Browsing Ústav chemie by Title
Now showing items 27-45 of 45
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Immobilization of Heavy Metals in Natural Zeolite-blended Cement Pastes
(Elsevier, 2016-09-26)This paper deals with the investigation of efficiency of natural zeolite-blended cement pastes for the immobilization of heavy metals. Natural zeolite was used to partially replace ordinary Portland cement (OPC) at rates ... -
Impedance spectroscopy measurement of metakaolin-based alkali-activated building materials
(IOP Publishing, 2020-12-18)Cement-containing as well as cement-free building materials are regarded as dielectrics. Therefore, electrically conducting admixtures are to be added to them in order to increase their electrical conductivity. Steel or ... -
Influence of rock inclusion composition on the fracture response of cement-based composite specimens
(Elsevier, 2021-11-20)This paper concerns the results of research into the influence of the composition of rock inclusions on the fracture response of cement-based composite specimens. Specially designed specimens of the nominal dimensions 40 ... -
Methodology for the quantification of concrete sustainability
(EDP Sciences, 2018-06-26)LCA is a method that evaluates the life cycle of a structure from the point of view of its impact on the environment. Consideration is given also to energy and raw material costs, as well as to environmental impact throughout ... -
Microstructure of biopolymer-modified aerial lime mortars
(EDP Sciences, 2020-10-14)Cellulose-based viscosity-modifying admixtures are used on daily basis in a wide range of building materials, dominantly in pre-mixed mortar systems. Lately, alternative admixtures such as different “gums” have emerged. ... -
Model uncertainty in diffusion coefficient for chloride ingress into concrete
(Elsevier, 2021-08-17)Diffusion coefficient for the chloride ingress into concrete is a key parameter describing the resistance against chloride penetration into the concrete. Consequently, it is an important aspect of the durability of reinforced ... -
Modelling of interfacial transition zone effect on resistance to crack propagation in fine-grained cement-based composites
(Italian Group of Fracture, 2017-07-03)In this paper, the attention is paid to investigation of the importance of the interfacial transition zone (ITZ) in selected fine-grained cement-based composites for the global fracture behaviour. This is a region of cement ... -
Mortars with Crushed Lava Granulate for Repair of Damp Historical Buildings
(MDPI, 2019-10-30)In this paper, crushed lava granulate was used as full silica sand replacement in composition of repair mortars based on hydrated lime, natural hydraulic lime, or cement-lime binder. Lava granules were analyzed by X-ray ... -
Optical performance of colored crystalline solar cells for building energy efficient application
(Elsevier, 2015-10-17)The optical properties of building materials belong to the features that are currently taken into account more frequently. There are various reasons for dealing with those parameters. Some of them aim to achieve specific ... -
Physico-Chemical Properties of Lithium Silicates Related to Their Utilization for Concrete Densifiers
(MDPI, 2023-03-08)Protection of concrete against aggressive influences from the surrounding environment becomes an important step to increase its durability. Today, alkali silicate solutions are advantageously used as pore-blocking treatments ... -
Rheological and mechanical properties of alkali-activated brick powder based pastes: effect of amount of alkali activator
(IOP Publishing, 2018-07-12)The rheological behaviour and mechanical properties of alkali-activated materials prepared by activation of a brick powder by alkaline solution (alkali + water glass) is presented in this paper. The effect of quantity of ... -
Rheological and mechanical properties of lime-brick powder mortars with expanded clay aggregate
(IOP Publishing, 2018-07-16)The rheological behaviour and mechanical properties of lightweight lime-brick powder mortars with combined expanded clay-sand aggregates are presented in this paper. The rheological investigation included the characterization ... -
Rheological characteristics of aerial lime-based pastes with addition of biopolymers
(IOP Publishing, 2018-07-16)Viscosity enhancing admixtures are widely used to improve the properties of concrete and ready-mix mortars. This study focuses on the influence of biopolymer (sodium salt of alginic acid, carrageenan, diutan gum, gellan ... -
Rheology of natural hydraulic lime pastes modified by non-traditional biopolymeric admixtures
(SCIENTIFIC SOC SILICATE INDUSTRY-SZTE, 2019-11-29)Viscosity enhancing admixtures, widely used to improve characteristics of concrete and ready-mix mortars, are mainly different derivatives of cellulose. Due to the nature of cellulose processing, the environmental-friendlier ... -
Salt and Ice Crystallization Resistance of Lime Mortars with Natural Lightweight Aggregate
(Scipedia, 2020-09-25)In this study, the comparison of lava sand, pumice, and natural zeolite as lightweight aggregate in air lime mortars, natural hydraulic lime mortars, and cement-lime mortars has been investigated with emphasis on the ... -
Self-sensing performance of metakaolin geopolymer with carbon nanotubes subjected to repeated compressive loading
(IOP Publishing, 2021-12-21)Alkaline activated binders showing enhanced piezoresistive properties have recently attracted increased interest in research of their application in smart self-sensing components. This study is focused on metakaolin ... -
Self-Sensing Properties of Fly Ash Geopolymer Doped with Carbon Black under Compression
(MDPI, 2021-08-04)The development of smart materials is a basic prerequisite for the development of new tech-nologies enabling the continuous non-destructive diagnostic analysis of building structures. Within this framework, the piezoresistive ... -
Ternary binder based plasters with improved thermal insulating ability
(IOP Publishing, 2017-10-25)New kind of plasters with improved thermal insulating ability are presented in this article. Improvement was reached by utilization of lightweight expanded perlite with high porosity. The second used aggregate was silica ... -
Thermal behaviour of metakaolin/fly ash geopolymers with chamotte aggregate
(MDPI, 2016-06-30)Geopolymers are generally appreciated for their good resistance against high temperatures. This paper compares the influence of thermal treatment with temperatures ranging from 200–1200 °C on the mechanical properties and ...