CN102621037A - Method for testing particle packing density of concrete used powder - Google Patents
Method for testing particle packing density of concrete used powder Download PDFInfo
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- CN102621037A CN102621037A CN2012100720982A CN201210072098A CN102621037A CN 102621037 A CN102621037 A CN 102621037A CN 2012100720982 A CN2012100720982 A CN 2012100720982A CN 201210072098 A CN201210072098 A CN 201210072098A CN 102621037 A CN102621037 A CN 102621037A
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Abstract
The invention provides a method for testing the particle packing density of concrete used powder, and the tight particle packing density degree of the concrete used powder can be tested through the ratio of the absolute volume of the mixing powder and the packing volume of powder in slurry. The method provided by the invention is simple to operate, scientific, and closer to the practical application condition, and can provide better guidance for the mix design of concrete.
Description
Technical field
The present invention relates to the tightly packed technical field of powder granule, be specifically related to the method for testing of a kind of concrete with the particle packing packing of powder.
Background technology
Amount of literature data shows that the packing of the grain composition of optimizing cement and admixture, raising concrete system can significantly improve concrete intensity, and the endurance quality of each side.At present, the model and the theory that have had the tightly packed of multiple powder and grain composition aspect.
Furans thinks and when granule is inserted oarse-grained gap just, just forms closestpacking; If the particle of 3 kinds of sizes is arranged; In particle should insert just in the coarse grained gap, during fine grained is inserted, coarse grained space, and can spread to the situation of multiple particle thus.Westman and Hugill think that when the intergranular size ratio of thickness was enough big, have to draw a conclusion: the first, when forming near 100% coarse particle, the apparent volume of potpourri was determined that by coarse particle fine grained is inserted coarse grained space, does not occupy volume; The second, when forming near 100% fine grained, fine grained forms pore and around coarse particle, the apparent volume of potpourri is fine grain apparent volume and coarse particle actual volume sum.
Though it is numerous about closelypacked theory; But how the test concrete is a difficult problem with the particle packing packing of powder in actual production, because powder granule is difficult to arrange according to the pattern of theory, fills each other; And arrange in a jumble at random often; Because the friction force between electrostatic drag and the powder granule etc., the stacking volume of dry powder is bigger, and the stacking volume of the dry powder body that obtains after through ram-jolt repeatedly is still greater than the volume of its slurry under low water binder ratio; Therefore, only utilize the grain composition of the accumulation packing test powder of dry powder body to be inaccurate.In addition, every kind of powder all has certain characteristic, and its water requirement, grain pattern, auxiliary water-reducing effect etc. respectively has difference, its fluidity to slurry that certain influence all can be arranged, and therefore, utilizes the grain composition of fluidity size test powder of slurry also improper.
Because the slurry volume under the low water binder ratio is significantly less than the ram-jolt volume of equal powder in the slurry; Therefore explain that the tightly packed degree of powder granule in slurry is superior to the dry powder body, consider to adopt the accumulation packing of slurry method test powder more to level off to the closelypacked natural form of powder granule.And fresh concrete itself is a kind of slurry state, utilizes the accumulation packing of its powder of slurry method test to have more science.
Summary of the invention
For overcoming above deficiency, the invention provides a kind of simple to operate, more near practical situations, can be concrete mixture ratio design the method for testing of the concrete of better guidance with the particle packing packing of powder be provided.
