scholarly journals ANÁLISE COMPARATIVA ENTRE DOIS TIPOS DE AGREGADOS UTILIZADOS EM OBRAS DE PEQUENO E MÉDIO PORTE NO MUNICÍPIO DE TUCURUÍ - PA [Comparative analysis between two types of aggregates used in small and middle size works in the Municipality of Tucuruí - PA]

2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Diego Lucena de Sousa ◽  
Mateus Gonçalves de Oliveira ◽  
Paulo Sérgio Lima Souza
Keyword(s):  
Compressive Strength ◽  
Comparative Analysis ◽  
Water Absorption ◽  
Local Development ◽  
Medium Size ◽  
Specific Mass ◽  
Structural Concrete ◽  
De Se ◽  
Strength Determination

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.

scholarly journals Use of Recycled Tyre Rubber in Non-structural Concrete

2018 ◽  
Vol 203 ◽  
pp. 06001
Author(s):  
Muhammad Bilal Waris ◽  
Hussain Najwani ◽  
Khalifa Al-Jabri ◽  
Abdullah Al-Saidy
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Coarse Aggregate ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Structural Concrete ◽  
Cement Ratio ◽  
Mix Proportion ◽  
Water To Cement Ratio ◽  
Concrete Blocks

To manage tyre waste and conserve natural aggregate resource, this research investigates the use of waste tyre rubber as partial replacement of fine aggregates in non-structural concrete. The research used Taguchi method to study the influence of mix proportion, water-to-cement ratio and tyre rubber replacement percentage on concrete. Nine mixes were prepared with mix proportion of 1:2:4, 1:5:4 and 1:2.5:3; water-to-cement ratio of 0.25, 0.35 and 0.40 and rubber to fine aggregate replacement of 20%, 30% and 40%. Compressive strength and water absorption tests were carried out on 100 mm cubes. Compressive strength was directly proportional to the amount of coarse aggregate in the mix. Water-to-cement ratio increased the strength within the range used in the study. Strength was found to be more sensitive to the overall rubber content than the replacement ratio. Seven out of the nine mixes satisfied the minimum strength requirement for concrete blocks set by ASTM. Water absorption and density for all mixes satisfied the limits applicable for concrete blocks. The study indicates that mix proportions with fine to coarse aggregate ratio of less than 1.0 and w/c ratio around 0.40 can be used with tyre rubber replacements of up to 30 % to satisfy requirements for non-structural concrete.

scholarly journals Chemical, Physical, and Mechanical Properties of 95-Year-Old Concrete Built-In Arch Bridge

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 20
Author(s):  
Andrzej Ambroziak ◽  
Elżbieta Haustein ◽  
Maciej Niedostatkiewicz
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Modulus Of Elasticity ◽  
Ph Value ◽  
Water Soluble ◽  
Dry Density ◽  
Chloride Salt ◽  
Concrete Core ◽  
Arch Bridge

This research aimed to determine the durability and strength of an old concrete built-in arch bridge based on selected mechanical, physical, and chemical properties of the concrete. The bridge was erected in 1925 and is located in Jagodnik (northern Poland). Cylindrical specimens were taken from the side ribs connected to the top plate using a concrete core borehole diamond drill machine. The properties of the old concrete were compared with the present and previous standard requirements and guidelines. The laboratory testing program consisted of the following set of tests: measurements of the depth of carbonated zone and dry density, water absorption tests, determination of concrete compressive strength and frost resistance, determination of modulus of elasticity, measurement of the pH value, determination of water-soluble chloride salt and sulfate ion content, and X-ray diffraction analyses. Large variations in the cylindrical compressive strength (14.9 to 22.0 MPa), modulus of elasticity (17,900 to 26,483 MPa), density (2064 to 2231 kg/m3), and water absorption (3.88 to 6.58%) were observed. In addition to the experiments, a brief literature survey relating to old concrete properties was also conducted. This paper can provide scientists, engineers, and designers an experimental basis in the field of old concrete built-in bridge construction.

scholarly journals ANÁLISE DAS PROPRIEDADES DE BLOCOS DE CONCRETO PARA PAVIMENTO INTERTRAVADO PRODUZIDO COM CINZA DO BAGAÇO DA CANA-DE-AÇÚCAR

