Applied Mechanics and Materials Vol. 835

Abstract: The evaluation of the quality of the fibrous filler, which is part of stabilizing additives for the production of stone mastic asphalt concrete, can be carried out on the basis of researching its structuring role to a binding material, which was studied by the following parameters: the depth of needle penetration, elongation at 25 and at 0°C, the softening point, cohesion, elasticity and plastic strength. It is found that the fiber made of high-density microporous cellulose-paper waste have the highest adsorption activity and structuring capacity to the organic binder. Moreover, the adding fiber in amount of 1% of the initial bitumen weight allows forming the more rigid framework of the "tar - cellulose fiber" system, which corresponds to the introduction of 0.5% of stabilizing additive to the stone mastic asphalt mix (SMAM), that is, the amount close to recommended regulations.

Abstract: The society lays stress on today's buildings, particularly in terms of energy-efficient buildings and ecology of buildings. Accordingly, not only from a technical technical point of view, it is important to give sufficient attention to the foundations of building. The popular way of foundation of lightweight buildings is due to the growing interest in timber houses the foundation above a ventilated air gap so called Crawl Space. The article deals with the temperature and humidity field which is located in the air gap under the construction of wooden building in the climatic conditions of the Czech Republic.

Abstract: Dynamic collapse analysis is an important research subject for large span single layer reticulated shell structures. In this paper, the dynamic collapse behavior of the single layer reticulated shell with substructure which support the reticulated shell are investigated under the earthquake actions. In the analysis, the geometric imperfections, the material and the geometric nonlinear of the structures are considered. The effects of different stiffness of substructure to the collapse earthquake accelerations and the plastic member distribution of the reticulated shell are investigated.

Abstract: The coupled systems of fatigue crack initiation problem undergoing large range damage is defined. The zero different work principle, coupled potential energy principle, coupled complementary energy principle in the coupled system is established. By using of coupled potential energy principle, Closed form solution about predicting fatigue crack initiation life of three-dimensional component which leads to large range damage is derived. Compared with reference [1], the close form solution derived from this some. It is proved that the method is correct. The method adopted in this paper is definite in mechanical concept,it can be widely used in analysis of predicting fatigue crack initiation life of various component which leads to large range damage.

Abstract: With the development of building material technology nowadays, the demands to accelerate the working time is a must, and therefore many alternative building materials that can be used, one of which is the EPS (Expanded Polystyrene Panel). The use of EPS makes the construction work would be easier and quicker. For example, the process of making the stairs in the building could use EPS as an alternate material. The aim of using EPS is to accelerate the process of work, save time, and efficiency of implementation without reducing the built quality itself.

Abstract: In order to study the influence of freezing-thawing cycles on shear strength of seasonal frozen soil in northeast China, silty clay, typical soil in Jilin region, was selected. 20 groups of specimens were carried out by quick shear tests considering soil water content and the number of freezing-thawing cycling. The test results indicate that soil cohesion presents the slight fluctuation with the increase of water content, and the maximum value reaches around the peak of liquid limit. Internal friction angle of soil shows the sharp drop and the extent changes between 40% - 60%. The soil cohesion gradually declines with the increase of the number of freeze-thawing cycling. Therefore, the effect of the first freezing-thawing cycle on soil cohesion is obvious, and cohesion gradually tend to be stable after 7 freezing-thawing cycles. The final value of cohesion is approximate a third to a half of the unfrozen soil. The internal friction angle of soil increases with the augment of cycling number of freezing-thawing, which is related to the water content. The higher water content will bring about the greater growth rate of friction angle.

Abstract: The article shows the results of studies on the effect of calcium silicates-based fillers on the properties of coatings based on dry building mixes. The authors propose a mathematical model of the influence of water-lime ratio, filler ratio and filler synthesis conditions on the compressive strength of lime composite.

Abstract: A set of concrete tensile creep testing apparatus was constructed. The tensile creep characteristics of concrete under different loading ages (1d, 3d and 7d), different water-binder ratio (0.29, 0.33 and 0.37) and different fly ash proportion (0%, 20% and 40%) were researched. The results show that tensile creep increases with increasing of water-binder ratio obviously as well as with decreasing of loading ages. The tensile creep is inhibited by addition of fly ash, and the inhibition effect increases with the increase of fly ash proportion. Free shrinkage is counteracted 42%~62% by tensile creep. The internal tension of concrete is effectively relieved so that the possibility of cracking of concrete is decreased at early ages.

Abstract: The paper is aimed at storing heat with gravel. During testing, we used various kinds of recycled aggregates, were studied their characteristics and suitability for ground heat storage. The most important feature is the specific heat capacity which was measured through own construction of the calorimeter. The construction of the calorimeter and measured results are summarized in this paper.

Abstract: The most modern methods are used for study of alkali-activated material nowadays. Due to structure of these materials which is less structured most of these methods provide only limited information. Thermal analysis is partially applicable to alkali activated materials based on blast furnace slag. The article describes the application possibilities of thermal analysis to the study of thermal transformations of these materials and their applicability to the description of the tested structure.