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.

scholarly journals Effects of rice husk ash and wollastonite incorporation on the physical and thermal properties of refractory ceramic composites

2020 ◽  
Vol 25 (3) ◽  
Author(s):  
Débora Silva ◽  
Eduardo Pachla ◽  
Ederli Marangon ◽  
Marco Tier ◽  
Ana Paula Garcia
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Water Absorption ◽  
Thermal Shock ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Raw Materials ◽  
Ceramic Composites ◽  
Apparent Porosity ◽  
Refractory Ceramic

ABSTRACT The main objective of this work was to evaluate the effects of rice husk ash and wollastonite microfibers incorporation, added per clay partial substituition, on physical and thermal properties of refractory ceramic composites. The raw materials characterization occurred with respect to their chemical composition (XRF), phase composition (XRD) and granulometry by laser. The composites were avaluated by physical properties - apparent porosity, bulk density, water absorption, linear retraction after sinterization and mass variation - and thermal properties - thermal conductivity and thermal shock. The rice husk ash used in the present work proved to have potential as a ceramic precursor in the development of refractories. The clay substitution per ash and the microfiber different percentages resulted in an increase in water absorption and apparent porosity and a reduction in the linear retraction. The increase in porosity suggests that the mullitization was insufficient. Regarding the thermal performance, the thermal conductivity was inversely proportional to the porosity and the microfiber percentage. In addition, the higher the thermal-shock temperature gradient the lower was the number of cycles resisted by the composites.

Effect of Rice Husk and Rice Husk Ash on Properties of Lightweight Clay Bricks

2015 ◽  
Vol 659 ◽  
pp. 74-79 ◽  
Author(s):  
Sutas Janbuala ◽  
Thanakorn Wasanapiarnpong
Keyword(s):  
Compressive Strength ◽  
Organic Matter ◽  
Chemical Composition ◽  
Water Absorption ◽  
Bulk Density ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Clay Brick ◽  
Clay Bricks ◽  
The Difference

The objective of this study is to investigate the effect of rice husk and rice husk ash which have the difference chemical composition and organic matter on porosity and properties of lightweight clay brick . Comparative adding between rice husk and rice husk ash were varied by 10, 20, 30, 40 % by weight. The results showed that more adding of rice husk and rice husk ash increase pore in microstructure and water absorption, while decrease bulk density. Porosity and water absorption are maximized when the rice husk are added at 40 %. The clay brick with 10, 20 and 30 % of rice husk or rice husk ash addition showed the required density and compressive strength followed the industrial standard of lightweight brick. The addition with 10 % of rice husk showed the best properties as 1.20 g/cm3 of bulk density and 4.6 MPa of compressive strength with 36.57 % of porosity. Whereas, the 10 % addition of rice husk ash showed 1.18 g/cm3 of bulk density and 5.97 MPa with 37.27 % of porosity.

Physical and Thermal Properties of Fired Clay Bricks Mixed with Rice Husk Ash and Fly Ash

2016 ◽  
Vol 718 ◽  
pp. 169-176 ◽  
Author(s):  
Korb Srinavin ◽  
Patipat Tunming
Keyword(s):  
Compressive Strength ◽  
Thermal Properties ◽  
Fly Ash ◽  
Thermal Resistance ◽  
Water Absorption ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Time Lag ◽  
Tropical Region ◽  
Clay Bricks

Thailand is located in a tropical region, with high intensity of sunlight, high temperature and humidity. Thus, preventing heat transfer into the building is required in order to save electrical energy for air-conditioning systems. This study aims to investigate the physical and thermal properties of construction bricks in order to increase their effectiveness of heat prevention. An attempt is made to increase discontinuous voids in fired clay bricks. Rice Husk Ash (RHA; 0-30 % by weight) and Fly Ash (FA; 0-30 % by weight) were added in brick mixture to increase those voids. Compressive strength and water absorption of bricks were tested. The testing results showed that compressive strength decreased and water absorption increased when RHA and FA were added. The thermal conductivity coefficient of bricks were also investigated. The results confirmed that the higher amount of RHA added, the higher thermal resistance of bricks. Similar results were found for FA. Increasing an amount of FA also increased thermal resistance of bricks. Thermal time-lag behavior was also tested. The results showed that RHA hollow bricks took the longest time in heating and took the shortest time in cooling. These properties are good for heat prevention. These bricks which were developed and tested in this research are conformed to the Thai Industrial Standard. Finally, it can be concluded that because of its thermal behavior, RHA hollow brick is a suitable energy-saving brick for hot and humid climates.

