Experimental Study of the Recycled Plastic Aggregate Lightweight Composites Based on Different Kinds of Binder

2020 ◽  
Vol 868 ◽  
pp. 32-38
Author(s):  
Valéria Gregorová ◽  
Zuzana Štefunková ◽  
Miriam Ledererová
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Bulk Density ◽  
Thermal Conductivity Coefficient ◽  
Negative Impact ◽  
Cement Composites ◽  
Ethyl Vinyl ◽  
Cement Binder ◽  
Lightweight Composites ◽  
Recycled Waste

In this paper, the selected properties of lightweight composites based on the different kinds of binder and recycled waste plastics aggregate were studied. Plastic waste e.g. foamed polystyrene, polypropylene, polyurethane foam or ethyl vinyl acetate (EVA) as an aggregate in these composites was used. Cement CEM II B/S 32.5 R and an organic-based adhesive with the business name Conipur 360 were used as a binder. The cement composites consisted of constant water to cement ratio 0.50 and dose of cement 175 kg/m3. Mixtures of adhesive composites were prepared with constant dose of adhesive 100 kg/m3. The kind of recycled waste aggregate was only changed. The physical properties, such as bulk density, compressive strength and thermo-technical properties were verified. The application of organic-based adhesive resulted in a significant decreasing values of the bulk density (100 kg/m3 - 230 kg/m3) and the thermal conductivity coefficient (0.0511 W/m.K - 0.0686 W/m.K) of lightweight composites. The negative impact of this type of binder resulted to a decreasing value of the compressive strength (0.15 MPa - 0.32 MPa). Use of cement binder caused to an increasing of bulk density (290 kg/m3 - 375 kg/m3) and worsening of the thermal conductivity coefficient of these composites (0.0660 W/m.K - 0.0799 W/m.K). The compressive strength values of cement composites ranged from 0.24 MPa to 0.50 MPa.

Mechanical Properties and Thermal Conductivity of Lightweight Clay Bricks Fabricated with a Powdered Marble Dust Additive

2018 ◽  
Vol 777 ◽  
pp. 465-470
Author(s):  
Sutas Janbuala ◽  
Mana Eambua ◽  
Arpapan Satayavibul ◽  
Watcharakhon Nethan
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Bulk Density ◽  
Firing Temperature ◽  
Apparent Porosity ◽  
Clay Brick ◽  
Clay Bricks ◽  
Marble Dust

The objective of this study was to recycle powdered marble dust to improve mechanical properties and thermal conductivity of lightweight clay bricks. Varying amounts of powdered marble dust (10, 20, 30, and 40 vol.%) were added to a lightweight clay brick at the firing temperatures of 900, 1000, and 1100 °C. When higher quantities of powdered marble dust were added, the values of porosity and water absorption increased while those of thermal conductivity and bulk density decreased. The decrease in apparent porosity and water absorption were also affected by the increase in firing temperature. The most desirable properties of the clay bricks were obtained for the powdered marble dust content of 40 vol.% and firing temperature 900 °C: bulk density of 1.20 g/cm3, compressive strength 9.2 MPa, thermal conductivity 0.32 W/m.K, and water absorption 22.5%.

Cellulose Fibres as a Reinforcing Element in Building Materials

2017 ◽  
Author(s):  
Viola Hospodarova ◽  
Nadezda Stevulova ◽  
Vojtech Vaclavik ◽  
Tomas Dvorsky ◽  
Jaroslav Briancin
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Building Materials ◽  
Reference Sample ◽  
Physical And Mechanical Properties ◽  
Natural Fibre ◽  
Cement Composites ◽  
Cellulose Fibres ◽  
Cellulosic Fibres

