scholarly journals Evaluation of hydromechanical behavior and macro-structure of an expansive soil in the city of Paulista-PE Brazil

2021 ◽  
Vol 337 ◽  
pp. 01002
Author(s):  
Felipe Araújo Silva Barbosa ◽  
Arthur Gomes Dantas de Araújo ◽  
Thalita Cristina Rodrigues Silva ◽  
Izabela Medeiros de Lima Bezerra ◽  
Antonio Celso Dantas Antonino ◽  
...  
Keyword(s):  
Expansive Soils ◽  
Expansive Soil ◽  
Chemical Characterization ◽  
Liquid Limit ◽  
Before And After ◽  
X Ray Computed ◽  
Wetting Process ◽  
Physical And Chemical ◽  
The City

The characterization of the structural arrangement of an unsaturated soil is important for the understanding of its behavior. For expansive soils, obtaining this information and combining it with an understanding of their intrinsic and extrinsic properties, makes it possible to predict their performance. The experimental procedure for this study was developed using the expansive soil of the Maria Farinha formation in the city of Paulista, in Pernambuco, Brazil. Physical and chemical characterization tests, edometric tests with wetting, and structural analysis through X-Ray computed tomography were performed for both undisturbed and compacted samples, before and after wetting and swelling. The compaction process was performed without any prior air drying and without loosening, beginning with the field moisture level. Based on its liquid limit and plasticity index, the soil can be classified as CH according to the USCS, moderately acidic, with a swelling potential ranging from high to very high, depending on the initial suction of the sample. The analysis of the soil macro-structure revealed a smaller number of voids in the compacted samples. In addition, it was found that the wetting process caused a reduction of the soil macro pores, in both cases.

scholarly journals UTILIZAÇÃO DA COMPACTAÇÃO PARA REDUÇÃO DO POTENCIAL DE COLAPSO/ EXPANSÃO DE UM SOLO SILTO ARGILOSO DE MASSAPÊ DA CIDADE DE ICÓ – CE

2016 ◽  
Vol 13 (1) ◽  
Author(s):  
Gleiber Da Silva Chagas ◽  
Alfran Sampaio Moura ◽  
Andressa De Araujo Carneiro
Keyword(s):  
Grain Size ◽  
Laboratory Tests ◽  
Expansive Soils ◽  
Liquid Limit ◽  
Shallow Foundations ◽  
Housing Development ◽  
Plastic Limit ◽  
Clayey Silt ◽  
The City

RESUMO: No presente trabalho apresenta-se um estudo do comportamento de um solo silte argiloso, de massapê da cidade de Icó-CE, que será utilizado como suporte das fundações das estruturas de um conjunto habitacional. O objetivo do trabalho é averiguar a eficiência da técnica da compactação na redução do potencial de colapso/expansão do solo estudado. Foi realizada uma caracterização do solo por meio de ensaios de laboratório (granulometria, limite de liquidez, limite de plasticidade, densidade real, compactação e CBR) e campo (SPT). Além disso, realizaram-se ensaios especiais do tipo edométrico simples e duplo. Foram coletadas ainda, em uma empresa local, um total de 20 furos de sondagens à percussão (SPT) e que foram realizadas no local do estudo. Pela análise dos resultados foi possível verificar que a compactação mostrou-se uma técnica eficiente para minorar ou mesmo eliminar o potencial de expansão/colapso do solo estudado. A realização deste trabalho contribui para a área do conhecimento pois comprova, a partir do estudo de um caso real, que a compactação de solos potencialmente colapsíveis ou expansivos, de fato, reduz seu potencial a níveis aceitáveis para uso como suporte de fundações superficiais de edifícios. ABSTRACT: FIn this paper we present a study of the behavior of a clayey silt soil, the city massapê Icó-CE, which will be used to support the foundations of the structures of a housing development. The objective is to ascertain the efficiency of the technique of compression in reducing the potential for collapse / expansion of the studied soil. A characterization of the ground by means of laboratory tests (grain size, liquid limit, plastic limit, real density, compaction and CBR) and field (SPT). In addition, there were special tests of simple and double edometer type. Were also collected, in one place, a total of 20 percussion boreholes (SPT) and were performed at the study site company. By analyzing the results we observed that compaction proved to be an efficient technique to reduce or even reduce the potential for expansion / collapse of the studied soil. This work contributes to the field of knowledge as proof, from the study of a real case that the compression of potentially collapsible or expansive soils, in fact, reduces its potential to acceptable levels for use as support shallow foundations of buildings.

scholarly journals Physical and Chemical Improvement of Clay Parameters Using Doped Marl with the Pozzolan in Fez Vicnity (Morocco)

