Publication detail
Possibilities of K-Value Determination for Active Admixtures with Respect to Durability
ŠPERLING, P. HUBÁČEK, A. HELA, R. STARÁ, T. DVOŘÁK, R.
Original Title
Possibilities of K-Value Determination for Active Admixtures with Respect to Durability
Type
journal article in Web of Science
Language
English
Original 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 optimisation problem to determine the k-value so the difference between the actual measurement and calculated depth of pressure water seepage or carbonation was as small as possible. A high coefficient of determination of 0.9855 was achieved for the pressure water seepage depth function, but the coefficient of determination for the carbonation depth was lower.
Keywords
k-value; activity index; supplementary cementitious materials; fly ash; durability
Authors
ŠPERLING, P.; HUBÁČEK, A.; HELA, R.; STARÁ, T.; DVOŘÁK, R.
Released
12. 5. 2025
Publisher
MDPI
Location
BASEL
ISBN
1996-1944
Periodical
Materials
Year of study
18
Number
10
State
Swiss Confederation
Pages count
25
URL
BibTex
@article{BUT198088,
author="Petr {Šperling} and Adam {Hubáček} and Rudolf {Hela} and Tereza {Stará} and Richard {Dvořák}",
title="Possibilities of K-Value Determination for Active Admixtures with Respect to Durability",
journal="Materials",
year="2025",
volume="18",
number="10",
pages="25",
doi="10.3390/ma18102227",
issn="1996-1944",
url="https://www.mdpi.com/1996-1944/18/10/2227"
}