filing date: 2008-05-20
Publication date: 2012-11-07
Anticipated expiration: 2028-05-20
Also published as: CN101289304A

Abstract

一种海洋工程混凝土保护层强化材料及其生产方法，由胶凝组分(包括水泥、矿物掺合料、改性剂)、骨架组分(特细砂)和性能调整组分(包括裂纹细微化组分、微裂纹自愈合组分)，按一定的配比经过混磨工艺配制而成。在海洋工程混凝土保护层的施工现场，采用预先生产的海洋工程混凝土保护层强化材料来制备海洋工程混凝土保护层，可以简化混凝土施工工序，便于质量控制。本发明应用于海洋工程混凝土保护层，可以有效提高海洋工程混凝土的耐久性，尤其是其抗氯离子渗透性能。A marine engineering concrete protective layer reinforcement material and a production method thereof, comprising a cementitious component (including cement, mineral admixtures, modifiers), a skeleton component (extra fine sand) and a performance adjustment component (including crack fine Chemical components, micro-crack self-healing components) are prepared through a mixed grinding process according to a certain ratio. At the construction site of the marine engineering concrete protective layer, the pre-produced marine engineering concrete protective layer strengthening material is used to prepare the marine engineering concrete protective layer, which can simplify the concrete construction process and facilitate quality control. The invention is applied to the marine engineering concrete protective layer, and can effectively improve the durability of the marine engineering concrete, especially its anti-chloride ion penetration performance.

Description

Strengthen material for concrete antiabrasion layer of ocean engineering and working method thereof

Technical field

The invention belongs to the material of construction class, be specifically related to a kind of strengthen material for concrete antiabrasion layer of ocean engineering and working method thereof.

Background technology

The problem that cl ions erosion initiation steel bar corrosion causes the ocean engineering concrete structure durability to descend under the ocean environment is one of urgent problem that solves of current engineering circle needs, also is one of present concrete material hot research fields.The U.S. since the 1950's just the research of reinforcement corrosion under the bar in chlorine salt solution, 20th century the mid-80 implemented " SHRP " in China to highway engineering specially, the reinforcement corrosion problem of research highway bridge; Britain starts " ocean research plan " the seventies in 20th century, studies to the corrosion of Steel Concrete in the ocean environment; At present the seriousness of reinforcement corrosion has also had relatively clear-headedly and has been familiar with under China's engineering bound pair cl ions erosion environment; Chinese Academy of Engineering's building, water conservancy and the construction work department of the Chinese Academy of Sciences are in calendar year 2001; Held the engineering science and technology forum or the academic discussion of five relevant concrete structure engineering securities and weather resistance present situation problem and countermeasure continuously, the harm that reinforcement corrosion causes for country and society under the call to attention cl ions erosion environment energetically.

To corrosive medium under the ocean environment particularly cl ions Steel Concrete is caused the situation of heavy corrosion; The related scientific research achievement shows with long-term engineering practice investigation under the current comparatively sophisticated raising ocean environment there be the main technical schemes of Steel Concrete weather resistance both at home and abroad: adopt maritime works's high performance concrete, improve thickness of concrete cover and quality; The gunning concrete supercoat; Use corrosion-resistant steel bar, admixture reinforcing bar rust inhibitor is taked electro-chemical protection etc.Wherein maritime works's high performance concrete is owing to have excellent weather resistance and cost performance has received the approval in concrete material field and civil engineering field in the world; In recent years; Also carried out a large amount of research both at home and abroad around maritime works's high performance concrete; But most research is still merely from the concrete material angle; As be that employing high-quality mineral admixture and new and effective water reducer are compound basically, be equipped with the cement and the good coarse-fine aggregate of grating that adapt with it, form low water binder ratio, low defective, high compact, high competent maritime works's high performance concrete.It is guidance that ZL 02137419.8 " admixture specially for high-performance marine concrete and working method thereof " has set forth a kind of theory with the mutual synergistic effect of polynary gelling material; With mixing raw material with suitable proportioning outside industry such as slag micropowder, flyash, the silicon ash activity, be mixed with admixture specially for high-performance marine concrete through mix grinding.In maritime concrete, mix this admixture specially, can improve concrete workability, weather resistance, especially its resisting corrosion of chlorine ion performance.ZL 00116326.5 " technology of preparing of high-activity concrete additive and method " has set forth and a kind ofly has been made up of slag, slag, crystal seed, surface-modifying agent and exciting agent, the high-activity concrete additive that makes down through the levigate activation of physics, chemi-excitation acting in conjunction.In concrete, mix this adulterant, can improve concrete workability, reduce hydration heat, improve the sulphate-corrosion resistance ability.

