CN102092970B - Special admixture for maritime work - Google Patents
Special admixture for maritime work Download PDFInfo
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- CN102092970B CN102092970B CN201010612917A CN201010612917A CN102092970B CN 102092970 B CN102092970 B CN 102092970B CN 201010612917 A CN201010612917 A CN 201010612917A CN 201010612917 A CN201010612917 A CN 201010612917A CN 102092970 B CN102092970 B CN 102092970B
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- concrete
- admixture
- slag powder
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- doping
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the field of concretes, in particular relating to a special admixture for maritime work. The technical scheme in the invention is as follows: the admixture is prepared from ultrafine high-activity slag powder serving as a raw material and an excitant in a certain proportion, wherein the admixture comprises the following components in parts by weight: 94-98 parts of slag powder with a specific surface area of 800-1200 m<2>/kg and 2-6 parts of excitant. As the admixture is prepared by doping single common slag powder or admixing slag powder, fly ash and silicon ash, themechanical property of the admixture is worse than that of the concrete obtained by doping the ultrafine high-activity slag powder, and the durability of the concrete is greatly improved. Under the condition of low doping amount (accounting for about 10% of the total gel material amount), the early strength of the concrete is strengthened, the work property of the concrete is improved, the anti-permeability and freezing resistance of the concrete are obviously improved, and simultaneously the production cost is greatly lowered.
Description
Technical field
The invention belongs to concrete field, be specifically related to a kind of maritime works's admixture specially.
Background technology
Ocean environment is complicated and changeable, the effect of multiple natural factor such as that concrete use in ocean environment can be subjected to is freezing, stormy waves, water quality, morning and evening tides and shorten its working life.General concrete working life is in 50 ~ 100 years, but maritime concrete be in all concrete working life the shortest, what have only just needed repairing in several years.Be not only that destructions such as subbottom tunnel, dam are bigger, China's coastal installation and harbour engineering, water conservancy project structures also mostly have destruction in various degree.It is thus clear that pay attention to the weather resistance of maritime concrete, significant for the many large-scale harbours of China, hydro project, large bridge etc.Vitriol in the seawater is to expand to the characteristic of concrete corrosion, and finally causes cracking or top layer to be softened; It is to make rebar passivation film destroy corrosion that cl ions corrodes; Freezing behavior is to reduce to when below freezing in temperature, and the concrete that continues to be in the water saturation state destroys.These all relate to concrete impermeability and frost resistance problem.When solving concrete endurance issues, mainly analyze and research from the mineral admixture angle.
At present, silicon ash, GBFS and flyash are the most frequently used mineral admixtures of preparation maritime works's high performance concrete.The price of silicon ash is comparatively expensive and have shortcomings such as concrete shrinkage is big, uses on a large scale to be restricted; Flyash exist early activity low with quality fluctuation property weakness such as big and less stable; Slag is that cement industry uses maximum active additions; Approved by masses always and use on a large scale recent years; But single admixture effect does not have so good that everybody imagines, comes place of cement so all pay attention to polycomponent blended mode in the present engineering, and also there are problems in simple mixing; Concrete coagulating time is long, early strength descends significantly, and silicon ash concrete causes problems such as shrinkage crack.
Document Investigation in the past got adopted the preparation in advance by a certain percentage of flyash, slag micropowder, silicon ash in " admixture specially for high-performance marine concrete "; And with auxiliary agent pass through according to a certain ratio mix grinding technology formulated a kind of maritime works's adulterant, but numerous, the complex process of this method raw material.
In order to satisfy the development need of technology of high performance concrete and ocean environment corrosion resistant concrete technology, develop a kind of maritime works's admixture specially, both can improve concrete early strength, can improve concrete weather resistance again.
Summary of the invention
The objective of the invention is, to the deficiency of prior art, and a kind of maritime works's admixture specially is provided, by the adulterant that ultrafine slag powder and exciting agent are formed, high reactivity, high-durability can obviously improve concrete impermeability and frost resistance.
For solving the problems of the technologies described above, technical scheme of the present invention is: maritime works's admixture specially comprises following component by ratio of weight and the number of copies: 94-98 parts of ultrafine slag powders, 2-6 parts of exciting agents.
Exciting agent of the present invention is the mixture of vitriol and carbonate.
The weight ratio of vitriol of the present invention and carbonate is 1:1.
The specific surface area of ultra-fine ore deposit of the present invention quarrel powder is 800～1200m
2/ kg, median size is smaller or equal to 4 μ m.
The hydration characteristics of ultrafine slag powder: the maritime works's high performance concrete that mixes ultrafine slag powder exists significantly different with the hydration reaction of normal concrete; The vitreum content of ultrafine slag powder is generally up to more than 80%; Have higher hydraulically active, slag powders reaction independent and water is very slow, still; In joining Portland clinker, mineral C in the cement clinker
3The very fast and water reaction of S; Separate out calcium hydroxide when generating hydrated silicate; Because ultrafine slag powder constantly consumes the calcium hydroxide of separating out in the silicate cement hydration; Generate materials such as hydrated calcium silicate, drated calcium aluminate and calcium rock stone and be filled in the hole of cement stone, reduced the weak link of the calcium hydroxide in the cement stone, thereby concrete resistance of chloride ion penetration can constantly be strengthened.