Nowadays, construction sector is focusing in developing sustainable, green and eco-friendly building materials. Natural fibre is growingly being used in composite materials. This paper provides utilization of cellulose fibres as reinforcing agent into cement composites/plasters. Provided cellulosic fibres coming from various sources as bleached wood pulp and recycled waste paper fibres. Differences between cellulosic fibres are given by their physical characterization, chemical composition and SEM micrographs. Physical and mechanical properties of fibre-cement composites with fibre contents 0.2; 0.3and 0.5% by weight of filler and binder were investigated. Reference sample without fibres was also produced. The aim of this work is to investigate the effects of cellulose fibres on the final properties (density, water absorbability, coefficient of thermal conductivity and compressive strength) of the fibrecement plasters after 28 days of hardening. Testing of plasters with varying amount of cellulose fibres (0.2, 0.3 and 0.5 wt. %) has shown that the resulting physical and mechanical properties depend on the amount, the nature and structure of the used fibres. Linear dependences of compressive strength and thermal conductivity on density for plasters with cellulosic fibres adding were observed.

scholarly journals THE EFFECT OF EXPANDED GLASS AND POLYSTYRENE WASTE ON THE PROPERTIES OF LIGHTWEIGHT AGGREGATE CONCRETE

2016 ◽  
Vol 8 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Jurga Šeputytė-Jucikė ◽  
Marijonas Sinica
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Conductivity Coefficient ◽  
Lightweight Aggregate ◽  
Expanded Polystyrene ◽  
Partial Replacement ◽  
Lightweight Aggregate Concrete ◽  
Aggregate Concrete ◽  
Low Thermal Conductivity ◽  
Polystyrene Waste

The main objective of this study is to create a lightweight aggregate concrete (LWAC) with a low thermal conductivity coefficient using expanded glass (EG) aggregate, produced from waste glass or crushed expanded polystyrene waste, obtained by crushing waste packing tare of household appliances. Research related to the effects of the amount of Portland cement (PC) as well as EG aggregates and crushed expanded polystyrene waste on physical (density, thermal conductivity coefficient, water absorption and capillary coefficient) and mechanical (compressive strength) properties of LWAC samples are provided. Insulating LWAC based on a small amount of PC and lightweight EG aggregates and crushed expanded polystyrene waste, with especially low thermal conductivity coefficient values (from 0.070 to 0.098 W/ (m·K)) has been developed. A strong relationship between thermal conductivity coefficient and density of LWAC samples was obtained. The density of LWAC samples depending on the amount of PC ranged between 225 and 335 kg/m3. A partial replacement of EG aggregate by crushed expanded polystyrene waste, results in relative density decrease of LWAC samples. In LWAC samples the increased amount of PC results in increased compressive strength.

The Study on Physical and Thermal Properties of Geopolymer Pastes

2017 ◽  
Vol 751 ◽  
pp. 538-543 ◽  
Author(s):  
Pongsak Jittabut
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Water Absorption ◽  
Sodium Hydroxide ◽  
Bulk Density ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Weight Ratio ◽  
Thermal Capacity

This research was aimed to a present the physical and thermal properties of geopolymer pastes made of fly ash (FA) and bagasse ash (BA) with rice husk ash (RHA) containing at the doses of 0%, 2%, 4%, 6%, 8% and 10% by weight. The sodium hydroxide concentration of 15 molars, sodium silicate per sodium hydroxide by weight ratio of 2.0, the alkaline liquid per binder at the ratio of 0.60 and curing at ambient temperature were used at the to mix all mixtures to gether for 7 and 28 days. The properties analysis of the geopolymer pastes such as compressive strength, bulk density, water absorption, thermal conductivity, thermal diffusivity and thermal capacity were tested. The results were indicated that geopolymer pastes that containing rice husk ash 2% by weight for 28 days of curing gave the maximum compressive strength of 84.42 kg/cm2, low water absorption of 1.16 %, low bulk density of 2,065.71 kg/cm3, lower thermal conductivity of 1.1173 W/m.K, lower thermal diffusion of 6.643 µm2/s and lower thermal capacity of 1.6819 MJ/m3K, respectively. The utilization of waste from agriculture industry via geopolymer pastes for green building materials can be achieved. For this research, physical properties and thermal insulation of geopolymer pastes were siqnificantly improved.