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%.

scholarly journals Hydrochloric Acid Pretreatment of Different Types of Rice Husk Ash Influence on the Properties of Cement Paste

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1524 ◽  
Author(s):  
Jing Liu ◽  
Chunyan Xie ◽  
Chao Fu ◽  
Xiuli Wei ◽  
Dake Wu
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Cement Paste ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Control Sample ◽  
Control Group ◽  
Rice Husks ◽  
Acid Pretreatment ◽  
Blank Control Group

When properly processed, rice husk ash (RHA) comprises a large amount of SiO2, which exhibits a high pozzolanic activity and acts as a good building filler. In this paper, the effects of rice husk ash content, acid pretreatment, and production regions on the compressive and flexural properties and water absorption of a cement paste were studied. The experimental results showed that the compressive strength of the rice husk ash was the highest with a 10% content level, which was about 16.22% higher than that of the control sample. The rice husk after acid pretreatment displayed a higher strength than that of the sample without the acid treatment, and the rice husk from the Inner Mongolia region indicated a higher strength than that from the Guangdong province. However, the flexural strength of each group was not significantly different from that of the blank control group. The trend observed for the water absorption was similar to that of the compressive strength. The variation in the RHA proportions had the greatest influence on the properties of the paste specimens, followed by the acid pretreatments of the rice husks. The production regions of the rice husks indicated the least influence.

scholarly journals EFFECT OF ALUMINUM DROSS AND RICE HUSK ASH ON THERMAL AND MOULDING PROPERTIES OF SILICA SAND

2017 ◽  
Vol 36 (3) ◽  
pp. 794-800
Author(s):  
EF Ochulor ◽  
HOH Amuda ◽  
SO Adeosun ◽  
SA Balogun
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Thermal Characteristics ◽  
Silica Sand ◽  
Cast Part ◽  
Solidification Kinetics ◽  
Moulding Sand

Moulding properties of foundry sand should be controlled so as to minimize casting defects. Its thermal characteristics are vital in defining the solidification kinetics of a cast part,  evolving microstructure and mechanical properties. Modification of the thermal properties of the moulding sand mix is important in achieving desired structure and mechanical properties in the cast component. This study investigates the incorporation of 2-12 wt. % aluminium dross (AlDr) and 1-6 wt. % rice husk ash (RHA) in silica sand on moulding and thermal properties of the resulting sand mix. Results show that RHA significantly reduced thermal conductivity of the moulding sand from 1.631-1.141 W/m. K (a 30% reduction).However, AlDr increased its thermal conductivity from 1.631-1.787 W/m.K for 1-6 wt. % AlDr, which later dropped progressively from 1.753-1.540 W/m.K for 8-12 wt. %. The moisture content increased abruptly from 4.0-4.2 % for 6-8 wt. % AlDr addition but decreased from 4.0-2.8% for0-6 wt. % RHA addition in the moulding sand mix. http://dx.doi.org/10.4314/njt.v36i3.19

Study of the Impact of Rice Straw Particle Size on the Mechanical and Thermal Properties of Straw Lime Concretes

2022 ◽  
Author(s):  
Youssef El Moussi ◽  
Laurent Clerc ◽  
Jean-Charles Benezet
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Water Absorption ◽  
Rice Straw ◽  
Absorption Capacity ◽  
Mechanical And Thermal Properties ◽  
Water Absorption Capacity ◽  
The Impact

The use of bio-based concretes performed with lignocellulosic aggregates constitute an interesting solution for reducing the energy consumption, greenhouse gas emissions and CO2 generated by the building sector. Indeed, bio-based materials could be used as an alternative of traditional materials such as expended polystyrene and mineral resources (e.g. glass and rock wools) for insulation. Furthermore, these bio-based concretes are known for their interesting insulation properties, indeed they allow to enhance thermal properties of buildings and enables moisture management which lead to design efficient building materials. For this purpose, bio-based concrete using rice straw as aggregate are studied in this present work. The impact of the characteristics of rice straw particle (particle size distribution, bulk density, and water absorption capacity, etc.) on both the mechanical and thermal properties of the bio-based concrete are investigated. Five formulations of rice straw concrete are examined, compared and then classified in terms of insulation properties and mechanical properties. The assessments are based on the measurement of density and thermal conductivity. The variation of compressive strength in function of the characteristics (mean particle length) of rice straw particle are assessed and discussed. The investigation covers also the porosity and density. Tests are also carried out on agricultural by-products with a view to highlight their chemical, physical and structural proprieties. The results show that the use of large particles with low water absorption capacity induce lighter concretes with the density between 339 and 505 kg/m3 and lead to a high compressive strength with a high mechanical deformability. Furthermore, it appears that an increase in the average length of rice straw particle lead to decrease of thermal conductivity of bio-based concretes. It varies from 0.062 to 0.085 W/(m.K).

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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