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Permeability of Clay Concretes (2015)

F Solomon and S O Ekolu

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2015-11-03

Beschreibung: This paper presents an investigation on the effect of clay addition on water permeability and air permeability of concretes. Clay concrete mixes consisted of 0 to 40% clay content incorporated as cement replacement. Flow methods using triaxial cells and air permeameters were used for measuring the injected water and air flows under pressure. It was found that the higher the clay content in the mixture, the greater the permeability. At higher water-cement ratios (w/c), the paste matrix is less dense and easily allows water to ingress into concrete. But at high clay contents of 30 to 40% clay, the variation in permeability was significantly diminished among different concrete mixtures. It was confirmed that air permeability results were higher than the corresponding water permeability values when all permeability coefficients were converted to intrinsic permeability values.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Statistical Analysis of Concrete Cover in New Highway Bridges (2015)

O S Ekolu and F Solomon

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2015-11-03

Beschreibung: Quality control is one of the important aspects of any major construction works, which is to be undertaken to ensure work execution according to design requirements. The work presented in this paper involved measurement of cover thickness in three newly constructed highway bridges. Testing was conducted to ensure that specified requirements were attained prior to commissioning of the structures; otherwise, the quality control survey would identify problem areas for consideration of corrective measures. A total of 328 data sets were obtained during cover measurements. In this paper, the results obtained are discussed and evaluated. Data are characterised on the basis of statistical quantities.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Modification in Cay Concrete Properties During Fluid Flow Permeability Measurement (2015)

F Solomon and S O Ekolu

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2015-11-03

Beschreibung: In this paper, two methods consisting of triaxial water permeability and water penetration were used to evaluate the changes occurring in the pores of clay concretes during the tests. Triaxial permeability is generally used for concrete with higher permeability while concretes with very low permeability are suited for the penetration method. Clay concrete specimens of 0 to 40% clay content were used in the study. The concrete mixes had water-to-cement ratios (w/c) of 0.70, 0.75, 0.80, 0.85, and the cementitious content 380 and 450 kg/m 3 . Results show that concrete gains moisture during wetting at a much faster rate than loses it during subsequent drying. This could be explained by the contribution of suction pressure created upon drying. When water penetration pressure is applied, more water is driven into pore space that could be responsible for changing the network of the voids. Pore structure during drying may certainly be different in size and shape than its ...

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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3D Cell Culture Systems - Advantages and Applications (2014)

Maddaly Ravi, Paramesh V, Kaviya SR, Anuradha E, Solomon F D Paul

Wiley

In: Journal of Cellular Physiology

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Publikationsdatum: 2014-06-10

Beschreibung: Cells in cultures are important material of study for the variety of advantages that they offer. Both established continuous cell lines and primary cell cultures continue to be invaluable for basic research and for direct applications. Technological advancementsare important to address emerging complex challenges and the way cells are cultured in vitro is an area of intense activity. An important advancement in cell culture techniques is the introduction of three dimensional cultures systems. Probably, this area is one of the fastest growing experimental approaches in life sciences. Augmented with advancements in cell imaging and analytical systems, the applications of new scaffolds and matrices, cells are increasingly being grown as three dimensional models. Such cultures have proven to be closer to in vivo natural systems, thus proving to be useful material for many applications. Here, we review the three dimensional way of culturing cells, their advantages, the scaffolds and matrices currently available, and the applications of such cultures in major areas of life sciences. © 2014 Wiley Periodicals, Inc.

Digitale ISSN: 1097-4652

Thema: Biologie , Medizin

Publiziert von Wiley

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