CN103073212B - Mineral admixture for self-healing of cement-based material crack and preparation method and application of mineral admixture - Google Patents
Mineral admixture for self-healing of cement-based material crack and preparation method and application of mineral admixture Download PDFInfo
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- CN103073212B CN103073212B CN201310031979.4A CN201310031979A CN103073212B CN 103073212 B CN103073212 B CN 103073212B CN 201310031979 A CN201310031979 A CN 201310031979A CN 103073212 B CN103073212 B CN 103073212B
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Abstract
The invention relates to a mineral admixture for self-healing of a cement-based material crack. The mineral admixture comprises the following components by weight percentage: 20-55% of silica-based mineral, 10-30% of silicate mineral, 30-60% of expansion mineral and 5-30% of crystal mineral. A preparation method comprises the steps of weighing the raw components, adding the weighed components into a stirrer, stirring for 3-10min until the components are mixed uniformly, and obtaining the mineral admixture. The mineral admixture is added into a cement-based material; when the cement-based material generates a crack, the mineral admixture generates an insoluble deposit in the cement-based material crack to fill and seal the cement-based material crack; and the self-healing of the cement-based material crack is realized.
Description
Technical field
The present invention relates to a kind of mineral additive for Crack Self-healing in Cementitious Materials and preparation method thereof and application, belong to building material field.
Background technology
Cement-based material, if mortar, concrete etc. are because of the large weakness of its fragility, under external loads or environmental activity, concrete structure in use often ftractures, and produces crack in various degree.Many research has also proposed many distress in concrete restorative procedures under all kinds of envrionment conditionss that are applicable to; as methods such as reinforcing and repairing, anchoring, bonding, cast and galvanic protections, these crack restorative procedures play an important role to the weather resistance that improves concrete structure.But still there is significant limitation to the reparation of concrete structure crack in water surrounding in these methods.Traditional method for repairing and mending is very uneconomic, in many cases or even invalid.These methods are mainly passive restorative procedures of later stage.Compared with the restorative procedure traditional with these, in recent years, many some distress in concrete self-repair methods of researching and proposing, it refers to that concrete in use can carry out initiatively the damage crack of its generation, automatically diagnosis, and realize the novel method of crack self-healing, it is one of important channel of improving overall performance, safe reliability and the weather resistance of concrete material structure.
At present, proposed many cement-based material self-repair methods, these methods have important practical significance to realizing cement-based material crack selfreparing.These methods comprise fusing reparation, shape memory alloy selfreparing and the matrix material sensor selfreparing method etc. of the reparation of microcapsule intelligence, fiberglass pipe reparation, thermoplastic tube.But the novel method of these active selfreparings still cannot solve at present the selfreparing medium of introducing and the consistency of concrete substrate is poor, cause the difficult problems such as basal body structure degradation.Therefore, research and develop novel cement-based material crack self-repair method and there is important practical significance and using value.
Summary of the invention
The object of the invention is to for problems of the prior art, a kind of mineral self-healing novel method of cement-based material crack is provided, in cement-based material, add a kind of specialty minerals admixture, in the time that cement-based material produces crack (being less than 0.4 millimeter), under certain environment inductive condition, it generates insoluble settling in cement-based material crack, fill, seal cement-based material crack, realize the self-healing of cement-based material crack.
The present invention is achieved by the following technical solutions:
For a mineral additive for Crack Self-healing in Cementitious Materials, comprise the component of following weight percent:
Silica-based mineral constituent 20-55%;
Silicate minerals component 10-30%;
Expansion mineral constituent 30-60%;
Crystalline mineral component 5-30%.
Preferably, described a kind of mineral additive for Crack Self-healing in Cementitious Materials comprises the component of following weight percent:
Silica-based mineral constituent 30-50%;
Silicate minerals component 10-20%;
Expansion mineral constituent 30-50%;
Crystalline mineral component 10-20%.
Preferably, in described silica-based mineral constituent, silica content is greater than 60wt%, alumina content is greater than 10wt%, and calcium oxide content is greater than 10wt%.
Preferably, described silica-based mineral constituent is composite and obtain by silicon ash and flyash.
Described silica-based mineral constituent can promote that hydrated cement does not continue aquation and reacts with hydrated product Ca (OH) 2 and produce gel.
Preferably, described silicate minerals component is layer silicate mineral, and interlayer contains tradable positively charged ion, has ion-exchange capacity; Be preferably sodium bentonite, calcium-base bentonite or polynite etc.
Preferably, in described expansion mineral constituent chemical composition, silica content is that 25-35wt%, alumina content are 10-20wt%, and calcium oxide content is that 15-25wt%, sulfur trioxide content are 25-35wt%; And production swelling property material is reacted in described expansion mineral constituent with cement minerals and hydrated product.