2018 ◽  
Vol 10 (4) ◽  
pp. 28-35
Author(s):  
Yann Carvalho Bonilha ◽  
Guilherme Souza Rodrigues ◽  
Isabela A. Mendes Martins ◽  
Beatriz de Mello Massimino ◽  
Daniele Araujo Altran ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Standardized Tests ◽  
Sugarcane Bagasse ◽  
Partial Substitution ◽  
Specific Mass ◽  
Natural Sand ◽  
Slump Test

The objective of this work was to study the partial substitution of the natural (sand) aggregate by ash from sugarcane bagasse (CBC), by mass, in the proportions of 10% and 20% for the preparation of pieces of concrete for interlocking pavement. Firstly, the pilot trait was developed, this one still withoutthe addition of CBC, which served as parameter for comparisons. The properties of the aggregates and the concrete were analyzed through standardized tests of granulometry, specific mass, slump test, compressive strength and water absorption. As for the values of compressive strength, the 10% substitution trait presented the best result of compressive strength, being 15% superior to the pilot trace. As for absorption, an increase in permeability was observed as the addition of CBC increased. Finally, it wasconcluded that the satisfactory trait in relation to the properties analyzed was the 10% substitution trait.

scholarly journals On the possibility of using lime dust for the production of building materials of forced carbonate hardening

2020 ◽  
Vol 315 ◽  
pp. 07008
Author(s):  
Aleksandr Bakhtin ◽  
Nikolai Lyubomirskiy ◽  
Sergey Fedorkin ◽  
Tamara Bakhtina
Keyword(s):  
Compressive Strength ◽  
Water Absorption ◽  
Water Content ◽  
Building Materials ◽  
Raw Materials ◽  
Average Density ◽  
Technological Parameters ◽  
Shaft Furnaces ◽  
Recycled Material

The paper presents research on the development of building materials with low level of CO2 emissions based on technogenic recycled materials. The paper addresses the determination of optimal formulation and technological parameters of obtaining materials based on lime dust generated by mechanical deposition in cyclones and bag filters of shaft furnaces, as well as finely dispersed marble limestone with a fraction of up to 5 mm. Studies have shown that it is possible to obtain carbonized material with compressive strength of more than 40 MPa from this recycled material by forced carbonization used during three hours. Moreover, to obtain such numbers, the optimal content of lime dust in raw materials should be in the range of 35-40% wt. when the water content of the mixture is 6-7% wt. The carbonized material obtained with the indicated technological parameters will have an average density of 1.95-2.0 g/cm3 and water absorption by weight of not more than 12%.

scholarly journals The Effect of Steel and Polypropylene Fibers on the Properties of Horizontally Formed Concrete

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5827
Author(s):  
Adrian Chajec ◽  
Łukasz Sadowski
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Comparative Analysis ◽  
Fresh Concrete ◽  
Mechanical Analysis ◽  
Hardened Concrete ◽  
Polypropylene Fibers ◽  
Structural Concrete ◽  
Air Voids ◽  
The Impact

The article presents a comparative analysis of the impact of the addition of steel and polypropylene fibers on the properties of the concrete mixes and hardened concrete used in the concrete floor industry. The behavior of concrete intended for floors is different from conventional structural concrete because it is formed horizontally; until now, the effect of steel and polypropylene fibers on the properties of concrete formed horizontally has not yet been fully understood. Therefore, the aim of this article is to examine this issue and compare the behavior of concrete modified with steel and polypropylene fibers in concrete that is formed horizontally. The following properties of fresh concrete mixes were analyzed: consistency, the content of air-voids, and bulk density. Consequently, the following properties of hardened concrete were analyzed: compressive strength, bending tensile strength, and brittleness. It was confirmed that steel and polypropylene fibers have a different type of effect on the properties of fresh concrete mixes and hardened concrete. Finally, a combined economic and mechanical analysis was performed.

