Control of Concrete Cracking in Bridges (2017) / Chapter Skim
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Pages 61-67
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61 This chapter contains case examples describing how four states have looked for solutions for preventing or reducing cracking in concrete bridge decks. California Department of transportation The following case example is extracted from an article by Maggenti et al.
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62 of polymer fibers, and stricter curing requirements. In 2013, a Caltrans fact sheet estimated that Caltrans was spending $50 million annually on sealing cracks in concrete bridge decks.
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63 Curing during cold weather requires extra precautions to reduce cracking caused by thermal stresses. To prevent cracking, the difference between the concrete and steel girder temperatures must be kept within a tolerable range.
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64 within the first 90 days. Prewetted LWA reduced early-age and long-term shrinkage (Browning et al.
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65 After construction of the eastbound lanes, crack surveys made immediately after curing and in subsequent months showed a dramatic reduction in the frequency and width of cracks. Early-age cracking immediately after curing was nearly eliminated by the changes in mixture design and construction practices.
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66 in the application of wet burlap to the surface of the bridge deck. This delay occurred because the texturing was done by tining transverse grooves with a metal comb and could not occur until the concrete was sufficiently stiff.
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67 variables that affect the cracking performance of a bridge deck, and these may change during the construction of the bridge. A similar effect was observed by Mokarem et al.
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