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Soil stabilization

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


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Journal ArticleDOI
TL;DR: In this paper, the minimum subgrade strength required to sustain anticipated construction tire contact stresses during construction is determined and a criterion is proposed for determining when subgrade stabilization is needed and methods of selecting the design sub grade strength are examined.
Abstract: Selection of design strengths of soil subgrades and subgrades treated with cement or hydrated lime is a problem in pavement design analysis and construction. Different types of soils may exist in a highway corridor and different strengths may exist after the soils are compacted to form the pavement subgrade. The selected subgrade strength will largely affect the pavement thickness obtained from the design analysis, future pavement performance, and the overall bearing capacities of the subgrade during construction and the pavement structure after construction. In developing the proposed selection scheme, a newly developed mathematical model, based on limit equilibrium, is used. Relationships among undrained shear strength [or California bearing ratio (CBR)] and tire contact stresses are developed for factors of safety 1.0 and 1.5. The minimum subgrade strength required to sustain anticipated construction tire contact stresses during construction is determined. A criterion is proposed for determining when subgrade stabilization is needed and methods of selecting the design subgrade strength are examined. A least-cost analysis appears to be an appropriate approach as shown by analysis of a case study involving pavement failures. Two case studies show that soaked laboratory strengths appear to be fairly representative of long-term field subgrade strengths. Hence, using soaked laboratory strengths and least-cost analysis appears to be a reasonable means for selecting the design strength of subgrades for pavement analysis. To avoid failures of chemically stabilized layers, relationships among thicknesses of chemically treated layers and the CBR values of the untreated subgrade for a factor of safety of 1.5 are presented.

12 citations

Proceedings ArticleDOI
21 Mar 2019
TL;DR: In this paper, a stabilization alternative for expansive soils was studied using MICP, where indigenous bacteria were stimulated by mixing enrichment and cementation solutions with expansive natural soils to precipitate calcium carbonate.
Abstract: Expansive soils, also known as swell-shrink soils, undergo substantial volumetric changes due to moisture fluctuations from seasonal variations. These volumetric changes cause millions of dollars in damages annually. Microbial Induced Calcite Precipitation (MICP) is a promising soil improvement technique, which uses urease producing bacteria to precipitate calcium carbonate. In this study, a stabilization alternative for expansive soils was studied using MICP. Specifically, indigenous bacteria were stimulated by mixing enrichment and cementation solutions with expansive natural soils to precipitate calcium carbonate and make soil stronger and less expansive. This study examined three expansive soils with varying plasticity and mineralogical characteristics. Two protocols for shallow mixing were studied. In Protocol-1, soil samples were mixed with enrichment solutions at optimum moisture content and allowed to mellow for 1, 2, 3, and 4 days. In Protocol-2, soil samples were mixed with enrichment solutions at moisture content corresponding to 95% of maximum dry unit weight on the wet-side of a standard Proctor curve. Moisture was allowed to escape from the mix during the mellowing period under both protocols. Following the mellowing periods, the lost moisture is replaced with cementation solution to reach optimum moisture content, and the soil sample was compacted to its maximum dry unit weight. Unconfined compression strength test was used to evaluate the strength improvements due to treatments. The treatment effectiveness was also evaluated with measurements of calcium carbonate precipitation. The results show promise for this method as an alternative to current shallow stabilization methods. An increase in mellowing period for low and medium plastic soils was determined to be beneficial. The current results also showed that the presence of higher amounts of enrichment solution and addition of less cementation solution is not advantageous for this procedure based on the performance of Protocol-2.

12 citations

01 Jan 1996
TL;DR: In this article, the authors present a series of papers on both laboratory and field investigations, as well as constitutive modeling efforts, that all deal with the time dependence of soils and its influence on their response to loading.
Abstract: This proceedings presents a series of papers on both laboratory and field investigations, as well as constitutive modeling efforts, that all deal with the time dependence of soils and its influence on their response to loading. Two state of the art summaries, one on laboratory and field investigations, and one on modeling, are presented to provide overviews of the current state of knowledge. Papers are included dealing with a variety of areas in which time effects play a role. These include soil reinforcement applications and cyclic behavior, as well as the range of identified time dependent behavior, i.e., creep, relaxation, constant strain rate and consolidation. A wide range of soil types are described, including sands, marine clays, weathered tropical clays, glacial till, high plasticity clays, and structured soils. The influence of other factors such as temperature, degree of soil structure and loading conditions (e.g., cyclic, plane strain and triaxial) are taken into account. The papers in the volume are intended to provide an update on the state of knowledge and new application areas in which time dependent behavior plays a critical role.

12 citations

Patent
03 Dec 2009
TL;DR: In this paper, a solution of soluble sodium silicate applied at the disclosed application rate to improve the load bearing capacity for a roadway was proposed to maximize the stabilization of road beds.
Abstract: A composition comprises a solution of soluble sodium silicate applied at the disclosed application rate to improve the load bearing capacity for a roadway. The method of the invention addresses the application of the disclosed composition to maximize stabilization of road beds.

12 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202364
2022128
2021213
2020167
2019173
2018168