The present invention solves the problems of the technologies described above the technical scheme of being taked to be:
A kind of concrete is characterized in that with the method for testing of the particle packing packing of powder it may further comprise the steps:
Have N kind powder component in the concrete mix, record the density p of said each powder respectively
1, ρ
2, ρ
3ρ
n
According to above-described N kind powder design of components proportioning, and take by weighing the quality m of said powder according to proportioning
1, m
2, m
3M
n, utilize batch mixer that it is mixed, obtain composite granule;
Calculate the absolute volume V of the above-mentioned composite granule of unit mass
0=(m
1/ ρ
1+ m
2/ ρ
2+ m
3/ ρ
3+ ... + m
n/ ρ
n)/(m
1+ m
2+ m
3+ ... M
n);
With said composite granule and water, polycarboxylate water-reducer, foam-breaking agent, and the retardant mix become slurry; Stir, wherein, water-cement ratio is 0.15 ~ 0.20; The addition content of said polycarboxylate water-reducer is 0.5 ~ 3% of a said composite granule quality; The addition content of said foam-breaking agent is 0.05 ~ 0.1% of a said polycarboxylate water-reducer quality, and the addition content of said retardant is 1 ~ 2% of a said polycarboxylate water-reducer quality, calculates composite granule shared mass percent λ in slurry with this;
Said slurry is poured in the container, and ram-jolt is until filling up said container;
The mass M of the slurry in the measuring vessel and the volume V of container;
Calculate the quality m=M * λ of composite granule in the container, then the stacking volume V of unit mass composite granule in the slurry
1=V/m;
The particle packing packing of said composite granule is designated as φ, i.e. φ=V
0/ V
1* 100%.
In the such scheme; The addition content of said polycarboxylate water-reducer is 0.5 ~ 3% of a said composite granule quality; The addition content of said foam-breaking agent is 0.05 ~ 0.1% of a said polycarboxylate water-reducer quality, and the addition content of said retardant is 1 ~ 3% of a said polycarboxylate water-reducer quality.
In the such scheme, when said composite granule mix becomes slurry, when slurry has flowability, begin to stir 10 minutes fast, after stirring finishes, left standstill 5 minutes.
In the such scheme, the step that said slurry is poured in the container is: pour a part of slurry into to container, a part of slurry is poured in ram-jolt again into, and ram-jolt again repeats repeatedly like this, until container is filled up.
In the such scheme, the step of said ram-jolt is: container is not less than artificial ram-jolt on the books of 10mm at thickness, container is mentioned highly for about 40mm, and frequency is 1 time/second, ram-jolt 60 times.
In the such scheme, said slurry fluidity is in 240 ~ 300mm scope, and the described slurry presetting period is not less than 18 hours.
The invention has the beneficial effects as follows: this method of testing is simple to operate, more near the practical situations of concrete with powder, can be the concrete mixture ratio design better guidance is provided.
Description of drawings
Fig. 1 pours the synoptic diagram of container into for slurry.
Among the figure, 1-funnel, 2-iron stand, 3-slurry, 4-conical flask.
Embodiment
The present invention provides the method for testing of a kind of concrete with the particle packing packing of powder, and it may further comprise the steps:
Have N kind powder component in the concrete mix, record the density p of said each powder respectively
1, ρ
2, ρ
3ρ
n
According to above-described N kind powder design of components proportioning, and take by weighing the quality m of said powder according to proportioning
1, m
2, m
3M
n, utilize batch mixer that it is mixed, obtain composite granule;
Calculate the absolute volume V of the above-mentioned composite granule of unit mass
0=(m
1/ ρ
1+ m
2/ ρ
2+ m
3/ ρ
3+ ... + m
n/ ρ
n)/(m
1+ m
2+ m
3+ ... M
n);
With said composite granule and water, polycarboxylate water-reducer, foam-breaking agent, and the retardant mix become slurry;, slurry begins to stir 10 minutes fast when having flowability; After stirring finishes, left standstill 5 minutes, said slurry fluidity is in 240 ~ 300mm scope; Workability is good, and the described slurry presetting period is not less than 18 hours.Wherein, Water-cement ratio is 0.15 ~ 0.20; The addition content of said polycarboxylate water-reducer is 0.5 ~ 3% of a said composite granule quality; The addition content of said foam-breaking agent is 0.05 ~ 0.1% of a said polycarboxylate water-reducer quality, and the addition content of said retardant is 1 ~ 3% of a said polycarboxylate water-reducer quality, calculates composite granule shared mass percent λ in slurry with this;
Said slurry is poured in the container, and ram-jolt is until filling up said container;
The mass M of the slurry in the measuring vessel and the volume V of container;
Calculate the quality m=M * λ of composite granule in the container, then the stacking volume V of unit mass composite granule in the slurry
1=V/m;
The particle packing packing of said composite granule is designated as φ, i.e. φ=V
0/ V
1* 100%.
