A model study on accelerated consolidation of coir reinforced. From the observations of failure pattern it can be. Fiber inclusions were found to improve the postpeak behavior of the soil. Bulk density is a measure of how sand or soil compacts when subjected to compactive force. With increasing fiber content, there is an initial increase followed by a decrease and the optimal fiber content is found to be in the range of 0. Guidelines for the use of fiber reinforced soil frs. Desiccation cracking behavior of polypropylene fiberreinforced clayey soil article pdf available in canadian geotechnical journal 499. Fiber reinforced soil frs is essentially polypropylene fibers mixed with soil to reinforce the soil mass against shear or tensile failure. However, the technique requires extensive testing on soil and fiber samples before it can be implemented.
Model tests and numerical analyses of fiberreinforced embankments under rainfall and seepage conditions were also performed. It is difficult to find location that has perfect soil. The location of the fracture surface of the sisal fiber reinforced soil conformed to mohrcoulomb strength theory. Stalok fiber also has showed increases in total porosity of 11%, including air filled porosity at 14%, as a result the infiltration rate of water is also increased. Its most effective, efficient soilreinforcement method on the market. Understanding effect of freezing phenomenon in a fiberreinforced soil structure is essential to foundation technology, road construction and earthwork application in cold region. This broad definition encompasses many and varied applications. Expired lifetime application number us06914,871 inventor w. A model study on accelerated consolidation of coir. Comparative mechanical behaviors of four fiberreinforced. Discrete fiber inclusion is an effective way to enhance soil ductility. With fiber soils patented soil reinforcement, youll be able to do things with turf and dirt you might have thought was impossible. Included are recommendations for trenching, placing pipe, joining pipe, placing and compacting backfill, and monitoring deflection levels. This page contains fiberreinforced concrete frc seminar and ppt with pdf report.
The main objective of this study is to investigate the use of waste fiber materials in geotechnical applications and to evaluate the effects of waste polypropylene fibers on shear strength of unsaturated soil by carrying out direct shear tests and. Plastic fibre reinforced soil blocks as a sustainable. Naturally occurring asbestos fibers and vegetable fibers, such as sisal and jute, are also used for reinforcement. Experimental study of cement stabilized fiber reinforced. Rajkumar 1211103070 in partial fulfilment for the award of the degree of bachelor of engineering in civil engineering velammal engineering college, chennai anna universitychennai 600 025 april 2015. Mar 22, 2017 understanding effect of freezing phenomenon in a fiber reinforced soil structure is essential to foundation technology, road construction and earthwork application in cold region. Soil fiber reinforcement fiberglass threads, termed roving, can be used to reinforce cohesionless soils, like this cylinder of sand the volume of fiberglass fibers is between 0. Modeling the pullout behavior of short fiber in reinforced. Fiber reinforced concrete can be defined as a composite material consisting of mixtures of cement, mortar or concrete and discontinuous, discrete, uniformly dispersed suitable fibers. Park, play, build, plant, trench and drive its time to expect more from your land. However shear values are greater than unreinforced soil. Most buildings and other civil engineering construction projects are started as raw land.
Model tests and numerical analyses of fiber reinforced embankments under rainfall and seepage conditions were also performed. Continuous meshes, woven fabrics and long wires or rods are not considered. Evaluation of the stressstrain curve of the fiberreinforced soil indicates that mobilization of the fiber tension generally requires a strain level higher than that corresponding to the peak strength of unreinforced soil. Rajkumar 1211103070 in partial fulfilment for the award of the degree of bachelor of engineering in civil engineering velammal engineering college. Soil reinforcement with natural fibers for lowincome housing. At present, many studies have been conducted to experimentally determine the mechanical properties of fiberreinforced soil. The gravimetric fiber content, w, typically used in construction specifications, is defined as.
Guidance for installation of fiberglass pipe in subaqueous. Using slippage theory to analyze shear behavior of loop. Fiberreinforced concrete frc is concrete consisting fibrous material which increases its structural purity. The equivalent shear strength of fiberreinforced soil can be predicted using the discrete framework by the independent characterization of soil and of. Fiber reinforced soil is effective in all types of soils i. The first step to be performed is site investigation in order to know the situation of the site. Pdf tensile strength of fiber reinforced soil researchgate. Fiberreinforced internally unstable soil against suffusion. Modeling the pullout behavior of short fiber in reinforced soil. The dry unit weight of the fiber reinforced soil composite, d, is defined as.
