CN102353617A - Cement paste fluidity test device with high precision and high sensitivity and test method - Google Patents
Cement paste fluidity test device with high precision and high sensitivity and test method Download PDFInfo
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- CN102353617A CN102353617A CN201110271290XA CN201110271290A CN102353617A CN 102353617 A CN102353617 A CN 102353617A CN 201110271290X A CN201110271290X A CN 201110271290XA CN 201110271290 A CN201110271290 A CN 201110271290A CN 102353617 A CN102353617 A CN 102353617A
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Abstract
The invention relates to a cement paste fluidity test device and a test method. The device consists of an iron stand, an H pipe, a pipe plug and a measuring cylinder, wherein the H pipe is fixed on a fixture of the iron stand; a paste outlet of the H pipe is sealed by the pipe plug; and the measuring cylinder is arranged below the paste outlet of the H pipe so that the central axis of the H pipe is superposed with the central axis of the measuring cylinder. The test method comprises the following steps of: 1) weighing the cement, weighing water and additives according to the experiment mix proportion, and stirring the neat cement paste; 2) testing the paste fluidity of the neat cement paste; 3) selecting the H pipe according to the paste fluidity of the neat cement paste, sealing the paste outlet with the pipe plug, and fixing the H pipe on the iron stand; and 4) quickly filling the H pipe with the neat cement paste, and removing the pipe plug while starting the timing to record the flowing time of 50 mL and 100 mL of the paste. Through the test method provided by the invention, the paste fluidity change caused by various reasons can be accurately measured; and the method has high sensitivity and wide test range, and is easy to operate and susceptible to few influence factors.
Description
Technical field
The present invention relates to a kind of high precision and high-sensitivity cement thick liquid flowability proving installation and method of testing.
Background technology
The development of high performance concrete makes concrete technology that great change take place; From pursuing the high strength design transition simply to paying attention to durability Design; Make high performance concrete match ratio design differ from design of common concrete proportioning, outstanding behaviours is the widely-used of mineral additive and chemical admixture.Coarse aggregate and fine aggregate are mainly played the part of the role that physics is filled in the concrete; No chemical change; Thereby additive changes rheological property of concrete through the rheological of control concrete mortar, so the Binder Materials slurry rheology can characterize the rheological property of concrete characteristic indirectly.
High performance concrete waits through admixture 1 ~ 2 ‰ volume high efficiency water reducing agents and flyash, breeze and reduces water cement ratio; Improve concrete density and permanance; And through adding thickening agent assurance concrete education resistance and reinforcing bar handling capacity; Therefore; The ratio that chemical admixture volume subtle change and mineral additive account for cementitious material system will change fluidity of slurry and have an immense impact on, and how accurately characterize the fluidity of slurry subtle change mix Design and additive the optimum mix amount are judged to have guiding significance.
The method of judging cement thick liquid flowability at present mainly contains clean slurry fluidity method (GB/T 8007-2000 " concrete admixture homogenieity test method ") and Marsh tube method (JC/ 1083-2088 " cement and water reducer compatibility test method "), also can use methods such as rotational viscosimeter under the few cases.Use truncated cone circle mould (back cut diameter 36mm, lower port diameter 60mm highly are 60mm, the jointless metallic article of inner wall smooth) in the flowing degree of net paste of cement method.The flowing degree of net paste of cement method is used comparatively general, and measurement range is narrow, the not high shortcoming of precision but in actual mechanical process, exist.Especially for the clean slurry of high fluidity, the cement slurry excreting water phenomenon is to the measurement serious interference of flow diameter, and when its diameter surpassed 280mm, the reference value of data was lower; When the water reducer volume was done subtle change, flowing degree of net paste of cement can not in time be made a response, and caused measuring accuracy not enough owing to operate miss when mobility variations is small; In addition, the wetness degree of glass plate is measured influence greatly to divergence, often causes hydrosphere occurring around the slurry or circularity is not enough, influences the measurement of cement slurry flow diameter.
Marsh tube method is more simple than the operation of flowing degree of net paste of cement method, good reproducibility, and sensitivity is higher, is confirmed by a large amount of scientific research personnel.But,, had a strong impact on its test specification to the different viscosities slurry because its outlet diameter is single; Be embodied in: for admixture thickening agent or the very little cement slurry of water cement ratio; Its viscosity is higher, can't the rheological of cement slurry can't be described through the feed opening of Marsh tube; For the low-down cement slurry of viscosity,, change insensitive to water cement ratio subtle change and the small volume of additive because its flow velocity is very fast.
