CN109946414A - A method of amount of chloride ions is combined using cement-based material oxide content characterization - Google Patents
A method of amount of chloride ions is combined using cement-based material oxide content characterization Download PDFInfo
- Publication number
- CN109946414A CN109946414A CN201910235806.1A CN201910235806A CN109946414A CN 109946414 A CN109946414 A CN 109946414A CN 201910235806 A CN201910235806 A CN 201910235806A CN 109946414 A CN109946414 A CN 109946414A
- Authority
- CN
- China
- Prior art keywords
- cement
- based material
- amount
- chloride
- oxide content
- Prior art date
- 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.)
- Granted
Links
Abstract
The invention discloses a kind of methods for combining amount of chloride ions using cement-based material oxide content characterization, include the following steps: to add slag and/or the standby cement paste sample with different oxides composition of coal ash for manufacturing first in portland cement, it is soaked in different salting liquids, the chloride ion adsorbance of each sample is tested with isothermal adsorption method, to obtain a series of chloride binding amount under different oxide content compositions, the ternary linear relationship of the two is fitted using software, realize the method for combining amount of chloride ions using oxide content characterization, to under same external condition, prepare the cement-based material that can be formed to greatest extent in conjunction with the different oxides of chloride ion.
Description
Technical field
The invention belongs to cement-based material field, in particular to it is a kind of using cement-based material oxide content characterization chlorine from
The method of sub- binding capacity.
Background technique
Cement-based material is widely used in production and living, but in the bar in chlorine salt solution condition such as ocean, deicer salts and salt lake
Under, armored concrete is faced with the serious problems of Chloride Attack, caused by steel bar corrosion be that concrete structure is caused to fail
One of most important reason.Therefore the endurance issues of concrete under chloride environment structure, become emphasis concerned by people.
Research shows that rebar surface can be destroyed when the chloride ion content in armored concrete hole solution reaches critical concentration
Passivating film causes steel bar corrosion, even destroys total object so as to cause concrete cracking.Chloride ion in concrete with
Free chloride ion and combination two kinds of forms of chloride ion exist, and just will lead to and add when only free chloride ion concentration reaches critical value
Fast steel bar corrosion, the chloride ion being combined do not influence steel bar corrosion.
Research at present thinks that chloride ion is combined to be divided into chemical bonding and physical absorption two ways: chemical bonding is primarily referred to as
Aluminium phase in clinker or the AFm phase in hydrated product and chloride binding generate the process of Friedel salt, after all with
Al in raw material2O3Amount it is closely related；All kinds of hydrated products that physical absorption refers mainly to cementitious material carry out chloride ion physical
The process of absorption.Adding Mineral Admixtures have been a concern come the method for improving cement-based material chloride binding capacity, grind
Studying carefully emphasis is grain diameter, shape and the structure etc. to doping mineral, but not to the Mineral pairs cement-based material after doping
The influence of chloride ion is further studied, and the reinforcement corrosion in cement-based material after leading to doping is ignored by existing research.
Summary of the invention
Goal of the invention: in view of the above-mentioned problems existing in the prior art, cement-based material oxygen is used the present invention provides a kind of
The method that compound content characterizes chloride binding amount, for preparing the cement-based material of precenting chlorate corrosion under equal conditions.
A kind of technical solution: side combining amount of chloride ions using cement-based material oxide content characterization of the present invention
Method, comprising the following steps:
(1) cement-based material for containing different oxide contents, the cement base are prepared by addition slag and/or flyash
In material, Al2O3、SiO2Total amount with CaO is the 85~90% of cement-based material quality, is crushed to regulation ruler after blanks and moulding and conserving
It is very little, moisture removal is removed, it is dry；
(2) it weighs broken cement-based material to be placed in the air-tight bottle containing salting liquid, reaches adsorption equilibrium；
(3) it filters and collects the soak in sample bottle, be sealed；
(4) the combination amount of chloride ions in sample is measured；
(5) calculate cement-based material oxide content in step (1), obtain the cement-based materials of different oxide contents with
Corresponding chloride binding amount establishes sample chloride binding amount CbWith oxide content χ1, χ2And χ3Between ternary linearly close
System:
Cb=A × χ1+B×χ2+C×χ3+D
Wherein CbFor cement-based material chloride binding amount, χ1Indicate Al2O3Account for the percentage of cement-based material gross mass, χ2
Indicate SiO2Account for the percentage of cement-based material gross mass, χ3Indicate that CaO accounts for the percentage of cement-based material gross mass；
(6) by step (5) different oxide contents and corresponding chloride binding amount, it is fitted Al2O3Content and chloride ion
Related coefficient A, SiO of binding capacity2Related coefficient B, CaO content and the cement-based material chloride ion of content and chloride binding amount
Binding capacity C and constant D measures oxide content in cement-based material and determines cement-based material chloride ion by obtained equation
Binding capacity.