A related method for improving the engineering properties of soil includes the steps of adding from about 0. Fiberglass fibers, however, were generally found to be detrimental to durability. In the discrete framework proposed by zornberg 2002 for limit equilibrium analysis of. Fiber reinforced soilcement american concrete institute. In this study, we collaboratively utilized these two techniques for soil reinforcement. Fiberreinforced concrete frc seminar and ppt with pdf report. Strength behaviour of cohesive soils reinforced with fibers. Pmcs can be subdivided into two categories, based on whether the fiber reinforcement is continuous or discontinuous. Shear stresses in the soil mobilize tensile resistance in the fibers, which in turn imparts greater strength to the soil. Tensile strength of fiber reinforced soil article pdf available in journal of materials in civil engineering 287 january 2016 with 1,504 reads how we measure reads. Use of natural material such as jute, coir, sisal and bamboo, as reinforcing materials in soil is. Swell and compressibility of fiber reinforced expansive soils. Turf reinforcement technology stabilizer solutions. The blocks were tested for density, and compressive strength, and observed failure patterns were analysed.
Up to a critical fiber content shear strength increased considerably and later small reduction is observed. Stabilization of black cotton soil using fly ash and nylon fibre. Model studies on geofiberreinforced soil 948 liner construction material for landfill covers, especially when high mechanical and thermal loadings are anticipated. After final failure, the soil fibre composite was not disintegrated completely in contrast to blocks with raw soil. The randomly distributed fibers capture and redistribute loads through their tensile strength, mobilizing a wider mass of soil, which in turn greatly improve the mechanical response of the material.
The shear strength of fiber reinforced soil is improved due to the addition of the waste plastic fibers and it is a non linear function. Thus there is significant increase in cbr value of soil. Strength and stiffness response of itanagar soil reinforced. Shear strength behaviour of bamboo fiber reinforced soil. Fiber reinforced soil pullout stress softening interaction mechanism progressive failure 1. Because preparation of identical samples of jute fiber reinforced soil beyond 1 % fiber content was not possible in the laboratory hence the present investigation was restricted up to 1 % of the fiber content only. Although research performed over the last few decades has evaluated certain fiber reinforced soil properties and formations, the development of constitutive models for fiber reinforced soil has lagged. Effect of discrete fibre reinforcement on soil tensile strength. These studies highlighted that the use of fiber reinforced soil as backfill possessed the combined merits of improvement in both mechanical and hydraulic performance of soil.
Civil and environmental engineering department king fahd university of petroleum and minerals fibersreinforced soil soil and site improvement ce 553. Mar 07, 2017 the soil must have a moisture content suitable for compaction. Effect of randomly distributed polypropylene fiber. The main objective of this study is to investigate the use of waste fiber materials in geotechnical applications and to evaluate the effects of waste polypropylene. Singh oct 2012 studied soil reinforcement with jute geotextile layers. The standard fiberreinforced soil is defined as a soil mass that contains randomly distributed, discrete elements, i. Two types of fiberreinforcing soil based on the distribution of fiber within the soil, patternfibrous and randomlydistributed. Pdf model footing tests on fiber reinforced soil semantic scholar.
The term reinforced soil generally refers to the former one, although it may more be appropriately called systematically reinforced soil, whereas latter one is called randomly distributedoriented fibrereinforced soil or simply fibrereinforced soil shukla et al. The difficulty in determining creep strains and pore pressures in fiber soil mixtures is that no measurements can be made at the fiber soil interfaces. Pdf plastic fibre reinforced soil blocks as a sustainable. The dry unit weight of the fiberreinforced soil composite, d, is defined as. Unconfined compression test results indicate that the ucs of polypropylene fiberreinforced soil is greater than those of the parent soil. This research aims to present the results of experimental investigation relative to the unconsolidatedundrained triaxial compression behavior of finegrained soil as a function of freezethaw cycles and. Effect of fiber content on ucs of fiber reinforced soil. Plastic as a soil stabilzer seminar report, ppt, pdf for. Stabilisation of the soil was done by adding cement, lime and their combination. Furthermore, it is observed that the tensile strength of fibre reinforced soil is dominated by fibre pullout resistance, depending on the interfacial mechanical. Also explore the seminar topics paper on plastic as a soil stabilzer with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2017 2018. The first step to be performed is site investigation. Mobilization of reinforcement forces in fiberreinforced soil.
The reinforced mixtures can include additives for partially solidifying the aqueous soil mixture, such as calciumcontaining materials, cementitious materials, siliconcontaining materials, aluminumcontaining. Introduction the concept of reinforcing soils by introducing tensionresisting elements, such as. Its most effective, efficient soil reinforcement method on the market. Effect of freezethaw cycles on triaxial strength properties. Plastic fibre in chopped form from carry bags and mineral water bottles were added 0. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Stalok fiber has greater resistance to compaction and therefore a low bulk density. Fiberreinforced soil, in which soil is mixed with an appropriate amount of fiber, has many applications in earthwork construction, such as soil modification, roadway embankment reinforcement, and earth slopes. Waste plastic fiber reinforced soil a project report submitted by anniruth kannan r. Conclusions triaxial test results indicate that the stressstrain behavior of soil is improved by incorporating coir fibers in the silty soil, and that the deviator stress at failure is. What is fiber reinforced soil what is fiber reinforced soil.
