No abstract
On April 26 and 27, 1999 a workshop on Predicting the Performance of Concrete Repair Materials was held at the New England Conference Center in Durham, New Hampshire. This workshop was a follow up of a previous workshop held in 1995 at the National Institute of Standards and Technology which dealt with research needs to minimize cracking in concrete repair materials. The focus of the 1999 workshop was on test methods and modeling techniques for predicting the performance of concrete repairs. The two-day workshop included a half-day of presentations to define the problems and review current knowledge. The presentations were followed by working group sessions on the following topics: (1) modeling material performance; (2) repair design, specification, and application; and (3) repair materials and systems. The conclusions of the working groups were presented at a plenary session on the second day. The workshop concluded with recommendations for action. This report provides summaries of the working group discussions and concludes with the recommended actions.
Abstract. The prediction of early age behavior of cementitious materials is of particular importance when it comes to the prediction of the crack occurring risks. Amongst the most important parameters that define the hydrating material are its elastic properties and the changes in volume that arise due to the very reaction of hydration. On a discrete generated microstructure, a percolation -type approach is applied. A forest fire algorithm allows taking into account the binding role played by the hydrates, and it reveals a threshold of hydration below which the rigidity of the concrete is negligible. The evolution of elastic characteristics is obtained by using a homogenization method applied to the percolated microstructure. Autogenous shrinkage is assumed to be due to the rise of a capillary pressure, the latter itself being a consequence of the hydration reaction. The capillary pressure is obtained from a model for desorption isotherm and is applied to the deformable skeleton corresponding to the percolated microstructure. Using this approach and Biot's theory, it is possible to compute the autogenous shrinkage and its evolution around the threshold of percolation.
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