Use of cement dust in the manufacture of vitrified sewer pipes

This paper aims to investigate the influence of utilization micro cement kiln dust as a sustainable materials additive in order to reduce the voids and micro cracks in the cementitious mortar materials which cause a drastic reduction in the load carrying capacity of the element. Its therefore very important to decrease the pores and enhance the mechanical strength of the cementitious composite materials. In this article, the properties of self-compacting mortar containing micro cement dust additive was experimentally assessed. Micro cement dust powder was added to the self-compacting mortar in (1, 2, 3, 4 and 5 %) percentage by weight of cement to be used as cementitious sustainable materials. The experimental results indicated that the modification and enhancement of the workability of fresh mixture and the mechanical strengths of self-compacting mortar were increased as micro cement dust additives increases. Also; the water absorption and total porosity were decreased with increases of micro cement dust powder.

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Biological Mechanisms of H2S Formation in Sewer Pipes

Water Science & Technology ◽

10.2166/wst.1992.0471 ◽

1992 ◽

Vol 26 (3-4) ◽

pp. 907-914 ◽

Cited By ~ 14

Author(s):

A. Attal ◽

M. Brigodiot ◽

P. Camacho ◽

J. Manem

Keyword(s):

Suspended Solid ◽

Urban Wastewater ◽

Biological Mechanisms ◽

Sewer Pipes ◽

Sulfate Reducing ◽

Biological Phenomena ◽

Low Concentrations ◽

Production Of Hydrogen ◽

High Concentrations ◽

Reducing Bacteria

The purpose of this study is to gain a better understanding of the biological phenomena involved in the production of hydrogen sulfide in urban wastewater (UWW) systems. It is found that the UWW itself naturally possesses the biomass needed to consume the sulfates. These heterotrophic sulfate-reducing bacteria populations, though immediately active in strict anaerobic conditions, are present only in very low concentrations in the UWW. A concentration of them was studied within the pressure pipes, in the form of deposits, and this justifies the high concentrations of sulfides measured in certain wastewater networks. There are two reasons why the ferrous sulfate used as a treatment in any wastewater networks should not cause the production of additional sulfides. Firstly, the sulfate consumption kinetics are always too slow, relative to the residence time of the water in the pipe, for all of the sulfates to be consumed anyway. Secondly, the amount of assimilable carbon, soluble carbon, and carbon from suspended solid (SS) hydrolysis is insufficient.

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Qxygen transfer in gravity flow sewers

Water Science & Technology ◽

10.2166/wst.2000.0412 ◽

2000 ◽

Vol 42 (3-4) ◽

pp. 417-422 ◽

Cited By ~ 4

Author(s):

T.Y. Pai ◽

C.F. Ouyang ◽

Y.C. Liao ◽

H.G. Leu

Keyword(s):

Differential Equation ◽

Partial Differential Equation ◽

Dissolved Oxygen ◽

Flow Velocity ◽

Molecular Diffusion ◽

Eddy Diffusion ◽

Partial Differential ◽

Diffusion Term ◽

Sewer Pipes ◽

Gravity Sewer

Oxygen diffused to water in gravity sewer pipes was studied in a 21 m long, 0.15 m diameter model sewer. At first, the sodium sulfide was added into the clean water to deoxygenate, then the pump was started to recirculate the water and the deoxygenated water was reaerated. The dissolved oxygen microelectrode was installed to measure the dissolved oxygen concentrations varied with flow velocity, time and depth. The dissolved oxygen concentration profiles were constructed and observed. The partial differential equation diffusion model that considered Fick's law including the molecular diffusion term and eddy diffusion term were derived. The analytic solution of the partial differential equation was used to determine the diffusivities by the method of nonlinear regression. The diffusivity values for the oxygen transfer was found to be a function of molecular diffusion, eddy diffusion and flow velocity.

