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 .
|Published (Last):||12 October 2007|
|PDF File Size:||12.65 Mb|
|ePub File Size:||10.41 Mb|
|Price:||Free* [*Free Regsitration Required]|
After releasing the screw, the cylinder is allowed to penetrate freely into the concrete for 45 seconds. There are no proper test methods for evaluating the dynamic segregation of SCC. The astm c 1611 conductivity approach can even be used for quality control on the job site. Excess moisture in the ingredients, especially the fine aggregates, can have a profound influence on the consistency of the mix. The total weight of the astm c 1611 is about 18g.
An introduction to the mechanics of fluids,Boston, U. The segregation probe test is simple and rapid and thus astm c 1611 suitable for quality control and other applications such as robustness measurement. This means the segregation astm c 1611 penetrates when the yield stress of suspension is less than 28 Pa and keeps still when yield stress exceeds 28 Pa. It should be noted that the use of this particular polysaccharide-based VMA increased both the yield stress and the plastic viscosity of the cement paste.
The whole probe is made of 1. Recent innovations are presented herein to evaluate the rheological properties and static segregation resistance of SCC quantitatively. The penetration depth marked on the rod is used to determine the stability rating according to Table 1. The segregation probe is then placed gently on the concrete surface allowed to settle for 1 minute.
Appendix X1 provides a non-mandatory procedure that may be used to provide an astm c 1611 of relative viscosity of self-consolidating concrete mixtures. Therefore, this test method is considered applicable to self-consolidating concrete having coarse aggregate up to 25 mm [1 in. Due to the higher density of steel 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.
An obvious shear-thinning phenomenon can be observed since the drag force is not linearly related to the ball velocity. Stability and homogeneity of SCC are two key issues that influence the mechanical and durability performance of the material in its hardened state.
During the test, the final slump flow diameter and T50 time needed for concrete to reach a spread diameter of 20 in.
Slump Flow of Self-Consolidation-ASTM C – Video Dailymotion
For example, segregation probe test can be used to study the robustness of Astm c 1611, and the yield stress and viscosity measurements can help to understand the formwork pressure produced by SCC. In steady state condition and when Reynolds number Rn is less than 0.
As shown in Fig. This helps the SCC to satisfy the performance requirement in the field, such as giving a smooth surface finish, encapsulate the reinforcement without blocking astm c 1611 aggregates, etc. Image analysis software is used to calculate and compare the percentages of asgm aggregates in different levels of the cut cylinder. Both the plastic viscosity and xstm yield stress are plotted as a function of VMA dosage in Fig. They help to improve the understanding of the material behavior.
In this method, a concrete covermeter is used to monitor the position of a metallic aggregate, which is designed to have similar size and density to astm c 1611 coarse aggregate. The designed viscometer has proved to be efficient ast, both cement pastes and mortars.
The concrete is allowed to rest for 2 min.
ASTM C1611/C1611M – 14
It is obvious that the segregation probe will not penetrate the liquid if the yield stress is big enough equation 7. Static stability refers to the resistance of SCC to bleeding and segregation after the SCC is cast until it is hardened. This strong correlation confirms that the yield astm c 1611 can be the dominant parameter that governs the slump flow asm. Avoiding segregation through aggregate gradation and by astm c 1611 the amount of fines is possible, but it must be done carefully to preserve the SCC properties.
Astm c 1611, the relationship between the initial resistance to motion subsequently called initial drag force D 0 and the yield stress T y of the measured liquid can be expressed as follows: Directly measurement to concrete will be conducted as the next step.
Thus, the method provides with the reliable measurement on the stability of concrete. This enhances the potential of the application of this viscometer to concrete without changing the existing atm.
Good correlations were established between the stability of concrete determined from physical testing external bleeding and homogeneity of 161 aggregate distribution along hardened concrete samples and the bleeding, segregation, and homogeneity indices evaluated from the conductivity approach, as illustrated in Fig. In the second step, the research astm c 1611 carried out on SCC mortars made with various sand contents but the same paste matrix. The precision and reproducibility of the introduced methods need to astm c 1611 further investigated.
The research tracks are subdivided into two parts: The method evaluates segregation qualitatively and it relies on the experience of the examiner.