Possibilities of K-Value Determination for Active Admixtures with Respect to Durability
Petr Šperling, Rudolf Hela, Adam Hubáček, Tereza Stará, Richard Dvořák
TL;DR
This paper explores how to calculate k-values for concrete admixtures by considering durability factors like water penetration and carbonation depth.
Contribution
The study introduces a method to determine k-values by incorporating durability factors, which were previously ignored.
Findings
A mathematical model using regression analysis was developed to calculate k-values based on durability factors.
The model achieved a high coefficient of determination (0.9855) for water seepage depth but lower for carbonation depth.
Optimization techniques were used to minimize the difference between actual and calculated durability measurements.
Abstract
This paper discusses the possibility of determining k-values for active admixtures concerning durability factors such as the depth of penetration of water under pressure and the depth of carbonation of cement mortars with fly ash. The k-value considers the use of active admixtures in concrete when calculating the water/cement ratio and the equivalent amount of binder. Currently, only the effect of the active admixture on the compressive strength of concrete and cement mortars is considered when determining the k-value, but not the effect of the active admixture on durability. To account for the influence of durability factors on the determination of the k-value, the mathematical functions of the property, dependent on the water/cement ratio and the age of the cement mortar, were constructed using regression analysis. From the determined functions, it was then possible to use an…
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Taxonomy
TopicsConcrete and Cement Materials Research · Concrete Properties and Behavior · Innovative concrete reinforcement materials