The paper presents results of strength tests selected low-density polyethylene (LDPE) building films with various thicknesses, including the assessment their surface microstructure before and after failure use digital scanning electron microscopes. Films came from one manufacturer encompassed: vapor-proof construction films. A significant correlation between film thickness tensile was found only for Increasing by 1 μm increases value 0.14 MPa on average when stretching in both longitudinal...

Abstract This paper provides a thorough investigation of heat conduction problem that pertains to tolerance modelling in layered materials made up multiple components. These media are functionally graded and thus have varying properties affect their effectiveness. The proposed equations explain the composites. formulation involves partial differential equations, which utilise smooth slowly functions. Notably, an extension unified procedure is presented generalising existing models for...

Recent advancements in sustainable building practices include the integration of waste materials from various industries into construction materials. This approach is currently being evaluated, allowing us to view recycled material not as but a valuable resource and raw material. Such an involves viewing this separate with its own distinctive properties. article investigates use environmental safety perlite-based concrete. The research focuses on properties immobilizing potentially toxic...

In this paper a study of the mechanisms destructive effect acid on concrete tanks used farms is presented. It analyzed extent and type damage that occurred demonstrated possibility preliminary detection problem also using unusual test methods such as surface morphology tests SEM microstructural analysis. The experiment focused exposing 10% acetic to cubic samples ordinary different W/C ratios. Samples were immersed in for 270 days. compressive strength mass loss then determined, was with...

Concrete is a highly alkaline material; therefore, the presence of organic acids (acetic, butyric, lactic) from agricultural sewage constitutes threat to concrete and environment. The investigations were aimed at simulating influence concentrated on elements livestock buildings. Cubic samples 100 × mm ordinary immersed in 10% acetic acid for 270 days. Then, compressive strength mass decrement determined as well using SEM images 3D-profilograph profile surface roughness depth changes evoked...

A Passive House (PH) system is not only an opportunity but also a necessity for the further development of sustainable eco-buildings. Construction foundation in energy-efficient houses key to maintaining low energy losses. The appropriate selection building materials requires considering thermal conditions environment, including its location and zero isotherms ground. main objective this work analyze possibilities designing foundations PHs Poland, according current methodological data. In...

The construction sector, a significant consumer of energy, possesses the potential to realize substantial environmental and economic advantages through adoption innovative technologies design approaches. Notably, Passive House standard, exemplified by energy-efficient single-family homes, emerges as prominent solution. This study analyzes five external wall systems across multiple stages: (i) literature review examination techniques within passive utilizing Database; (ii) material...

The paper presents results of investigations compressive strength and shrinkage concrete samples made on the basis Portland cement CEM I 32.5R, after 2, 7, 14, 28, 90, 365 days maturation in four different conditions. It was shown that 28 cured according to standard cuvettes with water achieved highest strength, although early-age strengths 7 14 were lower than those for building film dry A determined correlation between proves wet curing also allows a total elimination first days. Along...

In recent years, because of the continuous expansion urban areas, an increased necessity to isolate historically polluted sites by means artificial, flexible, low-permeability barriers has emerged. Moreover, due cost and efficiency considerations, various combinations materials that fulfill previously stated requirements have been proposed. On basis a literature review, this paper analyses relationships between water, cement, bentonite, physical mechanical properties resulting material...

Nowadays, much of the attention paid to building construction is focused on sustainability and environmental protection. The materials applied in should be safe free toxins, but they also follow idea circular construction. Quests for with an appropriate structure composition, unifying features a construction, insulation (thermally acoustically), environmentally friendly material turned our this paper toward expanded perlite (EP). This study aimed analyze results experimental determination...

Abstract The paper presents a new method of modelling for certain microlayered heat conductors. So far the main attention related to composite materials with deterministic structure was mainly restricted periodic composites (Bensoussan, Lions, and Papanicolaou [1]). future presented approach is that it can be also applied class non structure. These structures by referred as functionally graded in direction normal interfaces between layers. At same time non‐homogenous material slowly varying...

The topic of this study is the first mode natural transverse vibrations isotropic, homogeneous and elastic bars (columns or beams) with clamped bottom free head. columns group are shaped as truncated solid cones tubes linearly variable wall thickness different inclination lateral faces, from cylinder to cone. second were in similar way, but generatrices solids revolution curvilinear ?in shape a parabola. frequency was determined using Rayleigh method. deflection line column axis during...

In this article the structural features of friction pairs brakes are analyzed. Heat transfer processes with new boundary conditions described analytically addition flow and appearance a thermal layer to convective heat transfer. The joint action conduction convection fields is presented. release during due destruction adhesive bonds in actual contact zones, stress–strain state micro-roughnesses. It should be said that presence accompanying processes, complex much more compared purely...

Abstract This paper presents the results of a study on compressive strength, weight loss, surface roughness, elemental analysis and ultrasonic pulse velocity (UPV) measurement after 270 days seasoning concrete cubes measuring 100 × mm in solutions sewage from post‐grit chamber as well activated sludge three different environments, that is, acidic, neutral, alkaline. The value strength samples stored tested environments varied depending type wastewater its pH relation to control sample. most...

Abstract The present study aims to analyse a two-dimensional problem of displacements in theory thermal stresses for multicomponent, multi-layered periodic composites. model equations are obtained within the framework tolerance modelling procedure. These allow determine distribution caused by temperature field stresses. paper presents an example solution boundary value problem.

Metodą Rayleigh'a wyprowadzono wzory na częstość (lub okres) dla pierwszej postaci drgań własnych (giętnych) słupów wspornikowych w kształcie ściętego stożka o różnych zbieżnościach ścianek bocznych, z materiału jednorodnego i sprężystego.Przyjęto, że kształt wychylenia osi słupa podczas odpowiada ugięciu statycznemu pod działaniem obciążenia ciągłego.Uwzględniono trzy różne rozkłady obciążeń ciągłych.Otrzymane okresy porównano wynikami uzyskanymi metodą elementów skończonych (ANSYS

The Rayleigh's method can be used to determine the first natural frequency of bars (beams or posts) with non-uniform cross-section.The authors have analysed slender made an elastic material and having shape a solid revolution: curvilinear truncated cone conical pipe.It has been assumed that bar axis deflected during vibrations beam by static constant continuous load.The applied in paper aim free (transverse) posts formed as cantilever hollow generatrix being parabola which is convex relation...

The object of the analysis is a two-dimensional elastostatic problem for multicomponent, multilayered periodic composites. equations equilibrium this composite are obtained within framework tolerance modelling procedure. paper presents two examples solutions boundary value problems.

In the article, following issues are considered: general principles of complex heat transfer in friction pairs brake devices; radiant exchange from rough surfaces metal elements brakes; combined action fields thermal conductivity and radiation brakes. The role dynamic boundary layers resulting air-washing brakes with open their effect on cooling is discussed. A new relationship between Biot Nusselt criteria shown, which presented form resistances surface near-surface pulley rim. comparison...