The present invention chemically forms research cement-based material to the binding ability of chloride ion, discovery chloride binding amount with
Al in cement-based material2O3、SiO2It is closely related with the content of CaO, it overcomes and only has studied chloride binding in the prior art
Amount and Al2O3Content between relationship, the deficiency of three kinds of oxides reacted without considering chloride binding amount with participation.
The present invention characterizes chloride binding amount using cement-based material oxide content, and then according to different salting liquids, reasonable disposition
Cement-based material with corresponding oxide content improves the corrosion resistance of chloride ion ability of armored concrete, extends it and is on active service the longevity
Life.
In step (1), the broken particle size range of cement-based material is 0.25mm~2.00mm.The present invention is by cement
The broken influence for eliminating chloride ion in cement matrix blanking aperture of sill, because hole wall is very small to the adsorbance of chloride ion,
It can ignore, under the premise of not considering the transmission and diffusion of chloride ion, obtain the chloride ion content of cement-based material absorption.
In step (1), the drying is to dry in a vacuum drying oven, and vacuum degree is -1MPa to -2MPa, drying temperature
It is 20 ± 1 DEG C, drying time is 3~4d.
In step (2), the salting liquid is that the chloride solution that saturated calcium hydroxide is prepared and villaumite add sulfate liquor.
In step (4), the measurement method of the amount of chloride ions is isothermal adsorption method, specific measuring method reference standard " water
Transport engineering concrete test regulation " (JTJ270-98).
In step (1), the ratio of mud of the cement-based material is 0.25~0.5.
In step (1), the Al2O3、SiO2Total amount with CaO is 85~90%, Al of cement-based material quality2O3Content
For 5~15%, SiO of cement-based material quality2Content is the 20~30% of cement-based material quality, and CaO content is cement base
The 45~65% of quality of materials.
In step (1), the ratio of mud of the cement-based material is 0.48~0.5.
The utility model has the advantages that (1) present invention considers Al simultaneously2O3、SiO2Influence with the content of CaO to chloride binding amount, obtains
Relationship between chloride binding amount and oxide obtains the maximum cement-based material of amount of chloride ions, anti-for preferably preparation
The chloride binding amount of any oxide content composition provides theoretical reference under chloride erosion concrete similarity condition；(2) this hair
The bright influence for eliminating pore structure and ion transmission, this method chemically organize the essential problem that subangle considers chloride binding,
Obtained chloride binding amount more has essential meaning, and method is simple and easy to get.
Detailed description of the invention
Fig. 1 is the cement-based material oxide content and chloride ion that curing age is 28d impregnates chloride solution 28d in example
Binding capacity relational graph.
Fig. 2 is the cement-based material oxide content that curing age is 28d impregnates that villaumite adds sulfate liquor 28d in example
With chloride binding magnitude relation figure.
Fig. 3 is the method for the present invention flow chart.
Specific embodiment
One, raw material preparation
The preparation of 1.1 cement-based materials
Because slag and flyash improve favorably precenting chlorate corrosion performance, most widely used, this method selects both
Mineral admixture replacing partial cement studies the relationship between cement-based material oxide content and chloride binding amount, specifically
Sample preparation methods are as follows: illustrate the method for the present invention using net slurry sample as typical cement-based material.It selects marked as 52.5
Ordinary portland cement (C), wherein add 10%, 30% and 50% flyash (I grade of Class F fly ash of FA, F class), 10%,
30% and 50% slag (BS, S95 slag) is prepared for the cement paste sample that the ratio of mud is 0.48, and after standard curing 28 days
It is to be measured.
1.2 prepare saturated calcium hydroxide solution, prepare chloride solution with the saturated calcium hydroxide solution of preparation, prepare respectively
1mol/L NaCl solution and 1mol/L NaCl solution and 0.35mol/L Na2SO4Mixing salt solution, simulate different water bodys
Environment.
Two, the measurement of chloride binding amount
Embodiment 1:
Step 1: the cement-based material surface moisture conserved being cleaned, is broken into particle, obtaining particle size range is
The particulate samples of 0.25mm~2.00mm.The particulate samples for being crushed to predetermined size are put into vacuum oven, vacuum is dry
Dry case vacuum degree is -1MPa, and temperature is 20 ± 1 DEG C, dry, and removal wherein moisture makes particulate samples constant mass, then will
Grain sample, which is put into the drier equipped with silica gel and soda lime, continues drying, stores to remove the CO in air2。
Step 2: weighing the sample that 10g is handled well and be placed in air-tight bottle, pipette 20ml saturated calcium hydroxide with pipette and match
The chloride solution of system, chloride solution concentration are 1mol/L, and room temperature is standing and soaking 28d to reach adsorption equilibrium.
