This paper provides an overview of significant UHPFRC structures built in the Czech Republic over past decade. The use precast elements bridge construction has grown substantially during this period. accumulated knowledge design, production, and culminated publication new standard, TP 267, 2024.Additionally, offers a brief insight into research development advanced composite material, tracing its progression from laboratory studies to real-world applications. Concrete examples illustrate...

The research presented in this paper has been motivated by the need to numerically simulate performance of high strength fiber reinforced concrete (HSFRC) structural elements with given spatially variable volume fraction. intended applications include prediction load and deformation capacity HSFRC members imperfect distribution or design verification functionally graded members. In order achieve a predictive capability, modeling is based on micromechanics debonding, pullout crack-bridging....

The study explores the effect of elevated temperatures on bond strength between prestressing reinforcement and ultra-high performance concrete (UHPC). Laboratory investigations reveal that changes in correspond well with compressive UHPC their correlation can be mathematically described. Exposition specimens to up 200 °C does not reduce as a negative increasing temperature is outweighed by positive thermal increase reactivity silica fume mixture. Above °C, significantly reduces; for...

This article is summarizing technological and test influences on modulus of elasticity concrete presents in more detail results experimental measuring following influences: shape dimensions piece, method finishing pressing surface, level load. Not just its durability but also deformative characteristics have been coming to fore experts' interest during last years. One deformable each type concrete. Modulus part many static calculations has close relation other physical mechanical as are...

Fibre-reinforced composite materials are becoming important in many areas of technological application. In addition to the static load, such structures may be stressed with short-term dynamic loads or even impact during their lifespan. Dynamic effects can significant especially for thin-walled shell and barrier constructions. Impact loading construction components produces a complex process, where both characteristics design itself material parameters influence resultant behavior. It is...

Fibre-reinforced composite materials are becoming important in many areas of technological application. In addition to the static load, such structures may be stressed with short-term dynamic loads or even impact during their lifespan. Impact loading construction components produces a complex process, where both characteristics design itself and material parameters influence resultant behavior. It is clear that reinforced concrete fibers has positive on increasing resistance loads. Results...

Fibre-reinforced composite materials are becoming important in many areas of technological application. In addition to the static load, such structures may be stressed with short-term dynamic loads or even impact during their lifespan. Impact loading structural components produces a complex process, where both characteristics design itself and material parameters influence resultant behavior. It is clear that fibre reinforced concrete has positive on increasing resistance loads. Results two...

This article deals with the development of concretes intended to be used as construction materials in Czech deep repository for radioactive waste. The basic requirements this concrete are a reduced pH value, which must maintain constant value around 11 long term, and mechanical properties comparable conventional concrete. raw production proposed low come exclusively from Republic. Material characteristics were measured on fresh mixtures after 28, 56, 90 days curing. In addition (aggregate,...

The paper focuses on a computer nonlinear analysis of the formation and development cracks in concrete slab exposed to uniform continuous load lower surface. is based an actual example basement ground water buoyancy.

The Ultra High Performance Concrete (UHPC) is a very promising material suitable for application in special structures. However, the knowledge of performance this relatively new rather limited. exceptional mechanical properties UHPC allow modification design rules, which are applicable ordinary or high strength concrete. This paper deals more detail with impact thermal stress on bond between prestressing strands and an influence temperature to final different mixtures. Specimens first...

Outstanding features of UHPC - Ultra High Performance Concrete are generally known. It has become increasingly used worldwide. For a better understanding the material some like bond reinforcement and to be quantified. Research is focused on determination stress between two types (prestressing strands bars) different UHPC. Main goal research show significant increase in shear compared ordinary concrete. evaluation pull-out test were carried out. Specimens prepared according standard tested...

This paper is focused on properties of fresh and hardened cement-based composite Ultra-High Performance Concrete with regard to different volume fraction short brass coated steel fibers BASF MASTERFIBER® 482. Workability concrete basic mechanical (tensile strength in bending, compressive strength) UHPC were found out. The workability was measured by small mortar Haegermann cone. Percentage differences at cost obtained concrete, too. aim the first experimental part research impact according...

This paper deals with the comparison of results dynamic test and numerical modelling a road bridge across Dr. Kudela street in Rudná Ostrava. The is reinforced concrete structure, made post-tensioned KA-beams. On were verified material properties. Calculation model to validate static behavior structures was created. measured properties (frequency, mode shapes attenuation) during excitation construction by hydraulic vibration exciter. Article will focus on comparing calculation real structure...

This article present a mix design, preparation and production of thin-walled footbridge made from UHPFRC. In this case an experimental pedestrian bridge was design prepared. Bridge with span 10 m the clear width 1.50 designed as single-span bridge. Optimization UHPFRC matrix parameters material leads to very thin structures. Total thickness shell structure 30 - 45 mm. cast prefabricated element in one piece. Self-compacting character high flowability allows final structure. Extensive...

Research in the Ultra-High Performance Concrete applications field is very important. Current experiences shows that structure design should be optimize due to relatively new fine-grained cement-based Hi-Tech material with excellent mechanical and durability properties. It not sure if some of volumetric changes like creep or shrinkage has an impact on advantage for construction design. The effect common used concretes are well known described at publications but UHPC mostly unknown because...

Acceleration of bridge construction requires the development new methods. In composite steel concrete bridges cast in situ deck may be replaced by a precast deck. For fast assembly joints have to solved adequately. UHPC represent an alternative which can satisfy requirements on mechanical properties joints, and economy. The function was experimentally verified using three different experiments. performance beams with slab compared.

Simultaneous Thermal Analysis (STA) and Thermodilatometry (TDA) are done to reveal the structural chemical changes in UHPFRC during its high-temperature load. Based on measured results, several physical processes that studied material underwent at high-temperatures recognized. In temperature interval from 25 300 °C, liberation of physically bound water pores dehydration reaction C-S-H take place. Additionally, AFt AFm phases dehydrate 110 – 156 °C. Endothermic peat 460 °C corresponds...

This paper deals with the static and dynamic design of experimental footbridge for pedestrians cyclists in municipality Lužec nad Vltavou Czech Republic, Europe. work aims to familiarize reader calculations carried out results obtained, describing properties proposed footbridge. The construction is designed as a suspended structure prestressed bridge deck consisting prefabricated UHPC panels reversed "V" shaped steel pylon height approximately 40 meters. anchored using 24 hangers one row -...