The density measurement of each powder is to measure with reference to GB GB/T 208-94.
Said slurry is poured in the container, ram-jolt, following until the concrete steps of filling up said container:
As shown in Figure 1, container is selected conical flask for use.Conical flask 4 is placed iron stand 2 times, place a funnel 1 on the iron stand 2, vertically over against conical flask 4 bottleneck centers, the funnel end opening is higher than the horizontal level of conical flask 4 bottlenecks to funnel 1 neck, and slurry is vertically flowed in the conical flask 4 by funnel 1.Pour a part of slurry into to container, a part of slurry is poured in ram-jolt again into, and ram-jolt again repeats repeatedly like this, and for example three times, until container is filled up.The method of ram-jolt is: conical flask 4 is not less than artificial ram-jolt on the books of 10mm at thickness, and conical flask is mentioned highly for about 40mm, and frequency is 1 time/second, ram-jolt 60 times.
The assay method of the mass M of the slurry in the container is following:
Said slurry is poured in the conical flask 4, filled, use doctor blade, covering bottleneck with glass sheet does not have bubble, cleans the slurry that conical flask 4 outsides are adhered to dry wipe, its quality of weighing a.Wherein the gross mass of conical flask 4 and glass sheet is b.Then a-b is the mass M of the slurry in the container.
Below describe with powder with concrete concrete:
Embodiment 1
Take by weighing the powder that gross mass is 1200g according to following proportioning (mass ratio), mix, the preparation cement slurry:
A cement: microballon: agstone: silicon ash=3: 3: 3.5: 0.5
B cement: microballon: agstone: silicon ash=7: 1: 1.5: 0.5
Water-cement ratio σ is 0.15, and water reducer is high-efficiency water-reducing agent of poly-carboxylic acid (solid content 20.2%), and volume is 20g; Foam-breaking agent (type siloxane) 0.016g; Retardant (gluconic acid sodium salt) 0.6g; Test ambient temperature is 20 ℃.Can calculate, dry powder physique amount accounts for the ratio of slurry gross mass among slurry a, the b:
λ=1200/(1200+1200×0.15+20+0.016+0.6)=?0.856766。
A large amount of tests show that when the above-mentioned additive of admixture, the presetting period of slurry is all greater than 18 hours.
The density that obtains each powder according to GB GB/T 208-94 actual measurement is as shown in table 1.
Density (the g/cm of table 1 test powder
3)
| Powder | Cement | Microballon | Agstone | The silicon ash |
| Density | 3.09 | 2.60 | 2.87 | 2.28 |
Utilize V
0=(m
1/ ρ
1+ m
2/ ρ
2+ m
3/ ρ
3+ ... + m
n/ ρ
n)/(m
1+ m
2+ m
3+ ... M
n), the absolute volume that calculates every kilogram of composite granule a is V
0a=356.353 cm
3, the absolute volume of every kilogram of composite granule b is V
0b=339.193 cm
3
With a, when b composite granule mix becomes slurry,, slurry begins to stir 10 minutes fast continuously again when having flowability, after stirring finishes; Left standstill 5 minutes; Detect its fluidity respectively, the fluidity of a mix slurry is 285mm, and the fluidity of b mix slurry is 278mm; The workability of slurry is good, no excreting water phenomenon.
Slurry divided respectively pours into for 3 times in the conical flask (total measurement (volume) v is 327.4ml), whenever pour into once after with the artificial ram-jolt of conical flask.After slurry is filled, use doctor blade, covering bottleneck with glass sheet does not have bubble, cleans the slurry that the conical flask outside is adhered to dry wipe, the gross mass M of weighing conical flask, slurry and glass sheet
a=911.12g, M
b=923.28g.
