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Concrete Bridge Deck Overlays in Illinois: Mix Design
Experimentation and Investigation of Construction Methods
| 题名： | Concrete Bridge Deck Overlays in Illinois: Mix Design Experimentation and Investigation of Construction Methods |
| 作者： | Brian A. Pfeifer |
| 关键词： | microsilica, bridge deck overlay, ternary, bridge rehabilitation, permeability |
| 摘要： | The purpose of a bridge deck overlay is to extend the life of a structure by providing a durable wearing surface and a barrier against chloride intrusion. The majority of the deck overlays in Illinois* recent past have contained microsilica. Problems associated with microsilica deck overlays, such as rapid slump loss, poor constructability, and shrinkage cracking, prompted die development of three alternative mix designs and a subsequent field evaluation. In Design 1, the microsilica content was dropped from 5C to 33 lbs/yd3. Design 2, a ternary mix design, contains cement, microsilica, and Class C fly ash. Design 3, which contains fly a^ and no microsilica, has a 25% cement replacement rate at a 1.5:1 replacement ratio. All three designs share changes in course aggregate gradation, proportion of coarse and fine aggregate, and water-cement ratio. Twenty-one bridge deck overlays were included in die field evaluation of die three mix designs. All of die overlays used the new designs and were constructed in 1998. Construction observations are reported as well as various test results, including flexural strength, rapid chloride permeability (Illinois Modified AASHTO T 277), salt ponding and chloride ion content, and tensile strength of bond (pull-off). Also, initial distress surveys of all 21 structures were performed between three and six months after die overlays were placed. |
| 报告类型： | 科技报告 |
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