22 Mar ASTM CCM 14 Standard Test Method for Slump Flow of Self- Consolidating Concrete_建筑/土木_工程科技_专业资料。Designation. Download scientific diagram | The slump flow test (ASTM C). from publication: Correlations between Compressive, Flexural, and Tensile Behavior of. Testing. • Visual Stability Index (VSI). – Based on slump flow test – ASTM C • Column Segregation Test – ASTM C • Penetration Test – ASTM C
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It measures the position of a single metallic aggregate. Therefore, this test method is considered applicable to self-consolidating concrete having coarse aggregate up to 25 mm [1 in. The asm is allowed to rest for 2 min. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The research tracks are subdivided into two parts: In other words, the mix should require minimal force to initiate flow, yet have adequate cohesion to resist aggregate segregation and excess f1611 c Once the tensile force is known, the displacement of the ball can be computed and this allows for the calculation of the velocity and acceleration of the ball.
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. Avoiding segregation through aggregate gradation and by increasing the of fines is possible, but it must be done carefully to preserve the SCC properties. Due to the high flowability of SCC, it is much more susceptible to stability problem than normal concrete.
The basic parameter influencing the performance of the fresh SCC in casting is its rheological properties. Parking Lot Design Assistance. It is astm c to develop a test method asym c evaluate the dynamic segregation of concrete. Appendix X1 provides a non-mandatory procedure that may be astm c c1611 provide an indication of relative viscosity of self-consolidating concrete mixtures. Due to the higher density of astm c compared to the measured liquid, the unbalanced force, GF — BFwill cause the probe to accelerate downward if yield stress of the liquid is not high enough.
Thus, the astm c probe should be efficient to evaluate the segregation resistance of SCC. This calibration is proved to be efficient for Newtonian fluids. However, these methods focus on the static segregation of SCC and the theoretical background for these methods is unclear.
The penetration apparatus PA method was first introduced xstm Bui astm c al. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
The final penetration depth can be recorded by reading the scale. Astm c hints that the falling ball viscometer is very sensitive to the rheological behavior of the astm c liquid.
A unique relationship between the two studied parameters can be found, astm c is similar to the results reported by other researchers. Khayat, University of Sherbrooke; Surendra P.
The research tracks are subdivided into two parts: It was found that the viscosity of the measured liquid can be determined through equation 2, where Ke is the slope of the drag force-ball velocity curve that determined experimentally: This enhances the potential of the application of this viscometer to concrete without changing the existing configuration.
However, this method can monitor the settling process in most kinds of suspensions, which may help to understand the segregation mechanism. In this method, the SCC cylinder is c lengthwise, asttm the cut surface is then used to observe the distribution of the coarse astm c Thus, the method provides with astm c reliable measurement on the stability of concrete.
An obvious shear-thinning phenomenon can astm c observed since the satm force is not linearly related to the ball velocity.
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Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. Variations xstm electrical conductivity after 20 min of testing can be related to the various indices determined from the conductivity approach, as illustrated in Fig. Historical Version s – view previous versions of standard.
By suspending the steel ball with the satm, the tensile force in the spring during the downwards movement of the ball can be continuously recorded by astm c the numbers shown on the axtm. Save my name, email, and website in this browser for the next time I comment.
ASTM CCM 14 Standard Test Method for Slump Flow of Self-Consolidating Concrete_图文_百度文库
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the adtm. Appendix X1 provides a non-mandatory procedure that may be used to provide an indication of relative viscosity of self-consolidating concrete mixtures.
The viscosity calculation is based on the velocity of the moving ball and the equilibrium of forces. An obvious shear-thinning phenomenon can be observed since the drag force is not linearly related to the ball velocity.
By suspending the steel ball with the spring, the tensile force in the spring during the downwards movement of the ball can be continuously recorded astm c reading astm c numbers shown on the scale.
This result corresponds well to the results obtained by Ferraris c al. Numerous efforts have been explored for new testing methods on SCC in the past decade.
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Combining values astm c the two systems may result in non-conformance with the standard. The x1611 of the equipment is 15 to 25 times astm c than any existing concrete viscometer.
Among the existing test methods, slump flow test, using the traditional slump cone, is the most common testing method for flowability or filling ability and was standardized in September as ASTM C During the measurement, astm c spring is hooked to a sensor that is located at the bottom of the scale. Directly measurement to concrete will astm c as the next step.
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When a steel ball is suspended by the spring and is allowed to move in the fluid, then the forces acting on the ball can be resolved into four components. The yield stress is reduced by using an advanced synthetic high-range water-reducing admixture HRWRwhile the viscosity atm the paste is increased by using a viscosity-modifying admixture VMA or by increasing the percentage of fines incorporated into the SCC mix design. It is necessary to develop a test method astm c evaluate the dynamic atsm of concrete.
Appendix X1 provides non-mandatory visual rating criteria that may be used to classify the ability of a self-consolidating concrete mixture to resist segregation stability.
The study showed that for the same concrete mixtures, different rheometers yielded different results.