Geological and physiochemical characterisation of construction sands in Qatar

Al-Ansary, Marwa; Pöppelreiter, Michael; Al-Jabry, Asia; Iyengar, Srinath R.

doi:10.1016/j.ijsbe.2012.07.001

Cited by 25 publications

(15 citation statements)

References 4 publications

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“…Both systems, though fluctuating, were clearly established over Holocene time scales [46,47], and so was the Shamal [48].…”

Section: Discussionmentioning

confidence: 99%

“…As different varieties of human impact can have tremendous influence on dune mobility-mostly through interaction with vegetation [34,46]-we hypothesize that the intense sand mining activities in the NW part of the core study area since 2007 by the Qatar Primary Materials Company (QPMC) [47] have changed the local wind field and significantly increased sand flux, in particular in the lower range of the dune-forming grain-size spectrum. Both massive truck traffic upwind of the core study area ( Figure 5) [48] and the sand mining process itself are assumed to have strongly stimulated sand flux, which is correlated to downwind barchan dune velocity [6,7].…”

Section: Barchan Dynamics and Their Controlmentioning

confidence: 99%

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Migration of Barchan Dunes in Qatar–Controls of the Shamal, Teleconnections, Sea-Level Changes and Human Impact

2018

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Abstract:Barchan dune fields are a dominant landscape feature in SE Qatar and a key element of the peninsula's geodiversity. The migration of barchan dunes is mainly controlled by dune size, wind patterns, vegetation cover and human impact. We investigate the variability of dune migration in Qatar over a time period of 50 years using high-resolution satellite and aerial imagery. We then explore its relation to the regional Shamal wind system, teleconnection patterns, and limitations in sand supply associated with the transgression of the Arabian Gulf. Strong size-dependent differences in migration rates of individual dunes as well as significant decadal variability on a dune-field scale are detected, which are found to correlate with the intensity of the North Atlantic Oscillation (NAO) and the Indian Summer Monsoon (ISM), in particular during years of relatively strong (weak) summer Shamals. High uncertainties associated with the extrapolation of migration rates back into the Holocene, however, do not permit further examination of the timing of the loss of sand supply and the onset of the mid-Holocene relative sea-level (RSL) highstand. For the youngest phase considered in this study (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015), human impact has likely accelerated dune migration under a weakening Shamal regime through sand mining and excessive vehicle traffic upwind of the core study area.

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“…Both systems, though fluctuating, were clearly established over Holocene time scales [46,47], and so was the Shamal [48].…”

Section: Discussionmentioning

confidence: 99%

Section: Barchan Dynamics and Their Controlmentioning

confidence: 99%

Migration of Barchan Dunes in Qatar–Controls of the Shamal, Teleconnections, Sea-Level Changes and Human Impact

2018

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“…Recent studies have been directed towards examining the engineering properties of aeolian sands and investigating the ability of using them in construction [6][7][8][9].In the last years, substantial research has been directed to examine different types of additives and their potentiality as stabilizing agents for aeolian sands. Different methods of stabilization have been reported in the literature including the use of cement [10][11][12][13], cement kiln dust [14][15][16][17], bentonite and lime [18][19], bitumen…”

