Nicole Schwantes-Cezario

Unopar University

To study the influence of the curing procedure polymer-modified cement mortars (PMCM) were realized in two stages. In stage 1, PMCM with different percentages of PVA (5, 10, and 15%) were produced considering two times of PVA addition in the mix (3 and 6 minutes) evaluating the fresh and the hardened state. Stage 2, focuses on analyses of different...

Cementitious materials suffer from cracking, decreasing their durability. As a solution, crack self-healing materials using CaCO3 precipitating bacteria began to be studied worldwide. This research aimed to select the environmental bacterium with the most significant self-healing potential among samples isolated from a Brazilian cave in the Amazon...

Reinforced concrete is a constructive system widely used around the world. However, this constructive technique has constant failures and pathological manifestations. These problems may occur due to possible design flaws, mistakes in structural design, failures in execution process, as well as the lack of maintenance. Many researchers reported the...

Cracks in concrete’s structure may lead it to lose some properties, such as compressive strength. The use of self-healing concretes by the addition of bacteria is a way of sealing these cracks. In this work, 105 cells/ml of Bacillus subtilis showed favorable to this application. In the analysis of Dispersive Energy Spectroscopy coupled to Scanning...

The aim of this study was to propose a correlation for the hydraulic parameters of pervious concrete (PC). Thus, three aggregates from civil construction waste and one basalt aggregate (reference) were used to produce PC. The ratio c/a (cement: aggregate) 1:3.26 and a w/c ratio of 0.34 were used in all mixtures. Compressive and flexure tensile stre...

This study evaluated the possibility of using in natura Eucalyptus Wood Ash (EWA) from aviary furnaces as a mineral admixture in concrete. The ash was 100 mesh-sieved and added to the mix in 5, 10, 15 and 20% of the cement bulk. Physical analysis unveiled that EWA has a specific gravity higher than other organic originated residues, whereas its BET...

This study aims to evaluate the influence of B. subtilis AP91 spores addition on the mechanical properties of mortars. B. subtilis strain AP91, isolated from rice leaves of the needle variety, which has an early cycle of production, was used at the concentration of 105 spores/mL in mortars with cement-to-sand ratio of 1:3 (by weight) and water-to-c...

This study aims to evaluate the influence of B. subtilis AP91 spores addition on the mechanical properties of mortars. B. subtilis strain AP91, isolated from rice leaves of the needle variety, which has an early cycle of production, was used at the concentration of 105 spores/mL in mortars with cement-to-sand ratio of 1:3 (by weight) and water-to-c...

RESUMO A incorporação de nanossílica vem sendo estudada como uma alternativa para melhorar as características dos materiais cimentícios, pois tende a aumentar as reações pozolânicas e preencher os espaços intersticiais, diminuindo a porosidade e melhorando a resistência mecânica. Neste contexto, o presente estudo teve como objetivo avaliar o compor...

O concreto permeável (CoPe) é um dos materiais com maior importância no campo da pesquisa atual. Este material possui uma permeabilidade elevada, dada pelo seu alto índice de vazios que varia de 15-35%. A distribuição dos vazios e a permeabilidade estão diretamente ligadas a granulometria do agregado graúdo utilizado, sendo que podem ser utilizadas...

The development of the poultry business in Brazil has been causing considerable growth on the demand for the fuels used to heat up the internal environment of the poultry farms. Among these, the eucalyptus firewood can be pointed out, and once it is burned down, it produces residual ashes that frequently do not get adequate disposal. Thus, the use...

Este estudio tiene como objetivo analizar el desempeño de dos composiciones de hormigón con adición de esporas de B. sutilis con relación a su capacidad de relleno de fisuras durante el periodo de cura, evaluando la influencia de la adición en la resistencia a compresión. Para ello han sido estudiadas seis composiciones de hormigón, divididas en do...

A durabilidade dos compósitos cimentícios está intimamente ligada à sua porosidade, sendo que quanto mais poroso um material é, mais susceptível ele está à ação de intempéries. Com o intuito de diminuir a porosidade nos materiais cimentícios, as bactérias do gênero Bacillus estão sendo utilizadas como agentes biocimentantes de autocicatrização a pa...

In view of the growing concern about improving the characteristics and durability of cementitious materials, additions of bacteria, mainly of the genus Bacillus, are being studied as pore and crack filling through calcium carbonate precipitation (CaCO3). In this sense, the present study tested the strain B. subtilis AP91, isolated from rice leaves...

Este estudio tiene como objetivo verificar el potencial de uso del CBCA como sustitución parcial del cemento Portland. Por lo tanto, la campaña experimental fue dividida dos etapas; En la primera, se realizaron análisis mineralógicos y químicos con dos muestras de ceniza, crudas y calcinadas a una temperatura de 600°C durante 6h. En la segunda etap...

In recent years, the incorporation of micro and nanoparticles has been studied as an alternative to improve the characteristics of the cementitious materials. Researches on the reinforcement of cementitious composites per incorporation of micro and nanoparticles of silica have become more frequent and have demonstrated many benefits. However, the s...