A microstructure exploration and compressive strength determination of red mud bricks prepared using industrial wastes

Author(s):  
M.R. Sudhir ◽  
M. Beulah ◽  
P. Sasha Rai ◽  
G. Gayathri
2018 ◽  
Vol 923 ◽  
pp. 130-134 ◽  
Author(s):  
Ing Kong ◽  
Kay Min Khoo ◽  
Oliver Buddrick ◽  
Abdul Aziz Baharuddin ◽  
Pooria Khalili

The aim of this study was to synthesize the geopolymer composites formed by two industrial wastes, namely red mud (RM) and saw dust (SD). SD was chemically treated with alkali for the removal of lignin and subsequently bleached, before forming composite with acid-modified RM. The composites were then characterized by using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetic analysis (TGA) and universal testing machine to study the morphology, chemical, thermal and mechanical properties. The FTIR spectrum showed that Si and Al from the raw materials played the major role in forming aluminosilicate geopolymer composites. The SEM images revealed that SD and RM particles aggregated to form fully condensed geopolymer matrices with high compressive strength of 8.3-138 MPa, which were comparable to Portland cement (compressive strength of 9-20.7 MPa).


2013 ◽  
Vol 726-731 ◽  
pp. 2677-2680 ◽  
Author(s):  
Chang Sheng Lv ◽  
Jia Wei Wang ◽  
Ping Yuan Zhao ◽  
Yong Zhen Jia

The sintered brick was prepared with combining red mud and sale, as well as the sintered activation materials that were some industrial wastes. The effects of red mud content on property of sintered red mud-shale brick would be researched in this paper. The results showed when the ratio of red mud : sale : the sintered activation materials was 50:35:15, the sintered brick could meet the requirements of grade-A according to GB5101-2003, and the compressive strength reach MU25. The XRD showed that the main ingredient had been transformed into stabilized gehlenite, wollastonite and nepheline, as well as more glass phase and remained quartz.


Crystals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 572 ◽  
Author(s):  
Nevin Koshy ◽  
Kunga Dondrob ◽  
Liming Hu ◽  
Qingbo Wen ◽  
Jay N. Meegoda

Aluminosilicate gels form geopolymers and nanocrystalline zeolites which have comparable strength properties, making them a potential replacement for ordinary Portland cement. The study explores the use of two untreated industrial wastes, Class-F fly ash and red mud, for synthesizing geopolymeric material at ambient synthesis conditions. The high alkalinity present in the red mud was exploited for the dissolution of silica in the fly ash and red mud. The mechanical, mineralogical, microstructural, and pore characteristics were analyzed and the contributions of curing period, Si/Al, Na/Al, and liquid-to-solid (L/S) ratios on the compressive strength of the end products were also investigated. The alkalinity of the system due to the red mud was adequate for the dissolution of raw fly ash and the subsequent formation of aluminosilicate gels. The strength of the end product was directly proportional to the initial Si/Al ratio and the specimens with highest fly ash content exhibited highest compressive strength values after 28 days of curing. Furthermore, fly ash contributed to the formation and distribution of interstitial and capillary pores in the aluminosilicate matrix. The lowest L/S ratio of the initial mix resulted in the end product with the highest unconfined compressive strength.


2020 ◽  
Vol 256 ◽  
pp. 119427 ◽  
Author(s):  
Mahmood Khormani ◽  
Vahid Reza Kalat Jaari ◽  
Iman Aghayan ◽  
Seyed Hadi Ghaderi ◽  
Alireza Ahmadyfard

2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Diego Lucena de Sousa ◽  
Mateus Gonçalves de Oliveira ◽  
Paulo Sérgio Lima Souza

RESUMO: O objetivo deste estudo consiste no fato de se realizar uma comparação concisa entre o seixo lavado e o seixo misto utilizados com frequência na composição de traços de concreto em obras de pequeno e médio porte no município de Tucuruí/PA-Brasil. Desse modo, a partir dos ensaios de resistência à compressão, a determinação da absorção de água, índice de vazios e massa específica e a partir do uso de uma dosagem pré-estabelecida para o seixo lavado, pode-se realizar uma comparação entre os dois tipos de agregados. Assim, em posse dos resultados, notou-se que o seixo misto obteve certa superioridade em relação ao seixo lavado e que apesar disso, tal material não pode ser considerado ideal para a produção de concreto estrutural, visto que o mesmo não possibilita a utilização de um teor de argamassa ideal para viabilizar seu uso. A pesquisa corroborou o quanto é importante a realização de estudos na área em foco para o desenvolvimento local, assim, tal estudo evidencia a possibilidade do emprego do seixo misto em obras de pequeno e médio porte, visto que o mesmo apresentou resultados considerados satisfatórios para esta finalidade. ABSTRACT: The objective of this study is to perform a concise comparison between the washed pebble and the mixed pebble used frequently in the composition of concrete traces in small and medium size works in the municipality of Tucuruí / PA-Brazil. Like this, from the tests of compressive strength, determination of water absorption, voids index and specific mass and from the use of a pre-established dosage for the washed pebble, a comparison can be made between the two types of aggregates. Thereby, in the possession of the results, it was noticed that the mixed pebble obtained some superiority in relation to the washed pebble and that nevertheless, such material cannot be considered ideal to produce structural concrete, since it does not allow the use of an ideal mortar content to enable its use. The research corroborated how important it is to carry out studies in the area in focus for local development, so, this study evidences the possibility of the use of the mixed pebble in small and medium sized works, since it presented results considered satisfactory for this finality.


Author(s):  
Oldřich Sucharda ◽  
David Mikolášek ◽  
Jiří Brožovský

Abstract This paper deals with the determination of compressive strength of concrete. Cubes, cylinders and re-used test beams were tested. The concrete beams were first subjected to three-point or fourpoint bending tests and then used for determination of the compressive strength of concrete. Some concrete beams were reinforced, while others had no reinforcement. Accuracy of the experiments and calculations was verified in a non-linear analysis.


2018 ◽  
Vol 17 (8) ◽  
pp. 2001-2009
Author(s):  
Tatjana Juzsakova ◽  
Akos Redey ◽  
Le Phuoc Cuong ◽  
Zsofia Kovacs ◽  
Tamas Frater ◽  
...  

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