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Monitoring moisture movement within modified concretes
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Dissertation
Monitoring moisture movement within modified concretes
1997
Overview
The current work presents the results of a study into moisture movement within the surface region of concrete containing supplementary cementiceous additions (modified concrete). Samples were subjected to cycles of drying and wetting to study the influence of binder type, curing regime, and water/binder ratio on drying mass loss, cumulative volume gain during infiltration, internal relative humidity and electrical conductivity profiles within the surface 100mm. Binder types included plain OPC and OPC partially replaced with PFA, GGBS, Microsilica, and Metakaolin at water/binder ratios of w/b=0.4 and w/b=0.6.A brief review of non-destructive, in-situ durability test methods developed for use with concrete is presented, and relevant moisture transport theory regarding drying and infiltration is discussed. The background to electrical testing is discussed and developed.A number of conclusions are drawn regarding the influence of test parameters on the sorptive properties of concrete, and results illustrate the useful insight discretised electrical measurements can provide into the distribution and movement of moisture within the cover region. Electrical profiles are used to monitor the depth of influence of infiltration cycles and zone of influence of drying action. Regarding the latter, data are found to compare favourably with relative humidity measurements. The electrode response during infiltration is examined and the influence of the wetting-front shape is discussed. The relationship between resistivity and degree of saturation was studied for both concrete and mortar. Results are presented which allow in-situ estimates of degree of saturation profiles during a 24 hour infiltration test.The testing methodology was then extended to study a surface treatment (silane). Monitoring electrical conductivity through the surface region allowed measurement of the depth of penetration of silane treatment, and showed that although infiltration is reduced, drying moisture profiles were not measurably influenced by silane application.
Publisher
ProQuest Dissertations & Theses
Subject
