CN110105021A - A kind of portland cement sill of high cracking resistance, super corrosion resistance of chloride ion - Google Patents
A kind of portland cement sill of high cracking resistance, super corrosion resistance of chloride ion Download PDFInfo
- Publication number
- CN110105021A CN110105021A CN201910454737.3A CN201910454737A CN110105021A CN 110105021 A CN110105021 A CN 110105021A CN 201910454737 A CN201910454737 A CN 201910454737A CN 110105021 A CN110105021 A CN 110105021A
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- CN
- China
- Prior art keywords
- chloride ion
- portland cement
- corrosion resistance
- high cracking
- less
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/24—Sea water resistance
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a kind of high cracking resistances, the portland cement sill of super corrosion resistance of chloride ion；It is mainly grouped as by following group as mass fraction: portland cement 25-40%, slag powders 30-40%, low activity cementitious material 15-25%, gypsum 5-9%, nano silica 0.3-2%, polycarboxylate water-reducer 0.4-1.2%, polyethers economization agent 0.3-1.5%, redispersable latex powder 1-4%, metakaolin 2-7%, calcined hydrotalcite 0.5-2%.Portland cement sill cracking resistance of the invention is good, corrosion resistance of chloride ion is very competent, is less than 0.05mm as elliptical ring cracking time is greater than 72 hours and crack width, 3 days compression strength is greater than 28MPa, 28 days compression strength is greater than 60MPa, 28 days flexural strengths are greater than 8MPa, 28 days corrosion resistance of chloride ion coefficients less than 0.5 × 10-12m2/s, 60 days corrosion resistance of chloride ion coefficients are greater than 60% less than 0.35 × 10-12m2/s, chloride ion curing degree.Portland cement sill of the invention is applied to the high field of resisting chloride ion penetration performance requirement.
Description
Technical field
The present invention relates to the silicic acid of cement-based material technical field more particularly to a kind of high cracking resistance, super corrosion resistance of chloride ion
Salt water cement-based material.
Background technique
Marine engineering design service life is increasingly longer, corrodes system to cement-based material chloride diffusion coefficient, resistant to sea water
The requirement of the resistant to sea water erosion performance evaluation indexes such as number, chloride ion curing degree is with raising.Chloride ion passes through in cement-based material
Crackle and hole migrated toward material internal, wherein there is part chloride ion to be solidified by cement-based material, remaining with free chlorine from
Rebar surface enrichment of the sub- form in cement-based material, causes steel bar corrosion when reaching critical concentration, cement-based material loses
Effect is destroyed.
Existing method more reduce cement-based material hole by the incorporation complementary cementitious material of high activity even nano particle
Gap rate or refinement aperture, to inhibit migration of the chloride ion inside cement-based material.The collection of the complementary cementitious material of high activity
Middle aquation is easy to cause cement-based material internal stress to increased dramatically and crack, and the experimental results show the presence meeting of crackle
Chlorine ion binding capacity rate is set to improve one to two orders of magnitude, therefore improve cement-based material anti-crack ability to reduce crackle production
It is raw, and then improve cement-based material corrosion resistance.In addition, rebar surface chloride ion can be delayed by improving chloride ion ability to cure
Concentration reaches the time of critical value, and then improves corrosion resistance of chloride ion ability.
Summary of the invention
The shortcomings that it is an object of the invention to overcome the above-mentioned prior art and deficiency, provide a kind of high cracking resistance, super anti-chlorine from
The portland cement sill that son corrodes.According to gelling material particles research of grade-suit theory, the grain of the reasonably combined cementitious material of the present invention
Degree and activity make the high initial bulk density of cement-based material, hydration process mitigation and continue, to guarantee cement-based material intensity
Develop and have good cracking resistance, then further increases the anti-crack ability of cement-based material by function ingredients and stablize chlorine
Cationic cure ability, final high cracking resistance, the super corrosion resistance of chloride ion ability for realizing cement-based material.
The present invention is using common cementitious material and function ingredients preparation gained, and resistant to sea water erosiveness evaluation index is much
Better than existing national standards (GB/T 31289-2014 " marine worker portland cement ") requirement.
