CN110181686A - A method of it is designed according to the slump and configures laboratory flow concrete - Google Patents
A method of it is designed according to the slump and configures laboratory flow concrete Download PDFInfo
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- CN110181686A CN110181686A CN201910526496.9A CN201910526496A CN110181686A CN 110181686 A CN110181686 A CN 110181686A CN 201910526496 A CN201910526496 A CN 201910526496A CN 110181686 A CN110181686 A CN 110181686A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
- B28C5/006—Methods for mixing involving mechanical aspects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0404—Proportioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0422—Weighing predetermined amounts of ingredients, e.g. for consecutive delivery
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The present invention provides a kind of method designed according to the slump and configure laboratory flow concrete, only need the concrete slump and existing material according to required configuration, by selection, calculating and the configuration to sand coarse aggregate ratio, the ratio of mud, gas volume, water consumption, mixing time, cement consumption and aggregate dosage, the accurate concrete of the slump is obtained, carrying out simple adjustment can be obtained the concrete of the accurate slump.The present invention can make full use of laboratory current material, effectively improve the accuracy of allocative efficiency and the slump without taking into account the performances such as late strength of concrete and durability.
Description
Technical field
The invention belongs to civil engineering material technical fields, and in particular to a kind of to be designed according to the slump and configure laboratory
The method of fluidity concrete.
Background technique
Mix Design mainly determines the dosage of various composition materials in concrete, i.e. one cubic metre of coagulation
The quality of each ingredient in soil, the research of this aspect had been carried out for more than 100 years, and in mix-design, main consideration is newly mixed mixed
The working performance (such as slump) of soil and the mechanical property (such as intensity, durability) of maturing are coagulated, in the prior art
The above method, can be designed that the concrete for meeting engine request, but its design method is complicated, Consideration is more, right
The requirement of a variety of materials is more stringent.
Under laboratory conditions, in the test of some research fresh concrete rheological properties, without the concern for concrete
Mechanical property after condensation hardening, and it is higher to the slump required precision of concrete, it needs to push away match ratio by the way that the slump is counter,
And then slump concrete mix parameter identical with expected value is obtained, meanwhile, the cooperation of the concrete of the identical slump
Than that may have very big difference.It would therefore be desirable to it is a kind of by the slump and current material, to calculate the letter of concrete mix
Easy method can make full use of the material under laboratory condition, efficiently and accurately determine concrete mix, be particularly suitable for reality
Test room high slump concrete check experiment.
Summary of the invention
Present invention aims to solve the deficiencies of the prior art, and provides a kind of a kind of to design according to the slump and configure laboratory stream
The method of dynamic property concrete, it is only necessary to according to required concrete slump and current material, accordingly be calculated and be matched by step
It sets, the accurate concrete of the slump can be obtained, carrying out simple adjustment can be obtained the concrete of the accurate slump.
The invention adopts the following technical scheme:
A method of it is designed according to the slump and configures laboratory flow concrete, which is characterized in that only needed according to needed for
The concrete slump and existing material to be configured, when by sand coarse aggregate ratio, the ratio of mud, gas volume, water consumption, stirring
Between, selection, calculating and the configuration of cement consumption and aggregate dosage, obtain the accurate concrete of the slump, simply adjusted
The whole concrete that the accurate slump can be obtained.