Section: Introductionmentioning

confidence: 99%

Uses of Sand Dunes as Building Materials

J. Al-Shakeri,

K. Jasim,

H. Abdullah

et al. 2021

Iraqi Journal of Science

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During the past forty years, and due to the global climate changes, Iraq had and still suffering from the spreading and expansion of large dune fields in which many new generations have been accumulated, and older ones have expanded leading to the desertification of huge agricultural and urban areas and causing vast environmental problems that have a drastic effect on the life style of the population. To tackle such a problem, many methods have been suggested and even more are applied to fix the dunes or at least to limit their spreading so that to lessen the environmental impact. Such efforts were tried in many dune areas in Iraq, but it was in vain due to the classical nature of remedy that deals only with temporary and limited results, and in many cases worsening the problem. This is evidenced from the increased nature of dune fields in both area and problems.In this study four major dune fields expanding along four governorates in middle and southern Iraq were studied minerallogically, texturally, and chemically to attest their suitability as fine aggregate for concrete mixtures. These sands are composed of major quartz, feldspars, and calcite minerals, and are devoid of fines (clays), organic matters, and salts. Explicit dune sands of the studied area are not suitable as fine aggregate due to their poor grading, trial on mixing these sands with wellgraded river sand (Dibhdiba Formation Sand) in different proportions show that the 35% is optimal for normal load works. Al-Muthana dune sands show the highest evaluations. Missan dune sands were further tested for producing pavement interlock bricks, the results confirmed their aptness for exploitation both economically and environmentally. Journal of Science, 2017, Vol. 58, No.4A pp: 1874-1897 ‫بناء‬ ‫اد‬ ‫كمو‬ ‫الرممية‬ ‫الكثبان‬ ‫رمال‬ ‫استعمال‬ ‫الشاكري‬ ‫اد‬ ‫جو‬ ‫أحمد‬ IntroductionIraq for the past four decades has been and still suffering from desertification, in which vast agricultural areas are transformed into sand dune fields. This environmental depreciation can be attributed to several factors such as climate change that leads temperatures to increase and rainfall to decrease, besides reduction in surface water resources, non-systematic farming techniques, and intensive grazing. These factors cumulatively caused the vegetation cover to be disintegrated into barren land that is vulnerable to be areas of sand dune accumulations, or act as a direct and major source for wind-blown sands. The mode and area of distribution of sand dunes in Iraq is restricted within specific areas that are characterized and influenced by geological and geographical controls.The past ten years additional sand fields and areas were shaped within new expanses thus increasing the spatial distribution of dune regions into new belts and secondary grounds that were not classified as dune areas before. Many methods have been employed to restrict the sand movement and thus to control the distribution of sand dunes, such methods include the usage of heavy oil, digging tren...

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“…In Qatar, clay minerals were spotted in both fluvial and aeolian sediments with straight assumptions on their presence at various zone depths [1]. In Kuwait Bay, feldspars presence was recorded in suspended sediments up to 30% of total minerals [18], as well as the abundance of clay minerals amongst other minerals in different parts of the Bay, especially the south-eastern part [11].…”

Section: Introductionmentioning

confidence: 99%

“…The environmental impact assessment in Kuwait highlights the high daily volumes of fresh water required in quarries in the process of washing out undesirable minerals, besides the wastes disposal complications accompanying the elimination of flocculated matters [13]. All above being said and then added to the scarcity of many essential raw materials in the construction industry, the complex and sometimes multi-phased washing process of the natural or manufactured sands, with all implicated transportation costs and processing costs, made it imperative to start the pursuit for a solution [1,13]. A sustainable solution that reduces the complexity of screening out minerals and useful fine particles, helps in managing efficiently available sand reservoirs and untightens the strict specifications around fines in aggregates.…”

Section: Introductionmentioning

confidence: 99%

Practical technical solution for clay-contaminated sands used in concrete

Estephane¹,

Rieder

2017

MATEC Web Conf.

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Abstract. Sand, whether natural or manufactured, shows in many instances varying degrees of high levels of clay contamination. This fact is encountered in different parts of the globe and can lead to serious problems in adjusting concrete mix proportions and requiring high water to cement ratios and/or high dosages of superplasticizers without necessarily meeting the workability requirements, even when the sand is previously washed with fresh water. In this paper, different types of sand from the Gulf Cooperation Council (GCC) region are being screened, analysed for their clay contents and consequent effects on plastic concrete quality. A technical solution is being proposed based on engineered superplasticizers. A testing protocol has been established to verify the robustness of optimized mix designs demonstrating the performance of the admixture in terms of initial and extended workability. In particular, it will be demonstrated that the customized concrete admixtures constitute by themselves a stand-alone answer to the usage of clay-contaminated sands in concrete.

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Geological and physiochemical characterisation of construction sands in Qatar

Cited by 25 publications

References 4 publications

Migration of Barchan Dunes in Qatar–Controls of the Shamal, Teleconnections, Sea-Level Changes and Human Impact

Migration of Barchan Dunes in Qatar–Controls of the Shamal, Teleconnections, Sea-Level Changes and Human Impact

Uses of Sand Dunes as Building Materials

Practical technical solution for clay-contaminated sands used in concrete

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