Effect of Liquid Polyvinyl Acetate and Micronized Calcium Carbonate on Strength Parameters of Silty Sand Soil

2021 ◽  
Author(s):  
Ali M. Rajabi ◽  
Alireza Hosseini
Keyword(s):  
Calcium Carbonate ◽  
Polyvinyl Acetate ◽  
Silty Sand ◽  
Strength Parameters ◽  
Sand Soil

scholarly journals Physical and geotechnical properties of a silty sand soil treated with calcium carbonate fixing bacteria

2020 ◽  
Vol 195 ◽  
pp. 05002
Author(s):  
E. Garzón ◽  
L. Morales ◽  
J. Reca ◽  
E. Romero ◽  
P.J. Sánchez-Soto
Keyword(s):  
Calcium Carbonate ◽  
Friction Angle ◽  
Geotechnical Properties ◽  
Silty Sand ◽  
Natural Soil ◽  
Dry Density ◽  
Sand Soil ◽  
Precipitated Calcium Carbonate ◽  
Mineralogical Characterization ◽  
Treated Soil

The objective of the present study is to develop a biotechnological tool for a new application of silty sand soil as stabilized materials in linear works replacing chemical stabilizer (e.g. cement and lime) by natural cement, formed by precipitated calcium carbonate generated by microorganisms of the Sporosarcina family. For this purpose, it is conducted a chemical and mineralogical characterization and an examination of physical and geotechnical properties, being very important from the engineering standpoint. The results of different tests are presented here. The data show that the effects of bacteria are reducing the soil specific surface and increasing its plasticity. The reason for this result could be the addition of a plastic component to the natural soil, or the result of the more aggregated structure promoted during the treatment. The pore size distribution of the soil changes in an approximate range 3 - 30 µm, where the pore mode tends to disappear. The change in the pore density function is reflected in the mechanical behaviour of the treated soil, which presents typical features of a less dense soil with respect to the natural untreated one. The friction angle of the treated soil is slightly higher, and its compressibility is consistently lower than that of the natural soil. As the bacteria do not seem to produce any cementation effect on the soil skeleton, collapse upon wetting does not seem to be significantly affected by the treatment. On the contrary, comparison of collapse data shows that occurrence and amount of collapse are ruled by the as-compacted dry density. The tests performed seem to suggest that the microbiological technique may be effective to improve the mechanical characteristics of the compacted soil. For that, it is necessary to provide more energy in compacting the treated soil that it will be stabilized, so as to achieve a high initial dry density. From this viewpoint, it seems that higher compaction effort is even more effective than increasing the amount of bacteria introduced to stabilize the soil.

scholarly journals Preliminary research for identification of bacteria useful in microbially induced calcium carbonate precipitation

2018 ◽  
Vol 44 ◽  
pp. 00115
Author(s):  
Katarzyna Misiołek ◽  
Paweł Popielski ◽  
Katarzyna Affek
Keyword(s):  
Calcium Carbonate ◽  
Soil Stabilization ◽  
Carbonate Precipitation ◽  
Calcium Carbonate Precipitation ◽  
Construction Sites ◽  
Calcite Precipitation ◽  
Strength Parameters ◽  
Gram Staining ◽  
Identification Of Bacteria

MICP (Microbially Induced Calcite Precipitation) is a new biological method in soil stabilization. This cheap and eco-friendly technique improves strength parameters of the ground such as shear strength and decreases the permeability of gravelly and sandy soil. There are variety of microorganisms that can be used in calcite precipitation. The most popular method is precipitation of calcium carbonate by bacteria. The main purpose of the article is to present the results from Gram staining of bacteria isolated from construction sites, which is the first step of their identification. Gram’s method allows to find out which morphological groups of bacteria are adapted to conditions present in soil from construction sites and therefore are potentially able to produce calcite. The article describes the methodology of isolation, staining and determination of morphological types of bacteria.

scholarly journals Effect of additives on shrinkage property of unsaturated polyester and mechanical properties of artificial stone

2019 ◽  
Vol 16 (4) ◽  
pp. 85-96
Author(s):  
An Hai Thien Phung ◽  
Tai Tan Dang
Keyword(s):  
Mechanical Properties ◽  
Calcium Carbonate ◽  
Impact Strength ◽  
Polyvinyl Acetate ◽  
Unsaturated Polyester ◽  
Acrylonitrile Butadiene Styrene ◽  
Effect Of Additives ◽  
Artificial Stone ◽  
Shrinkage Property ◽  
Butadiene Styrene

