This paper deals with the possibility of using different types waste glass powder in high-performance concrete (HPC) mixtures as a fine fraction replacement. Subsequently, both fractions are used this research substitute for sand and silica flour. To use basic building material such concrete, it is necessary to verify chemical properties selected materials. Apart from properties, its environmental impact also appears be an essential property materials general. Therefore, mainly focused on...

This article deals with the possibility of utilization secondary-raw materials as a natural sand replacement in concrete. Four types waste construction were examined—recycled aggregate from four different sources. The was examined well used reference sample. All samples tested to evaluate water absorption, particle size distribution, and density. basic chemical reactions view ecotoxicology are investigated measured based on Czech standards. Chemical analysis, Lemna growth inhibition test,...

Abstract High‐performance concrete (HPC) is a cement‐based material with excellent properties and durability which determines high‐level structural utilization. However, the necessity of high‐quality natural resources such as quartz powder sand high amount cement silica fume reinforcement by fibers causes environmental footprint costs. One possible ways to reduce cost HPC/UHPC replace or secondary raw materials. In this study, two types three fractions fine recycled aggregate (fRCA) are used...

Recycling of materials such as masonry or concrete is one the suitable ways to reduce amount disposed construction and demolition waste (CDW). However, environmental safety products containing recycled must be guaranteed. To verify overall benefits concrete, this work considers ecotoxicity well potential impacts their life cycle. Moreover, related with carbonation considered in terms durability influence CO2 uptake. Concrete fine aggregate from two different sources (masonry concrete) were...

This paper deals with investigation of high-performance concrete (HPC) full replacement the silica powder by waste glass powder. The was replaced two types powder, originated from different sources (waste grinding jewelry and milling municipal glass). properties were examined compared mechanical durability three HPC mixtures experimentally verified. bulk density, flexural strength, compressive strength tested on beams 40 × 160mm at age 28 60 days after 0, 25, 50, 75 100 freeze-thaw cycles....

The use of recycled aggregate concrete is mainly negatively affected by its poorer mechanical and long-term properties. However, there are few structural applications for which aggregates can be used. In this case study, the possibility as massive external reinforcement wall verified. For application, most important characteristics freeze–thaw resistance, carbonation resistance then properties such compressive strength. Durability materials have been tested improved in study. durability...

The use of recycled masonry aggregate for concrete is mostly limited by the worse properties in comparison with natural aggregate. For these reasons it necessary to find ways improve quality and make more durable. One possibility utilization crystalline admixture which was verified this study laboratory measurements key material durability. positive influence mineral proved freeze-thaw resistance. impact carbonation resistance not unambiguous. In conclusion, evaluation shows how durability...

The main goal and novelty of this study is to show the transferability practices experiences with use reclaimed sand worldwide in case two different regions, Czech Republic India, which necessary for both regions due availability (Czech Republic) illegal mining including criminal offences (India). Due deteriorating environmental impacts associated mining, finding substitution possibilities natural becoming more important worldwide. It realized that reuse construction demolition waste...

This paper presents research results of recycled aggregate concrete testing. The main aim this contribution is the verification physical and mechanical properties durability concretes where natural replaced by masonry originated from construction demolition waste. mixtures contain various amount cement have a different water-cement ratio. influence to freeze-thaw resistance described. compressive strength flexural tensile were tested at age 28 60 days after 25, 50, 75 100 cycles. Cubic...

This study explores the potential of using fine recycled aggregate (FRA) to replace natural sand in concrete production. The research was divided into two parts. In first part, aggregate’s complete fraction (0‑4 mm) replaced with FRA conventional for strength classes. second individual components high-performance (HPC) were substituted a similar HPC and aggregate. physical mechanical properties these mixtures evaluated against reference that contained only aggregate, following European...

This paper deals with the current issue of use waste materials in high-performance concrete. Specifically, this work investigates glass from photovoltaic panels, which is examined terms chemical composition, optimization concrete mixture, experimental verification mechanical properties and durability mixtures, ongoing reactions are monitored. Thermal absorbability verified compared. During process optimizing attention paid mainly to alkali-silica reaction, can significantly disrupt samples...

This contribution deals with potential alkali-silica reaction in concrete full replacement of fine sand and silica flour waste glass (sand, powder). The chemical composition is verified the risk determined. research assumption eliminating due to utilization. Several principles alkali are summarized, methods testing ASR explained results pilot experiment evaluated. tested on specimens. values obtained after 1, 5, 9, 14, 21 28 days.

Abstract Research project is focused on the experimental verification of high-performance concrete (HPC) with full replacement fine fraction. This paper deals HPC mixtures containing recycled glass materials (waste powder from municipal waste, waste photovoltaic panels, grinding jewellery). The research based results previous student grant. A recipe that was made during 2017 used and optimized according to properties. influence different local sources monitored. are tested for mechanical...

The main aim of this paper was to optimize recycled aggregate concrete mixture with masonry for structural utilization find an efficient way construction and demolition waste utilization. This presents the characteristics concrete. mixtures were optimized according future use as element internal wall foundations. same type used a full replacement natural mixtures. Each had different amount cement various effective water-cement ratios. mechanical physical properties RMA concretes examined...

This contribution deals with the possibility to use waste vitrified tiles (VT) in high-performance concrete. Silica powder normally used concrete is replaced by 25, 50, 75 and 100 %. The basic experiments are tested, such as water absorption, flexural strength compressive strength. durability examined, freeze-thaw resistance tested freeze cycles. results evaluated compared reference concrete, containing silica powder. recipe of optimized based on these results.

This study is mainly concerned with the assumption that glass powder can eliminate potential alkali-silica reaction in high performance concrete. Glass often land filled, produced as a secondary raw material or by-product of production. Chemical analyses were carried out, and ecotoxicity was investigated, serving basis for testing reaction. High concrete (HPC) containing different types waste (secondary from production (SGP), jewelry (SGJ), container (CWG), used photovoltaic panels (GPP))...

With the growing consumption of primary raw materials, need for recycling construction and demolition waste (CDW) arises. According to international national regulations, any must be tested ecotoxicity using a leaching test followed by chemical analysis set aquatic toxicity biotests. Standardized procedures have also been developed materials products are used in common practice. On other hand, studies aimed at direct determination still lacking. Acute tests with unicellular algae, freshwater...

Stavebnictví patří mezi největší odběratele nerostných surovin, s čímž souvisí i následná produkce odpadů. Výroba nejvíce využívaných produktů v tomto odvětví, jako jsou například cihly a betony, je současné době závislá na neustálé těžbě primárních materiálů z neobnovitelných zdrojů. Značný potenciál pro ušetření zdrojů má ve stavebnictví opětovné využívání recyklátů. Pro využití odpadních náhrady určité složky betonu důležité, aby byly zachovány jeho mechanické chemické vlastnosti....

This paper discusses the feasibility of an innovative anchoring element which is designed to be integrated into volume ultra-thin coffered façade panel made textile reinforced concrete and not increase its external dimensions. The first part article describes composition shape focuses on manufacturing composite carbon technical penetrated with polymer matrix intentionally identical as in case reinforcement. second behavior effect surroundings during mechanical loading panel. Specimens...