CN107721322A - A kind of Low background value concrete and preparation method thereof - Google Patents
A kind of Low background value concrete and preparation method thereof Download PDFInfo
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- CN107721322A CN107721322A CN201711171383.9A CN201711171383A CN107721322A CN 107721322 A CN107721322 A CN 107721322A CN 201711171383 A CN201711171383 A CN 201711171383A CN 107721322 A CN107721322 A CN 107721322A
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- concrete
- background value
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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
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
A kind of Low background value concrete and preparation method thereof, wherein Low background value concrete include following parts by weight of component, cement：399kg~434kg；Water：139kg~140kg；Fine aggregate：806kg~863kg；Coarse aggregate：973kg~985kg；Water reducer：10.6kg~11.5kg.After the present invention solves that traditional Low background value concrete pumping is poor, bleeding is serious, the slump can not be detected accurately, concrete strength is difficult to ensure that and is molded there is the technical problem of the more mass defect such as honeycomb, pitted skin, crack in surface of concrete structure.
Description
Technical field
The invention belongs to technical field of concrete preparation, more particularly to a kind of Low background value concrete and preparation method thereof.
Background technology
In having the lab construction for being used for scientific research and detecting of sensitivity requirement to background values, to the background values of various raw material
Index request it is very high, Low background value concrete is quartz, quartz sand, the low hydration heat portland cement using Low emissivity,
It is blended with polycarboxylic acids inorganic compounding water reducer by grading, prepares low hydration heat, Low emissivity, the concrete of Low background value, its
Radionuclide K-40, Ra-226 and Th-232 numerical value in main material is relatively low, effectively shields cosmic ray and itself radiation
Influence of the property element to Low background spectrometer measurement result.The Dose Rate of national natural gamma radiation about 110nGy/h is left
The right side, normal concrete architecture indoor Dose Rate are 190nGy/h.The whole nation is in the Low background built and come into operation at present
Laboratory only has 2, by being formed from Low emissivity cement, quartz, quartz sand, concrete additive grading blending and stirring
Laboratory background values Dose Rate can only be controlled 50nGy/h by concrete.Chinese invention patent CN103803901 is also
A kind of barite radioresistance pump concrete is disclosed, the invention realizes concrete by adding expensive barite
Radioresistance.Chinese invention patent CN103755204, which is disclosed, is particularly a kind of cracking resistance radiation proof in concrete additive field
Concrete additive, the invention are also required to add barite and other additives to realize.Chinese invention patent
CN104817304B discloses one kind and prepares radioresistance concrete using boracic mill tailings, by adding boracic mine tail
Ore deposit realizes the radioresistance of concrete.But foregoing invention can not effectively reduce background values, and the other materials added can be made
It is that this can only select the low quartz of Low emissivity, quartz sand and polycarboxylic acids inorganic multiple into the increase of concrete radiation background value
Condensation material water reducer configures Low background value concrete as raw material.The whole nation, which has been constructed, at present completes 2 Low background laboratories, institute
With the pumping of Low background value concrete is poor, bleeding is serious, the slump can not be detected accurately, be gelled material during concrete vibrating
Material is lost in along plate stitch, concrete strength is difficult to ensure that, formation of concrete visual defects are more, generally existing honeycomb, pitted skin phenomenon,
Addition cement expansive material background values is higher, and hydration heat of cement is larger, bottom plate, top plate the defects of crack is present.
The content of the invention
The present invention proposes a kind of Low background value concrete and preparation method thereof, to solve traditional Low background value concrete
The concrete component table that pumping is poor, bleeding is serious, the slump can not be detected accurately, concrete strength is difficult to ensure that and is molded
See the technical problem that the more mass defect such as honeycomb, pitted skin, crack be present.
Technical solution of the present invention is as follows.
A kind of Low background value concrete, including following parts by weight of component.