Preferably, described expansion mineral component can be for obtaining by silico-aluminate, aluminum oxide and calcium sulfate are composite; Described silico-aluminate is ca aluminosilicate.
Further preferred, described expansion mineral constituent is selected from UEA-H swelling agent.
Preferably, in described crystalline mineral component, contain soluble carbonate salt and complex anion component; Help lend some impetus to slurry system and produce precipitated crystal.
Preferably, described crystalline mineral component is selected from sodium carbonate, salt of wormwood, Quilonum Retard, citric acid, tartrate etc.
Further preferred, described crystalline mineral component is selected from sodium carbonate and tartrate.
The preparation method who the present invention further discloses the described mineral additive for Crack Self-healing in Cementitious Materials, comprises the following steps:
(1) take each component raw material by metering;
(2) load weighted each component is poured in stirrer and stirred and make described mineral additive to mixing in 3-10 minute.
The mineral additive of Crack Self-healing in Cementitious Materials of the present invention is in the time being applied to Crack Self-healing in Cementitious Materials, and volume mixes in underground structure concrete, concrete for hydraulic structure or maritime concrete routinely.Generally speaking, the addition content of the mineral additive of Crack Self-healing in Cementitious Materials of the present invention in cement-based material is the 8-12wt% of gelling material in cement-based material.
The legal main healing mechanism of mineral self-healing is the higher feature of cement content that makes full use of in current cement-based material aquation not or part aquation, and the water that infiltrates crack from environment can impel Special Mineral Material and cement that hydration reaction occurs again,
Produce hydrate or crystallized product filling, air free concrete crack.When cement-based material produces behind crack, silica-based mineral constituent is by the Ca (OH) producing with hydrated cementitious
2effect forms hydrated calcium silicate, drated calcium aluminate gel, and these products play the effect of skeleton and support in healing thing; Silicate minerals component is met water reaction, generates the material that ettringite and calcium hydroxide etc. expand, and fills crack; The mineral constituent of expanding is in addition on the one hand by imbitition, and volume high power expands, and fracture width is reduced, and on the other hand by ion-exchange, is more conducive to the crystalline deposit of insoluble mineral; And crystalline mineral component promotes recrystallize and solids precipitation can accelerate sedimentary formation speed, make the healing product of generation more stable simultaneously.
The mineral additive of Crack Self-healing in Cementitious Materials of the present invention can be widely used in water conservancy project, prevention of marine concrete structures, underground concrete structure.The mineral additive of Crack Self-healing in Cementitious Materials can make the concrete that ftractures in water surrounding produce self-healing, and not only cost is lower, and effect is remarkable, has solved that traditional restorative procedure cost is large, the problem of weak effect, has improved the weather resistance of cement-based material.
Embodiment
By specific specific examples, technical scheme of the present invention is described below.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.
The mineral additive of the Crack Self-healing in Cementitious Materials of following examples, is made up of silica-based mineral constituent, silicate minerals component, expansion mineral constituent and crystalline mineral component, makes by stirring to mix for 3-10 minute in stirrer; According to the difference of the fracture width of required healing, by adjusting the proportioning of each feed composition, can obtain the mineral additive of different components and effect.
The component that in table 1, each ranks go out is mixed and prepared together cement composition (cement and the mineral additive that proportioning is I-III, cement is P.O.52.5 cement), again quality is accounted in the cement composition that 200% natural sand that 43% water of cement composition and quality account for cement composition adds respectively said ratio I-III and stir, in the die for molding of 70mm × 70mm × 70mm, the demoulding after 24 hours, then be placed in standard curing box maintenance, after 60 days, make the different test blocks of each proportioning form respectively the crack of 0.1-0.2mm and 0.3-0.4mm by splitting tensile test, and be numbered by table 2, the sample of cracking (is numbered to 1-6 group, every group of three test blocks) in water maintenance to each length of time (0, 3, 7, 14, 28, 60 days).
Mortar crack is carried out to the test of permeability performance in each length of time (0,3,7,14,28,60 day): sample both sides silica gel seals, the hydraulic pressure head of 160mm ± 5mm is provided, seep water from upper surface, measure the water percolating capacity of lower surface in 5min, the mean value of getting three test block test results, test result is in table 3.
The proportioning of table 1 cement composition
Numbering situation when the prefabricated different fracture width of test block of the different proportionings of table 2
Table 3 different length of time (day) water percolating capacity/g of the mortar specimen 5min that ftractures
As table 3, proportioning is that I, the numbering sample of 1-2 and admixture mineral additive of the present invention, proportioning are II, III, are numbered the contrast of 3-6, the crack of the sample that contains mineral additive of the present invention 5 minutes water percolating capacities in the time of 60 days are all 0, produce complete self-healing, but there is not yet complete self-healing in the example of contrast in the time of 60 days.Mineral additive gives mortar good self-healing capability as can be seen here.In addition, contrast proportioning II, III, the less crack effect of proportioning II healing is remarkable; And the larger crack effect of proportioning III healing is remarkable.
