scholarly journals Sound-Absorbing and Thermal-Insulating Properties of Cement Composite Based on Recycled Rubber from Waste Tires

2021 ◽  
Vol 11 (6) ◽  
pp. 2725
Author(s):  
Jakub Svoboda ◽  
Tomáš Dvorský ◽  
Vojtěch Václavík ◽  
Jakub Charvát ◽  
Kateřina Máčalová ◽  
...  
Keyword(s):  
Building Materials ◽  
Absorption Capacity ◽  
Acoustic Properties ◽  
Strength Characteristics ◽  
Cement Composites ◽  
Waste Tires ◽  
Natural Aggregate ◽  
Thermal Insulating ◽  
Recycled Rubber ◽  
Insulating Properties

This article describes an experimental study aimed at investigating the potential use of recycled rubber granulate from waste tires of fractions 0/1 and 1/3 mm in cement composites as a 100% replacement for natural aggregates. The use of waste in the development and production of new building materials represents an important aspect for the sustainability and protection of the environment. This article is focused on the sound-absorbing and thermal-insulating properties of experimental cement composites based on recycled rubber from waste tires. The article describes the grain characteristics of recycled rubber, sound absorption capacity, thermal conductivity and strength characteristics. The results of this research show that the total replacement of natural aggregate with recycled rubber in cement composites is possible. Replacing natural aggregate with recycled rubber has significantly improved the thermal and acoustic properties of the prepared cement composites, however, at the same time; there was also the expected decrease in the strength characteristics due to the elasticity of rubber.

Development of New Advanced Plasters with Waste Fibers Content

2018 ◽  
Vol 276 ◽  
pp. 248-253
Author(s):  
Jiří Zach ◽  
Jitka Peterková ◽  
Vítězslav Novák
Keyword(s):  
Mechanical Properties ◽  
Building Materials ◽  
Raw Materials ◽  
Cellulose Fibers ◽  
Positive Influence ◽  
Point Of View ◽  
Pet Bottles ◽  
Thermal Insulating ◽  
Insulating Properties ◽  
Recycled Waste

The paper deals with the possibilities of using secondary raw materials in the development of new advanced lightweight plasters. It was about fibers from recycled waste materials (waste paper, PET bottles, tyres) and recycled insulation (stone wool). The aim of adding fibers to these lightweight building materials was improvement of mechanical properties, improvement thermal insulation properties and reduction of crack sensitivity. It can be stated, based on the evaluation of the selected measurements, that both types of cellulose fibers and fibers from recycled tyres had positive influence on the mechanical properties, namely in the case of compressive strength. From the point of view of thermal insulating properties, it can be said that only 2 types of fibers have reduced the value of the thermal conductivity. They were mixtures with stone fibers and with recycled tyres fibers. Both of these mixtures also showed the lowest average values of bulk density. Based on the carried out research works can be it concluded that the use of recycled tyres fibers show as optimal.

Sustainable materials with high insulation capacity obtained from wastes from hemp industry processed by wet-laid

2021 ◽  
pp. 004051752110460
Author(s):  
O Gutierrez-Moscardo ◽  
M Canet ◽  
J Gomez-Caturla ◽  
D Lascano ◽  
E Fages ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Textile Industry ◽  
Areal Density ◽  
Absorption Capacity ◽  
Thermal Insulating ◽  
Viscose Fibers ◽  
Sustainable Materials ◽  
The One ◽  
Insulating Properties

This article reports on the revalorization of hemp waste from the textile industry, focusing on the development of new sustainable materials with high insulating properties. Wet-laid technology was used to manufacture nonwovens with different binding fibers, polylactic acid, and viscose fibers. The characterization of the acoustic insulating capacity was carried out using a Kundt tube, and the thermal insulating performance by measuring the heat transmission resistance ( R) and thermal conductivity ( λ). The results showed that the developed nonwovens have lower thermal conductivity values of about 0.027–0.034 W/(m K), were even lower than those of traditional thermal insulating materials, being the sample with 100 g/m2 of areal density and with a composition of 80% of hemp, 10% of polylactide and 10% of viscose the one with the lowest thermal conductivity (0.027 W/(mK). Their acoustic absorption capacity was around 0.76 at a frequency of 6 kHz, in samples containing high hemp waste (>80 wt%). However, the heterogeneous, discontinuous, and high void density structure that contributes to excellent insulating properties, lead to a decrease in their mechanical properties. This demonstrated that these materials are suitable for substituting traditional materials in insulating applications. Additionally, antifungal tests were carried out. However, hemp nonwovens proved to be inefficient against fungal proliferation.

