Effects of PSD and surface morphology of micro-aggregates on admixture requirement and mechanical performance of micro-concrete

Felekoğlu, Burak

doi:10.1016/j.cemconcomp.2006.12.008

Cited by 32 publications

(15 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3 and 4 have improved the particle packing density in the cementitious system along with significant enhancement in rheological and mechanical properties. The micro-aggregates used in MC can be characterized based on the "fineness index" [3].…”

Section: Review Of Literature and Resultsmentioning

confidence: 99%

A Research on Sustainable Micro-Concrete

2019

ijrte

View full text Add to dashboard Cite

Construction sector which uses cement in its activities causing a release of CO2 into the atmosphere. Currently, all the sectors are viewing seriously in reducing environmental pollution and hazards. In this scenario, the research in industrial wastes such as fly ash, slag, used foundry sand, marble dust, etc., lead to use in construction industries as sustainable materials (SM), thereby contributing to reduction in environmental pollution. This paper reviewed the usage of these SM in the production of micro-concrete is very less when compared with new age conventional concrete, some of the effects of utilization of these SM in micro-concrete are presented. The quantum of research done in micro-concrete is very less, further studies to be done

show abstract

Section: Review Of Literature and Resultsmentioning

confidence: 99%

A Research on Sustainable Micro-Concrete

2019

ijrte

View full text Add to dashboard Cite

show abstract

“…O microconcreto pode ser definido como um concreto de alto desempenho proporcionado com microagregados cujo tamanho das partículas varia cerca de 0,5 mm a menos de 1 μm. A incorporação destes microagregados melhora a densidade de empacotamento de partículas do sistema cimentício, aprimorando, assim, as propriedades reológicas e mecânicas do material [15]. De acordo com FELEKOĞLU [14], se a viabilidade e a adequação técnica forem verificadas, a tendência é de se aumentar a quantidade de micro-agregados em um sistema de concreto podendo eliminar o uso de agregado graúdo.…”

Section: Introductionunclassified

Microconcreto de alto desempenho: propriedades e comportamento de pilar à flexão normal composta

et al. 2018

View full text Add to dashboard Cite

RESUMO O microconcreto de alto desempenho é um material que possui dimensão máxima de agregado reduzida e baixa relação água/aglomerante (a/aglm). Com o objetivo de verificar a aplicabilidade em elementos estruturais, estudou-se o comportamento do material e de um pilar executado com microconcreto de alto desempenho. Como referência, estudou-se outro concreto com mesmas proporções de materiais, apenas variando a dimensão máxima do agregado. Avaliaram-se as propriedades no estado fresco, mecânicas e de durabilidade dos materiais. Quanto aos pilares, os mesmos foram submetidos a uma situação de projeto de flexão normal composta. Estes pilares foram instrumentados por meio de extensômetros elétricos de resistência, relógios comparadores e Linear Variable Differential Transformer (LVDT), de forma a obter os deslocamentos horizontais, deformações na face comprimida do concreto e as deformações nas armaduras de aço; também foram acompanhadas as aberturas de fissuras por meio de marcação com pincel atômico. Quanto às propriedades no estado fresco, mecânicas e de durabilidade, verificou-se que o microconcreto teve melhor desempenho em relação ao concreto de referência, desempenho este atribuído às melhores propriedades da zona de interface pasta-agregado. O pilar de microconcreto rompeu por esmagamento do concreto da face comprimida, na região intermediária do pilar. Já o pilar de concreto convencional rompeu numa seção acima da intermediária, e a ruptura ficou caracterizada pelo desplacamento do concreto em duas faces adjacentes, em forma de quina, sugerindo uma ruptura por flexão composta oblíqua. Fez-se a comparação dos resultados experimentais obtidos com os resultados obtidos pelo software Esbelt 2.1, que considera os módulos de elasticidade segundo a NBR 6118 (ABNT, 2003). Ao final, pode-se constatar o melhor comportamento do pilar de microconcreto em relação ao pilar de concreto convencional, em termos de maior rigidez, sugerindo vantagens na aplicação do material em elementos estruturais destinados à préfabricação de elementos com seções transversais delgadas.

show abstract

“…The observation of FCP by microscopes is a direct way to analyze the microstructure of the FCP. Much research has been dedicated to studying the structural organization of cement particles in FCP as well as its time dependent evolution based on microscopy and granulometry techniques [12][13][14][15][16][17][18][19]. Optical and scanning electron microscopes have been frequently used to observe the mesostructure of a diluted FCP focusing on the granular shape and surface as well as the flocculation [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the mesostructural organization of cement particles in fresh cement paste

Zhang

Kong

Gao

et al. 2016

Construction and Building Materials

View full text Add to dashboard Cite

Comparative study on the mesostructures of fresh cement paste (FCP) in different dispersion mediums was carried out aiming at characterizing the structural organization of cement particles in FCP at a mesoscopic scale and establishing the correlation of mesostructure with rheological properties. For the first time, Morphologi G3 was adopted to in-situ characterize the mesostructure of FCP. Several dispersion mediums including air, 2 deionized water, ethanol and an aqueous solution of ethanol were chosen to study the dispersion of cement particles in the selected mediums. Superplasticizers, as dispersing aids for cement particles, were added to change the dispersion of cement particles. Results show that Morphologi G3 with the high sensitivity and the high resolution is a powerful tool for insitu characterization of the mesostructure of FCP by providing high-quality images associated with structural parameters. The structural parameters including particle size, circularity and fractal dimension of particle spatial distribution (Dpd) allow to quantitatively characterize the organization of cement particles in FCP at a mesoscopic scale, through which the relationship between the mesostructure and the rheological behavior of FCP was established. Higher fluidity signifies larger Dpd and circularity but a lower mean particle size. Moreover, the mean particle size and Dpd are more sensitive to indicate the fluidity change.

show abstract

Effects of PSD and surface morphology of micro-aggregates on admixture requirement and mechanical performance of micro-concrete

Cited by 32 publications

References 16 publications

A Research on Sustainable Micro-Concrete

A Research on Sustainable Micro-Concrete

Microconcreto de alto desempenho: propriedades e comportamento de pilar à flexão normal composta

Characterization of the mesostructural organization of cement particles in fresh cement paste

Contact Info

Product

Resources

About