Showing papers on "Soil stabilization published in 1983"

Plastic Limit Behavior of Reinforced Earth

Abstract: Plastic behavior of soil that is uniformly reinforced by fibers is studied. This analysis considers reinforced earth as macroscopically anisotropic and homogeneous, and it describes its gross behavior based on a knowledge of the mechanical properties and interactive contribution of each component. The rigid plastic model of reinforced earth is developed and an application of the proposed model is given. Experimental results are given.

Stabilization of silt: a case study for low-volume roads in saudi arabia

Abstract: Although there is generally a reasonable justification for using lime stabilization for clays and cement or bitumen for sandy soils, no such generalization exists for silts. The range of the applicability of several stabilization techniques to silts is investigated. The main objective of the investigation was to determine the type and quantity of stabilizer(s) suitable for silty soils, which dominate the surface geology of Saudi Arabia. A soil-cement-bitumen model that results in the best mixture performance is presented, and optimum additive percentages are suggested. A physicochemical explanation for such performance is provided. The analysis is based on experimental results obtained from compaction, California bearing ratio, unconfined compression, and modified Marshall tests. It is shown that modification of the silt with 2-3 percent cement followed by stabilization with about 4 percent bitumen gives overall a satisfactory mixture. Such a mixture may be used in the construction of low-volume, low-cost roads or as a subgrade material for paved roads. The proposed mix design is more favorable from the standpoint of strength, durability, and economics than bitumen or cement stabilization, the use of which would require at least 7 and 8 percent, respectively, as minimum stabilizer contents. (Author)

Chemical stabilization of subgrade soil for the strategic expeditionary landing field

Abstract: : The Strategic Expeditionary Landing Field (SELF) is a military expeditionary-type airfield with an aluminum matted surface that is designed for sustained tactical and cargo airlift operations in an amphibious objective area. Because of the operational traffic parameters such as loads of the various types of aircraft, tire pressures and volume of traffic, a base layer must be constructed over subgrade soil support conditions which may be only marginal. The base layer could be constructed with conventional soil construction techniques (compaction) and yield the required strength. It would be difficult, however, to maintain this strength for the required one-year service life under many climatic conditions due to the degrading effects of water on the support capacity of many soils. Chemical soil stabilization with lime, portland cement and asphalt stabilizing agents could be used to treat the soil. These additives, when properly mixed with certain types of soils, initiate reactions which will increase soil support strength and enhance durability (resistance to the degrading effects of water). Technically, this procedure is quite viable but logistically, it may not be feasible.

Cement-bound materials for sub-bases and roadbases, material selection and mix design, construction and control testing

Abstract: This handbook is intended for the user on site of cement-bound sub-bases and roadbases. It does not cover pavement thickness design or specification; nor is it intended to cover other aspects of cement stabilization, such as subgrade improvement, although much of the handbook is directly applicable. The first section describes the types of site-produced materials suitable for cement stabilization, the site investigation necessary to establish their suitability and the subsequent mix design procedure. In the second section construction of cement-bound layers by mix-in-plant and by mix-in-place methods is described. Layouts, compaction, curing and protection, choice of method and reinstatement are discussed. The third section deals with control testing. Types of test, production control testing and compliance testing are discussed. (TRRL)

Reinforced Soil Beams

Abstract: A series of reinforced soil beams with varying reinforcements were tested to study the improvement in the flexural characteristics of soil beams. A small percentage of reinforcement in the form of metallic strips is observed to impart substantial improvement in the load carrying capacity and flexibility to the soil beams.

Bituminous stabilization of fine sands: construction of the baiomori-g -ashua road, nigeria.

Abstract: Bitumen has been used to produce road base material in regions of cohesionless soil for many years. The engineer, however, invariably faces the problem of reconciling the properties of a given soil with available binders and processes to produce base material having the required properties. The paper describes the investigational work leading to preproduction trials which was followed by successful road construction in an area of aeolian sand in northern Nigeria. (Author/TRRL)

Relevance of soil stabilization techniques in low cost road construction

Abstract: This Paper brings out the relevance of soil stabilization techniques towards the development of our road network more scientifically, economically and expeditiously. Efforts made over the past three to four decades on different methods of soil stabilization including the recent scientifically designed test tracks incorporating reduced pavement thicknesses for rural roads have been highlighted. A broad appraisal has been presented of the performance of various stabilised soil experimental lengths and test tracks the related economies effected and the increased employment potential. It has been concluded that these techniques having stood the test of time, should now be widely accepted by the various roaad construction agencies in India, and that such an acceptance should not be postponed any longer. (Author)

Update on fly ash technology relating to highway construction : January 1983

Abstract: This report abstracts the information concerning the use of fly ash in highway construction contained in the Proceedings of the Sixth International Ash Utilization Symposium held March 7-10, 1982, at Reno, Nevada. The Proceedings include 54 papers, only 25 of which are abstracted. Some of the information has been previously reported but new evaluations, particularly for fly ashes obtained from sub-bituminous coal, are presented. The papers reviewed show the successful use of fly ash as a filler in asphalt pavements, for soil stabilization, for base course construction, in hydraulic cement concrete, and as a grout for "mud-jacking" portland cement concrete pavements. These developments reflect the growing use and importance of fly ash in highway construction and the need for all highway engineers to become aware of its potential.

Solid substance for soil stabilization

Abstract: PURPOSE:To provide the titled solid substance which is prepared by compression molding of a mixture of cement, quick lime, aluminum powder and binder and solidifies the ground completely when mixed with soil, laid in torn-up road, etc. and pressed by means of a vibrotamper, etc. CONSTITUTION:A mixture of 20-60pts.wt. cement, 20-70pts.wt. quick lime, 0.01-0.1pt.wt. aluminum powder and 1-10pts.wt. non-aqueous binder (e.g. a mixture of spindle oil and emulsion) in formed into granules, flat spheres, flakes, etc. In the refilling work after laying of earthen pipe, etc. underground, the solid substance is dispersed in soil or laid in layers and rolled or pressed by means of rammer or vibrotamper. The solid substance absorbs moisture in soil, swells and hardens and generates hydrogen. The expansion energy of hydrogen increases internal pressure and enhances the effect of rolling and pressing, thus making it possible to complete solidification of ground in a few hours and performing pavement work without delay.