In fact; The primary influence factor of Steel Concrete weather resistance is cl ions " erosion " speed in concrete in the seawater under the ocean environment, and cl ions " erosion " speed in concrete depends primarily on concrete cover opposing corrosive medium (like Cl ^-, SO ₄ ^2-, Mg ²⁺Deng) ability of invading; The ability that concrete opposing corrosive medium is invaded can characterize through its ion transmission performance; This shows that the ion transmission performance of Steel Concrete weather resistance and its ion transmission performance, particularly its resist is closely related under the ocean environment.Concrete cover is to stop Environmental Water and various corrosive medium to the first line of defence that inside concrete moves, and also is main defence line.Therefore; The key that improves Steel Concrete weather resistance under the ocean environment is to improve the concrete cover quality; Improve the ion transmission performance of concrete ion transmission performance, particularly its resist, thereby realize effectively improving the purpose of ocean engineering concrete weather resistance.

In the oceanographic engineering of in the past using maritime works's high performance concrete; Be in oceanographic engineering, integrally to utilize maritime works's high performance concrete to reach the purpose that improves the ocean engineering concrete weather resistance more, seldom consider to adopt special high performance cement-based material to prepare the ocean engineering concrete resist.

Summary of the invention

The object of the present invention is to provide a kind of strengthen material for concrete antiabrasion layer of ocean engineering,, improve the ion transmission performance of concrete cover, thereby realize effectively improving the purpose of ocean engineering concrete weather resistance to improve the concrete cover quality.

Another object of the present invention is to provide the working method of strengthen material for concrete antiabrasion layer of ocean engineering.

The present invention is based on the compoundization thinking of cement-based material; Ooze theoretical and interfacial transition zone enhanced mechanism according to exceeding; Refinement cement-based material interfacial transition zone; The path is oozed in exceeding that minimizing forms because of interfacial transition zone connects each other, thereby improves the ion transmission performance of cement-based material greatly, supports for the ocean engineering concrete resist provides critical material.

For realizing above-mentioned purpose, strengthen material for concrete antiabrasion layer of ocean engineering of the present invention is to adopt bonding component, skeleton component and performance adjustment component, and is formulated through mix grinding technology by certain proportioning.

Strengthen material for concrete antiabrasion layer of ocean engineering of the present invention comprises following component and content:

Component concentration (quality %)

Bonding component 40-50%

Skeleton component 50-60%

Performance adjustment component 0.5-1.5%

Described bonding component comprises cement, mineral admixture, properties-correcting agent, and its mass percent that respectively accounts for bonding component is: cement 45-65%, mineral admixture 35-55%, properties-correcting agent 1-3%.Wherein cement is silicate cement or the ordinary Portland cement of strength grade>=52.5MPa; Mineral admixture comprises that specific surface area is 400-450m ²The slag micropowder of/kg, specific surface area are 350-400m ²The flyash of/kg, specific surface area are 18000-22000m ²The silica flour of/kg, its mass percent that respectively accounts for mineral admixture is: slag micropowder 40-50%, flyash 30-40%, silica flour 20-30%; Properties-correcting agent comprises grinding aid (in trolamine, methyl alcohol, terepthaloyl moietie or the calcium lignin sulphonate a kind of), exciting agent (in sulphate activation agent or the alkali-activator a kind of), tensio-active agent (in polycarboxylate, naphthalenesulfonate or the sulfamate a kind of), and its mass percent that respectively accounts for properties-correcting agent is: grinding aid 0.2-2.0%, exciting agent 45-55%, tensio-active agent 40-50%.

Described skeleton component is that particle diameter is that 115-380 μ m and fineness modulus are the special fine quartz sand of 1.10-1.50.

Described performance adjustment component comprises crackle granular component, tiny crack self-healing component, and its mass percent that respectively accounts for performance adjustment component is: crackle granular component 10-20%, tiny crack self-healing component 80-90%.Wherein crackle granular component is the miscellaneous polypropylene fibre, by staple fibre (length is 1-3mm) and macrofiber (length is 9-19mm) by mass ratio 1: 1-1: 3 form; Tiny crack self-healing component is the powdered cementitious capillary waterproofing material.