Cement：399kg~434kg；
Water：139kg~140kg；
Fine aggregate：806kg~863kg；
Coarse aggregate：973kg~985kg；
Water reducer：10.6kg~11.5kg.
Wherein, cement be PN42.5 nuclear power engineerings portland cement, the radionuclide specific activity higher limit of cement
It is as follows：
Table 1：Cement radionuclide specific activity higher limit
Coarse aggregate is 2.36mm~25.0mm particle diameters, and the quartz of continuous grading, the radionuclide ratio of coarse aggregate are lived
It is as follows to spend higher limit：
Table 2：Quartz radionuclide specific activity higher limit
Fine aggregate is 0.18mm~2.36mm particle diameters, and the quartz sand of continuous grading, the radionuclide ratio of fine aggregate are lived
It is as follows to spend higher limit：
Table 3：Quartz sand radionuclide ratio higher limit
The radionuclide specific activity higher limit of water reducer is as follows：
Table 4：Water reducer radionuclide ratio higher limit
Preferably, the wet concentration drinking water.
Preferably, the quartz sand graduation sieve ratio in the fine aggregate is as follows：
Table 5：The grading, screening ratio of quartz sand
Preferably, the quartz grading, screening ratio in the coarse aggregate is as follows：
Table 6：The grading, screening ratio of quartz
Preferably, the water reducer is RSW-02D polycarboxylate composite water reducing agents.
A kind of preparation method of Low background value concrete, including step are as follows.
Step 1, according to the gross mass of prepared concrete, calculate the quality of each component.
Step 2, according to the amount calculated, coarse aggregate, fine aggregate and cement are put into concrete agitator.
Step 3, it is stirred, the total of the water that is calculated is added in the compound in uniformly backward step 2 to be mixed
The half of quality.
Step 4, diminishing agent solution is prepared, and the diminishing agent solution configured is added in concrete agitator.
Step 5, second half water is added in concrete agitator, continue to stir 90s~105s.
Preferably, the coarse aggregate in step 2, fine aggregate and cement add water mud according to quartz is first added, and then add stone
The order of sand feeds intake successively.
Preferably, in the diminishing agent solution prepared in step 4, the ratio of water reducer and water is every cubic metre of Low background
It is worth 2 times of water reducer and water ratio in concrete.
Preferably, the concrete agitator is stirred using strong concrete standard list horizontal axis concrete mixer or concrete
The mixer of concrete production of standing line.
Compared with prior art the invention has the characteristics that and beneficial effect.
1st, a kind of Low background value preparation method of concrete announced in the present invention, Low background value concrete need concrete sheet
Body has relatively low background values, to meet that the background values higher than scientific research testing requirements will not be produced after for laboratory entity,
And it can prevent external radiation from detecting the interference of data to scientific research.
2nd, the present invention selects coarse aggregate, fine aggregate, low hydration heat cement, polycarboxylate composite water reducing agent, the drink of continuous grading
The concrete mixed together with running water, its water-retaining property, good fluidity, effectively solves Low background value concrete pumpability
The problems such as difference, bleeding stream slurry, concreting one-shot forming quality is lifted, low of structural solid after Low background value concrete formation
Floors meets technological requirement.
3rd, the purpose of the present invention is the influence and Low background value for overcoming the radiation of construction material background values itself to laboratory
The influence of concrete solid construction quality, by preferred material and mixtures optimal design, reject concrete micro-expanding agent, flyash etc.
The use of additive, the service behaviour of concrete is improved, keep good workability, reduce the concrete heat of hydration at initial stage, lifting
Concrete construction operability, ensure the intensity requirement of concrete component, 30nGy/h is arrived into background values control.
4th, the present invention be used only Low emissivity polycarboxylic acids inorganic compounding water reducer adjustment workability of concrete, reject swelling agent,
The additives such as flyash use, and the exaggerated conditions limitation for preventing cement expansive material causes Shrinkage Cracking of Concrete, reduces coagulation
Native Dose Rate, avoid influence of the additive to Low background value.