Step 3: reaching the soak of balance in filtering sample bottle, collect and be sealed.
Step 4: the combination amount of chloride ions in sample is measured by isothermal adsorption method.
Step 5: being only to change Al in 1mol/L solution in chloride solution concentration2O3、SiO2With tri- kinds of oxide contents of CaO
Influence to cement-based material chloride binding capacity calculates the oxide content of each sample of step 1 first, uses χ1It indicates
Al2O3Content, χ2Indicate SiO2Content, χ3Indicate CaO content, (85% < χ1+χ2+χ3< 90%) a series of different oxides, are obtained
Chloride binding amount (being shown in Table 1) under content and correspondence.Establish sample chloride binding amount CbWith oxide content χ1, χ2And χ3
Between ternary linear relationship Cb=A × χ1+B×χ2+C×χ3+D.By a series of above-mentioned different oxide contents and corresponding chlorine from
Sub- binding capacity is brought into, is acquired coefficient A, B, C and D by software fitting, is obtained complete equation:
Cb=21.683 × χ1+91.964×χ2-23.291×χ3+7.810
Hereafter the oxide content composition of certain known cement-based material, can know according to formula and invade in 1mol/L NaCl solution
Under erosion, the maximum chloride binding amount of this material, and matching for oxide content can be obtained according to desired chloride binding amount
Than the cement-based material that, Fig. 1 can intuitively obtain maintenance 28d, after the chloride solution 28d for impregnating 1mol/L, chloride binding amount with
Al2O3、SiO2Content is proportional, inversely with CaO content, when cement-based material is prepared, correspondinglys increase Al2O3、
SiO2Content can be improved chloride binding amount.
Embodiment 2:
Step 1: the cement-based material surface moisture conserved being cleaned, is broken into particle, obtaining particle size range is
The particulate samples of 0.25mm~2.00mm.The particulate samples for being crushed to predetermined size are put into vacuum oven, vacuum is dry
Dry case vacuum degree is -1MPa, and temperature is 20 ± 1 DEG C, dry, and removal wherein moisture makes particulate samples constant mass, then will
Grain sample, which is put into the drier equipped with silica gel and soda lime, continues drying, stores 2 days to remove the CO in air2。
Step 2: weighing the sample that 10g is handled well and be placed in air-tight bottle, it is molten to pipette 20ml saturated calcium hydroxide with pipette
The composite compaction technique that liquid is prepared, solution composition are 1mol/L NaCl solution+0.35mol/L Na2SO4Solution, room temperature are standing and soaking
28d is to reach adsorption equilibrium.
Step 3: reaching the soak of balance in filtering sample bottle, collect and be sealed.
Step 4: the combination amount of chloride ions in sample is measured by isothermal adsorption method.
Step 5: calculating the oxide content of each sample of step 1, use χ1Indicate Al2O3Content, χ2Indicate SiO2Content,
χ3Indicate CaO content, (85% < χ1+χ2+χ3< 90%) a series of chloride binding under obtaining different oxide contents and corresponding to
It measures (being shown in Table 1).Establish sample chloride binding amount CbWith oxide content χ1, χ2And χ3Between ternary linear relationship Cb=A × χ1+
B×χ2+C×χ3+D.A series of above-mentioned different oxide contents and corresponding chloride binding amount are brought into, are fitted by software
Coefficient A, B, C and D are acquired, complete equation is obtained:
Cb=47.453 × χ1+75.486×χ2-26.165×χ3+4.437
Hereafter the oxide content composition of certain known cement-based material, can be known according to formula 1mol/L NaCl solution with
0.35mol/L Na2SO4Under solution corrodes, the maximum chloride binding amount of this material, and can be according to desired chloride binding
Amount, obtains the proportion of oxide content.
From figure 2 it can be seen that the cement-based material of maintenance 28d, impregnates 1mol/L NaCl solution and 0.35mol/L
Na2SO4After mixed solution 28d, chloride binding amount and Al2O3、SiO2Content is proportional, inversely with CaO content.
When cement-based material is prepared, Al is correspondinglyd increase2O3、SiO2Content can be improved chloride binding amount.
