Effects of Separated Fractions of Fbc Bottom Ash on Selected Properties of Cement Mortars

This paper discusses the effects of partial replacement of cement with fluidized bed bottom ash on the properties of mortars. The analyzed ash samples originating from four Polish power plants were separated by grain size selection into fine and coarse-grained fractions. This process leads to a creation of derivative samples of differing physical properties and, partially, phase compositions, as tested in XRD and TG analyses. Despite its high water demand, the obtained fine-grained fraction has the potential for application in cementbased composites as a reactive, pozzolanic additive. An acceptable activity index may be reached when the sulfate content is limited, implying benefits of combining the ash with low gypsum cements. The coarse-grained fraction is significantly less reactive, while a high silica and aluminate content is related to improved mechanical properties of the composite. It can, therefore, potentially be used as a quasi-inert additive or a substitute for sand.

High-density polyethylene—an inert additive with stabilizing effects on organic field-effect transistors

The employment of binary blends comprising the insulating polymer HDPE in combination with hole- and electron-transporting organic semiconductors enables fabrication of OTFTs of notably improved device stability and performance.

Simple Evaluation of the Influence of an Inert Additive on the Swelling Characteristics of Clay Soil

In this study, an experimental investigation carried out to assess the performance of addition of an inert material on stabilization of an expansive soil in order to solve the lifting structures caused by this phenomenon. The results showed that an addition of glass is capable of reducing the actions of swelling. From the global analysis of the porosity using an ultrasonic device, we measure the propagation velocities of ultrasonic pulse through the tested clay samples. This reveals a change occurring in the porosity of the clay when glass is added to it. As a result some interesting conclusions concerning the expansive soil-material amendment are drawn.

MEANS OF THE ANALYSIS OF THE SHS PROCESS ON THE BASIS OF THE CHRONOGRAPHIC AND TOPOGRAPHIC PRESENTATIONS OF THERMAL IMAGING DATA

The paper presents the means for measuring the spatial and temporal coherence of temperature in the microregions of a wave of self-propagating high-temperature synthesis (SHS) and revealing the relationship between the events of ignition of individual foci. The method for determining the parameters of the thermal wave structure of the synthesis is based on the chronographical and topographical representation of micro- thermal data in the form of maps that visualize the ergodicity of the SHS process and facilitate the recogni- tion of individual foci of burning on thermal imaging images. The ergodicity of the phenomenon is used in the method to determine the time of induction of the combustion sites, the time of their growth, the growth rate of the foci tangentially to the front of the SHS wave, the size of the foci in the direction of the normal to the front. The technique is implemented in the form of software integrated into the original micro thermal imaging complex. Approbation of the method is represented by the results of experimental studies of the Ni + Al + NiAl system with a variation in the fraction and dispersity of the inert additive. The error in measuring the normal velocity of the SHS front of the wave with the proposed technique was 0.05 %.