The Study of Physical and Thermal Conductivity Properties of Cement Paste Containing Nanosilica

2015 ◽  
Vol 659 ◽  
pp. 164-168
Author(s):  
Pongsak Jittabut ◽  
Prinya Chindaprasirt ◽  
Supree Pinitsoontorn
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Bulk Density ◽  
Cement Paste ◽  
Unit Weight ◽  
Particle Sizes ◽  
Cement Pastes ◽  
Insulating Material ◽  
Surface Probe ◽  
Nanosilica Particle

This research was presented the physical and thermal conductivity properties of cement pastes containing nanosilica by mixing three nanosilica particle sizes of 12, 50 and 150 nm, using nanosilica of 1-5 wt%. The water-cementitious ratio (W/C) was 0.5 for all samples. Thermal property coefficients were tested using a direct measuring instrument with surface probe (ISOMET2114). The influence of nanosilica on the physical properties were compressive strength, bulk density, XRD and SEM respectively. The results indicated that the use of nanosilica as an admixture can reduce the thermal conductivity and lowered the bulk density of specimen. The cement paste with nanosilica particle size of 50 nm with 4 wt% nanosilica at the age of 28 days showed the optimized properties. The thermal conductivity was lowest at 0.913 W/m-K, the compressive strength was highest at 51.62 MPa and the bulk density was 1,806 kg/m3respectively. The compressive strength increases more than 50% higher than that of pure paste. The cement pastes with nanosilica particle sizes of 50 and 150 nm, have lower unit weight and thermal conductivity than typical control cement paste about 9% and 15% respectively. The nanosilica mixed cement paste is very interesting for energy saving when used as wall insulating material.

Influence of Air Entraining Agent on Performance of Inorganic Thermal Insulating Mortar

2011 ◽  
Vol 71-78 ◽  
pp. 490-493 ◽  
Author(s):  
Zhi Min He ◽  
Jun Zhe Liu ◽  
Tian Hong Wang
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Apparent Density ◽  
Thermal Conductivity Coefficient ◽  
Operating Performance ◽  
Drying Shrinkage ◽  
Test Results ◽  
Thermal Insulating ◽  
Excessive Consumption

This paper presents a laboratory study on the effect of air entraining agent on the performance of thermal insulating mortar with glazed hollow bead. The test results show that with the dosage of air entraining agent increases, the consistency of thermal insulating mortar increases, apparent density, thermal conductivity and drying shrinkage decline, However, the compressive strength greater losses owing to excessive consumption of air entraining agent; air entraining agent within a certain dosage can significantly improve the operating performance of thermal insulation mortar, increase its consistency and reduce its apparent density, thermal conductivity coefficient and drying shrinkage. Due to excessive addition of air entraining agent, the apparent density, thermal conductivity and compressive strength of thermal insulation mortar all increase. For a specific insulation mortar, there will exist the best mixing amount of air entraining agent.

scholarly journals Preparation and characterization of phase change energy storage gypsum

2020 ◽  
pp. 217-217
Author(s):  
Yichao Zhang ◽  
Ying Wang ◽  
Jinghai Zhou ◽  
Jian Huang ◽  
Xiaoxin Wu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Compressive Strength ◽  
Energy Storage ◽  
Phase Change ◽  
Phase Change Materials ◽  
Loss Rate ◽  
Thermal Conductivity Coefficient ◽  
Mass Loss Rate ◽  
Capric Acid

The thermophysical properties of binary phase change materials with different ratios of capric acid and palmitic acid were studied by step cooling curve method and differential scanning calorimetry in this paper. Furthermore, the best adsorption materials and coating materials were selected by testing their mass adsorption rate and mass loss rate. Finally, the specific heat capacity, thermal conductivity coefficient and compressive strength of phase change energy storage gypsum (PCESG) was determined respectively, and the energy-saving effect of the PCESG in the wall is evaluated. The results show that the binary phase change materials can form a eutectic system. When the mass ratio of capric acid to palmitic acid is 7:3, the low eutectic point of the binary system is formed, and the crystallization temperature of system is 26?C. The adsorption capacity of expanded perlite is much larger than that of ceramsite, and the mass loss rate of the material coated by styrene acrylic emulsion is lower than that of EVA. The specific heat capacity of PCESG is about twice that of ordinary gypsum. With the addition of phase change materials, the thermal conductivity coefficient of PCESG decreases gradually, and the compressive strength of PCESG decreases gradually at the same time. Compared with ordinary gypsum, PCESG has better energy-saving performance.