5th, the coarse aggregate in the present invention, fine aggregate use in nature the low quartz mine of specific radioactivity according to continuous
Grading processes, effective guarantee concrete Low background value and strength grade.
6th, the Low background value concrete in the present invention is using the relatively low low hydration heat portland cement of background values, the heat of hydration compared with
It is low, drying shrinkage is smaller, quality stability is preferable, ensures concrete mix workability, reduce the mass concrete heat of hydration and concentrate
Discharge, avoid concrete component harmful cracks from producing.
7th, the Low background value concrete in the present invention determines optimum mix proportion by more suboptimization trials, captures concrete and secretes
The technical barriers such as water, the slump accurately detect, pumping；It is good using the match ratio Low background value concrete workability in the present invention
Good, operability stabilization, can ensure concrete structure once Cheng You.
8th, in traditional normal concrete constituent, additive used has radioactivity, therefore additive is added in concrete
Species is more or dosage is bigger, it is bigger that the contribution of Low background value concrete background values is influenceed；The present invention is by repeated detection, examination
Match somebody with somebody and through be expounded through peer review confirm, RSW-02D polycarboxylate composite water reducing agent radioactivity it is minimum and can guarantee that realize it is pumpable low
The match ratio of background values concrete, therefore using only Low emissivity polycarboxylic acids inorganic compounding water reducer adjustment workability of concrete, can
Realize that concrete configuration and can effectively controls concrete background values.
Brief description of the drawings
Fig. 1 is the flow chart of the preparation method of Low background value concrete in the present invention.
Embodiment
The present invention is further described below in conjunction with example, but the present invention is not limited to following instance.
Prepare embodiment
As shown in figure 1, the preparation method of this Low background value concrete, it is comprised the following steps that.
Step 1, according to the gross mass of prepared concrete, calculate the quality of each component.
Step 2, according to the amount calculated, put into quartz, cement and quartz sand successively into concrete agitator；This
Locating the concrete stirring feeding sequence is the rational sequence of code requirement, and can guarantee that stone, cement etc. stir, and prevents
Sealing mud gathers materials to wrap with other thicknesses together enters mixing machine, quickly forms small cement granule after meeting water, the ratio of mud is smaller
This caking is more serious
Step 3, it is stirred, the total of the water that is calculated is added in the compound in uniformly backward step 2 to be mixed
The half of quality.
The ratio of step 4, preparation diminishing agent solution, water reducer and water is 1:25.68, and the water reducer configured is molten
Liquid is added in concrete agitator.
Step 5, second half water is added in concrete agitator, continue to stir 90s~105s.
In the present embodiment, the concrete agitator uses laboratory's strong concrete standard list horizontal axis concrete mixer
It can be stirred with large-scale 2 kinds of mixer with concrete mixing plant concrete production line.
In the present embodiment, the special portland cement of cement selection PN42.5 nuclear power engineerings, its radionuclide specific activity is shown in
Table 1.
Table 1：Cement radionuclide specific activity (unit：Bq/kg)
Coarse aggregate is from 2.36~25.0mm particle diameters and the quartz of continuous grading, its radionuclide specific activity and level
2 are shown in Table with sieve ratio.
Table 2：Quartz radionuclide specific activity (unit：) and grading, screening ratio Bq/kg
In the present embodiment, from 0.18-2.36mm particle diameters and the quartz sand (middle sand) of continuous grading, it is radiated fine aggregate
Property Nuclides Activity Ratio and grading, screening ratio are shown in Table 3.
Table 3：Quartz sand radionuclide specific activity (unit：) and grading, screening ratio Bq/kg
In the present embodiment, additive selects RSW-02D polycarboxylate composite water reducing agents, and its radionuclide specific activity is shown in Table 4：
Table 5：Polycarboxylate composite water reducing agent radionuclide specific activity (unit：Bq/kg)
In the present embodiment, mixing water selects drinking public water supply.
