Properties of Artificial Lightweight Aggregates (ALAs) Made of Dredged Soil Mixed with Waste Catalyst Slag

2012 ◽  
Vol 174-177 ◽  
pp. 1079-1085 ◽  
Author(s):  
Si Nae Jo ◽  
Yoo Tack Kim ◽  
Seung Gu Kang ◽  
Chang Sam Kim
Keyword(s):  
Specific Gravity ◽  
Water Absorption ◽  
Lightweight Concrete ◽  
Sintering Temperature ◽  
Thermal Power ◽  
Lightweight Aggregates ◽  
Dredged Soil ◽  
Porous Carriers ◽  
Black Core ◽  
Sintering Method

The artificial lightweight aggregates (ALAs) were manufactured using dredged soil produced at thermal power plant and waste catalyst slag by direct sintering method at 1050~1250°C for 10min. The ALAs of 100% dredged soil showed the black core phenomenon even at the low sintering temperature as 1050°C and become lightened by bloating pores in black core area with sintering temperature. On the other hand, the aggregates with 100% waste catalyst slag did not showed black coring and bloating phenomenon and had the low forming ability and many cracks inside. Adding the dredged soil to the waste catalyst slag decrease the specific gravity by promoting the black coring and bloating inside. The water absorption(%) of ALAs decreased with sintering temperature. The ALAs fabricated in this study showed the specific gravity of 0.8~2.0 and water absorption of 2~16% so it could be applied to various fields such as the lightweight concrete or the field of the porous carriers for purification of a contaminated soil or water.

A Comparative Study on the Physical Properties of Artificial Aggregates Made from Acid Clay and Dredged Soil

2014 ◽  
Vol 804 ◽  
pp. 81-84
Author(s):  
Seung Gu Kang ◽  
Yong Sung Kim
Keyword(s):  
Specific Gravity ◽  
Water Absorption ◽  
Mass Production ◽  
Sound Absorption ◽  
Sintering Temperature ◽  
Thermal Power ◽  
Light Weight ◽  
Dredged Soil ◽  
Black Core ◽  
Functional Membranes

Artificial aggregates (AAs) were manufactured from the acid clay (waste bentonite) and dredged soil produced at a thermal power plant by sintering at 600~1200°C for 10min. And those specimens were compared with respect to their bloating ability. The aggregates of acid clay had well-developed black core and uniform macro pores. The specific gravity of the AAs of acid clay increased with sintering temperature at 600~1000°C due to densification, but dramatically decreased at 1100°C, and at this temperature, the AAs showed bloating. The specific gravity and water absorption of the aggregates of dredged soil decreased with sintering temperature at 600~1000°C, indicating that the dredged soil has the ability to enlarge the sintering temperature range, favorable for the mass production process. The specific gravity of the AAs fabricated in this research ranged 0.8~2.0 and the water absorption ranged 4~26%, which was sufficient for various applications, such as functional membranes, light weight construction, smart soil, sound absorption and insulation fields etc..

Influence of Addition of Waste Glass as a Fluxing Agent on the Bloating Phenomenon of Artificial Aggregates Fabricated from Coal Bottom Ash

2012 ◽  
Vol 724 ◽  
pp. 455-459 ◽  
Author(s):  
Seung Gu Kang ◽  
Si Nae Jo ◽  
Gi Gang Lee
Keyword(s):  
Power Plant ◽  
Water Absorption ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Bottom Ash ◽  
Waste Glass ◽  
Dredged Soil ◽  
Black Core ◽  
Fluxing Agent ◽  
Sintering Method

The artificial aggregates (AAs) were manufactured from the parent batch powders consisting of bottom ash produced at thermal power plant and dredged soil by direct sintering method at 1050~1200°C for 10min. The bloating phenomenon could be occurred in AAs due to a gas-capturing caused by large quantity of liquid formed at the specimen surface. Increasing the amount of the Na2O added enlarged the area of black core and size of the macro pores in the aggregates. The inside black core got out of the surface of the specimens sintered at 1200°C showing the rugged and cracked surface, but this morphology did not cause a water absorption to increase.

Effect of Sintering Conditions on the Bloating Property of Artificial Aggregates Made from Dredged Soil

2013 ◽  
Vol 302 ◽  
pp. 86-91
Author(s):  
Seung Gu Kang ◽  
Si Nae Jo
Keyword(s):  
Power Plant ◽  
Water Absorption ◽  
Sintering Temperature ◽  
Thermal Power ◽  
The Other ◽  
Green Body ◽  
Agricultural Engineering ◽  
Dredged Soil ◽  
Sintering Conditions ◽  
Sintering Method

The artificial aggregates were fabricated by two sintering methods to recycle the dredged soil produced at thermal power plant in Korea. The first one is the direct sintering method in which the green body is to put into the furnace of preheated at the desired temperature, and the other is the temperature-rising sintering method in which the green body is to put into the furnace of 800~900 oC, heated with a heating rate of 15 °C/min to the final sintering temperature. The aggregate manufactured by the direct sintering method showed the highest bloating behavior than that of the temperature-rising method. To provide the holding time in the input step was to decrease the bloating behavior in the temperature-rising sintering method. The water absorption for the all aggregates was decreased with sintering temperature, and the values of aggregates made by direct sintering was higher than that of the temperature-rising sintering method. The aggregate made of dredged soil by using various sintering methods had the specific gravity of 0.9~1.8 and water absorption of 3~14 %, and so could be applicable for many fields such as civil, environmental, and agricultural engineering fields.