Further, the present invention specifically includes the following steps:
S1, sand coarse aggregate ratio is determined:
Sand coarse aggregate ratio S% is determined according to slump section, and using slump 100mm as starting point, sand coarse aggregate ratio is taken as 41%, is a slump with 20mm
Section, one slump section of every raising are spent, sand coarse aggregate ratio improves 1%；
S2, the ratio of mud is determined:
The ratio of mud is determined according to cement model, when selecting 32.5 cement, the ratio of mud 0.49；When selecting 42.5 cement, water ash
Than being 0.54；When selecting 52.5 cement, the ratio of mud 0.59；
S3, gas volume V is determinedGas:
Gas volume is determined according to maximum aggregate size, and when selection maximum particle diameter is 40mm, air content 1.25% is chosen maximum
Partial size is every to reduce 1/2, and air content increases by 1 times, remaining intermediate quantity is determined by linear interpolation；
S4, water consumption is determined:
Water consumption is determined according to the slump and maximum aggregate size, and with maximum aggregate size 10mm, designing slump value 100mm is
Starting point, this hourly water consumption take 210kg/m3, when the design slump is constant, maximum aggregate size is every to increase 1 times, every cubic metre of use
Water reduces 20kg, and when maximum aggregate size is constant, the every raising 10mm of the slump, every cubic metre of water consumption improves 2.5kg；
S5, mixing time is determined:
Blender body fraction is accounted for according to configured concrete and determines mixing time, and taking volume of concrete is forced stirrer capacity
20% be starting point, mixing time is each 70s of both forward and reverse directions, and every to increase by 10%, both forward and reverse directions respectively increase 5s, and intermediate quantity is by four houses five
Enter to be set to 10% integral multiple；
S6, the volume that each component material in every cubic meter of concrete is calculated using volumetric method:
VCement=MWater/ (ratio of mud * ρCement)；
VAggregate=VAlways-VWater-VCement-VGas；
VSand= VAggregate* sand coarse aggregate ratio；
VRubble= VAggregate-VSand；
S7, it calculates each component quality and weighs configuration:
The volume of each component material in every cubic meter of concrete according to obtained in S6 calculates the quality of each component material, goes forward side by side
Row weighs, and the mixing time obtained according to S5 is stirred configuration；
S8, the practical slump of test, adjust match ratio:
The practical slump of concrete configured in test S7, since each step of above-mentioned steps has error, measured reality
There may be certain deviations for the border slump and the expected slump, if deviation is in 10mm, corresponding adjustment sand coarse aggregate ratio 0.5%；If deviation
Greater than 10mm, then by sand coarse aggregate ratio by the integral multiple of the adjustment 0.5% that rounds up of the amount of deflection；If deviation in 10mm hereinafter, if often stand
Square rice concrete water amount adjusts 1-2kg, is reconfigured, the more accurate concrete of the slump can be obtained.
Further, sand chooses the middle sand that fineness modulus is 2.6.
Further, choosing partial size is 13.5mm aggregate below.
Beneficial effects of the present invention: the present invention is only needed according to required concrete slump and current material, by step into
Row is corresponding to be calculated and configures, and the accurate concrete of the slump can be obtained, and carrying out simple adjustment can be obtained accurate slump
The concrete of degree can make full use of laboratory existing without taking into account the performances such as late strength of concrete and durability
Material effectively improves the accuracy of allocative efficiency and the slump.
Detailed description of the invention:
Fig. 1 is the flow diagram of the embodiment of the present invention.
Specific embodiment:
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
The method that the present invention provides a kind of to design according to the slump and configure laboratory flow concrete, it is only necessary to according to
The concrete slump of required configuration and existing material, by sand coarse aggregate ratio, the ratio of mud, gas volume, water consumption, stirring
Time, the selection of cement consumption and aggregate dosage, calculating and configuration obtain the accurate concrete of the slump, carry out simple
The concrete of the accurate slump can be obtained in adjustment, specifically includes the following steps:
S1, sand coarse aggregate ratio is determined:
Sand coarse aggregate ratio S% is determined according to slump section, and using slump 100mm as starting point, sand coarse aggregate ratio is taken as 41%, is a slump with 20mm
Section, one slump section of every raising are spent, sand coarse aggregate ratio improves 1%；Sand chooses the middle sand that fineness modulus is 2.6；
S2, the ratio of mud is determined:
The ratio of mud is determined according to cement model, when selecting 32.5 cement, the ratio of mud 0.49；When selecting 42.5 cement, water ash
Than being 0.54；When selecting 52.5 cement, the ratio of mud 0.59；
S3, gas volume V is determinedGas:
Gas volume is determined according to maximum aggregate size, and when selection maximum particle diameter is 40mm, air content 1.25% is chosen maximum
Partial size is every to reduce 1/2, and air content increases by 1 times, remaining intermediate quantity is determined by linear interpolation；When conditions permit, it selects
Taking partial size is 13.5mm aggregate below；
S4, water consumption is determined:
Water consumption is determined according to the slump and maximum aggregate size, and with maximum aggregate size 10mm, designing slump value 100mm is
Starting point, this hourly water consumption take 210kg/m3, when the design slump is constant, maximum aggregate size is every to increase 1 times, every cubic metre of use
Water reduces 20kg, and when maximum aggregate size is constant, the every raising 10mm of the slump, every cubic metre of water consumption improves 2.5kg；
S5, mixing time is determined:
Blender body fraction is accounted for according to configured concrete and determines mixing time, and taking volume of concrete is forced stirrer capacity
20% be starting point, mixing time is each 70s of both forward and reverse directions, and every to increase by 10%, both forward and reverse directions respectively increase 5s, and intermediate quantity is by four houses five
Enter to be set to 10% integral multiple；
S6, the volume that each component material in every cubic meter of concrete is calculated using volumetric method:
VCement=MWater/ (ratio of mud * ρCement)；
VAggregate=VAlways-VWater-VCement-VGas；
VSand= VAggregate* sand coarse aggregate ratio；
VRubble= VAggregate-VSand；
Wherein, sand coarse aggregate ratio=MSand/MAggregate, due to the similar density of sand and rubble, in the methods of the invention, according to sand coarse aggregate ratio=VSand/
VAggregateCalculating can obtain better effects.