Compressive strength determination of concrete specimens using X-ray computed tomography and finite element method

2020 ◽  
Vol 256 ◽  
pp. 119427 ◽  
Author(s):  
Mahmood Khormani ◽  
Vahid Reza Kalat Jaari ◽  
Iman Aghayan ◽  
Seyed Hadi Ghaderi ◽  
Alireza Ahmadyfard
Keyword(s):  
Computed Tomography ◽  
Finite Element Method ◽  
Finite Element ◽  
Compressive Strength ◽  
X Ray ◽  
Strength Determination ◽  
X Ray Computed ◽  
Element Method

scholarly journals PENENTUAN MORFOLOGI PERMUKAAN, SIFAT FISIS DAN MEKANIK BERDASARKAN PRESENTASE KOMPOSISI BAHAN CAMPURAN BATAKO

2018 ◽  
Vol 3 (1) ◽  
pp. 59-68
Author(s):  
Selfiana Missa ◽  
Minsyahril Bukit ◽  
Andreas Christian Louk
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Data Analysis ◽  
Surface Morphology ◽  
Water Absorption ◽  
Compression Strength ◽  
Test Specimen ◽  
Physical And Mechanical Properties ◽  
Drying Process

ABSTRAK Telah dilakukan penelitian tentang kajian Morfologi Permukaan, Sifat Fisik dan Mekanik Batako dengan presentase komposisi bahan campuran batako. Penelitian ini dilakukan dengan menggunakan material tanah putih dan pasir. Selanjutnya bahan material dicampur dengan semen dengan variasi material 1:5, 1:6, 1:7, 1:8 dan 1:9. Kemudian dicetak dengan cara, pemadatan dan pengeringan. Setelah proses pengeringan dilakukan pengujian karakteristik sifat fisik dan mekanik benda uji berupa: uji kuat tekan (compression strength), densitas (density), porositas dan karakterisasi SEM. Berdasarkan analisis data, batako yang memiliki nilai densitas untuk variasi campuran tanah putih 665 mesh 2,05 gr/cm3, 2,04 gr/cm3dan 1,99 gr/cm3. Pada variasi campuran tanah putih 114 mesh 2,16 gr/cm3, 2,14 gr/cm3dan 2,05 gr/cm3. Untuk variasi campuran pasir 665 mesh 2,04 gr/cm3, 1,89 gr/cm3dan 2,11 gr/cm3. Untuk variasi campuran pasir 114 mesh 2,05 gr/cm3, 2,11 gr/cm3dan 2,02 gr/cm3.kuat tekan batako pada variasi campuran tanah putih 114 meshsebesar 20 kg/cm² memenuhi standar kuat tekan minimum mutu  IV. Sedangkan untuk porositas pada variasi campuran 1:6 dan 1:8 memenuhi standar penyerapan air pada mutu I dan mutu II. Kata kunci: Tanah putih, pasir, densitas, penyerapan air, kuat tekan dan SEM. ABSTRACT A research of determination of surface morphology, physical properties and mechanical properties of brick based on the composition of the mixture has been done. This research was done by using material of white soil and sand. Then Materials are mixted with cement with materials variation 1:5, 1:6, 1:7, 1:8 dan 1:9. Than each one was molded by means of compaction and drying.  After drying process the physical and mechanical properties of the test specimen is done in the form of compression test, density, porosity, and SEM characterization. Based on data analysis, brick with mixed variation of white soil of 665 mesh has the density value of 2,05 gr/cm3, 2,04 gr/cm3 dan 1,99 gr/cm3. For brick with mixed variation of white soilof 114 mesh has the density value are 2,16 gr/cm3, 2,14 gr/cm3dan 2,05 gr/cm3. For brick with mixed variation of sand of 665 mesh has the density value are 2,04 gr/cm3, 1,89 gr/cm3 dan 2,11 gr/cm3. For brick with mixed variation of sand of 114 mesh has the density value are 2,05 gr/cm3, 2,11 gr/cm3dan 2,02 gr/cm3. Compressive strength of brick with mixed variation of white soil of 114 mesh is 20 kg/cm² meet the minimum compressive strength standard of quality IV. While for the porosity of brick with mixed variation of 1:6 and 1:8 meet the standards of water absorption standard of quality I and quality II. Key Words : White  Soil,  sand,  density,  water  absorption,  Compressive  strength,  and  SEM

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