Grouts for bonded post-tensioning in corrosive environments

Problems with corrosion of prestressing steel in post-tensioned structures due to inadequate grouting in the past have become more apparent in recent years. To improve grouting practices a series of fresh property tests, acce lerated corrosion tests, simulated field testing, and long-term corrosion t esting were used in this study to develop optimum grouts for post-tensionin g Grouts possessing adequate workability and bleed resistance were tested i n art accelerated corrosion test to evaluate relative corrosion protection properties. This paper focuses on the accelerated corrosion test results. T he most promising of these grouts were then tested for placeability under s imulated field conditions. A fly ash grout and a thixotropic grout are reco mmended from this testing program. Additionally, an important benefit from this testing was fluidity, bleed and corrosion resistance data acquired for a number of different combinations of pozzolans and admixtures.