2018 ◽  
Vol 12 (1) ◽  
pp. 283-293
Author(s):  
Laila Mesrar ◽  
Ahmed Banamar ◽  
Mariam Akdim ◽  
Raouf Jabrane
Keyword(s):  
Ceramic Industry ◽  
Chemical Characterization ◽  
Geochemical Analysis ◽  
Geotechnical Investigation ◽  
X Ray ◽  
Physical And Chemical Characterization ◽  
Before And After ◽  
Physical And Chemical ◽  
Identification And Characterization

Abstract Given the increasing exploitation of clay in Morocco for ceramic industry and for the purpose of the benefit reuse of this resource, a study is conducted in order to carry out the identification and characterization of Miocene clay after doping with pozzolan. The objective of this work is to improve the physicalchemical characteristics of Miocene clay of Fez region, by doping it pozzolan at different contents: 5, 10, 15 and 20%. Physical and chemical characterization of this clay was carried out before and after doping with pozzolan following various analytical technics, such as the X- ray fluorescence and geotechnical investigation. The result of geochemical analysis showed a higher rate of aluminum oxide (Al2O3), iron oxide (Fe2O3) and titanium oxide (TiO2). Further characterization of Atterberg limits have shown that the plasticity of doped materials increases. Similarly the mechanical behaviour of marls doped with pozzolan have significantly improved, providing a mechanical strength of obtained materials up to 670N when firing at 1000 °C, compared to the raw marls.

scholarly journals Physical and chemical characterization of Lopburi clay before and after calcination

2019 ◽  
Vol 1380 ◽  
pp. 012067
Author(s):  
P Chomyen ◽  
S Sinthupinyo ◽  
B Chamnankid ◽  
W Hanpongpun ◽  
A Chaipanich
Keyword(s):  
Chemical Characterization ◽  
Physical And Chemical Characterization ◽  
Before And After ◽  
Physical And Chemical

scholarly journals Physical and Chemical Characterization of an Oyster Hemagglutinin

1969 ◽  
Vol 244 (15) ◽  
pp. 4128-4135
Author(s):  
R T Acton ◽  
J C Bennett ◽  
E E Evans ◽  
R E Schrohenloher
Keyword(s):  
Chemical Characterization ◽  
Physical And Chemical Characterization ◽  
Physical And Chemical

Physical and Chemical Characterization of Asphalt (Bitumen) Paving Exposures

2007 ◽  
Vol 4 (sup1) ◽  
pp. 209-216 ◽  
Author(s):  
Robert F. Herrick ◽  
Michael D. McClean ◽  
John D. Meeker ◽  
Leonard Zwack ◽  
Kevin Hanley
Keyword(s):  
Chemical Characterization ◽  
Physical And Chemical Characterization ◽  
Physical And Chemical

scholarly journals Physical and chemical characterization of masa and tortillas from parental lines, crosses, and one hybrid

2017 ◽  
Vol 31 (1) ◽  
pp. 129-138 ◽  
Author(s):  
C. Valderrama-Bravo ◽  
A. Domínguez-Pacheco ◽  
C. Hernández-Aguilar ◽  
R. Zepeda-Bautista ◽  
A. del Real-López ◽  
...  
Keyword(s):  
Grain Quality ◽  
Chemical Characterization ◽  
Starch Granules ◽  
Grain Hardness ◽  
Crude Fiber Content ◽  
Viscoelastic Parameters ◽  
Maize Genotypes ◽  
Quality Product ◽  
Physical And Chemical

Abstract In maize plant breeding aimed at producing a hybrid, it is necessary to characterize the parents and hybrids by their agronomic aspects and grain quality so that the processing industry may offer consumers a quality product and also improve its efficiency. This study evaluated the viscoelastic parameters of masa and the chemical and texture properties of tortillas obtained from parent lines (M-54, M55, and CML-242), two single crosses (M54xM55 and M55xM54), and one hybrid (H-70). The morphology of the maize grains and tortillas was analyzed using scanning electron microscopy. The firmness of masa obtained from CML-242 and H-70 maize was higher than that from the other maize genotypes. M-54 tortillas showed the lowest crude fiber content. Otherwise, tortillas obtained from the M55xM54 hard grain had the lowest fat content and extensibility, while H-70 tortillas showed an intermediate breaking point and extensibility. M-54 and M54xM55 tortillas were softer due to their more swollen starch granules. In contrast, rigid tortillas were obtained from CML-242 and H-70. Grain hardness causes different morphology in starch and tortilla of maize genotypes. However, grain hardness did not influence the characteristics of texture in tortillas.

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