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View article: Influence of metahalloysite on mitigating alkali-aggregate reaction in concrete
Influence of metahalloysite on mitigating alkali-aggregate reaction in concrete Open
The durability of concrete structures can be compromised by alkali-aggregate reaction, a chemical process between the alkalis and reactive minerals within the aggregate. The reaction produces a gel of hydrated sodium-potassium-calcium sili…
View article: The action of hydrated lime on the durability of energy-efficient asphalt concrete
The action of hydrated lime on the durability of energy-efficient asphalt concrete Open
The main priority in road construction is to reduce the energy consumption in the production of mineral-asphalt mixtures used for the upper layers of pavement structures. The most effective technology in this regard is the use of water-foa…
View article: Physical and mechanical properties of meta-halloysite-based geopolymer mortars
Physical and mechanical properties of meta-halloysite-based geopolymer mortars Open
Geopolymers are amorphous materials produced by the polymerisation reaction between an aluminosilicate precursor and an alkaline reagent or by activation with phosphoric acid. The aluminosilicate raw material used in the manufacture of geo…
View article: Effect of synthetic zeolite on tobermorite synthesis
Effect of synthetic zeolite on tobermorite synthesis Open
This paper presents the results of a study of the effect of synthetic zeolite addition on the formation of tobermorite in a burnt lime-quartz mixture. Synthetic zeolite was obtained by thermal activation of halloysite followed by boiling i…
View article: Influence of the aggregate type on delayed ettringite formation
Influence of the aggregate type on delayed ettringite formation Open
The studies carried out aimed to define the influence of the aggregate type on the simultaneous occurrence of the alkali-silica reaction and delayed ettringite formation. In their composition, sand or calcium aggregate and aggregates conta…
View article: THE MICROSTRUCTURE AND PHASE COMPOSITION OF MORTARS FROM THE 17TH CENTURY SACRED BUILDINGS
THE MICROSTRUCTURE AND PHASE COMPOSITION OF MORTARS FROM THE 17TH CENTURY SACRED BUILDINGS Open
This work aims to characterize the microstructure of mortars derived from the walls of sacred buildings from the 17th century. The tests were carried out using the X-ray diffraction method, differential thermal analysis and scanning micros…
View article: Microscopic methods for analysis of mortars from historical masonry structures
Microscopic methods for analysis of mortars from historical masonry structures Open
The process of historical building conservation includes the repair of mortars eroded due to material and environmental factors. Identification of old mortar constituents is necessary to enable duplicating the material. Information on the …
View article: Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology
Properties of a Three-Component Mineral Road Binder for Deep-Cold Recycling Technology Open
This study examined the physical properties of a three-component mineral binder that is typically used in deep-cold recycling. Test binders were produced using Portland cement, hydrated lime, and cement bypass dust (CBPD) as a byproduct de…
View article: Testing the cement, hydrated lime and cement by-pass dust mixtures hydration
Testing the cement, hydrated lime and cement by-pass dust mixtures hydration Open
The paper reports the results of the tests used to determine hydration kinetics, physical properties and microstructure of hydraulic road binders. Seven hydraulically bound mixes were produced by mixing Portland cement (CEM I 32.5R), hydra…
View article: Hydration of cement by-pass dust
Hydration of cement by-pass dust Open
Cement kiln dusts (CKD) generated during the production of Portland cement clinker differ markedly in composition and, hence, in properties. These dusts are commonly used as an addition to cement. In this article the way in which the selec…
View article: The use of lithium compounds for inhibiting alkali-aggregate reaction effects in pavement structures
The use of lithium compounds for inhibiting alkali-aggregate reaction effects in pavement structures Open
Internal corrosion of concrete caused by the reaction of reactive aggregate with sodium and potassium hydroxides from cement is a threat to the durability of concrete pavements. Traditional methods for reducing the negative effects of the …
View article: THE EVALUATION OF THE EFFECT OF CHALCEDONY DUST ON THE REACTION OF ALKALIS WITH REACTIVE AGGREGATE IN CEMENT MORTARS
THE EVALUATION OF THE EFFECT OF CHALCEDONY DUST ON THE REACTION OF ALKALIS WITH REACTIVE AGGREGATE IN CEMENT MORTARS Open
Chalcedony dust can be used as a mineral additive in cements and concretes.This material can act as a pozzolan and prevent the expansion caused by the alkali-silica reaction.The paper presents the examination of cement mortars with reactiv…
View article: The impact of lithium nitrate on the physical and mechanical properties of Portland cement)
The impact of lithium nitrate on the physical and mechanical properties of Portland cement) Open
The effectiveness of lithium nitrate as a chemical additive which reduces the negative effects of alkali aggregate reaction was subject to research by scientists in many centres around the world. The literature data on the impact of lithiu…
View article: Chemical corrosion of external stairs – case study
Chemical corrosion of external stairs – case study Open
On the basis of examinations of the efflorescences formed on the concrete surface, an attempt was made to analyze the sources of concrete corrosion without entering inside the construction. The concrete stairs revealed the symptoms of leac…
View article: Effect of lithium nitrate on the reaction between opal aggregate and sodium and potassium hydroxides in concrete over a long period of time
Effect of lithium nitrate on the reaction between opal aggregate and sodium and potassium hydroxides in concrete over a long period of time Open
Alkali-silica reaction (ASR) is a reaction between amorphous or poorly crystallized siliceous phase, present in aggregates, and sodium and potassium hydroxides in the pore solution of concrete. Chemical admixtures such as lithium compounds…
View article: Effects of Bentonite Additives on Autoclaved Sand-Lime Product Properties
Effects of Bentonite Additives on Autoclaved Sand-Lime Product Properties Open
The paper presents the results of the research on modifications of sand-lime bricks with bentonite additives. The article presents correlations between physico-mechanical properties and a microstructure of traditional silicates and product…
View article: Analysing the Pozzolanic Reactivity of Chalcedony Dust in Cement Paste
Analysing the Pozzolanic Reactivity of Chalcedony Dust in Cement Paste Open
The considerable energy consumption and greenhouse gas emissions in the production of Portland clinker makes it extremely important to use substitutes in the form of mineral additives. Chalcedony dust, being a natural mineral raw material,…
View article: Influence of Exposure Conditions on the Efficacy of Lithium Nitrate in Mitigating Alkali Silica Reaction
Influence of Exposure Conditions on the Efficacy of Lithium Nitrate in Mitigating Alkali Silica Reaction Open
Lithium nitrate is known to have the highest potential to inhibit alkali silica reaction in concrete. It is well soluble in water and does not increase the pH of concrete pore solution. The extent to which the alkali silica reaction is mit…
View article: The role of lithium compounds in mitigating alkali-gravel aggregate reaction
The role of lithium compounds in mitigating alkali-gravel aggregate reaction Open
Alkali reaction with reactive aggregates is an example of concrete internal corrosion. Cracks and damage to elements of a concrete structure are the result of the formation of an expansive alkali-silica gel. One of the ways to minimise the…