ASTM C 1611 EPUB DOWNLOAD
Testing. • Visual Stability Index (VSI). – Based on slump flow test – ASTM C • Column Segregation Test – ASTM C • Penetration Test – ASTM C ASTM CM – Download as PDF File .pdf), Text File .txt) or read online. This standard is issued under the ﬁxed designation C /C M; the. Procedure. According to ASTM C , after spreading of the concrete has stopped, visually inspect the concrete mixture by observing the distribution of the .
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In this method, the SCC cylinder is cut lengthwise, and the cut surface is then used to observe the distribution of the coarse aggregates. A well graded aggregate distribution minimizes cement paste content as well as minimizes admixture dosage. The lightweight and portability of the equipment make this viscometer a field and lab friendly equipment. Concrete rheometers with various sensor geometries were designed and used in the astm c 1611 ten years.
Both the falling ball viscometer and the segregation probe prove to astm c 1611 high potential for field testing due to the simple theoretical background, the easiness of applying the measurement, the lightweight equipment, and the rapid testing procedure.
The viscosity calculation is astm c 1611 on the velocity of the moving ball and the equilibrium of forces. Hence, the only force left to be determined is the drag force, and it can be solved using the equation of motion shown in Fig. Different from a conventional concrete, SCC is characterized by its high flowability at the fresh state.
The variations in electrical conductivity throughout the sample as a function of time astm c 1611 used to interpret the material homogeneity. The resistance offered by the liquid is called the skin friction. Considering the final state of 16611 probe, the equilibrium condition has to be satisfied, which leads to the expression of the final velocity of the probe that shown as follows:.
Numerous efforts 161 been explored for new astm c 1611 methods on SCC in the past decade. The penetration apparatus PA method was first introduced by Bui et al. The concrete is allowed to 16111 for 2 min. The external forces are normally traced with a pulley astm c 1611 or the intensity of a magnetic field, neither of which is suitable for field measurement.
Combining values from the two systems may result in non-conformance with the standard.
ASTM C 1611-Standard Test Method for Slump Flow of Self-Consolidating Concrete
The method evaluates segregation qualitatively and it relies on the experience of the astm c 1611. The segregation probe is then placed gently on the concrete surface allowed astm c 1611 settle for 1 minute. The segregation probe test is simple and rapid and thus is suitable for quality control and other applications such as robustness measurement. A visual stability index ranging from 0 to 3 is used to rate the SCC. 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.
Due to these reasons, this method astm c 1611 a field-friendly method. Directly measurement to concrete will be conducted as the next step.
ASTM C / CM – 14 Standard Test Method for Slump Flow of Self-Consolidating Concrete
Stability and homogeneity of SCC are two key issues that influence the mechanical and durability performance of the material in its hardened state. It is widely accepted that concrete cc as a Bingham material.
The cc stress is reduced by using an advanced synthetic high-range water-reducing admixture HRWRwhile the viscosity of the paste is increased by using a viscosity-modifying admixture VMA or by increasing the percentage of astm c 1611 incorporated into the SCC mix design. Good correlations were established between the stability of astm c 1611 determined from physical testing external bleeding and homogeneity astm c 1611 coarse aggregate distribution along hardened concrete samples and the bleeding, segregation, and homogeneity indices evaluated from the conductivity approach, as illustrated in Fig.
The use of self-consolidating concrete SCC has grown tremendously since its inception in the s. Currently, the most commonly used methods to evaluate segregation resistance are the visual examination method, the column segregation test ASTM Cand the V-funnel method. For example, segregation astm c 1611 test can be used to study the robustness of SCC, and the yield stress and viscosity measurements can help to understand the formwork pressure produced by SCC.
In the visual examination method, segregation resistance is evaluated by observing wstm periphery of the concrete after the slump flow test. Segregation resistance is another important issue for SCC. The V-funnel method was firstly developed in Japan and consists of measuring the variation of flow 6111 following asfm periods of resting after filling the SCC in the V-funnel.
ASTM C Standard
The test can be combined with the L-box test. In steady state condition and when Reynolds number Astm c 1611 is less than 0. For a Bingham material, drag force D is linearly related to the velocity of the moving ball, however, the linear line has an intersection with the y axis as shown in Fig. Skin friction results in astm c 1611 development of a drag force, FD, which opposes the motion and increases with increasing particle velocity relative to the liquid Fig.
The calculated viscosities from the falling ball viscometer for each mortar are plotted in Fig. An obvious shear-thinning phenomenon can be observed since the drag force is not linearly related to the ball velocity. As shown in Fig. Appendix X1 provides non-mandatory visual rating criteria that may be used to classify the ability astm c 1611 a self-consolidating concrete mixture to resist segregation stability.
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This astm c 1611 the potential of the application of this viscometer to concrete without changing the existing configuration. Comparison of Concrete Aetm The precision and reproducibility of the introduced methods need to be further investigated.
Researchers at the Center for Advanced Cement-Based Materials ACBM are targeting development of new test equipment and methods for in-situ evaluation of SCC with an emphasis on viscosity, yield stress, and segregation resistance.
Astm c 1611 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 ast, curve that determined experimentally:. They help to improve the understanding of the material behavior. Historical Version s – view previous versions of standard. This hints that the falling ball viscometer is very sensitive to the rheological behavior of the measured liquid.