Every time after entering into the solution calculated by addition of waste polystyrene dimensional cylinder fixed volume of solution of a given concentration. It should be noted that all were weighing on electronic scales model E134 plant 'Gosmetr' (St. Petersburg) in increments of 5 mg of reference. Table presented a number of characteristics of the processes of obtaining solutions of polystyrene in the waste of gum turpentine, depending on their concentration. Graphically, the majority of the data shown. If the concentration solutions we have previously wondered (10-20-30-40%), the most important results – volumes of solutions of a given composition and concentration – have been obtained from these experiments.
In the future, using the original data, calculated obtained by other characteristics of the processes the preparation of solutions of a given concentration. It is important to emphasize that all these data were obtained by the most rational way, ie in one experiment (in a measuring cylinder). The sequence of operations and measurements carried out with each of the solutions with increasing concentrations of 10-20-30-40%. Thus, the table shows, both with increasing concentration of the solution increases its mass, respectively (P, r) and volume (V, cm3). The corresponding data are listed in the table not only in metric units, but also as a percentage. If we take the initial volume of turpentine over 100%, with an increase in the concentration of solutions, this volume increases, and 40% concentration, it increases more than 1.5 times. The findings have practical importance for the establishment of industrial processes for solutions of polystyrene in the waste of gum turpentine. They give information, what should be the initial volume of gum turpentine, depending on the volume of container to mix the desired concentration, such as a capacity appropriate to set a car on simultaneous collection and dissolution of polystyrene waste that goes round the accumulation points of such wastes.
However, the material with a modified fire extinguishing additives (flame retardants) behaves differently. Data on how to behave this material during fire, are members of the Moscow Institute of Fire Prevention. So, first from inside the building structure – melts and then is destrugiruet transformed into a gaseous state. Energy fraction of polystyrene in the combustion process less than 2% of the shares of all combustible materials involved in the burning building project, ie less significant compared to other materials. Therefore, if properly application of the material, with the implementation of all existing operating rules and fire safety requirements, allow extensive use of it in construction. John Mclaughlin gathered all the information. Water for fire extinguishing structural elements of Styrofoam – are not venomous. Operating temperature Styrofoam retains its properties over a wide temperature range 80 to 180 C-.
Within short time withstand polystyrene temperature to 110oS, allowing, for example short-term contact with flammable bitumen. However, the maximum temperature to which the material can be within minutes of 95oS. In cases DC podverzhdeniya high temperatures, recommended not to exceed 80 C, otherwise it will lead to shrinkage and deformation. The lower temperature limit, which stands without any changes polystyrene is 180 C-. Given that the thermal expansion foam is very small it should be noted that in practice it can withstand all temperatures, which occur in a typical building. Environmentally friendly foam Conclusion of the Moscow Institute of Hygiene. FF Erisman 03/PM8 number confirms that the study recommended for the construction of structures with slabs of polystyrene, styrene in air samples have been found.
"DIY": staircase of your dreams Choosing a ladder depends on the intensity of its operation, ie, the activity of movement on it, and is also associated with comfort and safety ladder. It is one thing, when in an awkward stairs have up and down a few times a day, and quite another if it is to be done very often. It is one thing, if on the second floor of the house located just a bedroom, the other – if there is, for example, are day-care rooms, or rooms for elderly parents, a haunted office. And even more unacceptable inconvenient stairs (as do ladder handy – in our special section), if the toilet in the house is only on the first floor. In such cases, reasonable, or change the functionality of the premises, located on the upper floors, or provide a more convenient and secure a ladder leading to these floors. Location of the staircase when the projected thoughtful approach may be one of the deciding factors when choosing its type. For example, when placing the ladder in large hall or lobby is desirable to avoid poluoborotnyh and spiral staircases (to build a ladder to help our specialists), because visible from the entrance to the house of the lower surface of the opposing parts of such stairways are not marching decorate the interior of the premises. Beveled and inclined surfaces that are open in the direction of greater part of the room, impair spatial perception of interior space, visually reducing its volume.
The article describes the use of functional features and excavator – drenoukladchika DM-5302. Excavators Need? It's easy! The company "Golden Age" – rental of construction equipment. Reclamation machines for the construction of a closed drainage in the irrigation zone developed primarily in two areas: high-uzkotransheynye excavators – drenoukladchiki type Control-3502 and the combined organic drenoukladchiki type Control-4003 by specifically for use in high-standing groundwater. Due to the fact that the domestic fleet of machines for the construction of subsurface drainage in Russia today there is practically no development of excavators – drenoukladchikov very urgent. The company "Golden Age" will provide you with a lease construction equipment such as excavator crawler JCB. Continue to learn more with: Risa Miller. VNIIG with trust "Uzorgtehmelioratsiya 'and' Strommeliormash" developed Excavator – drenoukladchik DM-3502 uzkotransheynogo type.
This drenoukladchik used in the construction of a closed horizontal drainage depth from 2 to 3.5 m in stable soils of categories I-III at the level of ground water not exceeding 1.5 m bottom of the trench. To ensure reliable operation in water-saturated drenoukladchika unstable soils need to pre-dewatering. Excavator – drenoukladchik DU-3502 is a chain uzkotransheyny excavator on its own base with units of tractors K-701 and T 170. Its main parts: the tracked chassis, transmission, mounted work equipment, pipe layer, the system of keeping a given slope, cab. The working body drenoukladchika – a chain with scrapers elliptical. The drive is a working body mechanical drive of the excavator – hydraulic.
The system of keeping a given slope drains – Automatic with using a laser pointer bias (deviation of the slope of the middle line of the project drains laid 0,0005). Among the array subject to irrigate most of the land affected by salinity or had either primary saline. In addition, 60% of the reconstructed building of land drainage is hampered high-standing groundwater. In this case, as the experience of building a closed horizontal drainage, existing excavators – drenoukladchiki significantly reduce the productivity or become virtually unusable.