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Concrete Bridge Deck Overlays in Illinois: Mix Design Experimentation and Investigation of Construction Methods; Interim rept. May 98-Jul 99
| 题名： | Concrete Bridge Deck Overlays in Illinois: Mix Design Experimentation and Investigation of Construction Methods; Interim rept. May 98-Jul 99 |
| 作者： | Pfeifer, B. A. |
| 关键词： | Bridge decks; Pavement overlays; Construction techniques; Fly ash; Pavement damage; Mixtures; Illinois; Corrosion prevention; Chlorides; Field tests; Permeability; Pozzolans |
| 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 the development of three alternative mix designs and a subsequent field evaluation. In Design 1, th microsilica content was dropped from 50 to 33 lbs/cu yd. Design 2, a ternary mix design, contains cement, microsilica, and Class C fly ash. Design 3, which contains fly ash and no microsilica, has a 25% cement replacment rate at a 1.5:1 replacement ratio. All three designs share changes in coarse aggregate gradation, proportion of coarse and fine aggregate, and water-cement ratio. Twenty-one bridge deck overlays were included in the field evaluation of the three mix designs. All of the 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 the overlays were placed. |
| 总页数： | 58p |
| 报告类型： | 科技报告 |
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