S7, it calculates each component quality and weighs configuration:
The volume of each component material in every cubic meter of concrete according to obtained in S6 calculates the quality of each component material, goes forward side by side
Row weighs, and the mixing time obtained according to S5 is stirred configuration；
S8, the practical slump of test, adjust match ratio:
The practical slump of concrete configured in test S7, since each step of above-mentioned steps has error, measured reality
There may be certain deviations for the border slump and the expected slump, if deviation is in 10mm, corresponding adjustment sand coarse aggregate ratio 0.5%；If deviation
Greater than 10mm, then by the integral multiple of sand coarse aggregate ratio round off adjustment 0.5%；If deviation in 10mm hereinafter, if every cubic meter of concrete
Water consumption adjusts 1-2kg, is reconfigured, the more accurate concrete of the slump can be obtained.
Embodiment 1
To carry out concrete slump check experiment, the slump to be configured is the fluidity concrete of 140mm, current material are as follows:
42.5 ordinary portland cements, maximum particle diameter are the rubble of 20mm, clean river sand, and the capacity of laboratory forced mixer is
50L carries out a slump check experiment and about needs 0.012m3Concrete, the method provided according to the present invention, mix calculation
Process is as follows:
S1, due to design the slump be 140mm, therefore take sand coarse aggregate ratio be 43%, choose fineness modulus be about 2.6 middle sand；
S2, the concrete according to provided by laboratory are 42.5 types, ratio of mud w/c=0.54；
S3, the maximum particle of crushed stone according to provided by laboratory are 20mm, take concrete 's air-containing VGas=2.5%；
S4, according to the maximum particle of crushed stone and design the slump, determine every cubic meter of concrete water consumption be 210-20+2.5*4=
200kg；
S5, due to required volume of concrete be about the 20% of forced stirrer, thus take mixing time be clockwise, counterclockwise each 70
Second；
S6, the volume that each component material in every cubic meter of concrete is calculated according to volumetric method:
The density of cement: ρCement=3.15kg/L；
Cement volume in every cubic meter of concrete: VCement= MWater/ (ratio of mud * ρCement)=200/(0.54*3.15)=117L；
Aggregate volume in every cubic meter of concrete: VAggregate= VAlways-VWater-VCement-VGas=1000L-200L-117L-25=658L；
Wherein, sand volume in every cubic meter of concrete are as follows: VSand= VAggregate* sand coarse aggregate ratio=658L*43%=283L；
Every cubic meter of concrete medium stone volume are as follows: VRubble= VAggregate-VSand=658L-283L=375L；
Wherein, sand coarse aggregate ratio=MSand/MAggregate, due to the similar density of sand and rubble, in the methods of the invention, according to sand coarse aggregate ratio=VSand/
VAggregateCalculating can obtain better effects.