The gross mass M of conical flask and glass sheet
1=211.30g.
The actual mass that can obtain dry powder body in the conical flask according to the test proportioning is respectively:
(M
a-M
1)λ=(911.12-211.30)×0.856766=599.582g
(M
b-M
1)λ=(923.28-211.30)×0.856766=610.0003g
The stacking volume V of every kilogram of dry powder body a in the slurry
1a=1000v/ (M
a-M
1) λ=545.38cm
3
The stacking volume V of every kilogram of dry powder body a in the slurry
1b=1000v/ (M
b-M
1) λ=536.065 cm
3
The particle packing packing φ of composite granule a
a=V
0a/ V
1a* 100%=65.340%;
The particle packing packing φ of composite granule b
b=V
0b/ V
1b* 100%=63.275%;
Can know φ by above-mentioned test figure
a＞φ
b, explain that the particle packing packing of composite granule a is more excellent.Therefore, under identical powder component situation, select proportioning 7: 1: 1.5: 0.5, with the grain composition that more helps optimizing cement and admixture, improve concrete intensity.
Below test is carried out according to the method among the embodiment 1:
Take by weighing the powder that gross mass is 1200g according to following proportioning, mix, the preparation cement slurry:
A cement: flyash=5: 5
B cement: breeze: flyash=5: 2: 3
C cement: microballon: silicon ash=5: 4: 1
D cement: microballon: agstone: silicon ash=3: 3: 3.5: 0.5
E cement: microballon: agstone: silicon ash=7: 1: 1.5: 0.5
Water-cement ratio σ is 0.20, and water reducer is high-efficiency water-reducing agent of poly-carboxylic acid (solid content 20.2%), and volume is 16g; Foam-breaking agent (type siloxane) 0.016g; Retardant (gluconic acid sodium salt) 0.48g; Test ambient temperature is 20 ℃.A large amount of tests show that when the above-mentioned additive of admixture, the presetting period of slurry is all greater than 18 hours.
Table 2 has been listed from the V of A to E component
0, V
1, and the result of calculation of φ (density of breeze is 2.89g/cm
3, the density of flyash is 2.34g/cm
3).
Table 2
| Group | V 0/(cm 3) | V 1/(cm 3) | φ/% |
| A | 361.812 | 623.997 | 57.983% |
| B | 351.499 | 587.041 | 59.876% |
| C | 359.518 | 544.551 | 66.021% |
| D | 356.353 | 551.443 | 64.622% |
| E | 339.193 | 543.134 | 62.451% |
Above-mentioned V
0Absolute volume for every kilogram of powder; V
1Stacking volume for every kilogram of powder in the slurry; φ is the particle packing packing of powder.
Can know φ by above-mentioned test figure
CMaximum explains that the particle packing packing of composite granule C component is more excellent.Therefore, under the situation of above multiple powder component and proportioning, the grain composition of C group cement and admixture is more excellent.
Claims (6)
1. a concrete is characterized in that with the method for testing of the particle packing packing of powder it may further comprise the steps:
Have N kind powder component in the concrete mix, record the density p of said each powder respectively
1, ρ
2, ρ
3ρ
n
According to above-described N kind powder design of components proportioning, and take by weighing the quality m of said powder according to proportioning
1, m
2, m
3M
n, utilize batch mixer that it is mixed, obtain composite granule;
Calculate the absolute volume V of the above-mentioned composite granule of unit mass
0=(m
1/ ρ
1+ m
2/ ρ
2+ m
3/ ρ
3+ ... + m
n/ ρ
n)/(m
1+ m
2+ m
3+ ... M
n);
With said composite granule and water, polycarboxylate water-reducer, foam-breaking agent, and the retardant mix become slurry, stir, wherein, water-cement ratio is 0.15 ~ 0.20, calculates composite granule shared mass percent λ in slurry thus;
Said slurry is poured in the container, and ram-jolt is until filling up said container;
The mass M of the slurry in the measuring vessel and the volume V of container;
Calculate the quality m=M * λ of composite granule in the container, then the stacking volume V of unit mass composite granule in the slurry
1=V/m;
The particle packing packing of said composite granule is designated as φ, i.e. φ=V
0/ V
1* 100%.
