原文传递
Assessing Highly Workable Concrete Mixtures for CIDH Pile Applications.
| 题名： | Assessing Highly Workable Concrete Mixtures for CIDH Pile Applications. |
| 作者： | Trejo, D.; Hendrix, G. |
| 关键词： | Cast in drilled hole (CIDH), Bridge Design Specifications (BDS), Flowability, Stability, Passing ability, Workability, Methodology, Reinforcement design, Coarse aggregate |
| 摘要： | Cast in drilled hole (CIDH) concrete piles placed using the slurry displacement method require 2 inch (50 mm) inspection pipes be placed parallel to the longitudinal reinforcement. While these pipes are used to detect voids, the inspection pipes may also cause voids due to the limited spacing between the longitudinal reinforcing bars and the inspection pipe. The minimum specified spacing per Caltrans between the longitudinal reinforcing bars and the inspection pipe is 3 inches, which violates the bridge design specifications (BDS) for maximum reinforcement spacing. A separate effort has assessed the structural performance of CIDH piles with varying reinforcing bar spacing. This research will assess critical parameters of concrete to minimize voids in CIDH piles, including the influence of aggregate type and mixture proportions on concrete workability (i.e. flowability, stability, and passing ability). Results from this work indicate that increasing the paste volume and decreasing the voids in the aggregate can significantly increase slump flow. Concrete containing round coarse aggregate can also achieve higher slump flow values than concrete containing crushed coarse aggregate at the same paste volume. While initial results indicate the C bar and J ring test both seem to be reasonable approaches for assessing passing ability in the field, further work is needed. Based on the findings of this research, a methodology for proportioning mixtures was developed that provides adequate flowability, stability, and passing ability to minimize or eliminate voids in CIDH piles. |
| 报告类型： | 科技报告 |
相关文献
- Characterization of Passing Ability of Concrete in CIDH Piles with Wet Conditions.
- Influence of the Spacing of Longitudinal Reinforcement on the Performance of Laterally Loaded CIDH Piles – Analytical Investigation.
- Effect of Pile Diameter on the Modulus of Sub-Grade Reaction. Final rept.
- Long-Term Performance of Sustainable Pavements Using Ternary Blended Concrete with Recycled Aggregate.
- Influence of the Spacing of Longitudinal Reinforcement on the Performance of Laterally Loaded CIDH Piles – Experimental Investigation.
- Silica Fume Concrete for Bridge Decks; Final rept
检索历史
应用推荐
