Soil stabilization

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

Characteristics of volcanic ash and natural lime based stabilized clayey soils

Abstract: Clayey soils are stabilized with various percentages of volcanic ash (VA), finely ground natural lime (NL), Portland cement, and their combinations. The influence of stabilizers and their combinations is evaluated through standard Proctor compaction, unconfined compressive strength, splitting tensile strength, modulus of elasticity, and California bearing ratio (CBR) tests. The durability of stabilized soil mixtures is judged based on drying shrinkage and the influence of water immersion on strength. Correlations between compressive strength, modulus of elasticity, and CBR are also established. Stabilized soil mixtures can be used in various constructions, including road pavements and low-cost housing.Key words: soil stabilization, volcanic ash, natural lime, mechanical properties, durability.

Properties of cement and lime-fly ash stabilized aggregate

Abstract: Potential application of cement-fly ashaggregate, lime-fly ash-aggregate and limecement-fly ash-aggregate mixtures in pavement construction is reviewed in this paper. Engineering properties such as moisturedensity relationship, compressive strength, flexural strength, dry shrinkage, and freeze-thaw durability are summarized on the basis of past studies. Dry shrinkage and freeze-thaw characteristics of cement and lime-fly ash-aggregate mixtures containing sub-bituminous, self-cementitious Alberta fly ashes were evaluated in the laboratory. The stabilized aggregates are attractive for use in pavement structures because of their high strength and low drying shrinkage characteristics. Lime-fly ash stabilized aggregates are observed to shrink more than cement-fly ash stabilized aggregate. It is also concluded that the materials investigated may perform reasonably well under moderate freeze-thaw conditions in the base courses of pavements. Further research should be conducted to evaluate durability of such materials under appropriate freezethaw conditions.

Development and Validation of a Two-Phase Model for Reinforced Soil by Considering Nonlinear Behavior of Matrix

Abstract: The paper presents the formulation of a two-phase system applied for reinforced soil media, which accounts for nonlinear behavior of matrix phase. In a two-phase material, the soil and inclusion are treated as two individual continuous media called matrix and reinforcement phases, respectively. The proposed algorithm is aimed to analyze the behavior of reinforced soil structures under operational condition focusing on geosynthetics-reinforced-soil (GRS) walls. The global behavior of such deformable structures is highly dependent to the soil behavior. By accounting for mechanical characteristics of the soil in GRS walls, a relatively simple soil model is introduced. The soil model is formulated in bounding surface plasticity framework. The inclusion is regarded as a tensile two-dimensional element, which owns a linear elastic-perfectly plastic behavior. Perfect bonding between phases is assumed in the algorithm. For validation of the proposed model, the behavior of several single element reinforced soil sa...

Use of cement by-pass dust in soil stabilization

Abstract: Cement by-pass dust (CBPD) or cement kiln dust (CKD) is a by-product of the manufacture of Portland cement It is generated during the calcining process in the kiln Lime (CaO) constitutes more than 60% of CBPD composition Other compounds include Si02, Ah03, F~03, K20, Na20, Cr, etc Oman Cement Company generates about 25,000 to 30,000 tons of CBPD every year Some CBPD is used as a filler for road asphalting The remainder of the CBPD is disposed of on-site without any further reuse or reclamation As such research was carried out to investigate beneficial reuses of CBPD in the Sultanate of Oman This paper presents the results of a study that investigated the use of CBPD in the stabilization of an expansive clay The soil was stabilized with 0, 3, 6, and 9% CBPD Mixtures were subjected to the following tests: (1) Atterberg limits, (2) pH, (3) compaction, (4) California Bearing Ratio (CBR), (5) swell percent and (6) swell pressure Results indicate that as cement by-pass dust content increases, the swell percent and maximum dry density decrease while the pH and CBR values tend to increase Thus, CBPD could potentially act similar to lime or cement in improving the properties of clayey or silty soils

Identification and stabilization methods for problematic silt soils

Abstract: Many areas of Louisiana consist of soils with high silt contents, low strengths, and minimal bearing capacity. Construction traffic in these soils can cause detrimental pumping action in areas with a high water table. These wet subgrades under Louisiana pavements cause both construction and performance problems. Common solutions to the problem include excavation and replacement, lime treatment, or cement stabilization. Special provisions are often included in the contract for chemical additives in lieu of undercutting. The research emphasis of this study was placed on efforts to refine the pumping problem and on the development of guidelines for identifying the problem silt-soils. Secondary importance was given to the identification of alternate methods for stabilization. The study consisted of two phases. Phase 1 documented the field experiences of the Louisiana Department of Transportation and Development (DOTD) districts. Phase 2 consisted of a testing program to investigate the nature of the problem, the character of the silt materials, and their performance with modifying and stabilizing agents. Eight soil samples from four of the DOTD districts were used in the laboratory program. The soils were typical examples of those commonly encountered with a high-silt content. Several were acquired from current projects in which pumping problems were occurring. The basic characteristic-parameters of the natural samples were determined with standard laboratory tests. The response and stability of the silts under compaction and loading with various moisture levels and compaction efforts were also tested. The susceptibility to pumping of the different samples was reviewed in terms of their physical characteristics. In addition to the silt content percentage, the plasticity character was noted as significant during testing. Anomalies were also found to exist between the DOTD's earthwork specifications and the physical properties of the high silt-content soils. The potential for the modification and stabilization of the problem silt soils was also studied. The laboratory tests were selected with respect to construction needs and possible post construction conditions. A limited number of specific additives were proposed with consideration for their ability to dry the subgrade silts sufficiently in order that they be compacted and with the strength to provide a working table for the construction of the base and pavement. The additives selected included hydrated lime, portland cement, and Class C fly ash. Limited tests for evaluating long-period stability of the stabilized silt-subgrade subjected to accelerated curing followed by vacuum-saturation conditions were also conducted.