2. the method for testing of particle packing packing according to claim 1; It is characterized in that; The addition content of said polycarboxylate water-reducer is 0.5 ~ 3% of a said composite granule quality; The addition content of said foam-breaking agent is 0.05 ~ 0.1% of a said polycarboxylate water-reducer quality, and the addition content of said retardant is 1 ~ 3% of a said polycarboxylate water-reducer quality.
3. the method for testing of particle packing packing according to claim 1 is characterized in that, when said composite granule mix becomes slurry, when slurry has flowability, begins to stir 10 minutes fast, after stirring finishes, leaves standstill 5 minutes.
4. the method for testing of particle packing packing according to claim 1 is characterized in that, the step that said slurry is poured in the container is: pour a part of slurry into to container; Ram-jolt is poured a part of slurry into, again ram-jolt again; Repeat so repeatedly, until container is filled up.
5. according to the method for testing of claim 1 or 4 described particle packing packings, it is characterized in that the step of said ram-jolt is: container is not less than ram-jolt on the books of 10mm at thickness, container is mentioned highly for about 40mm, and frequency is 1 time/second, ram-jolt 60 times.
6. the method for testing of particle packing packing according to claim 1 is characterized in that, said slurry fluidity is in 240 ~ 300mm scope, and the described slurry presetting period is not less than 18 hours.
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| CN103833251A (en) * | 2014-02-28 | 2014-06-04 | 华新混凝土有限公司 | Inorganic additive of adjusting strength and viscosity of super-high-strength concrete |
| CN106769649A (en) * | 2016-12-14 | 2017-05-31 | 河南理工大学 | A kind of assay method of wet type prose style free from parallelism bulk density and void ratio |
| CN107192637A (en) * | 2017-06-30 | 2017-09-22 | 华南理工大学 | A kind of method for determining full recycled fine aggregate and the tightly packed optical sand percentage of stone |
| CN110261264A (en) * | 2019-06-18 | 2019-09-20 | 东南大学 | A kind of simulation experiment method of clear-water concrete |
| CN112798463A (en) * | 2021-02-24 | 2021-05-14 | 中铁六局集团有限公司 | Test method for determining solid density of slurry |
| CN113504149A (en) * | 2021-07-22 | 2021-10-15 | 东南大学 | Micron-sized particle stacking compactness testing device and testing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102818745A (en) * | 2012-08-03 | 2012-12-12 | 中建商品混凝土天津有限公司 | Device and method for testing powder bulk density |
| CN103833251A (en) * | 2014-02-28 | 2014-06-04 | 华新混凝土有限公司 | Inorganic additive of adjusting strength and viscosity of super-high-strength concrete |
| CN106769649A (en) * | 2016-12-14 | 2017-05-31 | 河南理工大学 | A kind of assay method of wet type prose style free from parallelism bulk density and void ratio |
| CN107192637A (en) * | 2017-06-30 | 2017-09-22 | 华南理工大学 | A kind of method for determining full recycled fine aggregate and the tightly packed optical sand percentage of stone |
| CN110261264A (en) * | 2019-06-18 | 2019-09-20 | 东南大学 | A kind of simulation experiment method of clear-water concrete |
| CN110261264B (en) * | 2019-06-18 | 2022-04-08 | 东南大学 | Simulation test method for fair-faced concrete |
| CN112798463A (en) * | 2021-02-24 | 2021-05-14 | 中铁六局集团有限公司 | Test method for determining solid density of slurry |
| CN113504149A (en) * | 2021-07-22 | 2021-10-15 | 东南大学 | Micron-sized particle stacking compactness testing device and testing method thereof |
| CN113504149B (en) * | 2021-07-22 | 2023-09-01 | 东南大学 | Micron-sized particle stacking compactness testing device and testing method thereof |
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