The restoration of aging sewer networks is a fundamental remediation approach with the aim renewing or improving existing systems. Remediation methods include repair, renovation, and replacement (renewal). network itself can be performed using either excavation trenchless technologies. While these technologies offer various advantages, they also present disadvantages. choice technology depends on numerous parameters, including economic factors local conditions (such as construction sewage...

Alkali-activated systems (AAS) represent an ecologically and economically sustainable inorganic binder as alternative to ordinary Portland cement (OPC). One of the main benefits AAS is their durability in aggressive environments, which can be equal or even better than that OPC. In this paper, influence type alkaline activator alkali-activated blast furnace slag terms resistance sulfur dioxide corrosion was investigated. The testing process based on CSN EN ISO 3231 standard simultaneously...

The paper describes how a crystalline additive influences the properties of cement- based composites. investigation was focused on degradation mortars with exposed to selected aggressive environments. specimens were tested for compressive and flexural strength. influence microstructure is also discussed (high pressure mercury intrusion porosimetry, SEM, DTA). results confirmed positive values strength after exposure all

Artificial sintered aggregate produced by self-firing is one of the few building materials, which can be with only fly ash. If character ash optimal, no other additions are needed. However, not every has optimal composition. Quality then influences composition mix, technological parameters and quality aggregate. Parameters influence process self-firing, strength granules during phases drying process, ignition burning under given underpressure on an agglomerating bed. This often correct...

This article presents research on the behavior of cement-bonded particleboards under mechanical stress caused by static load. The composition boards was modified using alternative raw materials-dust (DU) forming during processing cement-fibre and particle mixture (PM) generated in production particleboards. (1-year-old) were subjected to an adverse environment (100 250 frost cycles). Mechanical parameters tested, development defects load bending analyzed acoustic emission. Particleboards...

The cement-bonded particle boards can be used among other also with reconstructions of various types buildings as a part final surface treatment. paper deals partial results the research focused on optimisation board composition alternative raw materials. Specifically it is analyzing basic parameters waste originating during processing (modification format and quality) boards. Upon findings design new formulas mentioned further, i.e. modified above stated waste. outputs presented in article...

The paper focuses on the study of parameters in newly developed polymer-cement mortars designed for applications environments with a potential stress by extreme temperatures. Recipes repair intended redevelopment steel-reinforced concrete structures were and tested.

The paper deals with problematics of the influence size and shape test specimens prepared according to valid standard procedures in comparison standards used for different types materials (grouts, coatings). aim this is verify possibility using non-standard specimen sizes reduce economic demands development building materials. issue tested on polymer composites three amounts filler. composite based epoxy resin serves as a representative homogenous material which achieves same results under...

This paper presents research on the hygroscopicity of wood-cement composites containing a by-product cement-bonded particleboard production. The behaviour and properties were analysed with respect to variable air humidity. intention was assess suitability alternative raw material used in terms volumetric changes. Emphasis also placed verification basic performance properties.

This paper presents research on the changes in properties of cement-bonded particleboard modified with particulate mixture (PM). PM replaced 4% binder (cement) and filler (spruce chips). The particleboards were tested for physical (bulk density, swelling, linear expansion due to relative humidity changes) mechanical (modulus rupture modulus elasticity). Development phase composition microstructure by XRD SEM also analysed. long-term behaviour wood-cement composites was studied over a period...

Combining air or hydraulic binders with hemp shives, we can gain a set of new building materials. These products achieve excellent performance characteristics for durable, environmentally sustainable buildings. Being together, these create natural composite material that be used to insulating elements walls, floors and roofs also thermal acoustic properties the Hemp insulation is created by connection technical shives binder consisting cement calcium hydroxide. The production process may...

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...

The use of rapidly renewable raw materials in the building industry is seen as very promising with regard not only to environmental issues but also its economic aspects. A number producers, this country, have been trying replace fine construction secondary or ones. As an example, technical hemp a material due good mechanical and thermal insulation characteristics. One possibilities filling component for non-constructional materials. Combining binders on basis non-hydraulic lime chaff yields...

The contribution deals with possibilities of using waste from the production stone wool for modification existing composition cement boards . Waste - fibres was used as an alternative to standardly wooden filler (chips, sawdust). tested in laboratory and then added mixture cement-bonded particleboards a substitute wood filler. physical mechanical properties laboratory-made modified recipe were monitored.

The paper discusses the possibilities of production external thermal insulation material from technical hemp bonded mixture cement, hydraulic lime and secondary raw materials. To verify applicability this as a heat-insulating, it was necessary to test its properties. basic characteristics are be determined bulk weight heat conductivity factor. Additionally also tested tensile strength in bending compressive strength. Based on measured properties decided evaluate an additional insulation.

This paper presents the results and findings of carbohydrate-content reduction wooden substances (particles) that are used as filler in cement-bonded particleboards. Several alternatives appeared potentially suitable were analysed. The aim research was to control carbohydrate level wood matter with regards their negative impact on speed course hydration reactions In experimental testing an/the attention particularly devoted washout chips by running water chemical hydrolysis with/by oxidizing agents.

This paper presents the results of research focused on modification composition polymer-cement mortars. The use these materials is quite wide. greatest can be found in production reinforced concrete repair materials. Specifically, article analyzes problems lightweight aggregate effect resistance mortars to extremely high temperatures. link particularly evident with risk fire. Attention was given two different types aggregates - from primary raw (Liapor) and alternative sources (fly ash...

The paper discusses the examination of suitability a newly proposed method for testing consistency fresh mixture cement-bonded particleboards (cement-chip boards) with modified composition. A modifier component was dusty waste – by-product from production and blast-furnace slag. is based on combination vibration static pressure defined mass. Within conducted research, we have found that this requires slight modification in order to be used more accurate assessment workability particleboards.

Production of artificial aggregate by clinkering process is currently relatively well-known way to efficiently use the potential fly ash for building materials. Principle can reduce cost natural gas and other external sources heat through own combustible substances. Course firing properties significantly depend on type character or mixture. Due high heterogeneity these materials difficult assess impact specific parameters (grain size, content Fe 2 O 3 , SiO CaO, amorphous phase, etc.)....

The paper discusses the development and study of properties lightweight repair materials applicable to re-profiling concrete. main objective in achieve best matter at maximum lightness ease application on re-profiled construction. basic formula has been derived from previously produced for concrete reinforced structures.