01744864

Component

https://doi.org/10.1177/0361198120917374

High early strength (HES) concrete patching materials are increasingly used to repair damaged pavements. The use of HES concrete enables the repaired pavement to be opened to traffic shortly after the repair has been installed; for example, opening pavements to traffic 4–6 h after the concrete is placed is becoming more common. HES concrete mixtures are typically designed with a low water-to-cement ratio and a high cement content; they contain accelerating admixtures and limited supplementary cementitious materials. As a result, these HES patches may be susceptible to self-desiccation, causing autogenous shrinkage and early age cracking. Self-desiccation can lead to reduced hydration, limited strength gain, and overestimation of strength development in maturity-based predictions. The objectives of this study are threefold. First, the paper will illustrate how self-desiccation can lead to the premature cessation of hydration and increased potential for shrinkage cracking. Second, the paper will illustrate how maturity-based predictions can be modified to account for self-desiccation. Third, internal curing is discussed as a way to mitigate self-desiccation and shrinkage ultimately improving the performance of HES concrete patching materials.

The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented. The contents do not necessarily reflect the official views and policies of the Indiana Department of Transportation or the Federal Highway Administration. The paper does not constitute a standard, specification or regulation. © National Academy of Sciences: Transportation Research Board 2020.

English

pp 12-23

2020-8

Transportation Research Record: Journal of the Transportation Research Board

Web

References (61)

Concrete; Concrete curing; Concrete pavements; Cracking; Durability; High early strength cement; Patching; Shrinkage

Highways; Maintenance and Preservation; Materials; Pavements

TRIS, TRB, ATRI

Jul 2 2020 3:05PM