S7,0.012m is calculated3The quality of each component material and configuration is weighed in concrete:
Wherein, sand density pSand=2.6kg/L, rubble density pRubble=2.76kg/L；
Weigh cement quality mCement=117*3.15*0.012=4.44kg；
Weigh sand quality mSand=283*2.6*0.012=8.83kg；
Weigh rubble quality mRubble=375*2.76*0.012=12.42kg；
Weigh water mWater=200*1*0.012=2.4kg；
Both forward and reverse directions respectively stir 70s in forced stirrer.
S8, measurement simultaneously adjust:
The practical slump of the concrete configured is measured according to standard operation method, measures practical slump 145mm, then will
Water consumption is adjusted to 2.38kg in S7, is reconfigured according to the method described above, can be obtained the slump close to 140mm concrete.
Embodiment 2
To carry out concrete slump check experiment, the slump to be configured is the fluidity concrete of 120mm, current material are as follows:
32.5 ordinary portland cements, maximum particle diameter are the rubble of 40mm, clean river sand, and the capacity of laboratory forced mixer is
50L carries out a slump check experiment and about needs 0.016m3Concrete, the method provided according to the present invention, mix calculation
Process is as follows:
S1, due to design the slump be 120mm, therefore take sand coarse aggregate ratio be 42%, choose fineness modulus be about 2.6 middle sand；
S2, the concrete according to provided by laboratory are 42.5 types, ratio of mud w/c=0.49；
S3, the maximum particle of crushed stone according to provided by laboratory are 40mm, take concrete 's air-containing VGas=1.25%；
S4, according to the maximum particle of crushed stone and design the slump, determine every cubic meter of concrete water consumption be 210-20*2+2.5*2=
175kg；
S5, due to required volume of concrete be about the 30% of forced stirrer, thus take mixing time be clockwise, counterclockwise each 75
Second；
S6, the volume that each component material in every cubic meter of concrete is calculated according to volumetric method:
The density of cement: ρCement=3.15kg/L；
Cement volume in every cubic meter of concrete: VCement= MWater/ (ratio of mud * ρCement)=175/(0.49*3.15)=113L；
Aggregate volume in every cubic meter of concrete: VAggregate= VAlways-VWater-VCement-VGas=1000L-175L-113L-12.5L=700L；
Wherein, sand volume in every cubic meter of concrete are as follows: VSand= VAggregate* sand coarse aggregate ratio=700L*42%=294L；
Every cubic meter of concrete medium stone volume are as follows: VRubble= VAggregate-VSand=700L-294L=406L。
S7,0.016m is calculated3The quality of each component material and configuration is weighed in concrete:
Wherein, sand density pSand=2.6kg/L, rubble density pRubble=2.76kg/L；
Weigh cement quality mCement=113*3.15*0.016=5.69kg；
Weigh sand quality mSand=294*2.6*0.016=12.23kg；
Weigh rubble quality mRubble=406*2.76*0.016=17.93kg；
Weigh water mWater=175*1*0.016=2.8kg；
Both forward and reverse directions respectively stir 75s in forced stirrer.
S8, measurement simultaneously adjust:
The practical slump of the concrete configured is measured according to standard operation method, measures practical slump 115mm, then will
Water consumption is adjusted to 2.82kg in S7, is reconfigured according to the method described above, can be obtained the slump close to 120mm concrete.
The rest may be inferred for other embodiments related data, is calculated and is configured according to the above calculation method, do not do herein into
One step repeats.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention, it is noted that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (4)
1. a kind of method designed according to the slump and configure laboratory flow concrete, which is characterized in that only need according to institute
The concrete slump and existing material needed to configure, when by sand coarse aggregate ratio, the ratio of mud, gas volume, water consumption, stirring
Between, selection, calculating and the configuration of cement consumption and aggregate dosage, obtain the accurate concrete of the slump, simply adjusted
The whole concrete that the accurate slump can be obtained.
