Physical properties of insulation materials based on straw and flax boon

Performance evaluation of environmentally friendly thermal insulation materials based on crushed straw and flax boon was determined by studying the physical parameters of thermal insulation in a climatic chamber and full-scale tests in buildings. In the climatic chamber at an air temperature of –20 °С, depending on the insulation moisture content, the thermal conductivity of the flax boon and straw slabs is 0.058 - 0.072 W/(m·°С), which is 27 - 31% lower than that of straw slabs equal to 0.08 - 0.105 W/(m·°C). With a relative air humidity of 50 - 95%, the moisture content of the flax boon and straw slabs varies within the range of 14 - 18.1% or less by 24% of the values of the crushed straw insulation. Under operating conditions, the thermal conductivity of the attic floor structure with flax boon and straw slabs corresponds to 0.07 W/(m·°C) at an air temperature of –20°C and is 22% less than the similar indicator of flooring with straw slabs equal to 0.09 W/(m·°C). A lower thermal conductivity of the floor structure with the use of flax boon and straw slabs provides an increase in temperature amplitude by 5 - 5.8 °C compared with the use of straw slabs. The results of studies in the climatic chamber and full-scale tests have confirmed the most effective operation of the flax boon and straw slabs as a thermal insulation material, which reduces energy consumption and, consequently, reduces financial costs for heating buildings

Features of the modified concrete strength in climatic conditions of the Middle East countries

ОСОБЕННОСТИ НАБОРА ПРОЧНОСТИ МОДИФИЦИРОВАННЫМИ БЕТОНАМИ В КЛИМАТИЧЕСКИХ УСЛОВИЯХ СТРАН БЛИЖНЕГО ВОСТОКА. М. ТЛАЙСС; канд. техн. наук, доц. А.А. БAKATOВИЧ (Полоцкий государственный университет)Discusses the results of the study to determine the effects of climatic factors in the Middle East countries on the strength of concrete. It was found complex positive influences on strength when increased the temperatures and humidity at the stage of curing concrete, which means allowing to increase the strength of concrete. The experiments were carried out on the modified concrete by superplasticizers that based on sulfonated naphthalene formaldehyde compounds, including applied in the Middle East. Production samples of concrete, stored and tested them is in according to operating normative documents in territory of Belarus and the American standards.= Рассматриваются результаты исследований по установлению влияния климатических факторов стран Ближнего Востока на прочность бетона. Установлено комплексное положительное влияние по- вышения влажности и температуры на этапе ухода за бетоном на прочность, позволяющее значительно повысить прочность бетона. Эксперименты проводили на бетонах, модифицированных суперпластификаторами на основе сульфированных нафталинформальдегидных соединений, в том числе приме- няемых и на Ближнем Востоке. Образцы бетона изготавливали, хранили и испытывали согласно действующим нормативным документам на территории Беларуси и по американским стандартам

Insulating material on the basis of bark fibre of the olive palm tree

The relevance of use of bark fiber of the oil palm tree for the production of effective heat-insulating materials is justified. Compounds of heat-insulating plates on the basis of bark fiber are picked up. Results of the research of the main physico-mechanical characteristics of the developed heater are given

Wood concrete based on crushed bamboo

The test results of wood concrete based on various raw wood materials are analyzed. Wood concrete, used as a coarse aggregate of a crushed bamboo, is described in the article as well as technologies for wood concrete, based on bamboo of high physical and mechanical properties, production

Thermal Insulation Material, Using Waste Cotton Production As a Placeholder

The results of investigations to determine the thermal conductivity of cotton fiber waste to be used as filler for efficient insulating materials are used in the article

Physical parameters of insulation with a structure-forming material from flax noils

The results of studies to evaluate the effective operation of the obtained thermal insulation slabs made of flax fibers or noils were carried out. The sorption moisture content of insulants based on flax fibers or noils with modified liquid glass was determined at a relative humidity of 40– 97%. The influence of humidity on the thermal conductivity of the test materials was studied. The coefficient of vapor permeability of insulation made of flax fibers or noils was established. The results of field tests of experimental thermal insulation materials on the attic flooring of a residential building during the cold season were considered. The graphs of the temperature distribution over the structure of the attic flooring and heat flow indicators were obtained. The values of the heat transfer resistance of the attic flooring were calculated at an air temperature of -20 °C to -2 °C. The moisture content of insulation at the end of the cold period was determined and the dependence of the distribution of moisture over the thickness of the thermal insulation layer was plotted. The results of the tests carried out indicate the highest efficiency of thermal insulation slabs made of flax fiber noils in comparison with insulants based on flax fibers

Insulating material on the basis of bark fibre of the olive palm tree

The relevance of use of bark fiber of the oil palm tree for the production of effective heat-insulating materials is justified. Compounds of heat-insulating plates on the basis of bark fiber are picked up. Results of the research of the main physico-mechanical characteristics of the developed heater are given

Composite material for thermal insulation based on moss raw material

The demand for thermal insulation materials composed of sustainable raw materials remains a challenge. The substances used in the manufacture of thermal insulation materials may also, under certain conditions, have a beneficial effect on the insulated surfaces, the environment, and the human or animal body, in particular by the ability to absorb moisture and biocidal properties. Ecological insulation materials of vegetable raw materials are increasingly widespread. Most of the time, these materials are made from flax, hemp or wood fibres, agglomerated with a binder. The objective of this work was to determine the possibility of using Sphagnum moss as a fibre in thermal insulation panels. To carry out this study, several compositions were developed for thermal insulation boards based on moss, rye straw and reed, using liquid glass as a binder. The specimens were tested for thermal conductivity, and strength to compression and bending. Best results were achieved on panels of moss and straw with thermal conductivity of 0.044–0.046 W/(m.K) at a density of 156–190 kg/m3, without shrinking during drying and a compression strength between 0.20 and 0.21 MPa. Electronic microscopy of rye straw and reed stems made it possible to examine the presence of outer and inner parts in the structure, which affect the thermal and strength characteristics. With the use of natural raw materials from plants and agricultural production residues, an effective and ecologically safe rigid board insulation was obtained, which has biocidal properties and has no analogues in the market for the construction of thermal insulation materials