scholarly journals THE PROPERTIES OF RECYCLED RUBBER FROM WASTE TIRES IN THE PRODUCTION OF CEMENT COMPOSITES

2020 ◽  
Vol 66 (1) ◽  
pp. 33-39
Author(s):  
Jakub Jakub ◽  
Vojtěch VÁCLAVÍK ◽  
Tomáš DVORSKÝ ◽  
Kateřina MÁČALOVÁ ◽  
Jakub CHARVÁT ◽  
...  
Keyword(s):  
Cement Composites ◽  
Waste Tires ◽  
Recycled Rubber

Possibility of Using the Technical Hemp as a Filling Component in External Thermal-Insulation Composite Systems

2012 ◽  
Vol 587 ◽  
pp. 47-51 ◽  
Author(s):  
Šárka Keprdová ◽  
Jiří Bydžovský
Keyword(s):  
Building Materials ◽  
Acoustic Properties ◽  
Filling Material ◽  
Insulation Material ◽  
Excellent Performance ◽  
Insulating Material ◽  
Environmentally Sustainable ◽  
Composite Systems ◽  
Natural Composite ◽  
Insulating Properties

Combining air or hydraulic binders with hemp shives, we can gain a set of new building materials. These products achieve excellent performance characteristics for durable, environmentally sustainable buildings. Being together, these products create natural composite building material that can be used to create insulating elements for walls, floors and roofs and also to create excellent thermal and acoustic properties of the buildings. Hemp insulation material is created by connection of technical hemp shives with a binder consisting of cement and calcium hydroxide. The production process may vary depending on whether the hemp is mineralized or not. It can be generally said that dry components should be mixed at first (binder and shives) and then water should be added. During the production, all components of insulating material must be perfectly mixed. The paper deals with the proposal and testing of new hemp insulation composites. Tests of the hemp insulation described in this paper are not typical representatives of the tests of insulation materials. Due to the doubts about the insulating properties of the proposed material, there was testing carried out in such the ways as if it was the filling material based on lightweight concretes.

The Utilization of a Combination of Recycled Rubber from Waste Tires and Waste Waters from a Concrete Plant in the Production of Cement Composites

2020 ◽  
Vol 838 ◽  
pp. 59-66
Author(s):  
Jakub Svoboda ◽  
Vojtěch Václavík ◽  
Tomáš Dvorský ◽  
Lukáš Klus ◽  
Jiří Botula
Keyword(s):  
Cement Composite ◽  
Partial Replacement ◽  
Cement Composites ◽  
Rubber Material ◽  
Waste Tires ◽  
Waste Sludge ◽  
Mortar Strength ◽  
Recycled Rubber ◽  
Mixing Water ◽  
Physical And Mechanical Characteristics

This article presents the results of a study dealing with the use of a combination of recycled rubber from waste tires as a 100% replacement of aggregate and waste sludge water from a concrete plant as a partial replacement of mixing water in the production of cement composites. The aggregate was replaced with recycled rubber material in two ratios. The first ratio was 50/50 and the other one was a 40/60 ratio of fraction 0/1 mm and fraction 1/3 mm. The mixing water was replaced with waste sludge water from a concrete plant in the amounts of 25% and 50%. The designed cement composite formulas were subjected to the test of their physical and mechanical characteristics in order to determine the properties when using a combination of recycled rubber and waste sludge water from a concrete plant. The tested properties include: consistency of the grain curve, mixing water properties, consistency of cement mortar, strength characteristics (tensile flexural strength and compressive strength). The study presents the results that are fundamentally different from the comparative samples and their use in the building industry but, at the same time, they also open up new possibilities of their use as building material.