In the present embodiment, C35 Low background value concrete mixs are shown in Table 6.
The C35 Low background value concrete mixs of table 6
| Component (part) | Prepare 1 | Prepare 2 | Prepare 3 |
| Cement | 420 | 399 | 434 |
| Water | 140 | 140 | 139 |
| Quartz sand | 837 | 863 | 806 |
| Quartz | 983 | 973 | 985 |
| Water reducer | 10.9 | 10.6 | 11.5 |
The concrete agitator is stirred using laboratory with strong concrete standard list horizontal axis concrete mixer and concrete
Station concrete production line is mixed with large-scale 2 kinds of stirring 90-105S of mixer.
In the present embodiment, in the diminishing agent solution prepared in step 4, the ratio of water reducer and water is per square Low background value
2 times of water reducer and water ratio in concrete, it is actual to take water reducer according to concrete mix：Water=1:21.53~1:
25.69。
In the present embodiment, from the coarse aggregate of continuous grading, fine aggregate, low hydration heat cement, polycarboxylate composite water reducing agent,
The concrete that drinking public water supply mixes together, its water-retaining property, good fluidity, effectively solves Low background value concrete pumping
The problems such as difference, bleeding stream slurry, concreting one-shot forming quality is lifted, low of structural solid after Low background value concrete formation
Floors meets technological requirement.
In above-mentioned preparation embodiment, the Low background value water-binder ratio of preparation is not less than 0.33；Stone wherein used
The quality of sand is 806-863kg/m3, the quality of quartz is 973-985kg/m3；Quartz sand used and the nucleic of quartz
Content Ra-226≤0.91, Th-232≤1.6, K-40≤6.5.
Low background value concrete is prepared using by above-mentioned preparation embodiment, the data such as table 7 obtained by experiment：.
The different material dosage experimental data contrast table of table 7
Comparative example 1
Control group and 2 test groups are set respectively, and control group is to be prepared according to the method prepared described in embodiment 1
Low background value concrete, test group 1-1 is identical with the raw materials used proportioning in control group, but coarse aggregate quartz, fine aggregate
Ordinary gravel, middle sand is respectively adopted in quartz sand；Test group 1-2 is identical with the raw materials used proportioning in control group, but cement is adopted
With P.O.42.5 Portland cements；Test group 1-3 is identical with the raw material in control group, and proportioning is matched somebody with somebody using normal concrete
Than specific component and dosage are as shown in table 8.
The component and dosage for the gelling system that the test group of table 8 uses
| (part) | Control group | Test group 1-1 | Test group 1-2 | Test group 1-3 |
| Cement | 420 | 420 | 420 | 275 |
| Water | 140 | 140 | 140 | 175 |
| Fine aggregate | 837 | 837 | 837 | 834 |
| Coarse aggregate | 983 | 983 | 983 | 979 |
| Additive | 10.9 | 10.9 | 10.9 | 9.1 |
| Admixture | / | / | / | 120 |
The Low background value concrete of preparation compression strength and slump consistancy test, specific result of the test such as table 9 have been subjected to
It is shown.
The performance test results of each set product of the comparative example 1 of table 9
| The performance and data surveyed | Control group | Test group 1-1 | Test group 1-2 | Test group 1-3 |
| Strength grade | C35 | C35-C40 | C35 | C35 |
| The slump | 190 | 190 | 190 | 190 |
| Workability | Well | Well | Well | Well |
| Pumping | Well | Preferably | Well | Well |
| Architecture indoor Dose Rate | 23~27 | 65-75 | 89-109 | 150~180 |
It can be drawn by above-mentioned experiment：
1. radiological operations selected by present example are than low PN42.5 nuclear power engineerings portland cement, quartz sand, stone
The background values for the C35 concrete that diamond stone, RSW-02D polycarboxylate composite water reducing agents configure is minimum.
