Soil stabilization

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

Further evaluation of promising chemical additives for accelerating hardening of soil-lime-fly ash mixtures

Abstract: THE RESULTS OF AN INVESTIGATION ON THE EFFECT OF SEVERAL AMOUNTS OF 12 CHEMICALS ON THE STRENGTH OF A MIXTURE OF OTTAWA SAND-LIME-FLY ASH ARE PRESENTED. THE EFFECTS OF FOUR SELECTED CHEMICAL ADDITIVES ON THE STRENGTH OF SOIL-LIME-FLY ASH MIXES-INCLUDING FOUR SOILS, TWO LIMES AND THREE FLY ASHES-ARE ALSO PRESENTED. AN EVALUATION OF COMPETITIVE MIXES OF SOIL-LIME-FLY ASH WAS MADE, INCLUDING FREEZE-AND-THAW STUDIES. /AUTHOR/

A new experimental approach to the improvement of sandy soils with construction demolition waste and cement

Abstract: Soil improvement has become an important issue on which further investigations should have to be performed in depth as a result of an increasing demand rate on land use in order to compensate increasing population The main reasons for soil improvement are to decrease plasticity, reduce permeability and compressibility and increase soil strength Wastes can be used along with some other additive materials such as cement, lime, fly ash, and bitumen in the improvement of soils which are inadequate in terms of engineering properties In recent years, as a result of increasing rates of earthquakes along with the numbers of constructions which are to be demolished as the updated regulations point out, a great amount of wastes have been accumulating These wastes are generally referred to as construction demolition wastes (CDW) There exist some methods which are considered for the elimination of these wastes One of the mentioned methods is to use construction demolition wastes in soil improvement procedures Within the context of this study, effects of construction demolition wastes (CDW) and cement (CMT) on soil stabilization and engineering properties of sandy soils (SS) were investigated Parameters such as optimum ratios of CDW and CMT, bearing capacity and settlement values, soil improvement depths, and time factor were analyzed Consequently, an equation with high-degree correlations was obtained in order to use CDW and CMT efficiently at optimum ratios It was determined that by using CDW, increments of up to 309 times were attained in the values of bearing capacities The optimum value of improvement depth for sandy soil was obtained as H/D = 075 (H: soil improvement depth, D: diameter of the model footing) up to a pressure value of 520 kPa It was also found that the highest bearing capacity with respect to time was reached at the end of 28 days and a significant increment did not take place in the values of bearing capacities after exceeding the mentioned time period Therefore, it is proposed that at least 28 days should pass after the completion of any soil improvement procedure before any further construction work is initiated

Durability of geosynthetic soil reinforcement elements in tanque verde retaining wall structures

Abstract: The findings of an investigation into the stability and durability of high-density polyethylene (HDPE) geogrid soil reinforcing elements used in grade separation structures on a project at the Tanque Verde-Wrightstown-Pantano Roads intersection in Tucson, Arizona, is documented. The project represents the first use of geogrid reinforcement in concrete-faced, mechanically stabilized earth retaining walls in a major transportation-related application in North America. The reinforced soil walls were constructed in 1984 and 1985, and the geogrids have been in service for 8 to 9 years in an elevated temperature environment that accelerates the mechanisms of degradation. The combined effects of age and temperature exposure made this project a candidate for evaluation of geosynthetic reinforcement stability and durability. A sample retrieved from the project was subjected to a series of laboratory procedures and tests. Results of the tests are presented as topological analysis, ultimate tensile strength, ultimate tensile strain, 1,000-hr creep response, melt rheology, melt temperature range, crystallinity, and oxidative induction times. Test results are compared to archived geogrid values. Soil samples also were retrieved and analyzed. It is concluded that after more than 8 years of exposure to an elevated temperature environment, the exhumed HDPE geogrid has not experienced any significant change in the physical and performance properties of the geogrid or the morphological properties of the HDPE.

A review of the stabilisation techniques on expansive soils.

Abstract: Background: One of the problems in geotechnical engineering is the presence of unsuitable soils on project sites. Some soils, called reactive soils, exhibit deviations in volume due to climatic variations causing a big concern during the structural designing of pavements and foundations on these soils and the post-construction stability of such structures. Objective: There are several soil stabilisation approaches to counter the hazards presented by these soils. This paper elaborates various studies on the current soil stabilisation techniques. Results: The conventional methods to improve texture, plasticity and strength of the soils include mechanical stabilisation by blending of different soils, compaction controlled soil replacement, surcharge loading, pre-wetting or chemical stabilisation by introducing specific percentages of additives like fly ash, slag, gypsum, cement and lime. Alternative and greener stabilisation techniques like scrap tires, polymers, fibers and recycled materials. Conclusion: Each method has its merits and demerits in terms of efficiency, cost-effectiveness and environmental concerns.

Stabilization of Crushed Basaltic Rocks and Clay Mixtures Using Cementitious Additives

Abstract: In situ stabilization using cementitious binders has become a common activity for rehabilitating degraded road pavements in Australia. Industrial waste products mixed with traditional binders like general-purpose portland (GP) cement or limes are used as cementitious binders. This paper presents the stabilization of crushed basaltic rocks and clay mixtures using three cementitious binders, namely, general-purpose cement, blended cement (GB), and a binder involving alkali-activated slag (AAS). The good-quality crushed rock was mixed with reactive fine-grained soil (clay) to represent possible field scenarios in reconstructing degraded pavements. The unconfined compressive strengths of the stabilized material at 1-day, 7-day, and 28-day curing stages were measured for varying binder content. The experimental results clearly indicated that mixing clay with good-quality crushed rock can significantly reduce the stabilization potential of the pavement material. It was also observed that the binders with industrial waste products performed well in comparison with the traditional GP cement binder.