Summary of the invention
The present invention proposes a kind of high precision and high-sensitivity cement thick liquid flowability proving installation and method of testing for the technical matters that solves above-mentioned prior art existence; Remedy current experimental apparatus and method to the cement slurry measurement range narrow with problems such as sensitivity is not high, satisfy the needs that solve practical problems.
The technical scheme that technical matters adopted that the present invention solves above-mentioned prior art existence is: a kind of high precision and high-sensitivity cement thick liquid flowability proving installation; It is characterized in that being made up of iron stand, H pipe, pipe close and graduated cylinder, the H pipe is fixed on the anchor clamps of iron stand, and the grout outlet of H pipe is sealed by pipe close; Graduated cylinder places the grout outlet below of H pipe; H pipe axis is overlapped with the graduated cylinder axis, and described H pipe is made up of storage slurry vertical tube, reducing and grout outlet, and the internal diameter of its storage slurry vertical tube is 33 ± 0.5mm; Highly be 200 ± 0.5mm; Long 20 ± the 0.5mm of its reducing, the internal diameter of the grout outlet of its grout outlet is 4 ± 0.1mm, 6 ± 0.1mm, 8 ± 0.1mm or 12 ± 0.1mm, pulp pipe range 15 ± 0.5mm.
Press such scheme, the range of graduated cylinder is 250mL, and scale division value is 2mL, and the diameter of graduated cylinder is 40 ± 0.5mm.
Press such scheme, H pipe and graduated cylinder are glass or transparent organic material.
The method of testing of high precision of the present invention and high-sensitivity cement thick liquid flowability proving installation is characterized in that including following steps:
1) takes by weighing an amount of cement, take by weighing water consumption and add dosage, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine " by the test match ratio;
2) according to the regulation among the GB/T 8007-2000 " concrete admixture homogenieity test method ", testing procedure 1) the slurry fluidity of gained cement paste;
3) according to step 2) the slurry fluidity of each cement paste of test gained, choose the H pipe of different pulp bores, seal grout outlet with pipe close, and the H pipe is fixed on the iron stand;
4) step 1) gained cement paste being filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close, is the flowability of 50mL and used time of 100mL judging cement paste through record slurry stream lower volume.
Ultimate principle of the present invention: as far as same slurry, if select H pipe grout outlet internal diameter excessive, the slurry flowing velocity is fast, otherwise the slurry flowing velocity is slow.Therefore, different H pipes can precisely be tested for a certain fluidity scope slurry.Through preliminary test slurry fluidity, judge the fluidity of slurry size, select the H pipe according to the fluidity of slurry size then, further fluidity of slurry is precisely tested, thereby its precision and sensitivity measure can obtain reliable guarantee.
Method of testing of the present invention, different pulp caliber H pipes are accurately measured corresponding to certain fluidity scope fluidity of slurry, and its characteristic corresponding relation is:
When the fluidity D of described cement paste >=360mm, the internal diameter of grout outlet of choosing the grout outlet of H pipe is 4 ± 0.1mm;
When the fluidity of described cement paste was 290≤D＜360mm, the internal diameter of grout outlet of choosing the grout outlet of H pipe was 6 ± 0.1mm;
When the fluidity of described cement paste was 220≤D＜290mm, the internal diameter of grout outlet of choosing the grout outlet of H pipe was 8 ± 0.1mm;
As the fluidity D＜220mm of described cement paste or when not having fluidity, the internal diameter of grout outlet of choosing the grout outlet of H pipe is 12 ± 0.1mm.
Beneficial effect of the present invention is: method of testing of the present invention, the fluidity of slurry that can cause a variety of causes changes accurately to be measured, highly sensitive, test specification is wide, simple to operate, influence factor is few, its scope of application has:
(1) estimates water reducer and cement compatibility;
(2) judge water reducer volume saturation point;
(3) relatively the additive trace changes fluidity of slurry and viscosity influence;
This test can in time be reacted when water cement ratio and the variation of additive trace; Characteristics such as highly sensitive, that test specification is wide, simple to operate, influence factor is few; For mix Design and water reducer provide accurately method of testing easily to the cement compatibility, water reducer trace variation and high fluidity and the regional fluidity of slurry test problem of lazy flow in the slurry have been solved;
Use the size that flows to judge that fluidity of slurry (fluidity method) influence factor is more, the slurry fluidity is changed insensitive problem, the Marsh tube carries out the flowability sign with flowing time and has obtained solution; Single to Marsh tube grout outlet internal diameter, the problem that test specification is narrow, the H pipe corresponding with it according to slurry fluidity different choice through the slurry flowing time is tested, then can carry out accurate sensitive determination to different mobile slurries.Therefore, the H pipe has merged the elite of fluidity testing, has remedied the deficiency of present fluidity testing method, to solving practical problems directive significance is arranged.
Description of drawings
Fig. 1 is the structural representation of proving installation of the present invention;
Fig. 2 is the dimensional drawing of H pipe of the present invention.
Embodiment:
Below in conjunction with embodiment the present invention is described further, but not only is confined to following instance.
A kind of high precision and high-sensitivity cement thick liquid flowability proving installation are made up of iron stand 1, H pipe 2, pipe close 3 and graduated cylinder 4, and H pipe 2 is fixed on the anchor clamps of iron stand 1; The grout outlet of H pipe 2 is by pipe close 3 sealings, and graduated cylinder 4 places the grout outlet below of H pipe 2, makes H manage 2 axis and overlaps with graduated cylinder 4 axis; Described H pipe 2 is made up of storage slurry vertical tube 7, reducing 5 and grout outlet 6; The internal diameter of its storage slurry vertical tube is 33 ± 0.5mm, highly is 200 ± 0.5mm, the long 20 ± 0.5mm of its reducing; The internal diameter of the grout outlet of its grout outlet is 4 ± 0.1mm, 6 ± 0.1mm, 8 ± 0.1mm or 12 ± 0.1mm, pulp pipe range 15 ± 0.5mm.
The range of described graduated cylinder 4 is 250mL, and scale division value is 2mL, and the diameter of graduated cylinder is 40 ± 0.5mm.
Described H pipe 2 is glass or transparent organic material with graduated cylinder 4.
Embodiment 1:
(1) takes by weighing 300g cement, take by weighing water consumption and add dosage, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine " by table 1 match ratio;
(2) according to the regulation among the GB/T 8007-2000 " concrete admixture homogenieity test method ", the slurry fluidity of testing procedure (1) gained cement paste;
(3) according to slurry fluidity size, choose the H pipe, the internal diameter of the grout outlet of the grout outlet of H pipe is 4 ± 0.1mm, seals grout outlet with pipe close, and the H pipe is fixed on the iron stand;
(4) step (1) gained cement paste is filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close, record slurry stream lower volume is a flowability of 50mL and used time of 100mL judging cement paste;
(5) test findings is inserted table 1.
Table 1 H pipe and the contrast of clean slurry slump test
| Cement/g | Water/g | Water cement ratio | Water reducer/g | T50/s | T100/s | Fluidity/mm |
| 300 | 115 | 0.38 | 0.6 | 15.39 | 35.72 | 360 |
| 300 | 120 | 0.40 | 0.6 | 13.01 | 30.27 | 352 |
| 300 | 125 | 0.42 | 0.6 | 10.00 | 25.46 | 361 |
| 300 | 130 | 0.43 | 0.6 | 7.13 | 20.78 | 357 |
| 300 | 140 | 0.47 | 0.6 | 4.58 | 11.66 | 375 |
| 300 | 150 | 0.50 | 0.6 | 4.12 | 9.03 | 390 |
Can find out from test findings, at high water-cement ratio (>=0.38) interval, slurry bleeding; Fluidity increases the generation fluctuation with water consumption, and T50 and T100 then evenly reduce, and this shows; Interval at high water-cement ratio, H can more accurately characterize cement slurry to be changed with water cement ratio.
(1) takes by weighing 300g cement, take by weighing water consumption and add dosage, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine " by table 2 match ratio;
(2) according to the regulation among the GB/T 8007-2000 " concrete admixture homogenieity test method ", testing procedure 1) the slurry fluidity of gained cement paste;
(3) according to slurry fluidity size, choose the H pipe, the internal diameter of the grout outlet of the grout outlet of H pipe is 6 ± 0.1mm, seals grout outlet with pipe close, and the H pipe is fixed on the iron stand;
(4) step (1) gained cement paste is filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close, record slurry stream lower volume is a flowability of 50mL and used time of 100mL judging cement paste;
(5) test findings is inserted table 2.
Table 2 H pipe and the contrast of clean slurry slump test
| Cement/g | Water/g | Water cement ratio | Water reducer/g | T50/s | T100/s | Fluidity/mm |
| 300 | 84 | 0.28 | 0.6 | 13.68 | 29.5 | 295 |
| 300 | 87 | 0.29 | 0.6 | 12.09 | 24.78 | 290 |
| 300 | 90 | 0.30 | 0.6 | 10.87 | 22.5 | 315 |
| 300 | 93 | 0.31 | 0.6 | 9.93 | 20.81 | 310 |
| 300 | 96 | 0.32 | 0.6 | 8.78 | 18.4 | 328 |
Can find out from test findings; In water cement ratio higher (0.28 ~ 0.32) interval, the fluidity test result still produces fluctuation with the water cement ratio increase, and T50 and T100 that the H pipe records evenly reduce; This shows; Higher at water cement ratio, fluidity is during greater than 260mm, and H can more accurately characterize water cement ratio and change the influence to fluidity of slurry.
Embodiment 3:
(1) takes by weighing 300g cement, take by weighing water consumption and add dosage, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine " by table 3 match ratio;
(2) according to the regulation among the GB/T 8007-2000 " concrete admixture homogenieity test method ", testing procedure 1) the slurry fluidity of gained cement paste;
(3) according to slurry fluidity size, choose the H pipe, the internal diameter of the grout outlet of the grout outlet of H pipe is 8 ± 0.1mm, seals grout outlet with pipe close, and the H pipe is fixed on the iron stand;
(4) step (1) gained cement paste is filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close, record slurry stream lower volume is 50mL and used time of 100mL;
(5) test findings is inserted table 3.
Table 3 H pipe and the contrast of clean slurry slump test
| Cement/g | Water/g | Water cement ratio | Water reducer/g | T50/s | T100/s | Fluidity/mm |
| 300 | 75 | 0.25 | 0.6 | 7.47 | 17.81 | 220 |
| 300 | 78 | 0.26 | 0.6 | 6.41 | 14.62 | 240 |
| 300 | 81 | 0.27 | 0.6 | 5.24 | 12.6 | 261 |
| 300 | 84 | 0.28 | 0.6 | 4.84 | 11.48 | 295 |
| 300 | 87 | 0.29 | 0.6 | 4.42 | 10.76 | 289 |
Can find out from test findings, in medium water cement ratio (0.25 ~ 0.29) interval, along with water cement ratio increases; Fluidity constantly increases; T50 and T100 that this moment, the H pipe recorded evenly reduce, and this shows, when medium water cement ratio; H pipe and fluidity method all can characterize the Changing Pattern of fluidity of slurry and water cement ratio, and both can verify mutually.
Embodiment 4:
(1) takes by weighing 300g cement, 68g water and 0.6g water reducer, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine ";
(2) according to the regulation among the GB/T 8007-2000 " concrete admixture homogenieity test method ", testing procedure 1) the slurry fluidity of gained cement paste;
(3) because water cement ratio is very little, slurry viscosity is bigger, causes the cement slurry fluidity to measure.So choose the H pipe, the internal diameter of the grout outlet of the grout outlet of H pipe is 12 ± 0.1mm, seals grout outlet with pipe close, and the H pipe is fixed on the iron stand;
(4) step (1) gained cement paste is filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close, record slurry stream lower volume is 50mL and used time of 100mL.
Slurry viscosity is very big in the test, use the flowing degree of net paste of cement method and can't measure fluidity of slurry, and T50 and T100 that the H pipe records is respectively 7.68s and 13.63s; This fully proves; In the low water-cement ratio zone, under the mobile failure conditions of cement paste, the H pipe still can accurately be measured fluidity of slurry; The design of H pipe has not only improved the precision of fluidity of slurry test, has also widened the scope of fluidity of slurry test.
Embodiment 5:
(1) choose the H pipe, the internal diameter of the grout outlet of the grout outlet of H pipe is 8 ± 0.1mm, seals grout outlet with pipe close, and the H pipe is fixed on the iron stand;
(2) accurately take by weighing 300g cement, take by weighing water consumption and add dosage, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine " by table 4 match ratio;
(3) step (2) gained cement paste is filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close, record slurry stream lower volume is 50mL and used time of 100mL, is designated as T50 and T100;
(4) test findings is inserted table 4.
Table 4 H pipe is differentiated the test of water reducer saturation point
| Cement/g | Water/g | Water reducer/% | T50/s | T100/s |
| 300 | 74 | 0.16 | 24.13 | 58.04 |
| 300 | 74 | 0.18 | 17.68 | 40.32 |
| 300 | 74 | 0.20 | 7.68 | 17.43 |
| 300 | 74 | 0.22 | 6.11 | 14.05 |
| 300 | 74 | 0.24 | 5.99 | 13.66 |
| 300 | 74 | 0.26 | 5.86 | 12.94 |
| 300 | 74 | 0.28 | 5.53 | 12.22 |
| 300 | 74 | 0.30 | 5.29 | 11.5 |
Test findings shows that along with the increase of water reducer volume, T50 and T100 all reduce; But after the water reducer volume surpassed 0.20%, test result tended towards stability, and it is not obvious that fluidity of slurry increases variation with the water reducer volume; Therefore, can judge accurately that through the H pipe water reducer saturated adulterate capacity is 0.20%.
Embodiment 6:
(1) accurately take by weighing 300g cement, fixedly the water reducer volume is 0.20%, through changing water cement ratio, makes flowing degree of net paste of cement reach 300mm, writes down water cement ratio numerical value this moment;
(2) accurately take by weighing 300g cement, fixedly water cement ratio is 0.25, through changing the water reducer volume, makes flowing degree of net paste of cement reach 300mm, writes down water reducer volume this moment;
(3) choose the H pipe, the internal diameter of the grout outlet of the grout outlet of H pipe is 6 ± 0.1mm, seals grout outlet with pipe close, and the H pipe is fixed on the iron stand, utilizes the clean slurry of step (1) and step (2) the match ratio system of mixing, through embodiment 2 steps test T50 and T100.
When water cement ratio is 0.32; The water reducer volume be 0.20% with water cement ratio be 0.25; The water reducer volume is 0.38% o'clock; Flowing degree of net paste of cement has all reached 300mm, and H pipe records slurry 50mL time spent of flowing and is respectively 8.78s and 14.66s under two kinds of situation, and the 100mL time spent of flowing is respectively 18.40s and 31.90s.Though fluidity is identical, because the admixture water reducer has reduced water cement ratio, slurry viscosity is bigger, so the latter is longer than the former flowing time.The H pipe not only can be monitored fluidity of slurry and changed, and also can characterize different slurry viscosity.
Claims (5)
1. high precision and high-sensitivity cement thick liquid flowability proving installation; It is characterized in that being made up of iron stand (1), H pipe (2), pipe close (3) and graduated cylinder (4), H pipe (2) is fixed on the anchor clamps of iron stand (1), and the grout outlet of H pipe (2) is sealed by pipe close (3); Graduated cylinder (4) places the grout outlet below of H pipe (2); H pipe (2) axis is overlapped with graduated cylinder (4) axis, and described H pipe (2) is made up of storage slurry vertical tube (7), reducing (5) and grout outlet (6), and the internal diameter of its storage slurry vertical tube is 33 ± 0.5mm; Highly be 200 ± 0.5mm; Long 20 ± the 0.5mm of its reducing, the internal diameter of the grout outlet of its grout outlet is 4 ± 0.1mm, 6 ± 0.1mm, 8 ± 0.1mm or 12 ± 0.1mm, pulp pipe range 15 ± 0.5mm.
2. by described high precision of claim 1 and high-sensitivity cement thick liquid flowability proving installation, the range that it is characterized in that graduated cylinder (4) is 250mL, and scale division value is 2mL, and the diameter of graduated cylinder is 40 ± 0.5mm.
3. by described high precision of claim 1 and high-sensitivity cement thick liquid flowability proving installation, it is characterized in that H pipe (2) and graduated cylinder (4) are glass or transparent organic material.
4. the method for testing of described high precision of claim 1 and high-sensitivity cement thick liquid flowability proving installation is characterized in that including following steps:
1) takes by weighing an amount of cement, take by weighing water consumption and add dosage, carry out the stirring of cement paste according to regulation flow process among the JC/T 729 " cement paste stirring machine " by the test match ratio;
2) according to the regulation among the GB/T 8007-2000 " concrete admixture homogenieity test method ", testing procedure 1) the slurry fluidity of gained cement paste;
3) according to step 2) the slurry fluidity of each cement paste of test gained, choose the H pipe (2) of different pulp bores, with pipe close (3) sealing grout outlet, and H managed be fixed on the iron stand (1);
4) step 1) gained cement paste being filled up the H pipe rapidly, begin to use manual time-keeping when removing pipe close (3), is the flowability of 50mL and used time of 100mL judging cement paste through record slurry stream lower volume.
5. by the method for testing of described high precision of claim 4 and high-sensitivity cement thick liquid flowability proving installation, it is characterized in that the choosing method of the H pipe of described different pulp bores is:
When the fluidity D of described cement paste >=360mm, the internal diameter of grout outlet of choosing the grout outlet of H pipe is 4 ± 0.1mm;
When the fluidity of described cement paste was 290≤D＜360mm, the internal diameter of grout outlet of choosing the grout outlet of H pipe was 6 ± 0.1mm;
When the fluidity of described cement paste was 220≤D＜290mm, the internal diameter of grout outlet of choosing the grout outlet of H pipe was 8 ± 0.1mm;
As the fluidity D＜220mm of described cement paste or when not having fluidity, the internal diameter of grout outlet of choosing the grout outlet of H pipe is 12 ± 0.1mm.
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Application publication date: 20120215 |