Artificial stone is composite of unsaturated polyester and calcium carbonate that is mostly synthesized. This study aimed to investigate the effect of additives on shrinkage property of Unsaturated Polyester (UP) and mechanical properties of artificial stone such as flexural strength, impact strength, and hardness. In this paper, we tested effect of additives such as anhydride maleic (AM), acrylonitrile butadiene styrene (ABS), methyl methacrylate (MMA) and polyvinyl acetate (PVAc) with varying concentrations from 1 – 10 phr under condition process includes 2 phr BPO, 1100C cured temperature and 20 mins cured time

scholarly journals DESEMPENHO RODOVIÁRIO LABORATORIAL DO RESÍDUO DE MINERAÇÃO DE MANGANÊS DE LICÍNIO DE ALMEIDA - BA QUANDO MISTURADO COM A BRITA 1

2021 ◽  
Vol 9 (1) ◽  
pp. 99
Author(s):  
Glauber Miranda de Carvalho ◽  
Hélio Marcos Fernandes Viana ◽  
Rubem Xerxes Trindade Rodrigues ◽  
João Paulo Freire Rocha ◽  
Gilson Rodrigues Junior
Keyword(s):  
Statistical Models ◽  
Environmental Problem ◽  
Intermediate Energy ◽  
Silty Sand ◽  
Transport Infrastructure ◽  
Crushed Stone ◽  
Sand Soil ◽  
Road Pavement ◽  
Road Performance ◽  
Pavement Base

<p>O presente trabalho avaliou o comportamento do CBR, na energia intermediária de Proctor, quando são adicionadas porcentagens de 30%, 50% e 75% de brita 1, em massa, ao rejeito de manganês que foi coletado na região do município de Licínio de Almeida. O objetivo foi encontrar uma mistura que atendesse satisfatoriamente aos requisitos do Departamento Nacional de Infraestrutura de Transportes (DNIT) estabelecidos em 2006 para construção de base de pavimentos rodoviários. Os ensaios laboratoriais realizados na energia intermediária de Proctor verificaram a eficiência de cada uma das misturas a partir dos valores de CBR e de sua expansão observados. Com base nos modelos estatísticos desenvolvidos, este trabalho constatou que uma mistura de rejeito de manganês-brita 1, com apenas 39,5% de teor de brita 1, em massa, atende às referidas exigências. A conclusão do trabalho destaca que a adição de um baixo teor de brita 1, em massa, ao rejeito de manganês torna real a possibilidade de obter dois benefícios: combater um problema ambiental e viabilizar de forma altamente qualitativa a construção da base, que é uma das mais importantes camadas do pavimento rodoviário.</p><p align="left"><strong>Palavras-chave</strong>: Pavimento; Rejeitos; Manganês; Meio Ambiente</p><p align="left"> </p><p align="center">LABORATORY ROAD PERFORMANCE OF LICÍNIO DE ALMEIDA (BA) MANGANESE MINING WASTE, WHEN MIXED WITH BRITA 1<em></em></p><p align="left"><strong>Abstract</strong></p><p>This work aimed to use statistical modeling based on mixtures of materials, type of manganese tailings-crushed stone 1 to find a mixture that satisfactorily met the requirements of the DNIT (National Department of Transport Infrastructure) for the construction of a road pavement base. The crushed stone composed the studied mixtures in the contents of 30%, 50% and 75% by mass. Manganese tailings were classified as silty-sand soil (A-4 from TRB, SM from USCS and NA from MCT); Thus, the CBR behavior was evaluated that takes basis on the efficiency of each of the mixture for the intermediate energy of Proctor. Furthermore, based on developed statistical models, it was found that a mixture of manganese-crushed stone 1, with only 39.5% of gravel content, by mass, it was possible to meet the requirements of the DNIT (2006) for base construction of road pavements. Finally, with the addition of a low content of crushed stone 1, in mass, to the manganese tailings, the possibility of obtaining two benefits is real: to combat an environmental problem and to make possible the construction of the base, which is one of the most important road pavement layers.</p><p><strong>Keywords</strong>: Pavement; Tailings; Manganese; Environment </p>

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