Mineral admixtures such as slag micropowder, flyash, silica flour play auxiliary gelling, fill densification, can fill and stop up hole, reduce porosity, and pore structure and interfacial transition zone are improved in the refinement aperture, improve degree of compactness; Properties-correcting agent works to excite composition activity, improves processing characteristics; Framework material adopts special fine quartz sand, works to make up main body framework, restriction contraction, refinement interfacial transition zone; Crackle granular component plays the granular crackle, improves the effect of crack resistance; Tiny crack self-healing component works the crack self-healing ability that strengthens, and stops up the effect of infiltrating passage.

Because the component of strengthen material for concrete antiabrasion layer of ocean engineering is more; For reducing the error in dipping in its preparation process; Strengthen its quality control, before preparation ocean engineering concrete resist, should produce strengthen material for concrete antiabrasion layer of ocean engineering in advance; So that in the working-yard of ocean engineering concrete resist, only need mix stirring to the strengthen material for concrete antiabrasion layer of ocean engineering of producing in advance by a certain percentage with water, aqua admixture and get final product.So both simplify the situ production operation of strengthen material for concrete antiabrasion layer of ocean engineering, also helped strengthening simultaneously the quality control of ocean engineering concrete resist.

The working method of strengthen material for concrete antiabrasion layer of ocean engineering of the present invention: earlier properties-correcting agent and slag micropowder, flyash, cement were carried out one time mix grinding 10-20 minute by above-mentioned prescription, until mix grinding material Blain specific surface>=450m ²/ kg adds silica flour, tiny crack self-healing component was carried out the secondary mix grinding 5-10 minute then, then evenly adds crackle granular component and carries out three times mix grinding 5-10 minute, until the Blain specific surface>=650m of mix grinding material ²/ kg adds the skeleton component at last and carried out four times mix grinding 5-10 minute.

Advantage of the present invention is: be applied to the ocean engineering concrete resist, can effectively improve the weather resistance of ocean engineering concrete, especially its resistance of chloride ion penetration ability.

Embodiment

Below in conjunction with embodiment the present invention is described further, but embodiment should not regard the restriction to right of the present invention as.

The production of embodiment 1 strengthen material for concrete antiabrasion layer of ocean engineering

Earlier with mix grinding in slag micropowder 1800kg, flyash 1420kg, PII 52.5 cement 5600kg and trolamine 7kg, sodium sulfate 71kg, the naphthalenesulfonate 69kg adding grinding machine 15 minutes; Mill speed is 18 rev/mins; Added silica flour 980kg, cementitious capillary waterproofing material (the THINKABLE water-proof material that gram water-proof material ltd produces is oozed in Shanghai) 117.6kg continuation mix grinding then 8 minutes; Each 9.1kg of polypropylene fibre that then even adding length is 3mm and 10mm continued mix grinding 8 minutes, until the Blain specific surface>=650m of mix grinding material ²/ kg adds special fine sand 11760kg at last and continued mix grinding 8 minutes.Discharging gets strengthen material for concrete antiabrasion layer of ocean engineering 21.5t.Its performance test data is seen table 1.

Table 1

Density (g/cm ³)	Specific surface area (m ²/kg)	Alkali content (%)	Chloride ion content (%)	Sulfur trioxide content (%)
							0.08	0.01	3.4

The practical applications of embodiment 2 strengthen material for concrete antiabrasion layer of ocean engineering

The strengthen material for concrete antiabrasion layer of ocean engineering of embodiment 1 production is used for the prefabricated cast of ocean engineering concrete resist.For the various performances of strengthen material for concrete antiabrasion layer of ocean engineering are described, embodiment has designed one group of C50 maritime works's high performance concrete appearance as a comparison.(numbering: MECS) (numbering: proportioning MHPC) is seen table 2 to the strengthen material for concrete antiabrasion layer of ocean engineering of producing, and its performance test data is seen table 3 with C50 maritime works's high performance concrete.

Table 2

Numbering	Strengthening material	Cement	Slag micropowder	Silica flour	River sand	Stone	Economization agent	High efficiency water reducing agent	Water
										MECS	2317	-	-	-	-	-	12	20	216
MHPC	-	353	94	24	660	1123	-	7	141

Annotate: the water-cement ratio of MECS is 0.22; The water-cement ratio of MHPC is 0.30, adopts PO 42.5 cement; Economization agent is the Tatzaguard AS20 antishrinking agent (aqua) of the special company of Shanghai Mace; High efficiency water reducing agent is the high dense type naphthalene series high-efficiency water-reducing agent (aqua) of Mighty-150 that the chemical ltd of last seaflower king produces.

