Electrical conductivity based characterization of plain and coarse glass powder modified cement pastes

Schwarz, Nathan; DuBois, Matthew; Neithalath, Narayanan

doi:10.1016/j.cemconcomp.2007.05.005

Cited by 121 publications

(41 citation statements)

References 28 publications

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“…In general, it can be concluded that the addition of GWG improves the workability of the concrete mix, primarily due to an increase in effective w/c and the negligible water absorption of the glass powder. This characteristic can be beneficially employed to reduce the w/c for a given workability (Schwarz et al 2007). This increase in workability may have a beneficial effect on concrete in the sense that concrete mixes with low water-to-cement ratios, for the same amount of cement materials replaced, can be produced which may have good workability, greater strength and improved durability than the control mix (i.e.…”

Section: Slump Flow Testmentioning

confidence: 99%

Fresh Properties of Self-Compacting Concrete Containing Ground Waste Glass Microparticles as Cementing Material

Sharifi

Afshoon

Firoozjaie

2015

ACT

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In this study, the fresh properties of self-compacting concrete (SCC) incorporating ground waste glass (GWG) as cementing material were experimentally investigated. GWG was used as a partial replacement for cement at replacement levels of 0, 5, 10, 15, 20, 25 and 30% by weight. Reducing the consumption of cement in construction is a major issue in terms of economic performance. Such reduction would also contribute to the environment by lessening the harmful impact of the manufacturing process. Concrete mixtures containing different levels of GWG were prepared with the water to cementitious materials ratio of 0.51. The examined properties included workability, wet density, air content and setting time. Workability of the fresh concrete was determined by using the slump flow, visual stability index, V-funnel, J-ring, L-box and GTM screen stability tests. The results indicate that there is a slight decrease in the wet density of self-compacting ground waste glass concrete (SCGWGC) of nearly 1.37% with the increase of GWG content. The conclusion is that using GWG significantly increases the workability of SCC mixtures. As the GWG increases, the slump flow also increases at a constant amount of water and super-plasticizer, but the concrete flow time decreases. The results showed that it is possible to successfully produce SCC with GWG as cement replacement.

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Section: Slump Flow Testmentioning

confidence: 99%

Fresh Properties of Self-Compacting Concrete Containing Ground Waste Glass Microparticles as Cementing Material

Sharifi

Afshoon

Firoozjaie

2015

ACT

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“…Thus the use of coarse glass powder as a cement replacement material cannot be justified. However, this could prove to be an ideal material as a filler in high performance and self-consolidating concretes, as detailed in [21]. Fig.…”

Section: Compressive Strength Of Cement Pastesmentioning

confidence: 99%

Properties of Cast-In-Place Concrete and Precast Concrete Blocks Incorporating Waste Glass Powder

Neithalath¹,

Schwarz²

2009

TOBCTJ

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This paper deals with studies on the use of waste glass powder as an effective ingredient in concrete. Studies on cement pastes including mechanical property tests and thermal analysis were used to understand the influence of the glass powder on the cement hydration process and to arrive at an optimal dosage range. Cast-in-place concrete and block mixtures were proportioned with varying dosages of glass powder, and tests for mechanical properties, alkali-silica reaction, and water absorption were carried out. The use of fly ash as a cement replacement material was also adopted in one of the concrete mixtures to compare the performance of glass powder and fly ash in concrete. Though the complete effect of cement dilution was not overcome by the chosen dosage of glass powder, the strength results were comparable to that of control concrete. Moisture intake results of glass powder modified concrete mixtures showed lower total water absorption as well as sorptivity than the control concrete when cured for a longer duration. The expansion due to alkali-silica reaction was also lower for the glass powder modified mixtures. For the concrete block mixtures, it was found that moist curing the blocks after initial steam curing was beneficial in strength improvement. Replacement of 10% cement with glass powder was found to result in equal or higher compressive strengths of the blocks. In regions where glass powder is locally available, its use as a cement replacement material presents an efficient waste management option, without compromising concrete performance.

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“…A condutividade efetiva das argamassas se mantem constante por uma longa faixa de variação da frequência, ou seja, no gráfico da condutividade versus a frequência, tem-se evidente um patamar que se estende por uma faixa de frequência bastante ampla, como de 1 Hz até 10 MHz (SCHWARZ et al 2007, NEITHALATH N., 2007.…”

Section: Figura 1 -Gráfico Típico Nyquistunclassified

Medidas de impedância elétrica de argamassas contaminadas com chumbo

Venâncio¹,

Rocha²,

Cheriaf³

2014

Encontro Nacional De Tecnologia Do Ambiente Construído

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RESUMOA espectroscopia de impedância eletroquímica (EIE) é utilizada amplamente no estudo dos materiais e neste caso, os materiais cimentícios também estão inseridos. A técnica permite a avaliação da estrutura, microestrutura e das propriedades físico-químicas durante e após a hidratação do cimento Portland. Neste estudo foram avaliadas a condutividade elétrica efetiva de argamassas contaminadas com nitrato de chumbo (Pb(NO 3 ) 2 ) e a difusividade dos íons de chumbo ao longo de 64 dias, durante o ensaio de lixiviação, conhecido como Tank Test. Para a realização do ensaio de impedância elétrica, uma corrente alternada (AC) foi imposta, na faixa de frequência de 200 kHz até 2 MHz. A contaminação com nitrato de chumbo foi realizada em quatro teores: 20, 40, 80 e 160 ppm do metal em relação à massa de cimento. Após o ensaio de lixiviação as argamassas com maiores concentração de chumbo, apresentaram os maiores valores de difusividade devido à maior liberação de hidróxido de cálcio. Aos 28 dias de cura das argamassas, todas as amostras contaminadas apresentaram valores de condutividades elétricas menores do que a argamassa sem contaminação. Em relação às condutividades efetivas, a contaminação com chumbo altera o comportamento elétrico das argamassas ao longo do período de hidratação, revelando uma tendência linear. Portanto, os materiais cimentícios produzidos com resíduos contaminados com chumbo, por exemplo, podem ser avaliados em relação a uma possível contaminação ambiental, por meio do Ensaio de Tanque, cuja duração é de 64 dias. No entanto, os ensaios elétricos podem vir a ser utilizados futuramente a fim de fornecer um rastreamento mais rápido desta contaminação e sem deixar de ser menos eficaz. Palavras-chave:Argamassas, Impedância Elétrica, Chumbo. ABSTRACT

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Electrical conductivity based characterization of plain and coarse glass powder modified cement pastes

Cited by 121 publications

References 28 publications

Fresh Properties of Self-Compacting Concrete Containing Ground Waste Glass Microparticles as Cementing Material

Fresh Properties of Self-Compacting Concrete Containing Ground Waste Glass Microparticles as Cementing Material

Properties of Cast-In-Place Concrete and Precast Concrete Blocks Incorporating Waste Glass Powder

Medidas de impedância elétrica de argamassas contaminadas com chumbo

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