Soil stabilization

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

Pozzolanic Reaction in Clayey Soils for Stabilization Purposes: A Classical Overview of Sustainable Transport Geotechnics

Abstract: Problematic soil stabilization processes involve the application of binders to improve the engineering properties of the soil This is done to change the undesirable properties of these soils to meet basic design standards However, very little attention has been given to the reactive phase of soil stabilization This phase is the most important in every stabilization protocol because it embodies the reactions that lead to the bonding of the dispersed particles of clayey soil Hence, this reactive phase is reviewed When clayey soils which make up the greatest fraction of expansive soil come in contact with moisture, they experience volume changes due to adsorbed moisture that forms films of double diffused layer on the particles When this happens, the clayey particles disperse and float, increasing the pore spaces or voids that exist in the soil mass Stabilizations of these soils are conducted to close the gaps between the dispersed clayey soil particles This is achieved by mixing additives that will release calcium, aluminum, silicon, etc, in the presence of adsorbed moisture, and a hydration reaction occurs This is followed by the displacement reaction based on the metallic order in the electrochemical series This causes a calcination reaction, a process whereby calcium displaces the hydrogen ions of the dipole adsorbed moisture and displaces the sodium ion responsible for the swelling potential of clayey soils These whole processes lead to a pozzolanic reaction, which finally forms calcium alumina-silica hydrate This formation is responsible for soil stabilization

Studies on time-granulated blast furnace slag as an alternative binder to cement

Abstract: This paper deals with the activation of granulated blast furnace slag (GBFS) and slag-fly ash/burn clay pozzolana mixes in presence of lime and lime with gypsum. The paper highlights the effectiveness of lime- GBFS mix with and without additives as an alternative binding material. It includes mortar studies and stabilisation of alluvial soil with lime-GBFS mixes. Investigations showed that strength development of 1:3 mortar was highest when 7.5 per cent gypsum was also added to lime-GBFS mix. The alluvial soils could be satisfactorily stabilised with both lime-GBFS and lime-GBFS with 7.5 per cent gypsum or by replacing 20 per cent of GBFS with fly ash. (A)

Influence of Waste Marble Dust on the Improvement of Expansive Clay Soils

Abstract: The marble process industry from Shaq Al-Thouban region, which is located in East Cairo, Egypt, produces a huge amount of marble wastes every day during the cutting and processing stages. Up to now, most of these wastes are dumping on open land which creates serious environmental problems. The amount of waste marble from the processing stage is about 20 to 25% of the total processed stone. Egypt also suffers from the problem of expansive soil that occupies a large area of its lands, especially in the new cities that are built on these lands. The primary purpose of this study is to use this waste material in the soil stabilization in point of view utilization of this waste as local low-cost materials and elimination of their negative environmental impacts. The waste marble dust was mixed with expansive soil samples with various percentages of 5%, 10%, 15%, 20%, and 25% by dry weight of soil. Different tests including Atterberg’s limits, standard Proctor compaction, unconfined compressive strength (UCS), California bearing ratio (CBR), swelling percentage, linear shrinkage (LS) tests, and XRF and XRD analyses were conducted for natural and marble dust stabilized soils. The soil mixtures used for UCS, CBR, and swell tests were compacted at the optimum moisture content (OMC) and maximum dry density (MDD) using the standard Proctor compaction method and cured for 7 days. The results of the tests showed that there are significant effects in enhancing the properties of expansive soils. Also, the results showed that as the percentage of the marble dust increases the plasticity index, the swelling potential of the expansive clayey soil decreases. Furthermore, the optimum moisture content decreases, and the maximum dry density increases. Also, UCS, CBR, and the calcite content of the soil mixtures increase with the increase in marble dust content.

Hazardous Waste Pollution Prevention Using Clay with Admixtures

Abstract: Landfill is the most commonly used method for disposal of waste materials since it is one of the least expensive methods. In order to dispose of any hazardous material to a landfill, a liner is used, which protects the underlying land and groundwater since it acts as a barrier to fluid movement. Of the various methods available for providing improved and more effective properties of landfills, methods involving the use of bentonite, cement, lime, gypsum, etc., have been explored in the laboratory. The aim is to overcome the problem and deficiencies of the existing liners. It is observed from the experimental results that the metal concentrations of the input waste solution can be reduced to 80-98% using a soil-cement admixture, 60-95% using a soil-gypsum mixture, 45-95% using a soil-bentonite mixture, 50-90% for soil, 35-80% using a soil-lime mixture, as liner materials. The permeation rate of different metals through the different soil-admixture media depends on various factors. A simple mathematical treatment of the phenomenon related to the permeation of liquid through the admixture of the clay and other components has been developed. The experimental results show satisfactory agreement with the predictions.