CN201016975Y

CN201016975Y - Self-dense concrete mixture stability testing device

Info

Publication number: CN201016975Y
Application number: CNU2007200627189U
Authority: CN
Inventors: 谢友均; 龙广成; 李彦广
Original assignee: Central South University
Current assignee: Central South University
Priority date: 2007-03-16
Filing date: 2007-03-16
Publication date: 2008-02-06
Anticipated expiration: 2017-03-16

Abstract

The utility model discloses a self-compacting concrete mix stability test evaluation device, including a stability detection cylinder and a jump table. The stability detection cylinder consists of three piled up cylinder sections of the same size. The lowest cylinder section is equipped with a bottom plate. The stability detection cylinder is arranged on the jump table. The utility model has the advantages of simple structure, convenient production, simple operation and reliable performance. Coarse aggregate vibration segregation rate parameters obtained from the test of the utility model can objectively and accurately reflect the stability of the mix.

Description

The autodensing concrete almixture stability test device

Technical field

The utility model relates to a kind of autodensing concrete almixture stability test device of testing the concrete material performance.

Background technology

Concrete workability is carried out test evaluation exactly, is the difficult problem of a complexity.At present, widespread use is the slump cone method ^[1]([1] P.Kumar Mehta, Paulo J.M.Monteiro.CONCRETE:microstructure, properties and materials[M, third edition] .The McGraw-HillCompanies, New York, 2006), this method is simple and easy, but must could reflect concrete rheological properties in conjunction with subjective experience.Self-compacting concrete comprises the content of three aspects such as fillibility, education resistance and gap trafficability characteristic because the requirement of its workability is very high ^[2]([2] Hajime Okamura and MasahiroOuchi.Self-compacting concrete:Development, present use and future[C], In:Proceedings of 1 ^StInternational RILEM Symposium on self-compacting concrete, Stockholm, Sweden, September, 1999:3～14), the index that adopts traditional slump cone method test to obtain is not enough to reflect " self compacting ability " feature and the requirement of self-compacting concrete, and test result susceptibility is poor.Therefore, at the characteristics of self-compacting concrete, the testing tool of many relevant self-compacting concrete workabilities has been developed in countries in the world ^[3]([3] P J.M.Bartos.Testing-SCC:Towards new EuropeanStandards for fresh SCC[C], In:Proceedings of 1 ^StInternational symposium on design, performance and use of self-consolidating concrete, Changsha, China, 2005:25-46), as L shaped mobile instrument, V-arrangement funnel, Orimet instrument, J ring instrument etc.Yet these single methods also are not enough to reflect the rheological property of self-compacting concrete comprehensively, particularly can not estimate the education resistance energy of self-compacting concrete well, and 2 kinds or 3 kinds of methods combine use often, and complicated operation, repdocutbility are poor.For the big concrete of flowability, each component produces the tendency of separating and increases, thereby the stability of each component of mixture or education resistance can be the important indicators of weighing the workability quality.For this reason, abroad some scholar can also propose corresponding test evaluation device at the education resistance of autodensing concrete almixture ^[4,5]([4] V.K.Buia, D.Montgomeryb, I.Hinczakc, K.Turner.Rapid testing method for segregationresistance of self-compacting concrete[J], Cement and Concrete Research, 2002,32 (9): 1489-1496; [5] M.Sonebi, M.Rooney and P.J.M.Bartos.Evaluation ofthe segregation resistance of fresh self-compacting concrete using different testmethods[C], In:Proceedings of 1 ^StInternational symposium on design, performanceand use of self-consolidating concrete, Changsha, China, 2005:301-308), and the rarely seen report of the research of domestic related fields.Existing concrete mix education resistance can proving installation only be based on the result of study in the testing laboratory, without a large amount of excessively engineering practice checks, and in the simulation mixture each component because the separation tendentiousness under the deadweight effect is obviously not enough.

Summary of the invention

For solve exist in the workability of concrete test evaluation technical matters, the utility model provides a kind of simple in structure, autodensing concrete almixture stability test device that precision is high.

The technical scheme that the utility model solves the problems of the technologies described above is: comprise Detection of Stability tube, jumping table, the Detection of Stability tube is stacked by the measure-alike same cylindrical drum of three joints to be formed, and descends the pitch circle column casing to be provided with base plate most, and the Detection of Stability tube places on the jumping table.

In the above-mentioned self-compacting concrete stability test device, described two cylindrical drum joints are provided with outstanding limit, and use bolt.