It holds short discrete fibers that are uniformly distributed and circumstances oriented. The addition of fibersoils synthetic fibers significantly improves the resilience and durability of the turf area while minimizing soil compaction. Fiberreinforced concrete frc is concrete made primarily of hydraulic cements, aggregates, and discrete reinforcing fibers. In the case of higher preloads, the rct values for randomly reinforced soil with vertical drains were moderate with an average value of 30. Pdf most buildings and other civil engineering construction projects are started as raw land. Effect of fiber length on ucs of fiber reinforced soil. The proposed model indicated that both fiber parameters and ambient conditions determine shear strength of a fibersoil composite.
The present invention provides semisolid and reinforced soil mixtures formed from aqueous soil mixtures such as dredge material, discrete reinforcing fibers such as glass fibers. These results indicate that mohrcoulomb strength theory is suitable for evaluating the mechanical properties of the sisal fiber reinforced soil for fiber lengths of less than 10 mm. Thus there is significant increase in cbr value of soil reinforced with jute fiber and increase in cbr value will substantially reduce the thickness of pavement subgrade. Copyright by chunling li 2005 the university of texas at austin.
Fiber reinforced soil behaves as a composite material in which fibers of relatively high tensile strength are embedded in a matrix of soil. In view of substantial increases observed in tensile splitting strength, ductility, durability, and confinement, it is suggested that fiber reinforced soilcement might be applied in the construction of soilcement liners for reservoirs and landfills. These studies highlighted that the use of fiberreinforced soil as backfill possessed the combined merits of improvement. These elements support the backfill and keeps the reinforcement at a desired elevation in the reinforced soil wall and also protect the. Fiberreinforced concrete seminar ppt with pdf report. This research aims to present the results of experimental investigation relative to the unconsolidatedundrained triaxial compression behavior of finegrained soil as a function of freezethaw cycles and fiber volume. These elements support the backfill and keeps the reinforcement at a desired elevation in the reinforced soil wall and also protect the granular at the edge falling off. Plate load test on fiberreinforced soil article pdf available in journal of geotechnical and geoenvironmental engineering 12910. The ph of the reinforced soil mixture can be adjusted to control deterioration of the reinforcing fibers, as desired. Fibers suitable for reinforcing concrete have been produced from steel, glass, and organic polymers synthetic fibers. Assessment of the mechanical properties of sisal fiber. Fiber reinforced concrete are of different types and properties with many advantages. Geotechnical engineers often encounters problems in designing foundations of structures on highly compressible clayey soil due to its poor bearing capacity. Effect of soilfiber reinforcement on soil shear strength.
Moreover, a higher soil dry density showed a more positive effect in mobilizing the reinforcement benefit of fibers. Pdf desiccation cracking behavior of polypropylene fiber. Skin skin is the facing element of the reinforced soil wall. Once the soil freezes most of its properties including.
Microbially induced carbonate precipitation micp has been found promisingly to improve soil mass properties with the environmentally friendly biogeochemical process, while micptreated soils show brittleness. Pmcs with discontinuous fibers less than 100 mm long. Fiber reinforced concrete types, properties and advantages. In this paper, randomly distributedreinforced soil is discussed. The soil must have a moisture content suitable for compaction.
Afterward, shear behavior of both fiber and loopformed fiberreinforced soil composite samples was modeled by using forceequilibrium method and slippage theory of short fiber composites. Figure 2 and 3 compare the direct shear test results of unreinforced and reinforced soil with different percentage of. Polymer matrix composites pmcs consist of a polymer resin reinforced with fibers, an example of which is the combat helmet. Experimental study of cement stabilized fiber reinforced compressed earth blocks as an alternative building material by rakshith padmini chikke gowda a thesis presented in partial fulfillment of the requirements for the degree master of science approved november 2016 by the graduate supervisory committee claudia zapata, chair edward kavazanjian. Of course, some of researchers have studied and appreciably contributed within the. Stabilization of black cotton soil using fly ash and nylon. The standard fiberreinforced soil is defined as a soil mass that contains randomly distributed, discrete elements fibers that provide an improvement in the. Reinforced soil imagine turf that is so tough and resilient, you can park a fire engine on it after a hard rain and drive it off without scarring the surface.
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