The present invention selects vitriol and carbonate compound activator for use, through the alkali content in the suitable raising system, can make silicon-oxy tetrahedron generation depolymerization, thus fast reaction speed.Sodium sulfate and Quilonum Retard in the ratio of 1:1 composite after, it is best that its weight percent accounts for the 2-6% effect of adulterant.
Preparing method of the present invention is: take by weighing above-mentioned raw materials by ratio of weight and the number of copies respectively, at first sodium sulfate and the Quilonum Retard ratio in 1:1 is mixed with stirrer, slowly joining specific surface area with solid-state form is 800-1200m
2In the ultrafine slag powder of/kg, mix with stirrer, homogenizing is carried out service checks such as main ingredient, water requirement after storing, and packing promptly obtains maritime works's admixture specially proposed by the invention then.
The invention has the beneficial effects as follows: maritime works's admixture specially is 800-1200m by specific surface area
2The adulterant that the ultrafine slag powder of/kg and exciting agent are formed; High reactivity, high-durability; Can under the situation of low-dosage (account for greatly binder total amount 20%), improve concrete early strength, improve concrete serviceability; Obviously improve concrete impermeability and frost resistance, can reduce production costs greatly simultaneously.
Following table 1 is contain 94 parts of ultrafine slag powders, maritime works's adulterant of 6 parts of exciting agents and the contrast of existing adulterant of the present invention:
Following table 2 contains the mensuration result of performance index of maritime works's adulterant of 94 parts of ultrafine slag powders, 6 parts of exciting agents for the present invention:
Embodiment
The slag powders of Chemical Composition is that example explains further details to the present invention in the following table 3:
Following table 4 is the component of five embodiment maritime works's admixture speciallies of the present invention:
Following table 5 is the effect synopsis of above-mentioned five embodiment in concrete:
The effect synopsis of the special-purpose Additive of table 5 maritime works of the present invention
Annotate: used cement is scenery with hills and waters 52.5R silicate cement.
Test result analysis: the adding of adulterant; Concrete early stage and later stage ultimate compression strength all has raising in various degree, and the exciting agent volume is between 2-6% the time, and exciting agent admixture ratio is big more in the adulterant; Concrete crushing strength is big more; But volume surpasses after 6%, and volume is high more, and intensity descends on the contrary.
Following table 6 is for mixing the endurance performance of concrete contrast of embodiments of the invention 1,2,3 adulterants:
Table 6 durability of concrete
Claims (2)
1. maritime works's admixture specially; It is characterized in that: comprise following component by ratio of weight and the number of copies: 94-98 parts of ultrafine slag powders, 2-6 parts of exciting agents; Described exciting agent is the mixture of vitriol and carbonate; Described vitriol and carbonate weight ratio are 1:1, and the median size of described ultrafine slag powder is smaller or equal to 4 μ m.
2. maritime works's admixture specially according to claim 1 is characterized in that: the specific surface area of described ultrafine slag powder is 800～1200m
2/ kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010612917A CN102092970B (en) | 2010-12-30 | 2010-12-30 | Special admixture for maritime work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010612917A CN102092970B (en) | 2010-12-30 | 2010-12-30 | Special admixture for maritime work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102092970A CN102092970A (en) | 2011-06-15 |
| CN102092970B true CN102092970B (en) | 2012-10-10 |
Family
ID=44126258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010612917A Expired - Fee Related CN102092970B (en) | 2010-12-30 | 2010-12-30 | Special admixture for maritime work |
Country Status (1)
| Country | Link |
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| CN (1) | CN102092970B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381851A (en) * | 2011-07-29 | 2012-03-21 | 济南鲁新新型建材有限公司 | Special admixture for tunnel concrete |
| CN102765896B (en) * | 2012-07-30 | 2014-01-29 | 济南鲁新新型建材有限公司 | Mineral admixture for autoclave-free and steaming-free prestressed pipe piles and manufacturing method of mineral admixture |
| CN106431036B (en) * | 2016-09-13 | 2019-06-04 | 东莞市润阳联合智造有限公司 | Marine worker portland cement and preparation method thereof |
| CN110698102A (en) * | 2019-10-31 | 2020-01-17 | 上海宝田新型建材有限公司 | Marine admixture |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343161A (en) * | 2008-08-15 | 2009-01-14 | 同济大学 | Cement-slag powder gel system with desulfurized gypsum as excitant |
| CN101792296A (en) * | 2010-02-04 | 2010-08-04 | 同济大学 | Concrete erosion-resistant agent based on ultrafine slag powder and use method thereof |
-
2010
- 2010-12-30 CN CN201010612917A patent/CN102092970B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343161A (en) * | 2008-08-15 | 2009-01-14 | 同济大学 | Cement-slag powder gel system with desulfurized gypsum as excitant |
| CN101792296A (en) * | 2010-02-04 | 2010-08-04 | 同济大学 | Concrete erosion-resistant agent based on ultrafine slag powder and use method thereof |
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| Publication number | Publication date |
|---|---|
| CN102092970A (en) | 2011-06-15 |
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Granted publication date: 20121010 Termination date: 20171230 |
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