In the above-mentioned self-compacting concrete stability test device, described Detection of Stability tube is made up of the measure-alike cylindrical drum of 3 joints, and the internal diameter of every joint tube is 115mm, highly is 100mm.

Technique effect of the present utility model is:

1, adopt this device can obtain reflecting in the concrete mix coarse aggregate and the slurry parameter of kinetic property-coarse aggregate vibration isolation rate separately under deadweight and external force effect; And the parameter that test obtains can objective, reasonably reflect the stability of autodensing concrete almixture;

2, the utility model is simple in structure, simple to operate, quick, evaluation index explicit physical meaning, susceptibility and repdocutbility is good as a result.

3, can reflect the vertical relative motion tendency of each component in the autodensing concrete almixture, and reflect the viscosity of concrete mix indirectly.

In sum, the utility model is a kind of autodensing concrete almixture stability test evaluating apparatus, the parameter that obtains by this device to test can objective, accurately reflect stable (anti-segregation) performance of each component in the mixture, and simple in structure, easily manufactured, simple to operate, dependable performance.

Following structure the drawings and specific embodiments are further described the utility model.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

Referring to Fig. 1, the utility model comprises Detection of Stability tube, jumping table, and the Detection of Stability tube is stacked by the identical cylindrical drum 2,3,4 of three joints to be formed, cylindrical drum 2 is provided with base plate, and places on the jumping table 1, and two cylindrical drum joints are provided with outstanding limit 6,7, have the hole on the outstanding limit, fixing with bolt 5.The internal diameter of cylindrical drum 2,3,4 is 115mm, highly is 100mm.The jumping table amplitude that uses in the utility model is 25 ± 2mm, per second vibration 1 time, and vibration number is 25 times.

During use, the concrete mix sample is packed in the Detection of Stability tube, the detection tube that fills with mixture is placed on the jumping table, start jumping table 2, vibrate 25 times, test detects the wet coarse aggregate content in each joint tube in the tube then, and obtains coarse aggregate vibration isolation rate parameter, estimates the stability of concrete mix thus.

By test, the vibration number of jumping table and the relation between the estimation of stability index have been determined.The result has shown after jumping table vibrates 25 times further increases vibration number again, and the no longer significant change of coarse aggregate vibration isolation rate of acquisition shows that the jumping table vibration is rational 25 times.And the mixture workability is influenced significant parameter by changing super plasticizer parameter, water consumption etc., and change the rheological properties of mixture, adopt this device to test comparison then, relatively the variation susceptibility between each test parameter.Testing research is the result show, the mixture stability parameter that this device to test obtains is with mixture change of properties sensitivity.And, verified science, the reliability of this Detection of Stability method and evaluation index thereof by coarse aggregate in the concrete of corresponding mixture sclerosis back is carried out mathematical analysis in vertical Two dimensional Distribution.

Referring to Fig. 1, at first autodensing concrete almixture is packed in the Detection of Stability tube with hopper, flatly vertically remove hopper to the hopper mouth, leave standstill 1min, will unnecessary mixture remove and floating with spatula, gently smear, do not allow pressure to smear.The Detection of Stability tube is placed on the jumping table, rotates rocking handle p.s. one time, jumping table is beated 25 times.Merogenesis is removed the Detection of Stability tube then, and be in the circular hole sieve of 5mm with the aperture of packing into of a mixture in the every joint tube, use the flushing with clean water mixture, screen out slurry and fine aggregate, remaining coarse aggregate is wiped away the moisture of doing the surface with sponge, weigh its quality in the balance, be accurate to 1g, the weight in wet base that obtains coarse aggregate in the three sections mixtures in upper, middle and lower respectively is m ₁, m ₂And m ₃At last, calculate corresponding autodensing concrete almixture estimation of stability index one coarse aggregate vibration isolation rate fm.

Claims

1. autodensing concrete almixture stability test device, it is characterized in that: comprise Detection of Stability tube, jumping table, the Detection of Stability tube is stacked by the measure-alike cylindrical drum of three joints to be formed, and descends the pitch circle column casing to be provided with base plate most, and the Detection of Stability tube places on the jumping table.

2. self-compacting concrete stability test device according to claim 1 is characterized in that: described two cylindrical drum joints are provided with outstanding limit, and use bolt.

3. self-compacting concrete stability test device according to claim 1 is characterized in that: the internal diameter of described cylindrical drum is 115mm, highly is 100mm.

4. self-compacting concrete stability test device according to claim 1 is characterized in that: described jumping table amplitude is 25 ± 2mm, per second vibration 1 time, and vibration number is 25 times.