2. the method according to claim 1 designed according to the slump and configure laboratory flow concrete, feature
It is, specifically includes the following steps:
S1, sand coarse aggregate ratio is determined:
Sand coarse aggregate ratio S% is determined according to slump section, and using slump 100mm as starting point, sand coarse aggregate ratio is taken as 41%, is a slump with 20mm
Section, one slump section of every raising are spent, sand coarse aggregate ratio improves 1%；
S2, the ratio of mud is determined:
The ratio of mud is determined according to cement model, when selecting 32.5 cement, the ratio of mud 0.49；When selecting 42.5 cement, water ash
Than being 0.54；When selecting 52.5 cement, the ratio of mud 0.59；
S3, gas volume V is determinedGas:
Gas volume is determined according to maximum aggregate size, and when selection maximum particle diameter is 40mm, air content 1.25% is chosen maximum
Partial size is every to reduce 1/2, and air content increases by 1 times, remaining intermediate quantity is determined by linear interpolation；
S4, water consumption is determined:
Water consumption is determined according to the slump and maximum aggregate size, and with maximum aggregate size 10mm, designing slump value 100mm is
Starting point, this hourly water consumption take 210kg/m3, when the design slump is constant, maximum aggregate size is every to increase 1 times, every cubic metre of use
Water reduces 20kg, and when maximum aggregate size is constant, the every raising 10mm of the slump, every cubic metre of water consumption improves 2.5kg；
S5, mixing time is determined:
Blender body fraction is accounted for according to configured concrete and determines mixing time, and taking volume of concrete is forced stirrer capacity
20% be starting point, mixing time is each 70s of both forward and reverse directions, and every to increase by 10%, both forward and reverse directions respectively increase 5s, and intermediate quantity is by four houses five
Enter to be set to 10% integral multiple；
S6, the volume that each component material in every cubic meter of concrete is calculated using volumetric method:
VCement=MWater/ (ratio of mud * ρCement)；
VAggregate=VAlways-VWater-VCement-VGas；
VSand= VAggregate* sand coarse aggregate ratio；
VRubble= VAggregate-VSand；
S7, it calculates each component quality and weighs configuration:
The volume of each component material in every cubic meter of concrete according to obtained in S6 calculates the quality of each component material, goes forward side by side
Row weighs, and the mixing time obtained according to S5 is stirred configuration；
S8, the practical slump of test, adjust match ratio:
The practical slump of concrete configured in test S7, since each step of above-mentioned steps has error, measured reality
There may be certain deviations for the border slump and the expected slump, if deviation is in 10mm, corresponding adjustment sand coarse aggregate ratio 0.5%；If deviation
Greater than 10mm, then by sand coarse aggregate ratio by the amount of deflection round up adjustment 0.5% integral multiple；If deviation in 10mm hereinafter, if every cube
Rice concrete water amount adjusts 1-2kg, is reconfigured, the more accurate concrete of the slump can be obtained.
3. the method according to claim 2 designed according to the slump and configure laboratory flow concrete, feature
It is, sand chooses the middle sand that fineness modulus is 2.6.
4. the method according to claim 2 designed according to the slump and configure laboratory flow concrete, feature
It is, selection partial size is 13.5mm aggregate below.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521759A (en) * | 2020-04-24 | 2020-08-11 | 中国建材检验认证集团贵州有限公司 | Method for measuring water consumption of concrete test benchmark |
| CN114516742A (en) * | 2022-02-25 | 2022-05-20 | 中铁二十三局集团轨道交通工程有限公司 | Concrete mixing proportion selection method doped with gel reducer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105036626A (en) * | 2015-07-20 | 2015-11-11 | 山西四建集团有限公司 | Multi-factor parameter method for designing high-performance concrete |
| CN108818924A (en) * | 2018-06-07 | 2018-11-16 | 中铁二局第工程有限公司 | A kind of preparation method mixing sand concrete |
-
2019
- 2019-06-18 CN CN201910526496.9A patent/CN110181686A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105036626A (en) * | 2015-07-20 | 2015-11-11 | 山西四建集团有限公司 | Multi-factor parameter method for designing high-performance concrete |
| CN108818924A (en) * | 2018-06-07 | 2018-11-16 | 中铁二局第工程有限公司 | A kind of preparation method mixing sand concrete |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521759A (en) * | 2020-04-24 | 2020-08-11 | 中国建材检验认证集团贵州有限公司 | Method for measuring water consumption of concrete test benchmark |
| CN114516742A (en) * | 2022-02-25 | 2022-05-20 | 中铁二十三局集团轨道交通工程有限公司 | Concrete mixing proportion selection method doped with gel reducer |
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Application publication date: 20190830 |