Soil stabilization

About: Soil stabilization is a research topic. Over the lifetime, 3161 publications have been published within this topic receiving 48437 citations.

Durability of Cement Stabilized Low Plasticity Soils

Abstract: Three testing methods for predicting the durability of cement-stabilized soils—the tube suction (TS), 7-day unconfined compression strength (UCS), and wetting–drying durability tests—were tested and compared for their correlations and influence factors using a problematic low plastic silt clay from subgrade commonly encountered in Louisiana. A series of samples was molded at six different cement dosages (2.5, 4.5, 6.5, 8.5, 10.5, and 12.5% by dry weight of the soil) and four different molding moisture contents (15.5, 18.5, 21.5, and 24.5%). The test results indicate that the water–cement ratio of cement-stabilized soil had the dominant influence on the maximum dielectric value (DV), 7-day UCS, and durability of stabilized samples tested, although the dry unit weight of cement-stabilized soil could cause the variation of the results. This study confirms that TS, 7-day UCS, and wetting-drying durability tests are equivalent in predicting durability, and tentative charts to ensuring the durability of cement-...

Use of cement kiln dust in cement concrete and its leachate characteristics

Abstract: Due to continuous increase in industrial globalization and generation of waste, solid waste management has become one of the major global environmental issue. Cement kiln dust (CKD) is one of such industrial waste or by product which is progressively significant environmental concern related to its emission and disposal. CKD is fine grained, solid, highly alkaline particulate material chiefly composed of oxidized, anhydrous, micron-sized particles collected from electrostatic precipitators during the production of cement clinker. Cement kiln dust so generated is partly reused in cement plants and landfilled. Due to lack of landfilling space and ever increasing disposal cost, utilization of CKD in highway uses, waste treatment, soil stabilization, cement mortar/concrete, CLSM, etc. has become an attractive alternative to its disposal. The leachate obtained from cement kiln dust may contain hazardous compounds and its caustic nature poses harmful effects to the environment. So, it is essential to know the characteristics of leachate obtained from CKD for beneficial utilization towards solid waste management. Several studies have shown that CKD could be used in making cement paste/mortar/concrete. This paper presents the overview of some of the research published on the beneficial use of CKD in construction materials, reducing carbon dioxide emissions and CKD leachate characteristics. Effect of CKD on the cement paste/mortar/concrete properties like compressive strength, tensile strength, durability, hydration, electrical conductivity, etc. and leachate test methods and leachate characteristics of cement kiln dust is also discussed in this paper.

Variables Governing Strength of Compacted Soil–Fly Ash–Lime Mixtures

Abstract: The practice of treating soil with fly ash and lime is an attractive technique when the project requires improvement of the local soil for the construction of stabilized bases under pavements, as a support layer for shallow foundations, to strengthen slopes in slope stability problems, and to prevent sand liquefaction. Currently, efforts are being made to develop dosage methodologies for improved soils based on a rational criterion as it exists in concrete technology, in which the water-cement ratio plays a fundamental role in the assessment of the target strength. This study evaluates the strength controlling parameters of a sandy soil treated with fly ash and lime and shows that the voids-lime (η=Lv) ratio (corresponding to porosity divided by the volumetric lime content) plays a fundamental role in the assessment of the target strength. The controlling parameters evaluated were the amount of fly ash, quantity of lime, porosity, and voids-lime ratio. A number of unconfined compression tests and suction measurements were carried out in the present work. The results show that the unconfined com- pressive strength (UCS) increased linearly with the amount of lime for soil-fly ash-lime mixtures. A power function adapts better to the relation UCS-porosity (η) for soil-fly ash-lime mixtures. The ratio η=Lv, in which Lv is adjusted by an exponent (in this case 0.12 for all soil- fly ash-lime mixtures studied), is shown to be a good parameter in the evaluation of the UCS of the soil studied (UCS varies nonlinearly with η=Lv in the case of fly ash-lime addition). Finally, it was found that a unique correlation controls the strength of the compacted soil-fly ash-lime mixtures studied; consequently, using this relationship an engineer (considering the specifics of each case such as price, availability, and cost of transportation of each material, among others) can choose the amount of lime, the quantity of fly ash, and the compaction effort appropriate to provide a mixture that meets the strength required by a project at the optimum cost. DOI: 10.1061/(ASCE)MT.1943-5533 .0000186. © 2011 American Society of Civil Engineers. CE Database subject headings: Soil compaction; Fly ash; Lime; Compression tests; Mixtures. Author keywords: Compaction; Fly ash; Lime; Voids-lime ratio; Unconfined compression tests.

Sustainable binders for soil stabilisation

Abstract: Portland cement is the most commonly and widely used binder in ground improvement soil stabilisation applications. However, many changes are now affecting the selection and application of stabilisation additives. These include the significant environmental impacts of Portland cement, increased use of industrial by-products and their variability, increased range of application of binders and the development of alternative cements and novel additives with enhanced environmental and technical performance. This paper presents results from a number of research projects on the application of a number of Portland cement-blended binders, which offer sustainability advantages over Portland cement alone, in soil stabilisation. The blend materials included ground granulated blastfurnace slag, pulverised fuel ash, cement kiln dust, zeolite and reactive magnesia and stabilised soils, ranging from sand and gravel to clay, and were assessed based on their mechanical performance and durability. The results are presented ...