The present invention is achieved through the following technical solutions:
A kind of portland cement sill of high cracking resistance, super corrosion resistance of chloride ion, mainly by it is following as mass fraction
Group is grouped as: portland cement 25-40%, slag powders 30-40%, low activity cementitious material 15-25%, gypsum 5-9%, nanometer
Silica 0.3-2%, polycarboxylate water-reducer 0.4-1.2%, polyethers economization agent 0.3-1.5%, redispersable latex powder 1-
4%, metakaolin 2-7%, calcined hydrotalcite 0.5-2%.
It is greater than 72 hours according to portland cement sill prepared by said components, such as elliptical ring cracking time, and splits
Line width is less than 0.05mm；Compression strength is greater than 28MPa within 3 days；Compression strength is greater than 60MPa within 28 days；Flexural strength is greater than within 28 days
8MPa；Corrosion resistance of chloride ion coefficient is less than 0.5 × 10 within 28 days-12m2/s；Corrosion resistance of chloride ion coefficient is less than 0.35 × 10 within 60 days- 12m2/s；Chloride ion curing degree is greater than 60%.
For granule content of the portland cement partial size greater than 45 μm less than 20%, granule content of the partial size less than 8 μm is small
In 15%.3 days compression strength is greater than 27MPa, 28 days compression strength is greater than 57MPa.
The slag powders are granule content of the partial size greater than 20 μm less than 10%；Granule content of the partial size less than 5 μm is greater than
20%.3 days activity indexs are greater than 95%, 28 day activity index and are greater than 120%.
The low activity cementitious material is that one or both of flyash and agstone mix；Wherein, partial size is greater than
60 μm of granule content is less than 20%, and granule content of the partial size less than 30 μm is less than 20%.Activity index is greater than 80% within 28 days.
The average grain diameter of the nano silica is 150-200 nanometers, and N2 adsorption specific surface area is 200-380m2/g。
It carries out needing for nano silica and mixing water to be pre-mixed when cement-based material molding, and mechanical in ultrasonic environment
Stirring 30 minutes.
The redispersable latex powder is copolymer, the vinyl acetate/versatic acid ethylene copolymer of ethylene/vinyl acetate
One of object, acrylic copolymer are a variety of.
The average grain diameter of the metakaolin is 3-5 μm.Activity index is greater than 95% within 3 days, and activity index is greater than within 28 days
110%.
The calcined hydrotalcite is made under nitrogen protection atmosphere through 450-600 DEG C for calcining 1-2 hours by chemically pure water talcum
, then it is cooled to room temperature and is sealed under nitrogen protection atmosphere.Obtained calcined hydrotalcite average grain diameter is 0.5-3
μm。
The present invention compared with the existing technology, have following advantages and effects
The reasonably combined cementitious material activity of the present invention, makes gained cement-based material have higher initial bulk density and continue
The use of hydration capability, the complementary cementitious material of high additive also avoids the concentration aquation of high-activity gelled material, and then simultaneously
It improves corrosion resistance of chloride ion ability and reduces cracking risk.
By Organic-inorganic composite mode reasonable employment economization agent and redispersable latex powder, by reducing capillary stress
Cracking risk is reduced, while improving cement-based material toughness using redispersable latex powder continuous film forming characteristic and obstructing chloride ion
Migration inside cement-based material, thus realize cement-based material high cracking resistance and super chloride resisting properties.
Dispersion of the nano silica in cement-based material is guaranteed using mode associated with ultrasonic disperse and mechanical stirring
Uniformity, and then formed by heterogeneous nucleation effect acceleration cement-based material micro-structure and develop and improve hydrated product distribution
Even property, to improve cement-based material resistance to deformation and anti-cracking ability.
Reasonable employment chloride ion solidifies function ingredients, and induction cement-based material generates more products containing aluminium and makes full use of
Layered double-hydroxide architectural characteristic provides stronger chemical bonding chloride ion ability by ion exchange, at the same promoted chlorine from
Son solidification stability.