Table 3

Test-results shows: the divergence of MECS is 145mm, the requirement of divergence 120-160mm in the time of can satisfying the prefabricated components cast, and the slump of MHPC is 50mm, the requirement of divergence 40-60mm in the time of also can satisfying the precast concrete cast; The ultimate compression strength of MECS and MHPC all satisfies the concrete requirement of C50.

MECS all is greater than MHPC in the shrinkage value in each length of time, should be unfavorable for the control of resist shrinkage cracking, yet; Can find after adopting the crack width gauge to observe the crack of prefabricated components resist outside surface; It is even to adopt MECS to prepare on the outside surface of resist Fiber Distribution, and fracture width is between 0.02-0.08mm, and the tiny crack of fracture width＜0.1mm is an acceptable; The contraction of MECS is big does not still ftracture; Mainly be that simultaneously, the high-activity mineral blending material that mixes has also played certain function owing to added crackle granular component and tiny crack self-healing component in the strengthen material for concrete antiabrasion layer of ocean engineering.

Adopt the MECS of NEL method test and the chloride diffusion coefficient of MHPC to be respectively 0.56 * 10 ^-13m ²/ s and 12.75 * 10 ^-13m ²/ s, the chloride diffusion coefficient of MECS is than the low one magnitude of MHPC; Adopt the MECS of coulometry test to be respectively 96 coulombs and 459 coulombs with 6 hours electric conduction quantities of MHPC, 6 hours electric conduction quantities of MECS are also than the one magnitude of hanging down of MHPC.It is thus clear that, what the resistance of chloride ion penetration of MECS can be far above MHPC, adopt MECS to prepare the weather resistance that the ocean engineering concrete resist can effectively improve ocean engineering concrete.

Claims

1. A marine engineering concrete protective layer strengthening material is characterized in that it comprises the following components in mass percentage: 40-50% of the gelling component, 50-60% of the skeleton component, 0.5-1.5% of the performance adjustment component, The sum of the above components is 100%;

The gelling components include cement, mineral admixtures, modifiers, and their respective mass percentages in the gelling components are: 45-65% of cement, 35-55% of mineral admixtures, modifier 1 ~3%, the sum of the above components is 100%; modifiers include grinding aids, activators, and surfactants, and their respective mass percentages in modifiers are: grinding aids 0.2-2.0%, activators 45% ～55%, surfactant 40～50%, the sum of the above components is 100%; the grinding aid is one of triethanolamine, methanol, ethylene glycol or calcium lignosulfonate; the activator is sulfate excitation A kind of in agent or alkali activator; Surfactant is a kind of in polycarboxylate, naphthalene sulfonate or sulfamate;

The performance adjustment component includes a crack miniaturization component and a microcrack self-healing component, each of which accounts for the mass percentage of the performance adjustment component: 10% to 20% of the crack miniaturization component, and 80-90%; the micro-crack component is mixed polypropylene fiber, which is composed of short fibers with a length of 1-3 mm and long fibers with a length of 9-19 mm in a mass ratio of 1:1-1:3; micro-cracks self-healing The combined component is a powdery cement-based permeable crystalline waterproof material;

The skeleton component is ultra-fine quartz sand with a particle size of 115-380 μm and a fineness modulus of 1.10-1.50.

2. The marine engineering concrete protective layer reinforcement material according to claim 1, characterized in that said cement is Portland cement with a strength grade ≥ 52.5 MPa.

3. The marine engineering concrete protective layer reinforcement material according to claim 1, characterized in that the mineral admixture includes slag fine powder with a specific surface area of 400-450m ² /kg, and a specific surface area of 350-400m ² /kg fly ash and silicon powder with a specific surface area of 18,000-22,000m ² /kg, and their respective mass percentages in mineral admixtures are: 40-50% of slag fine powder, 30-40% of fly ash, and 20-30% of silicon powder %, the sum of the above components is 100%.

4. A production method of the marine engineering concrete protective layer reinforcing material as claimed in claim 3, characterized in that the modifying agent, slag micropowder, fly ash, and cement are first mixed and ground for 10 to 20 minutes until the mixed abrasive Blaine specific surface area ≥ 450m ² /kg, then add silicon powder and micro-crack self-healing components for 5 to 10 minutes of mixed grinding for the second time, then evenly add crack miniaturization components for 3 times of mixed grinding for 5 to 10 minutes, until The Blaine specific surface area of the mixed grinding material is ≥650m ² /kg, and finally the skeleton component is added for four times of mixed grinding for 5-10 minutes.