scholarly journals Evaluation of Physical Characteristics and Sorption of Cement Mortars with Recycled Ceramic Aggregate

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7852
Author(s):  
Agata Stolarska ◽  
Teresa Rucińska
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Thermal Conductivity Coefficient ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Fine Aggregate ◽  
Air Content ◽  
Nonstationary Method ◽  
Moisture Conditions

The subjects of this study were mortars with varying amounts of recycled ceramic aggregate (RCA). As part of the fine aggregate, the RCA volume share is 10%, 20%, 30%, 50% and 100%. First, fresh mixture parameters were evaluated, such as consistency and air content measurement by pressure method. Next, specimens were molded for compressive strength and flexural strength tests after 7, 28 and 56 days of curing. The thermo-humidity parameters of the composites, i.e., coefficient of capillary action and thermal conductivity coefficient were also investigated using nonstationary method. Sorption kinetics of the mortars at different moisture conditions at 20 °C were also evaluated. Sorption tests were carried out using two methods: TM and DVS. The sorption isotherms were plotted on the basis of equilibrium moisture content for the materials tested. The isotherms obtained by the two methods were evaluated. The results allowed us to draw conclusions on the physical and mechanical parameters of the composites with different amounts of RCA and to evaluate the ability to absorb moisture from the environment by these types of materials. A clear decrease in the compressive strength after 28 days of curing compared to the reference mortar was recorded after using 30% to 100% of RCA (approx. 26% to approx. 39%). Changes in flexural strength were significantly smaller, reaching no more than approx. 7.5%. It was shown that the amount of RCA translates into the ability to sorb moisture, which may affect the application of this type of composites. The amount of RCA translates also into the thermal conductivity coefficient, which decreased with increasing amount of RCA.

scholarly journals Effect of Silica Fume as a Component of Alternative Binder on the Selected Technically Important Characteristics of Bio-Aggregate-Based Composites

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2153 ◽  
Author(s):  
Nadezda Stevulova ◽  
Jozef Junak ◽  
Vojtech Vaclavik
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Bulk Density ◽  
Silica Fume ◽  
River Sand ◽  
Biomass Waste ◽  
The Matrix ◽  
Composite Samples ◽  
Hemp Hurd

This experimental study was focused on the application of an alternative binder based on MgO, and the variation of its components by the combination of two MgO products obtained by the calcinations of natural magnesite, siliceous materials (river sand and silica fume), and alkaline admixture in the mixture for a preparation of composite based on biomass waste such as hemp hurds as organic filler. This paper presents the results of the effect of an MgO binder composition on the compressive strength of the bio-aggregate-based composites. Other physical properties, such as the bulk density, thermal conductivity coefficient, and water absorption, were also investigated. The measured strength parameters of the bio-composite samples that were hardened for 28 days demonstrate that the binder consisting of optimal calcined MgO and silica fume as a total replacement for sand ensures a good binding of the matrix with hemp hurd compared to other varied compositions of alternative binder. No significant differences in bulk density and thermal conductivity values were found for these composites. However, the bio-composite specimen with an MgO–SiO2 matrix had the highest compressive strength and achieved the lowest value of water absorption. An increase in hardening time of up to 90 days led to a significant improvement of strength as well as reduction in permeability.

The Relationship of the Main Properties of Desulphurization Gypsum Based Inorganic Thermal Insulation Mortar

2013 ◽  
Vol 357-360 ◽  
pp. 1120-1123
Author(s):  
Yong Lai ◽  
Yan Liu ◽  
Zhi Gang Luo
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Bulk Density ◽  
Thermal Insulation ◽  
Relationship Of ◽  
The Relationship ◽  
Linear Correlations

This paper studies the relationship of the main properties of desulphurization gypsum based inorganic thermal insulation mortar. The results show that there are different linear correlations between fresh bulk density, hardened bulk density, compressive strength, volume water absorption, thermal conductivity and dry bulk density that is from 240 kg·m-3 to 500 kg·m-3. The linear correlations can provide some useful reference for the research and application of desulphurization gypsum based inorganic thermal insulation mortar.

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