Study on the Artificial Lightweight Aggregate by Using Reject Ash, Dredged Soil, and Ferrous Materials

2011 ◽  
Vol 695 ◽  
pp. 291-294
Author(s):  
Yoo Taek Kim ◽  
Yun Jae Choi ◽  
Chang Sub Jang ◽  
Hyun Jong Joo
Keyword(s):  
Specific Gravity ◽  
Physical Properties ◽  
Sintering Temperature ◽  
Lightweight Aggregate ◽  
Optical Observations ◽  
Cross Sectional ◽  
Dredged Soil ◽  
Burn Out ◽  
Black Core ◽  
Black Discoloration

The dependence of composition and sintering temperature on physical properties of ALA was investigated. Mechanism of black discoloration(sometimes called black core) usually found in the interior cores of artificial lightweight aggregate was also investigated by the optical observations. As a result, the primary cause of black discoloration in the interior of the lightweight aggregate body resulting from incomplete burn-out of carbonaceous impurities and iron-containing materials.In the cross-sectional morphology of ALA, bloating phenomena as well as formation of large pores were found in the samples containing ferrous materials. By increasing content of ferrous materials, both specific gravity and water absorption have been decreased.

Mechanical Properties of Artificial Lightweight Geopolymer Aggregate (ALGA) Concreteusing Volcano Mud with Various Sintering Temperature

2015 ◽  
Vol 754-755 ◽  
pp. 279-283 ◽  
Author(s):  
Rafiza Abdul Razak ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Khairul Nizar Ismail ◽  
D. Hardjito ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Water Absorption ◽  
Lightweight Concrete ◽  
Sintering Temperature ◽  
Alkaline Activator

The mechanical propertiesof artificial lightweight geopolymer aggregate (ALGA) using volcano mud in concrete have been investigated at various sintering temperature. The volcano mud was mixed with alkaline activator, formed into spherical pellets, then sintered in the furnace at temperature of 500°C, 600°C, 700°C, 800°C, 900°C, 950°C, and 1000 °C. The lightweight concrete with density below than 1800 kg/m3can be achieved at sintering temperature ALGA of 950 °C. The optimum compressive strength of 30.1 MPa was achieved at 28 days of testing. The lower water absorption of ALGA concrete was produced with 5-8 % in range.

scholarly journals Properties of the lightweight aggregate modified with the spent zeolite sorbents after sorption of diesel fuel

2014 ◽  
Vol 13 (2) ◽  
pp. 073-083
Author(s):  
Małgorzata Franus ◽  
Lidia Bandura
Keyword(s):  
Mechanical Properties ◽  
Specific Gravity ◽  
Water Absorption ◽  
Bulk Density ◽  
Diesel Fuel ◽  
Frost Resistance ◽  
Physical And Mechanical Properties ◽  
Lightweight Aggregate ◽  
Lightweight Aggregates ◽  
Volumetric Density

The paper presents the possibility of modification of the lightweight aggregate with mineral sorbents after sorption of petroleum substances. The aggregate is obtained with the plastic method by burning at 1170°C. Evaluation of the physical and mechanical properties was based on the parameters such as specific gravity, bulk density and volumetric density, porosity, water absorption, frost resistance and resistance to crushing. The investigated properties indicate that the resulting lightweight aggregate with the addition of used sorbents meets the basic requirements for the lightweight aggregates used in construction.

Evaluation of applicability of expanded shale to produce lightweight aggregate as a replacement for commercial LECA in constructions

2021 ◽  
pp. qjegh2020-176
Author(s):  
Mehdi Torabi-Kaveh ◽  
Mohammadreza Moshrefyfar ◽  
Jafar Zarezadeh ◽  
Seyed Mohammad Ali Moosavizadeh
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Lightweight Concrete ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Lightweight Aggregate ◽  
Mineralogical Composition ◽  
Lightweight Aggregates ◽  
Porous Microstructure ◽  
Expanded Shale

This study examined the potential of some shales obtained from different formations in Yazd province to produce Lightweight aggregates (LWAs) as natural materials and without the application of additives. Before heating the samples, the materials' usefulness for producing lightweight aggregates was examined by detecting the elemental and mineralogical composition of the shale samples. The presence of aluminosilicates and flux content confirmed and met the required conditions discussed by Riley's theory for the bloating process. Among the studied shale samples, Kharanagh shale samples of Kh1 and Kh2 were found as the most suitable materials to produce highly porous, light and mechanically durable aggregates after heating at the optimum temperature of 1200°C for a heating duration of 10min. The produced LWAs showed low density (for sample Kh1 equal to 0.7gr/cm3 which is close to the commercial LECA), low water absorption (quick water absorption indices of 5.35% and 5.48% for samples Kh1 and Kh2, respectively, which are less than one-third of LECA water absorption), porous microstructure (porous like LECA but with smaller pore size), and good mechanical properties (with aggregate impact and aggregate crushing values less than that of LECA and in the range of values suggested for construction aims). Finally, it was revealed that the produced LWAs have suitable microstructure, physical and mechanical properties, comparable with the commercial ones, which approve their potential for use as construction materials in lightweight concrete and road surface constructions.

