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DEVELOPMENT OF OPTIMAL CONCRETE SEALANT
TECHNIQUES
| 题名： | DEVELOPMENT OF OPTIMAL CONCRETE SEALANT TECHNIQUES |
| 作者： | Robert L. Mullen. Philip C. Perdikaris |
| 关键词： | Concrete Sealants, Freeze-thaw damage, Concrete durability. Concrete coatings |
| 摘要： | Though concrete coatings and sealants have been known to prolong the service life of concrete highway structures for some time, ignorance of the effect that moisture encapsulation has on the performance of such surface treatments persists. This study investigates the phenomenon of moisture encapsulation and how concrete sealants and coatings influence concrete freeze/thaw durability and moisture migration. In this project several commercially available concrete coatings are applied to concrete cylinders of two sizes. The parameters of the study include curing duration and environment for the concrete, air drying time before coating and coated surface area. Based on freeze/thaw durability tests f 150 cycles) in air of a group of specimens cast with Class “C* structural concrete (4,000 psi or 27.6 MPa) it is concluded that encapsulation of moisture does not contribute to freeze/thaw degradation. Subsequent freeze/thaw cycling of another group of cylinders of lower compressive strength in water demonstrates that coatings do reduce damage due to weathering. Also, it is concluded that no benefits are obtained by leaving portions of the surface area uncoated to insure “breathability" of the concrete'. Furthermore, the important parameter of moisture concentration can be readily and reliably determined by measuring the relative humidity in concrete. A Finite Element Method computer model based on linear diffusion theory is found to adequately predict the drying behavior of concrete treated with relatively impermeable coatings. Nevertheless, it is determined that the process of diffusion alone is insufficient to describe the movement of water in concrete. |
| 报告类型： | 科技报告 |
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