Zeta potential of clay-size particles in urban rainfall–runoff during hydrologic transport

Kim, Jong-Yeop; Sansalone, John J.

doi:10.1016/j.jhydrol.2008.04.006

Cited by 20 publications

(6 citation statements)

References 37 publications

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“…Urban surfaces store solar energy, which is then transferred to water runoff during a rainfall event. Over the warm summer months, this stored energy is again partially transferred to runoff water at the time of rainfall events (Van Buren et al , 2000; Kim and Sansalone, 2008); such energy is capable of constituting a thermal source of stream pollution (Herb et al , 2008). Moreover, the water film resulting from rainfall on streets decreases the level of skid resistance (Sass, 1997), which in turn increases the risk of accidents after several days of dry weather (Eisenberg, 2004).…”

Section: Introductionmentioning

confidence: 99%

The hydrological behaviour of urban streets: long‐term observations and modelling of runoff losses and rainfall–runoff transformation

Ramier¹,

Berthier²,

Andrieu

2011

Hydrological Processes

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Abstract:Runoff on impervious surfaces (roads, roofs, etc.) raises a number of environmental and road safety-related problems. The primary objective of this research effort is to improve our knowledge of the hydrological behaviour of impervious urban surfaces in order to better assess runoff on these surfaces and its subsequent consequences. This article will focus on two street stretches studied over a 38-month period. Measurements of rainfall and runoff discharge on these stretches have made it possible to estimate runoff losses as well as to constitute a database for modelling purposes. On the basis of these data, two models have been used, one simple the other more detailed and physically based. For both models, runoff discharges at a 3-min time step are well reproduced, although runoff coefficients and runoff losses are still poorly estimated. Detailed analyses of experimental data and model output, however, indicate that runoff losses could be quite high on such 'impervious surfaces' (between 30 and 40% of total rainfall, depending on the street stretch) and that these losses are mainly because of evaporation and infiltration inside the road structure.

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Section: Introductionmentioning

confidence: 99%

The hydrological behaviour of urban streets: long‐term observations and modelling of runoff losses and rainfall–runoff transformation

Ramier¹,

Berthier²,

Andrieu

2011

Hydrological Processes

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“…However, despite this negative zeta potential, PCE may absorb on to SiO 2 particles via hydrogen bonds (46). Furthermore, the surface charge of clays in water at pH values of around 7 is also negative, ranging from -15 to -30 mV (24,47). As these were the conditions at which admixtures PCE and BNS suspended in water were adsorbed by the sands (Figures 4a and 4b), low adsorption values would be expected.…”

Section: Adsoption Isotherms For Sands In Cement Pore Solutionmentioning

confidence: 98%

PCE and BNS admixture adsorption in sands with different composition and particle size distribution

et al. 2017

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ABSTRACT:The choice of a superplasticiser (SP) for concrete is of great complexity, as it is well known that properties of the end product are related to admixture and its compatibility with concrete components. Very few studies have been conducted on the compatibility between SPs and the sand of mortars and concretes, however. Practical experience has shown that sand fineness and mineralogical composition affect water demand and admixture consumption. Clay-containing sand has been found also to adsorb SPs, reducing the amount available in solution for adsorption by the cement. This study analysed the isotherms for PCE and BNS superplasticiser adsorption on four sands with different fineness and compositions commonly used to prepare mortars and concretes. BNS-based SP did not adsorb on sands, while PCE-based admixtures exhibited variable adsorption depending on different factors. The adsorption curves obtained revealed that the higher the sand fineness, the finer the particle size distribution and the higher the clay material, the greater was PCE admixture adsorption/ consumption. RESUMEN: Adsorción de aditivos PCE y BNS en arenas con diferente composición y distribución de tamaño departículas. La elección de un superplastificante (SP) para el hormigón es un proceso complejo, ya que las propiedades del producto final se relacionan con la naturaleza del aditivo y su compatibilidad con los componentes del hormigón. Sin embargo hay pocos estudios sobre la compatibilidad entre los SPs y arenas utilizadas en morteros y hormigones. En la práctica se ha demostrado que la finura y la composición mineralógica de la arena afectan a la demanda de agua y al consumo de SPs. Las arcillas que pueden encontrarse en las arenas pueden también adsorber aditivos, reduciendo la cantidad disponible en solución para la adsorción por el cemento. Se han analizado las isotermas de adsorción para SPs de tipo PCE y BNS en cuatro arenas de diferente finura y composicion comúnmente utilizado para preparar morteros y hormigones. El aditivo BNS no se adsorbe en las arenas, mientras que los PCE mostraron adsorción variable. Las curvas de adsorción revelaron que cuanto mayor es la finura de arena, menor la distribución del tamaño de partícula y mayor el contenido de arcilla mayor era adsorción/intercalación de aditivos PCE en las arenas.

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“…Zeta potential is an important electrostatic parameter to evaluate the stability of particles suspended in an aqueous solution, and the particles with higher zeta potential are easily suspended (Kim and Sansalone 2008;Li and Xu 2008;Travis et al 2010). In 2-100 mM NaCl solutions, tailing and soil particles are all negatively charged (Table 4), suggesting the deposition of the tailing particles on soil matrix is under unfavorable conditions.…”

Section: Zeta Potentialmentioning

confidence: 99%

Mobilization and transport of metal-rich colloidal particles from mine tailings into soil under transient chemical and physical conditions

et al. 2016

Environ Sci Pollut Res

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Exposed mine tailing wastes with considerable heavy metals can release hazardous colloidal particles into soil under transient chemical and physical conditions. Two-layered packed columns with tailings above and soils below were established to investigate mobilization and transport of colloidal particles from metal-rich mine tailings into soil under transient infiltration ionic strength (IS: 100, 20, 2 mM) and flow rate (FR: 20.7, 41, and 62.3 mm h(-1)), with Cu and Pb as representatives of the heavy metals. Results show that the tailing particles within the colloidal size (below 2 μm) were released from the columns. A step-decrease in infiltration IS and FR enhanced, whereas a step-increase in the IS and FR restrained the release of tailing particles from the column. The effects of step-changing FR were unexpected due to the small size of the released tailing particles (220-342 nm, being not sensitive to hydrodynamic shear force), the diffusion-controlled particle release process and the relatively compact pore structure. The tailing particles present in the solution with tested IS were found negatively charged and more stable than soil particles, which provides favorable conditions for tailing particles to be transported over a long distance in the soil. The mobilization and transport of Cu and Pb from the tailings into soil were mediated by the tailing particles. Therefore, the inherent toxic tailing particles could be considerably introduced into soil under certain conditions (IS reduction or FR decrease), which may result in serious environmental pollution.

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Zeta potential of clay-size particles in urban rainfall–runoff during hydrologic transport

Cited by 20 publications

References 37 publications

The hydrological behaviour of urban streets: long‐term observations and modelling of runoff losses and rainfall–runoff transformation

The hydrological behaviour of urban streets: long‐term observations and modelling of runoff losses and rainfall–runoff transformation

PCE and BNS admixture adsorption in sands with different composition and particle size distribution

Mobilization and transport of metal-rich colloidal particles from mine tailings into soil under transient chemical and physical conditions

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