Contained oxide content and chloride binding amount in 1 each sample of table
The present invention, which is set out by the adsorption capacity to cement-based material chloride ion with the oxide of significant effects, to be changed
Group subangle considers the essential problem of chloride binding, does not consider pore structure and ion transmission problem, obtained chloride ion knot
Resultant establishes essential connection by the oxide content and chloride binding amount of admixture, to prepare anti-chlorine salt under equal conditions
The cement-based material of erosion refers to, and is applicable in for the cement-based material that these three oxides are Main chemical component is possessed,
More there is essential application value in practical applications, and method is simple and easy to get.
In conclusion only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any
Those skilled in the art within the technical scope disclosed by the invention, can without the variation that creative work is expected or
Replacement, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be limited with claims
Subject to fixed protection scope.
Claims (8)
1. a kind of method for combining amount of chloride ions using cement-based material oxide content characterization, which is characterized in that including following
Step:
(1) cement-based material for containing different oxide contents, the cement-based material are prepared by addition slag and/or flyash
In, Al2O3、SiO2Total amount with CaO is the 85~90% of cement-based material quality, is crushed to predetermined size after blanks and moulding and conserving, goes
Moisture removal, it is dry；
(2) it weighs broken cement-based material to be placed in the air-tight bottle containing salting liquid, reaches adsorption equilibrium；
(3) it filters and collects the soak in sample bottle, be sealed；
(4) the combination amount of chloride ions in sample is measured；
(5) calculate cement-based material oxide content in step (1), obtain the cement-based materials of different oxide contents with it is corresponding
Chloride binding amount, establish sample chloride binding amount CbWith oxide content χ1, χ2And χ3Between ternary linear relationship:
Cb=A × χ1+B×χ2+C×χ3+D
Wherein CbFor cement-based material chloride binding amount, χ1Indicate Al2O3Account for the percentage of cement-based material gross mass, χ2It indicates
SiO2Account for the percentage of cement-based material gross mass, χ3Indicate that CaO accounts for the percentage of cement-based material gross mass；
(6) by step (5) different oxide contents and corresponding chloride binding amount, it is fitted Al2O3Content and chloride binding
Related coefficient A, SiO of amount2Related coefficient B, CaO content and the cement-based material chloride binding of content and chloride binding amount
C and constant D is measured, by obtained equation, oxide content in cement-based material is measured and determines cement-based material chloride binding
Amount.
2. the method according to claim 1 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (1), the broken particle size range of cement-based material is 0.25mm~2.00mm.
3. the method according to claim 1 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (1), the drying is to dry in a vacuum drying oven, and vacuum degree is -1MPa to -2MPa, and drying temperature is
20 ± 1 DEG C, drying time is 3~4d.
4. the method according to claim 1 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (2), the salting liquid is that the chloride solution that saturated calcium hydroxide is prepared and villaumite add sulfate liquor.
5. the method according to claim 1 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (4), the measurement method of the amount of chloride ions is isothermal adsorption method.
6. the method according to claim 1 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (1), the ratio of mud of the cement-based material is 0.25~0.5.
7. the method according to claim 1 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (1), the Al2O3、SiO2Total amount with CaO is 85~90%, Al of cement-based material quality2O3Content
For 5~15%, SiO of cement-based material quality2Content is the 20-30% of cement-based material quality, and CaO content is cement matrix
Expect the 45~65% of quality.
8. the method according to claim 6 for combining amount of chloride ions using cement-based material oxide content characterization, special
Sign is, in step (1), the ratio of mud of the cement-based material is 0.48~0.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910235806.1A CN109946414B (en) | 2019-03-27 | 2019-03-27 | Method for representing amount of combined chloride ions by using content of cement-based material oxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910235806.1A CN109946414B (en) | 2019-03-27 | 2019-03-27 | Method for representing amount of combined chloride ions by using content of cement-based material oxide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109946414A true CN109946414A (en) | 2019-06-28 |
| CN109946414B CN109946414B (en) | 2022-03-08 |
Family