Workability of concrete is good after 2. Low background value concrete only adds the adjustment of RSW-02D polycarboxylate composite water reducing agents.
3. concrete mix raw material are as follows to the influence degree of background values：Mix water influences minimum, can neglected
Slightly disregard, sand, stone have a great influence, and cement is maximum to background values, i.e., is ordered as according to influence degree：Cement ＞ sands, stone
Sub- ＞ mixing waters；Additive main function is regulation workability of concrete and is respectively provided with radioactivity, adds species less or uses
Amount is fewer smaller on background values influence, should reduce additive species on the premise of workability of concrete is ensured, reduces additive
Dosage simultaneously selects the low additive of Low background value.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention covers art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (9)
1. a kind of Low background value concrete, it is characterised in that including following parts by weight of component：
Cement：399kg~434kg；
Water：139kg~140kg；
Fine aggregate：806kg~863kg；
Coarse aggregate：973kg~985kg；
Water reducer：10.6kg~11.5kg；
Wherein, cement is the portland cement of PN42.5 nuclear power engineerings, and the radionuclide specific activity higher limit of cement is as follows：
Table 1：Cement radionuclide specific activity higher limit
Coarse aggregate is 2.36mm~25.0mm particle diameters, and the quartz of continuous grading, in the radionuclide specific activity of coarse aggregate
Limit value is as follows：
Table 2：Quartz radionuclide specific activity higher limit
Fine aggregate is 0.18mm~2.36mm particle diameters, and the quartz sand of continuous grading, in the radionuclide specific activity of fine aggregate
Limit value is as follows：
Table 3：Quartz sand radionuclide ratio higher limit
The radionuclide specific activity higher limit of water reducer is as follows：
Table 4：Water reducer radionuclide ratio higher limit
A kind of 2. Low background value concrete according to claim 1, it is characterised in that：The wet concentration drinking water.
A kind of 3. Low background value concrete according to claim 1, it is characterised in that：Quartz sand level in the fine aggregate
It is as follows with sieve ratio：
Table 5：The grading, screening ratio of quartz sand
A kind of 4. Low background value concrete according to claim 1, it is characterised in that：Quartzy stone step in the coarse aggregate
It is as follows with sieve ratio：
Table 6：The grading, screening ratio of quartz
A kind of 5. Low background value concrete according to claim 1, it is characterised in that：The water reducer gathers for RSW-02D
Carboxylic acid composite water-reducing agent.
A kind of 6. preparation method of the Low background value concrete in claim 1-5 described in any one, it is characterised in that including
Step is as follows：
Step 1, according to the gross mass of prepared concrete, calculate the quality of each component；
Step 2, according to the amount calculated, coarse aggregate, fine aggregate and cement are put into concrete agitator；
Step 3, it is stirred, the gross mass for the water being calculated is added in the compound in uniformly backward step 2 to be mixed
Half；
Step 4, diminishing agent solution is prepared, and the diminishing agent solution configured is added in concrete agitator；
Step 5, second half water is added in concrete agitator, continue to stir 90s~105s.
7. the preparation method of Low background value concrete according to claim 6, it is characterised in that：Thick bone in step 2
Material, fine aggregate and cement add water mud according to quartz is first added, and then add the order of quartz sand to feed intake successively.
8. the preparation method of Low background value concrete according to claim 6, it is characterised in that：That is prepared in step 4 subtracts
In aqua, 2 times of water reducer and water ratio in the Low background value concrete that the ratio of water reducer and water is every cubic metre.
9. the preparation method of Low background value concrete according to claim 6, it is characterised in that：The concrete agitator
Using strong concrete standard list horizontal axis concrete mixer or the mixer of concrete mixing plant concrete production line.
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| CN111499307A (en) * | 2020-04-28 | 2020-08-07 | 广西大学 | Use of coral sand and/or coral skeleton in the construction of low background laboratories |
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