Abstract
Soil reinforcement is an old and still efficient technique in improving soil strength and stiffness properties. Current paper aims at quantifying the effects of different inclusions on mechanical behavior of fiber-reinforced cemented soil. An experimental program was conducted to study simultaneous effects of randomly oriented fiber inclusions and cement stabilization on the geotechnical characteristics of fly ash-soil mixtures. Chamkhaleh sand, polyvinyl alcohol (PVA) fiber, cement and fly ash with some water were mixed and compacted into large scale direct shear apparatus with three equal layers. PVA fibers were randomly distributed in three compacted layers at predetermined weight contents. Direct shear tests were carried out on fly ash-soil specimens prepared with different cement, fly ash and polyvinyl alcohol contents, and 7 different curing periods. Results show that cement increases the strength of the raw fly ash-soil specimens. The fiber inclusion further increases the strength of the cemented and uncemented soil specimens and transforms their brittle behavior to ductile behavior. The fiber reinforcement and distribution throughout the entire specimen results in a significant increase in the strength of fly ash -soil- cement mixtures.
Highlights
Construction of buildings and other civil engineering structures on weak or soft soils can be highly risky because such types of soils are susceptible to differential settlements due to their poor shear strength and high compressibility
The current study aims at investigating geotechnical characteristics of fly ash-soil specimens, cement-soil specimens, and cement-fly ash-soil specimens mixed with different proportions of randomly oriented polyvinyl alcohol (PVA) fibers
An experimental program was undertaken on fly ash-soil-cement specimens of different proportions, to investigate the individual and combined effects of randomly oriented fiber inclusions on the geotechnical characteristics of fly ash-soil-cement-PVA fiber mixtures
Summary
Construction of buildings and other civil engineering structures on weak or soft soils can be highly risky because such types of soils are susceptible to differential settlements due to their poor shear strength and high compressibility. Fiber reinforced soil can be considered to be good ground improvement technique specially in engineering projects on weak soils where it can act as a substitute to deep/raft foundations, reducing the cost as well as energy. Both the length and content of coir have important role in developing the strength properties of stabilized soil. Deshpande and Puranik [31] concluded that the black cotton soil mixed with fly ash and polypropylene fibers can be considered a good ground improvement technique especially in engineering projects on expansive soils where it can act as a substitute to deep/raft foundations, reducing the cost. Results of the experimental study and their corresponding conclusions have been presented
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