In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Moisture Transport and Shrinkage Stress in Polymer Based Repair Materials
Author(s): M.K. Rahman
Publication: Special Publication
Appears on pages(s): 1-22
Keywords: Polymer-based repair mortar, moisture diffusion, drying, shrinkage, moisture diffusivity, finite element, COMSOL, repair layer, shrinkage stress.
Abstract:Moisture transport, shrinkage and creep in repair material have a profound influence on long-term durability and serviceability of patch repair in concrete structures. In the process of drying of a newly cast repair mortar, the moisture diffuses within the domain and convects at the bounding surfaces resulting in hygral gradient across the depth and coupled drying shrinkage. This leads to the generation of tensile stresses in the repair layer, and cracks are developed at the surface of patch repair and at its interface with the parent concrete. Polymer-based repair materials also undergo significant shrinkage and tensile creep, which influences the stresses and cracking in the repair overlays. Experimental investigations including strength tests, moisture loss, shrinkage, and creep measurements were conducted on four selected repair mortar including two polymer-based repair mortars. These tests provide the parameters required for computation of stresses and prediction of cracking in repair overlays. Nonlinear finite element based diffusion analysis and experimentally obtained drying curves can be used to develop the empirical moisture diffusivity law and quantification of the surface transfer coefficient which is used for prediction of moisture loss in a repair layer. Multiphysics finite element software COMSOL provides a convenient tool for computation of moisture transport and associated evolution of stresses due to shrinkage in a composite system in which a polymer based repair mortar is used for patch repair of a concrete member.
Click here to become an online Journal subscriber