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An Experimental Study on the Transport of Sediment in Sewer Pipes with a Permanent Deposit

Water Science & Technology ◽

10.2166/wst.1992.0185 ◽

1992 ◽

Vol 25 (8) ◽

pp. 115-122 ◽

Cited By ~ 3

Author(s):

G. S. Perrusquía

Keyword(s):

Experimental Study ◽

Critical Shear Stress ◽

Side Wall ◽

Bedload Transport ◽

Flow Conditions ◽

Sewer Pipes ◽

Sediment Bed ◽

Concrete Pipe ◽

Geometric Factors ◽

Particle Parameters

An experimental study of the transport of sediment in a part-full pipe was carried out in a concrete pipe. The experiments were confined to bedload transport. The purpose of this study was to analyze the flow conditions that characterize the stream traction in pipe channels and their relationship to flow resistance and sediment transport rate. Three procedures used in this kind of experimental study were tested and found valid: 1) the vertical velocity distribution near the sediment bed can be described by the velocity-defect law, 2) the side wall elimination procedure can be used to compute the hydraulic radius of the sediment bed, and 3) the critical shear stress of the sediment particles can be obtained by using Shields' diagram. A relationship to estimate bedload transport, based on dimensional analysis, was proposed. This was expressed in terms of both flow and particle parameters as well as geometric factors. Further experimental work is recommended before this relationship can be fully incorporated in a simulation model for the analysis of storm sewers.

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Experimental study of the effect on soil erosion of using tiny gravel as bedding for defective sewer pipes

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1067/1/012008 ◽

2021 ◽

Vol 1067 (1) ◽

pp. 012008

Author(s):

H. H Khudhair ◽

K N Basim ◽

J H Al-Baidhani

Keyword(s):

Experimental Study ◽

Soil Erosion ◽

Sewer Pipes

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Experimental-numerical study on the structural failure of concrete sewer pipes

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2021.104075 ◽

2021 ◽

Vol 116 ◽

pp. 104075

Author(s):

I.C. Scheperboer ◽

R.A. Luimes ◽

A.S.J. Suiker ◽

E. Bosco ◽

F.H.L.R. Clemens

Keyword(s):

Numerical Study ◽

Structural Failure ◽

Sewer Pipes

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Influence of innovative three-element binder on permanent deformations in recycled mixtures with emulsion and foamed bitumen

Archives of Civil and Mechanical Engineering ◽

10.1007/s43452-021-00192-9 ◽

2021 ◽

Vol 21 (2) ◽

Author(s):

Grzegorz Mazurek ◽

Marek Iwański ◽

Przemysław Buczyński ◽

Renata Horodecka

Keyword(s):

Hydrated Lime ◽

Component Composition ◽

Load Level ◽

Point Of View ◽

Cement Dust ◽

Basic Part ◽

Fine Grained ◽

Time Deformation ◽

Hydraulic Binder ◽

Foamed Bitumen

AbstractThis article is detected to the assessment of durable deformations of recycled mixtures made of foamed bitumen (MCAS) and emulsion (MCE). In the basic part of research and analyses, attention was focused on determining the scale of three-component composition modifying rheological phenomena of recycled mixtures and other selected features considering various methods of bituminous binder proportioning. Cement, hydrated lime, and dusts from cement dust extracting system were included in the composition hydraulic binder. In this paper, the effect of graining of recycled mixture was also taken into account. One of the main scientific aims of the paper was to evaluate the degree of changes in durable deformations described in the power model depending on proportions of elements making three-element hydraulic binder. In effect, it was pointed out that the influence of hydraulic binder differently affected the durable deformation of recycled mixture depending on ways of bitumen binder implementation. There-element binder exerted the highest influence on mechanical properties of mixtures with fine-grained mixtures made according to the MCAS technology. The presence of 4 groups of mixtures with different properties was demonstrated using the classification neuron net. Based on that information, a set of the most recommended solutions from the point of view of time deformation resistance, low sensitiveness to the load level at moderate stiffness was selected. The best representative among them was the arrangement with 20% of hydrated lime, less than 40% of CBPD dusts and 40 ÷ 60% of cement.

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