ID=67011631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910235806.1A Active CN109946414B (en) | 2019-03-27 | 2019-03-27 | Method for representing amount of combined chloride ions by using content of cement-based material oxide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109946414B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973757A (en) * | 2016-04-28 | 2016-09-28 | 东南大学 | Method for obtaining chlorine ion diffusion and combination parameters in cement-based material |
| EP3130571A1 (en) * | 2015-07-01 | 2017-02-15 | Enrico Canti | A method for making a natural binder for manufacturing of compound articles |
| CA2993307A1 (en) * | 2015-08-10 | 2017-02-16 | Cemex Research Group Ag | Fly ash based castable construction material with controlled flow and workability retention |
| CN106872641A (en) * | 2017-04-10 | 2017-06-20 | 东南大学 | A kind of cement-based material chloride binding amount method for measuring |
| WO2017162698A1 (en) * | 2016-03-22 | 2017-09-28 | Sika Technology Ag | Admixture |
| WO2018081688A1 (en) * | 2016-10-31 | 2018-05-03 | Imerys Filtration Minerals, Inc. | Composite filter aids and methods of using composite filter aids |
-
2019
- 2019-03-27 CN CN201910235806.1A patent/CN109946414B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3130571A1 (en) * | 2015-07-01 | 2017-02-15 | Enrico Canti | A method for making a natural binder for manufacturing of compound articles |
| CA2993307A1 (en) * | 2015-08-10 | 2017-02-16 | Cemex Research Group Ag | Fly ash based castable construction material with controlled flow and workability retention |
| WO2017162698A1 (en) * | 2016-03-22 | 2017-09-28 | Sika Technology Ag | Admixture |
| CN105973757A (en) * | 2016-04-28 | 2016-09-28 | 东南大学 | Method for obtaining chlorine ion diffusion and combination parameters in cement-based material |
| WO2018081688A1 (en) * | 2016-10-31 | 2018-05-03 | Imerys Filtration Minerals, Inc. | Composite filter aids and methods of using composite filter aids |
| CN106872641A (en) * | 2017-04-10 | 2017-06-20 | 东南大学 | A kind of cement-based material chloride binding amount method for measuring |
Non-Patent Citations (3)
| Title |
|---|
| ANDREJ IPAVEC 等: "Chloride binding into hydrated blended cements: The influence of limestone and alkalinity", 《CEMENT AND CONCRETE RESEARCH》 * |
| 余红发: "磨细矿渣粉掺量对混凝土氯离子结合能力的影响", 《高性能混凝土和矿物掺合料的研究与工程应用技术交流会》 * |
| 张程浩: "含 Al2O3掺合料对水泥浆 Cl-固定能力的影响及其机理", 《中国优秀硕士学位论文全文数据库工程科技II辑C038-872》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109946414B (en) | 2022-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Matias et al. | Lime mortars with ceramic wastes: characterization of components and their influence on the mechanical behaviour | |
| Tsivilis et al. | The effect of clinker and limestone quality on the gas permeability, water absorption and pore structure of limestone cement concrete | |
| CN107673696A (en) | A kind of foam concrete self-insulating wall material and preparation method thereof | |
| CN102515617B (en) | Concrete anti-corrosion etching resisting agent and preparation method thereof | |
| CN111285654A (en) | Preparation method of desulfurization building gypsum-based composite cementing material | |
| CN106278104B (en) | Autoclaved lime-sand brick and preparation method thereof | |
| CN110294611A (en) | A kind of room temperature weak base ground polymers excited cement soil and its preparation process | |
| CN105130347A (en) | Preparation method of high-work-performance regenerated concrete | |
| CN106830873A (en) | Multi-functional composite magnesium silicate heat preserving and insulating material formula and preparation technology | |
| Rashwan et al. | Effect of local metakaolin on properties of concrete and its sulphuric acid resistance | |
| CN113979716A (en) | Preparation method of magnesium oxysulfate cementing material adopting silicon dioxide aerogel and building component | |
| CN110922114B (en) | Method for preparing porous cement-based material by using activated carbon material | |
| CN110818290B (en) | Preparation method of high corrosion-resistant portland cement | |
| CN110156405B (en) | Plateau impervious concrete material and preparation method thereof | |
| CN110950566B (en) | High-corrosion-resistance submicron composite material and application thereof | |
| CN109946414A (en) | A method of amount of chloride ions is combined using cement-based material oxide content characterization | |
| CN114195436A (en) | Recycled concrete replaced by brick-concrete recycled fine aggregate and preparation method thereof | |
| Ramjan et al. | Effects of Binary and Ternary Blended Cements Made from Palm Oil Fuel Ash and Rice Husk Ash on Alkali–Silica Reaction of Mortar | |
| Hisham et al. | Utilization of cockle shells as partial binder replacement in concrete | |
| Fu et al. | The influences of siliceous waste on blended cement properties | |
| CN1272275C (en) | Manufacturing method of light-weight building block for internal, external wall | |
| CN114149223A (en) | Recycled concrete replaced by brick-concrete recycled coarse and fine aggregates and preparation method thereof | |
| CN107445527A (en) | A kind of method for reducing concrete permeability and water imbibition | |
| CN114195437A (en) | Recycled concrete replaced by brick-concrete recycled coarse aggregate and preparation method thereof | |
| Nilantha et al. | Structural and thermal performances of rice husk ash (RHA) based sand cement block |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |