CN104181069A - Device and method for evaluating dynamic stability of self-compacting concrete mixture - Google Patents
Device and method for evaluating dynamic stability of self-compacting concrete mixture Download PDFInfo
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- CN104181069A CN104181069A CN201410428755.1A CN201410428755A CN104181069A CN 104181069 A CN104181069 A CN 104181069A CN 201410428755 A CN201410428755 A CN 201410428755A CN 104181069 A CN104181069 A CN 104181069A
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Abstract
The invention discloses a device and a method for evaluating dynamic stability of a self-compacting concrete mixture. The device is close to practicality of concrete engineering and is simple in structure and convenient to operate. The device comprises a base, a stability testing container and a motor, wherein a fixed support block is arranged in the middle of the base; two movable support blocks are arranged at two ends of the base, respectively; the stability testing container is in hinge joint with the fixed support block; the motor is connected with the stability testing container. The method comprises the following steps: adding the prepared self-compacting concrete mixture into the stability testing container, starting the motor to enable the stability testing container to obliquely move up and down for a period of time, respectively taking mixtures with equal quantity from two ends of the stability testing container, sieving and washing to remove slurry and fine particles, then respectively weighing the mixtures to obtain M1 and M2, and calculating a dynamic stability index DS by virtue of a formula which is shown in the specification, wherein the larger a numerical value is, the lower the dynamic stability is.
Description
Technical field
The present invention relates to concrete mixture characteristic assessment technique field, particularly a kind of autodensing concrete almixture dynamic stability evaluating apparatus and method of testing concrete material performance.
Background technology
Concrete mix is comprised of different densities and big or small material, and the cohesive strength between composition material is not enough to resist coarse aggregate, and composition is separated from each other, and affects workability, causes inner the Nomenclature Composition and Structure of Complexes inhomogeneous, the security of havoc structure.Self-compacting concrete requires fillibility, education resistance and gap trafficability characteristic high, thereby mobility is large, and each component produces separated tendency and increases.The dynamic stability of autodensing concrete almixture is to weigh the important indicator of serviceability quality.Before construction, evaluate objectively the dynamic stability of mixture, so that revise early Mix Proportion, reduce the harm that dynamic instability brings.Through years development, in the research of concrete mix stability test, obtained very much progress both at home and abroad, but do not formed yet unified evaluation means for autodensing concrete almixture dynamic stability test aspect.
Through the literature search of existing concrete estimation of stability device is found, Chinese invention patent " autodensing concrete almixture estimation of stability device " (CN201016975Y), this patent discloses a kind of autodensing concrete almixture estimation of stability device, this device is mainly to consist of jumping table and Detection of Stability cylinder, by the up-down vibration of jumping table, simulate the dynamic of mixture, the problem that flows and do not conform to while existing with self-compact concrete in construction.
Summary of the invention
The invention provides a kind of concrete works reality that approaches, there is simple in structure, easy to operate autodensing concrete almixture dynamic stability evaluating apparatus and method.
For reaching above-mentioned purpose, a kind of autodensing concrete almixture dynamic stability of the present invention evaluating apparatus, described device comprises base, stability test container and motor, in the middle of described base, be provided with fixed support block two ends and be respectively equipped with movable supporting piece, described stability test container is hinged and is connected in described fixed support block, and described motor connects described stability test container.
Wherein said fixed support block is triangle fixed support block, and wedge angle part in top is hinged with described stability test container.
Wherein said movable supporting tile height is identical and identical apart from described substructure height with described stability test vessel level state lower bottom part.
Wherein said motor is connected with described stability test container by connecting rod.
Wherein said motor is back-geared motor.
Wherein said stability test container is rectangle rustless steel container.
The inwall of wherein said stability test container has inorganic coating.
Another object of the present invention is also to provide the method for utilizing said apparatus to evaluate autodensing concrete almixture dynamic stability, the method is easy and simple to handle, can record the stability index of dynamically lower grout, before construction, evaluate objectively the stability of slurry, to revise early the proportioning of slurry, reduce the harm that dynamic instability brings, there are wide market outlook, use described device to carry out a method for estimating stability, comprise the following steps:
(1) preparation autodensing concrete almixture;
(2) by described movable supporting piece, described base is adjusted to level, at described stability test container, pack described autodensing concrete almixture into;
(3) open described motor, by described connecting rod, drive in the frequency of described stability test container with two seconds cycles and have a down dip 5 minutes;
(4) close described motor, use described movable supporting piece to make described stability test container in level;
(5) respectively the described mixture of described stability test container two ends equivalent is respectively charged in the circular hole sieve that aperture is 5mm, with clear water, rinse described mixture respectively, screen out slurry and fine grained, after remaining coarse aggregate surface free water is removed, claim its quality of described coarse aggregate to be respectively M
1and M
2;
(6) by following formula, calculate corresponding autodensing concrete almixture dynamic stability evaluation index-dynamic stability index D S:
The invention difference from existing technology is that the present invention has obtained following technique effect:
(1) the present invention uses the container construction simulation interface of inorganic coating, the autodensing concrete almixture simulation mixture that has a down dip in container flows on construction interface, evaluation approaches practice of construction condition, has overcome the deficiency existing in autodensing concrete almixture estimation of stability;
(2) the present invention is simple in structure, easy and simple to handle with evaluating apparatus, evaluates objectively the stability of mixture before construction, to revise early the proportioning of slurry, reduces the harm that dynamic instability brings, and has wide market outlook;
(3) the present invention can record dynamically lower stability index of autodensing concrete almixture, makes autodensing concrete almixture performance evaluation more comprehensively, reliably.
Below in conjunction with accompanying drawing, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the structural representation of autodensing concrete almixture dynamic stability evaluating apparatus of the present invention.
Description of reference numerals: 1-base, 2-movable supporting piece, 3-stability test container, 4-connecting rod, the back-geared motor of 5-; 6-fixed support block.
Embodiment
Below in conjunction with drawings and Examples, technical characterictic and the advantage of the above-mentioned a kind of autodensing concrete almixture estimation of stability device of the present invention are described in more detail.
Shown in Figure 1, a kind of autodensing concrete almixture estimation of stability device, mainly movable supporting piece 2, stability test container 3, connecting rod 4 and the back-geared motor 5 by base 1, fixed support block 6, two ends forms.Leg-of-mutton fixed support block 6 is fixed on base 1 middle part, and wedge angle top and stability test container 3 bottoms are hinged; Stability test container 3 is rectangle rustless steel containers, the inwall of container has inorganic coating, there is respectively movable supporting piece 2 at base 1 two ends, two movable supporting pieces 2 are highly identical and identical to the height of base with stability test container 3 horizontality bottom surfaces, and stability test container 3 is connected with back-geared motor 5 by connecting rod 4.
During use, first prepare the self-compacting concrete of certain volume, base 1 is adjusted to level, two movable supporting pieces 2 are moved into the two ends of stability test container 3, regulate the height of movable supporting piece 2, make stability test container 3 in level, the self-compacting concrete sample preparing is packed in stability test container 3, remove movable supporting piece 2, starter motor 5 power supplys, under connecting rod 4 drives, stability test container 3 moved up and down with two seconds cycles, after 5 minutes, disable motor 5 power supplys, move into movable supporting piece 2, and regulate the height of movable supporting piece 2, make stability test container 3 in level, then respectively stability test container 3 two ends equivalent mixtures are packed in the circular hole sieve that aperture is 5mm, with clear water, rinse mixture, screen out slurry and fine grained, remaining coarse aggregate surface free water is removed, with electronic balance, claim its mass M
1and M
2, be accurate to 0.1 gram, by calculating corresponding autodensing concrete almixture dynamic stability evaluation index---dynamic stability index D S,
Numerical value is larger, illustrates that dynamic stability is poorer, and General Requirements autodensing concrete almixture dynamic stability index D S is less than or equal to 20%.
Embodiment mono-:
By following component, prepare self-compacting concrete: cement 372g; Flyash 132g; Silicon ash 12g; No. 1 sandstone 1200g; No. 2 sandstone 90g; No. 3 sandstone 828g; Water reducer 6g; Swelling agent 18g; Water 204g; Each component forms self-compacting concrete after stirring in stirring machine.Base 1 is adjusted to level, two movable supporting pieces 2 are moved into the two ends of stability test container 3, regulate the height of movable supporting piece 2, make stability test container 3 in level, and the self-compacting concrete sample preparing is packed in stability test container 3, remove movable supporting piece 2, starter motor 5 power supplys, under connecting rod 4 drives, stability test container 3 moved up and down with two seconds cycles, after 5 minutes, disable motor 5 power supplys, move into movable supporting piece 2, and regulate the height of movable supporting piece 2, make stability test container 3 in level, then get respectively apart from the mixture of stability test container 3 two ends 200mm and pack in the circular hole sieve that aperture is 5mm, with clear water, rinse mixture, screen out slurry and fine grained, remaining coarse aggregate surface free water is removed, with electronic balance, divide another name its quality, M
1for 616.1g, other end coarse aggregate mass M
2for 524.8g, by (1) formula, calculating this autodensing concrete almixture dynamic stability evaluation number DS is 16%.
Embodiment bis-:
By following component, prepare self-compacting concrete: cement 408g; Flyash 145g; Silicon ash 15g; No. 1 sandstone 1200g; No. 2 sandstone 90g; No. 3 sandstone 816g; Water reducer 9.5g; Swelling agent 18g; Water 186g; Each component forms self-compacting concrete after stirring in stirring machine.Base 1 is adjusted to level, two ends movable supporting piece 2 is moved into the two ends of stability test container 3, regulate the height of movable supporting piece 2, make stability test container 3 in level, the self-compacting concrete sample preparing is packed in stability test container 3, remove movable supporting piece 2, starter motor 5 power supplys, under connecting rod 4 drives, stability test container 3 moved up and down with two seconds cycles, after 5 minutes, disable motor 5 power supplys, move into movable supporting piece 2, and regulate the height of movable supporting piece 2, make stability test container 3 in level, then get respectively apart from the mixture of stability test container 3 two ends 200mm and pack in the circular hole sieve that aperture is 5mm, with clear water, rinse mixture, screen out slurry and fine grained, remaining coarse aggregate surface free water is removed, with electronic balance, divide another name its quality, M
1for 588.9g, other end coarse aggregate mass M
2for 564.2g, by (1) formula, calculating this autodensing concrete almixture dynamic stability evaluation number DS is 5%.
Embodiment tri-:
By following component, prepare self-compacting concrete: cement 372g; Flyash 132g; Silicon ash 12g; No. 1 sandstone 1200g; No. 2 sandstone 0g; No. 3 sandstone 912g; Water reducer 5.5g; Swelling agent 18g; Water 204g; Each component forms self-compacting concrete after stirring in stirring machine.Base 1 is adjusted to level, the movable supporting piece at two ends 2 is moved into the two ends of stability test container 3, regulate the height of movable supporting piece 2, make stability test container 3 in level, and the self-compacting concrete sample preparing is packed in stability test container 3, remove movable supporting piece 2, starter motor 5 power supplys, under connecting rod 4 drives, stability test container 3 moved up and down with two seconds cycles, after 5 minutes, disable motor 5 power supplys, move into movable supporting piece 2, and regulate the height of movable supporting piece 2, make stability test container 3 in level, then get respectively apart from the mixture of stability test container 3 two ends 200mm and pack in the circular hole sieve that aperture is 5mm, with clear water, rinse mixture, screen out slurry and fine grained, remaining coarse aggregate surface free water is removed, with electronic balance, divide another name its quality, M
1for 619.8g, other end coarse aggregate mass M
2for 515.6g, by (1) formula, calculating this autodensing concrete almixture dynamic stability evaluation number DS is 19%.
Embodiment tetra-:
By following component, prepare self-compacting concrete: cement 372g; Flyash 132g; Silicon ash 12g; No. 1 sandstone 1200g; No. 2 sandstone 0g; No. 3 sandstone 0g; No. 4 sandstone 912g; Water reducer 5.5g; Swelling agent 18g; Water 205g; Each component forms self-compacting concrete after stirring in stirring machine.Base 1 is adjusted to level, two ends movable supporting piece 2 is moved into the two ends of stability test container 3, regulate the height of movable supporting piece 2, make stability test container 3 in level, and the self-compacting concrete sample preparing is packed in stability test container 3, remove movable supporting piece 2, starter motor 5 power supplys, under connecting rod 4 drives, stability test container 3 moved up and down with two seconds cycles, after 5 minutes, disable motor 5 power supplys, move into movable supporting piece 2, and regulate the height of movable supporting piece 2, make stability test container 3 in level, then get respectively apart from the mixture of stability test container 3 two ends 200mm and pack in the circular hole sieve that aperture is 5mm, with clear water, rinse mixture, screen out slurry and fine grained, remaining coarse aggregate surface free water is removed, with electronic balance, divide another name its quality, M
1for 785.1g, other end coarse aggregate mass M
2for 550.6g, by (1) formula, calculating this autodensing concrete almixture dynamic stability evaluation number DS is 36%.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (8)
1. an autodensing concrete almixture dynamic stability system safety testing device, it is characterized in that: described device comprises base, stability test container and motor, in the middle of described base, be provided with fixed support block, two ends are respectively equipped with movable supporting piece, described stability test container is hinged and is connected in described fixed support block, and described motor connects described stability test container.
2. autodensing concrete almixture dynamic stability evaluating apparatus as claimed in claim 1, is characterized in that: described fixed support block is triangle fixed support block, and wedge angle part in top is hinged with described stability test container.
3. autodensing concrete almixture dynamic stability evaluating apparatus as claimed in claim 1, is characterized in that: described movable supporting tile height is identical and identical apart from described substructure height with described stability test vessel level state lower bottom part.
4. autodensing concrete almixture dynamic stability evaluating apparatus as claimed in claim 1, is characterized in that: described motor is connected with described stability test container by connecting rod.
5. autodensing concrete almixture dynamic stability evaluating apparatus as claimed in claim 1, is characterized in that: described motor is back-geared motor.
6. autodensing concrete almixture dynamic stability evaluating apparatus as claimed in claim 1, is characterized in that: described stability test container is rectangle rustless steel container.
7. autodensing concrete almixture dynamic stability evaluating apparatus as claimed in claim 1, is characterized in that: the inwall of described stability test container has inorganic coating.
8. in right to use requirement 1-7, described in any one, device carries out a method for estimating stability, it is characterized in that comprising the following steps:
(1) preparation autodensing concrete almixture;
(2) by described movable supporting piece, described base is adjusted to level, at described stability test container, pack described autodensing concrete almixture into;
(3) open described motor, by described connecting rod, drive described stability test container with the upper and lower banking motion of frequency in two second cycle 5 minutes;
(4) close described motor, use described movable supporting piece to make described stability test container in level;
(5) respectively the described mixture of described stability test container two ends equivalent is respectively charged in the circular hole sieve that aperture is 5mm, with clear water, rinse described mixture respectively, screen out slurry and fine grained, after remaining coarse aggregate surface free water is removed, claim its quality of described coarse aggregate to be respectively M
1and M
2;
(6) by following formula, calculate corresponding autodensing concrete almixture dynamic stability evaluation index-dynamic stability index D S:
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| CN201410428755.1A CN104181069A (en) | 2014-08-27 | 2014-08-27 | Device and method for evaluating dynamic stability of self-compacting concrete mixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104777078A (en) * | 2015-05-11 | 2015-07-15 | 中南大学 | Stability testing device for self-compact concrete mixture of filling layer and testing method of stability testing device |
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Cited By (2)
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| CN104777078A (en) * | 2015-05-11 | 2015-07-15 | 中南大学 | Stability testing device for self-compact concrete mixture of filling layer and testing method of stability testing device |
| CN104777078B (en) * | 2015-05-11 | 2017-06-09 | 中南大学 | Filling bed self-dense concrete mixture stability testing device and its method of testing |
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Application publication date: 20141203 |