Studies of Mechanical Properties and Absorption of Lightweight Concrete with Brazilian Expanded Clay

2013 ◽  
Vol 742 ◽  
pp. 231-236 ◽  
Author(s):  
Andressa Fernanda Angelin ◽  
Rosa Cristina Cecche Lintz ◽  
Luísa Andréia Gachet-Barbosa
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Specific Gravity ◽  
Pore Structure ◽  
Water Absorption ◽  
Rotary Kiln ◽  
Manufacturing Process ◽  
Lightweight Concrete ◽  
The Other ◽  
Viscous Mass

Brazilian Expanded Clay. The production process in a rotary kiln (or nodule) used in Brazil, characterized by the fact that certain materials expand when subjected to high temperatures (between 1000 °C and 1350 °C), such as some clays. In this temperature range, some of the material melts generating a viscous mass, while the other part chemically decomposes releasing gases which are incorporated by this mass, expanding by up to seven times its initial volume, the pore structure being maintained after its cooling. This manufacturing process promotes the formation of a glazed layer on the outside with low particle porosity, which significantly reduces the water absorption, has varying particle size and regular rounded shape, and its specific gravity comprised within the range from 0.64 to 1.51 kg/dm3 [4, .

scholarly journals The Influence of Sewage Sludge Content and Sintering Temperature on Selected Properties of Lightweight Expanded Clay Aggregate

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3363
Author(s):  
Jolanta Latosińska ◽  
Maria Żygadło ◽  
Przemysław Czapik
Keyword(s):  
Sewage Sludge ◽  
Water Absorption ◽  
Apparent Density ◽  
Environmental Sustainability ◽  
Sintering Temperature ◽  
Total Porosity ◽  
Raw Material ◽  
Closed Porosity ◽  
Specific Density ◽  
Sustainability Principles

Wastewater treatment processes produce sewage sludge (SS), which, in line with environmental sustainability principles, can be a valuable source of matter in the production of lightweight expanded clay aggregate (LECA). The literature on the influence of SS content and sintering temperature on the properties of LECA is scarce. This paper aims to statistically evaluate the effects of SS content and sintering temperature on LECA physical properties. Total porosity, pore volume, and apparent density were determined with the use of a density analyzer. A helium pycnometer was utilized to determine the specific density. Closed porosity was calculated. The test results demonstrated a statistically significant influence of the SS content on the specific density and water absorption of LECA. The sintering temperature had a significant effect on the specific density, apparent density, total porosity, closed porosity, total volume of pores, and water absorption. It was proved that a broad range of the SS content is admissible in the raw material mass for the production of LECA.

scholarly journals Effect of Sintering Temperature on Microstructure and Mechanical Properties of Hot-Pressed Fe/FeAl2O4 Composite

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 422
Author(s):  
Kuai Zhang ◽  
Yungang Li ◽  
Hongyan Yan ◽  
Chuang Wang ◽  
Hui Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Hot Press ◽  
Microstructure And Mechanical Properties ◽  
Powder Particles ◽  
Hot Press Sintering ◽  
Sintering Method

An Fe/FeAl2O4 composite was prepared with Fe-Fe2O3-Al2O3 powder by a hot press sintering method. The mass ratio was 6:1:2, sintering pressure was 30 MPa, and holding time was 120 min. The raw materials for the powder particles were respectively 1 µm (Fe), 0.5 µm (Fe2O3), and 1 µm (Al2O3) in diameter. The effect of sintering temperature on the microstructure and mechanical properties of Fe/FeAl2O4 composite was studied. The results showed that Fe/FeAl2O4 composite was formed by in situ reaction at 1300 °C–1500 °C. With the increased sintering temperature, the microstructure and mechanical properties of the Fe/FeAl2O4 composite showed a change law that initially became better and then became worse. The best microstructure and optimal mechanical properties were obtained at 1400 °C. At this temperature, the grain size of Fe and FeAl2O4 phases in Fe/FeAl2O4 composite was uniform, the relative density was 96.7%, and the Vickers hardness and bending strength were 1.88 GPa and 280.0 MPa, respectively. The wettability between Fe and FeAl2O4 was enhanced with increased sintering temperature. And then the densification process was accelerated. Finally, the microstructure and mechanical properties of the Fe/FeAl2O4 composite were improved.

Sign in / Sign up

Export Citation Format

Share Document