High cracking resistance prepared by the present invention, super corrosion resistance of chloride ion cement-based material chloride diffusion coefficient are much better than existing sea
The requirement of work cement national standard, while there is outstanding anti-cracking ability, to cement-based material durability and ocean engineering knot
The raising of structure service life is of great significance.
Specific embodiment
The present invention is described in further detail below with reference to embodiment, embodiments of the present invention are not limited thereto.
The high cracking resistance of ocean engineering of the invention, super corrosion resistance of chloride ion complex cement sill include using low activity glue
Gel material, portland cement, slag powders, gypsum, metakaolin, calcined hydrotalcite, nano silica, polycarboxylate water-reducer,
Polyethers economization agent and redispersable latex powder；Each component is uniformly mixed by the present invention according to a certain ratio.
Different cementitious materials and functional material granularity requirements, mass fraction shared by activity index and its content are as shown in table 1.
Different component granularity, activity index and mass fraction can fluctuate within the specified scope, it is desirable that the sum of each component mass fraction
It is 100%.
1 different component granularity requirements of table and mass fraction
Remarks: "/" expression is not required this index.
Embodiment 1:
The portland cement sill of the high cracking resistance of ocean engineering in the present embodiment, super corrosion resistance of chloride ion, mainly by powder
Coal ash, slag powders, metakaolin, calcined hydrotalcite, nano silica, gypsum, polycarboxylate water-reducer, gathers portland cement
Ethers economization agent and redispersable latex powder composition；Each component mass content and ocean engineering highly resistance manufactured in the present embodiment
Split, the Portland cement base material properties test of super corrosion resistance of chloride ion it is as shown in table 2.
A kind of high cracking resistance of the ocean engineering of table 2, super corrosion resistance of chloride ion portland cement sill with when performance
Embodiment 2:
The portland cement sill of the high cracking resistance of ocean engineering in the present embodiment, super corrosion resistance of chloride ion, mainly by powder
Coal ash, slag powders, metakaolin, calcined hydrotalcite, nano silica, gypsum, polycarboxylate water-reducer, gathers portland cement
Ethers economization agent and redispersable latex powder composition；Each component mass content and ocean engineering highly resistance manufactured in the present embodiment
Split, the Portland cement base material properties test of super corrosion resistance of chloride ion it is as shown in table 3.
A kind of high cracking resistance of the ocean engineering of table 3, super corrosion resistance of chloride ion portland cement sill with when performance
Embodiment 3:
The portland cement sill of the high cracking resistance of ocean engineering in the present embodiment, super corrosion resistance of chloride ion, mainly by powder
Coal ash, slag powders, metakaolin, calcined hydrotalcite, nano silica, gypsum, polycarboxylate water-reducer, gathers portland cement
Ethers economization agent and redispersable latex powder composition；Each component mass content and ocean engineering highly resistance manufactured in the present embodiment
Split, the Portland cement base material properties test of super corrosion resistance of chloride ion it is as shown in table 4.
A kind of high cracking resistance of the ocean engineering of table 4, super corrosion resistance of chloride ion portland cement sill with when performance
Above-described embodiment is some embodiments of the present invention, but embodiments of the present invention are not by the limit of above-described embodiment
System, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. the portland cement sill of a kind of high cracking resistance, super corrosion resistance of chloride ion, it is characterised in that mainly by pressing quality below
The group of score meter is grouped as:
Portland cement 25-40%, slag powders 30-40%, low activity cementitious material 15-25%, gypsum 5-9%, nano-silica
SiClx 0.3-2%, polycarboxylate water-reducer 0.4-1.2%, polyethers economization agent 0.3-1.5%, redispersable latex powder 1-4%,
Metakaolin 2-7%, calcined hydrotalcite 0.5-2%.
2. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 1, it is characterised in that: institute
Granule content of the portland cement partial size greater than 45 μm is stated less than 20%, granule content of the partial size less than 8 μm is less than 15%.
3. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 2, it is characterised in that: institute
Stating slag powders is granule content of the partial size greater than 20 μm less than 10%；Granule content of the partial size less than 5 μm is greater than 20%.
4. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 3, it is characterised in that: institute
Stating low activity cementitious material is that one or both of flyash and agstone mix；Wherein, partial size is greater than 60 μm of particle
Content is less than 20%, and granule content of the partial size less than 30 μm is less than 20%.
5. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 4, it is characterised in that: institute
The average grain diameter for stating nano silica is 150-200 nanometers, and N2 adsorption specific surface area is 200-380m2/g。
6. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 1, it is characterised in that: institute
It is total to state copolymer, vinyl acetate/versatic acid ethylene copolymer, acrylic acid that redispersable latex powder is ethylene/vinyl acetate
One of polymers is a variety of.
7. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 1, it is characterised in that: institute
The average grain diameter for stating metakaolin is 3-5 μm.
8. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 1, it is characterised in that: institute
It states calcined hydrotalcite and is made within calcining 1-2 hours under nitrogen protection atmosphere through 450-600 DEG C by chemically pure water talcum, then in nitrogen
It is cooled to room temperature and is sealed under gas shielded atmosphere.
9. according to the portland cement sill of high cracking resistance, super corrosion resistance of chloride ion described in claim 8, it is characterised in that: institute
Calcined hydrotalcite average grain diameter obtained is 0.5-3 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910454737.3A CN110105021A (en) | 2019-05-29 | 2019-05-29 | A kind of portland cement sill of high cracking resistance, super corrosion resistance of chloride ion |
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|---|---|---|---|
| CN201910454737.3A CN110105021A (en) | 2019-05-29 | 2019-05-29 | A kind of portland cement sill of high cracking resistance, super corrosion resistance of chloride ion |
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Cited By (6)
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|---|---|---|---|---|
| CN112624720A (en) * | 2020-12-31 | 2021-04-09 | 广州建设工程质量安全检测中心有限公司 | High-chlorine ion corrosion resistance auxiliary cementing material and preparation method thereof |
| CN113356394A (en) * | 2021-05-17 | 2021-09-07 | 林培炎 | Anti-corrosion precast concrete wallboard |
| CN113582650A (en) * | 2021-08-05 | 2021-11-02 | 上海市建筑科学研究院有限公司 | Rapid-hardening high-corrosion-resistance mortar repair material for sewage concrete structure |
| CN113754378A (en) * | 2021-09-17 | 2021-12-07 | 中山市灵湾新材料科技有限公司 | Concrete with high resistance to chloride ion corrosion and preparation method thereof |
| CN114105564A (en) * | 2021-12-06 | 2022-03-01 | 桂林理工大学 | High-corrosion-resistance low-shrinkage concrete and preparation method thereof |
| CN115924945A (en) * | 2022-11-18 | 2023-04-07 | 上海百奥恒新材料有限公司 | Calcined hydrotalcite and preparation method thereof, composition for preparing high-durability marine concrete, concrete and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112624720A (en) * | 2020-12-31 | 2021-04-09 | 广州建设工程质量安全检测中心有限公司 | High-chlorine ion corrosion resistance auxiliary cementing material and preparation method thereof |
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| CN113582650A (en) * | 2021-08-05 | 2021-11-02 | 上海市建筑科学研究院有限公司 | Rapid-hardening high-corrosion-resistance mortar repair material for sewage concrete structure |
| CN113754378A (en) * | 2021-09-17 | 2021-12-07 | 中山市灵湾新材料科技有限公司 | Concrete with high resistance to chloride ion corrosion and preparation method thereof |
| CN114105564A (en) * | 2021-12-06 | 2022-03-01 | 桂林理工大学 | High-corrosion-resistance low-shrinkage concrete and preparation method thereof |
| CN114105564B (en) * | 2021-12-06 | 2022-11-11 | 桂林理工大学 | High-corrosion-resistance low-shrinkage concrete and preparation method thereof |
| CN115924945A (en) * | 2022-11-18 | 2023-04-07 | 上海百奥恒新材料有限公司 | Calcined hydrotalcite and preparation method thereof, composition for preparing high-durability marine concrete, concrete and preparation method thereof |
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Application publication date: 20190809 |