This study addresses the issue of resistance to high temperatures lightweight concrete lightweighted with sintered fly ash aggregate. Lightweight concretes different amounts lightweighting and their properties after loading 600, 800 1000 °C were investigated. In particular, effect temperature on mechanical was determined test specimens, microstructure investigated by X-ray diffraction analysis scanning electron microscopy. It found that there is an increase in compressive strength between 0...

The comparison of really measured compressive strength static modulus elasticity with table values stated in Eurocode 2 is essential part the paper. Since standard draws from - concrete class, set strengths will be classified particular classes. Experimental was based on several design compositions differing input raw-materials. Monitored were concretes different ages final value 180 days. experiment tries to demonstrate impossibility derivation which do not match present-date produced concretes.

The paper is concerned with assessment of blended cement high proportion in mix design concrete. A long term development concrete compressive strength and static modulus elasticity were monitored. reached even 450 kg per m 3 was used aim to obtain declared values for the given class according EN 1992-1-1. And just influence positively verified long-term both monitored parameters.

Cement-bonded particleboards merge the good properties of wood and cement; they are board materials with which pre-determined for use in many different cases case construction walls partition walls, lower ceilings, facades, floors, etc. The disadvantage cement-bonded is relatively high price mainly derived from input materials. main component creating filler wood. Wooden chips produced tree trunks cut trees mean that, first all, it necessary to produce wooden substance. By using alternative...

Production of SCC concrete involves using a higher amount fine particles consisting primarily increased amounts cement and one or more admixtures. Due to the economic performance Portland cements, recently looking for ways lower environmental burdens. The first production was recommended only cements CEM I. Now, standards EN 206 specify such requirement therefore attempt use II This paper points out possibility blended in combination with admixtures particular monitors rheological properties...

The paper presents results of mechanical and physical tests self-compacting concrete with fibre reinforcement. Self-compacting concretes belong to special types filling ability without invoking external dynamic forces. Especially high storage rate access even in densely stored reinforcement, homogenisation, low water-cement ratio exclusion vibrations are benefits SCC concretes. highest risks that must be considered when designing this type the their resistance segregation, sedimentation,...

The new possibilities of testing resistance surfaces cement composites includes action fast-water abrasion.Several types surface damage caused by fast-flowing water are described on different type structures.The focus is abrasion fast flowing carrying solid particles.The second part describes an experiment in which tested using a ultrasonic cavitation method, simulates the abrasive effects water.

The production of lightweight concrete is mainly carried out in the traditional way using ceramic aggregates. aim pilot research was to verify possibility producing based on artificial aggregate form agglomerated from high temperature fly ash. A representative such referred as aploporite. This characterised by comparable grain strength aggregates but, other hand, has a relatively absorption rate up 30 %. Concrete formulations with 50% replacement natural aploporite have been proposed order...

The paper presents obtained results of self-compacting concretes with various compositions focus on basic characteristics development. Firstly the fresh concrete properties are summed and self-compactness classes categorised subsequently values compressive strength, static dynamic modulus elasticity hardened compared. All stated parameters were monitored during different ages therefore they provide a view its development in time. With still enlarging scale types their application it is...

The article discusses the physical mechanical concrete properties of five different recipes. objective composition is to use lowest quantity Portland cement by adding additives (fly ash, slag and limestone) various combinations.

The modulus of elasticity is one the most important properties concrete in terms elastic behaviour a construction. This parameter used for estimation construction deflections and assumption serviceability calculation deformation. paper summarises parameters which have essential influence on development physical mechanical mainly its elasticity.

The paper is involved with effects of admixtures (fly ash, slag) and their combination on selected properties ordinary concrete. set concrete covers seven different containing Portland cement approximately 10% admixed slag fly ash contents up to 42 %. At early age the balanced values compressive strength were obtained except admixture combinations. And contrary at 28-day combinations comparable like only one type admixture. was monitored together modulus elasticity 180-day In last phase...

This contribution describes the possibilities of UHPC concrete production. To begin with, fundamental characteristic this concrete, its development and composition are provided. An essential element for achieving extraordinary properties is composition. The experimental part design, test examples testing certain compressive strengths tensile bending strength after 1 28 days. Simultaneously, basic buildings in Czech Republic mentioned.

The filling material is made up of technical Cannabis shives, hydraulic or air binders and other components. They are suitable for use as fillers in horizontal vertical wooden structures such rack systems. Thanks to its good thermal-insulating properties the filler may be used thermal insulating walls floors. article describes behaviour padding materials secondary raw replacement part joiner component. (such fly ash, fluid classical slag), however, conditioned by maintenance same, at least...

The circular economy is currently a highly discussed topic in many areas of production, due to the potential scarcity natural resources. In construction sector, it often associated first place with high shortages aggregates for production concrete. To produce concretes up strength classes C 30/37, partial or complete replacement by concrete brick crushed recyclates 4/22 mm fraction can be used very efficiently and safely. This paper will show current legislative limitations use as...