Other mineral additive proportionings and in cement-based material different addition quantity embodiment as shown in table 4,5; Corresponding numbering is as shown in table 6; Its test result is as shown in table 7:
The proportioning of table 4 cement composition
The proportioning of table 5 cement composition
Numbering situation when the prefabricated different fracture width of test block of the different proportionings of table 6
Table 7 different length of time (day) water percolating capacity/g of the mortar specimen 5min that ftractures
Under test condition, measure as hereinbefore, result shows that the sample that is mixed with mineral additive of the present invention has all shown good self-healing capability.
Claims (3)
1. for a mineral additive for Crack Self-healing in Cementitious Materials, formed by the component of following weight percent:
Described silica-based mineral constituent is composite and obtain by silicon ash and flyash, and wherein silica content is greater than that 60wt%, alumina content are greater than 10wt%, calcium oxide content is greater than 10wt%;
Described silicate minerals component is selected from has laminate structure and interlayer contains tradable positively charged ion, has sodium bentonite, calcium-base bentonite and the polynite of ion-exchange capacity;
Described expansion mineral constituent is composite and obtain by silico-aluminate, aluminum oxide and calcium sulfate, and wherein silica content is that 25-35wt%, alumina content are 10-20wt%, and calcium oxide content is that 15-25wt%, sulfur trioxide content are 25-35wt%;
Described crystalline mineral component is selected from sodium carbonate, salt of wormwood, Quilonum Retard, citric acid and tartrate.
2. the preparation method of a kind of mineral additive for Crack Self-healing in Cementitious Materials as described in as arbitrary in claim 1, for taking by metering after each component raw material, load weighted each component is poured in stirrer and stirred and make described mineral additive to mixing in 3-10 minute.
3. the application of a kind of mineral additive for Crack Self-healing in Cementitious Materials as described in as arbitrary in claim 1 aspect Crack Self-healing in Cementitious Materials.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904901B (en) * | 2015-12-22 | 2019-01-04 | 祎禾科技有限公司 | The reinforcement and repair mortar and preparation method thereof that shrinking percentage is zero |
| CN105645826B (en) * | 2016-01-05 | 2017-12-26 | 同济大学 | A kind of self-repair material and the concrete with the self-repair material and its preparation |
| CN106007442B (en) * | 2016-05-18 | 2018-02-09 | 同济大学 | Mineral additive and its preparation for steam curing cement based material crack self-healing |
| CN106082797B (en) * | 2016-06-06 | 2018-05-15 | 长安大学 | A kind of method for improving copper ashes powder dispersing uniformity in cement bonded sand/net slurry |
| WO2019076449A1 (en) | 2017-10-18 | 2019-04-25 | Cemex Reseach Group Ag | Method to design a self-healing concrete additionated with a permeable concrete containing biological materials |
| CN108298936B (en) * | 2018-03-30 | 2021-02-02 | 辽宁恒智科技发展有限公司 | Preparation method of self-healing cement-based material |
| CN109455978A (en) * | 2018-11-22 | 2019-03-12 | 河北盛冀新材料科技有限公司 | A kind of autogenous healing mixture, preparation method and application method |
| CN110194633B (en) * | 2019-06-18 | 2021-07-16 | 济南大学 | Concrete with intrinsic self-repairing function |
| CN110357537B (en) * | 2019-08-01 | 2021-10-08 | 中建西部建设湖南有限公司 | Self-repairing concrete using unhydrated cementitious material as repairing agent and preparation method thereof |
| CN115340314A (en) * | 2022-07-25 | 2022-11-15 | 中冶武汉冶金建筑研究院有限公司 | Additive for repairing cement-based material cracks in whole life cycle and application thereof |
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| CN102060460A (en) * | 2010-12-03 | 2011-05-18 | 上海英硕聚合物材料有限公司 | Inorganic cement capillary crystalline waterproofing agent and production process thereof |
| CN102167547A (en) * | 2010-12-22 | 2011-08-31 | 北京东方雨虹防水技术股份有限公司 | Cementitious capillary crystalline waterproof material capable of quickly repairing cracks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102060460A (en) * | 2010-12-03 | 2011-05-18 | 上海英硕聚合物材料有限公司 | Inorganic cement capillary crystalline waterproofing agent and production process thereof |
| CN102167547A (en) * | 2010-12-22 | 2011-08-31 | 北京东方雨虹防水技术股份有限公司 | Cementitious capillary crystalline waterproof material capable of quickly repairing cracks |
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