Study of Heat Transfer Process in Structure of Thermal Insulating Materials Based on Natural Fibers

2014 ◽  
Vol 1000 ◽  
pp. 227-230 ◽  
Author(s):  
Jiri Zach ◽  
Jitka Peterková ◽  
Martin Sedlmajer ◽  
Azra Korjenic
Keyword(s):  
Building Materials ◽  
Natural Fibers ◽  
Natural Fibre ◽  
Heat Transfer Process ◽  
Heat Propagation ◽  
Natural Fibres ◽  
Low Carbon ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Insulating Properties

Natural fibre based thermal insulating materials belong to progressive building materials representing one of the possible ways in sustainable development and which are characterised with low carbon trace and low value of primary bound energy. In case of industrially produced insulating materials (for instance using thermal connection method) the insulating materials based on natural fibres showed comparable properties with industrially produced insulating materials on building markets. In the view of thermal insulating properties the natural insulating material show slightly different behaviour in comparison with synthetic insulating materials which is caused by fibrous structure of insulating materials and low thermal conductivity of natural fibres (contrary to glass or mineral fibres). The paper describes results of research oriented on study of heat propagation within materials based on natural fibres originated from agriculture and stockbreeding.

scholarly journals Electrical Impedance Used for Measurement of Moisture Distribution in Thermal Insulation Plasters

2019 ◽  
Author(s):  
Jitka Peterková ◽  
Martin Sedlmajer ◽  
Magdaléna Michalčíková ◽  
Jana Pařílková
Keyword(s):  
Thermal Insulation ◽  
Electrical Impedance ◽  
Building Materials ◽  
Negative Influence ◽  
Moisture Distribution ◽  
Masonry Construction ◽  
Thermal Insulating ◽  
Non Destructive ◽  
Insulating Properties

High moisture in building materials has a negative influence on their physical and thermal insulating properties. When building materials incorporated in a structure exceed the maximum permissible moisture, the material could change its properties to such an extent that its next usage is unfeasible. In case of thermal insulating materials, it causes serious degradation of thermal insulating properties. During the development of advanced thermal insulation plasters, long-term laboratory experiments were performed using masonry construction fragments, which focused on the study of their moisture proportions. For this purpose a new non-destructive method of electrical impedance was used, which enables measurements on defined levels in a matrix of test samples. Results obtained by measurements made on the surface of the samples were compared with the results obtained by a capacitive hygrometer. It was concluded that these methods provided similar results. The least moisture sensitive was the mixture, which was applied on masonry pillar E. In comparison with used thermal insulation plasters commonly used today this plaster shows considerably lower value of mass moisture under laboratory conditions, 1.38%. This pillar also exhibited the most uniform course of conductance measured along its height. 

Study of Hygrothermal Behavior of Insulation Materials Based on Natural Fibers

2015 ◽  
Vol 1124 ◽  
pp. 97-102
Author(s):  
Jiri Zach ◽  
Jitka Peterková
Keyword(s):  
Building Materials ◽  
Natural Fibers ◽  
Natural Fibre ◽  
Heat Propagation ◽  
Natural Fibres ◽  
Low Carbon ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Hygrothermal Behavior ◽  
Insulating Properties

Natural fibre based thermal insulating materials belong to progressive building materials representing one of the possible ways in sustainable development and which are characterised with low carbon trace and low value of primary bound energy. In case of industrially produced insulating materials (for instance using thermal connection method) the insulating materials based on natural fibres showed comparable properties with industrially produced insulating materials on building markets. In the view of thermal insulating properties the natural insulating material show slightly different behavior in comparison with synthetic insulating materials which is caused by fibrous structure of insulating materials and low thermal conductivity of natural fibres (contrary to glass or mineral fibres). The paper describes results of research oriented on study of heat propagation within materials based on natural fibres originated from agriculture and stockbreeding.

scholarly journals Thermal Insulating Properties of Straw-Filled Environmentally Friendly Building Materials

2017 ◽  
Vol 13 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Rositsa Petkova-Slipets ◽  
Penka Zlateva
Keyword(s):  
Thermal Conductivity ◽  
Composite Materials ◽  
Energy Efficient ◽  
Building Materials ◽  
Thermal Conductivity Coefficient ◽  
Environmentally Friendly ◽  
Thermal Insulating ◽  
Insulating Properties ◽  
Thermal Physical Properties

AbstractThe paper presents results of a research for determination of a few general thermal-physical properties of environmentally friendly building materials made by clay, sand and straw. The aim of this study is to establish their heat insulating and energy-efficient capacity. All specific measurements were carried out by using the newest generation thermal conductivity analyser Mathis TCi.The results showed that the studied composite materials are good thermal insulators with thermal conductivity less than 0.5 W/m.K, which depends on the straw amount. Even less than 0.5 wt.% straw reflects on the insulating properties by decreasing the thermal conductivity coefficient with nearly 50 %.

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