Mechanical Properties, Failure Mode, and Microstructure of Soil-Cement Modified with Fly Ash and Polypropylene Fiber

Duan, Xuelei; Zhang, Jingshuang

doi:10.1155/2019/9561794

Cited by 21 publications

(16 citation statements)

References 25 publications

(33 reference statements)

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“…Here, the distribution of crack is prevented by the union of soillime and fibres which link across the cracks [20]. The inclusion of lime plays a significant role in improving the bond strength between the pineapple leaf fibre and soil [22].…”

Section: Discussionmentioning

confidence: 99%

“…The addition of lime also plays a significant role in the bond strength development of the composites and sealing the pores. Constituents such as silica, calcium oxide and alumina produce a gel that interlinks with the soil particles and seal the pores to achieve enhanced strength [22].…”

Section: 1effect Of Fibre and Lime Content On The Compressive Strengthmentioning

confidence: 99%

“…On further addition of pineapple fibre the flexural strength gradually reduces due to the overlay of fibres each other which result in poor cohesion with the soil ensuing in the weakening strength of the composites [21]. Duan and Zhang [22] reported that there is a delay in the extension of crack due to the linking of the soil matrix by the fibres. In addition, the tensile failure of the specimen is more gradual with the increased fibres content with soil lime matrix and hence more ductile behaviour is also reported in earlier studies [24].…”

Section: 1effect Of Fibre and Lime Content On The Compressive Strengthmentioning

confidence: 99%

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An engineered alternative brick masonry unit for the poor inhabitants at hawassa village, Ethiopia

Daniel¹,

Basora²,

Gebrie³

2021

IJATEE

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The traditional house construction pattern in the southern rural regions of Ethiopia is preferably constructed by means of "Chika-pet", which is the mud and wood construction technique, due to the poverty and low annual income of the inhabitants. "Chika" is a composite mixture of clay, teff straw and water, that is used as a gap filling material between the wooden frames and finally as a plaster. Due to the climatic uncertainties, this mud wall construction pattern experiences severe shortcomings such as wide crack formation in the walls, shrinkage, strength weakening, and prone to be eroded by rain which deteriorates the durability.*Author for correspondence Later on, to cope with these drawbacks the animal dung is used as a protective coating on the Chika-pet house walls. It further requires frequent maintenance and cost wise unaffordable by the inhabitants. Moreover, these houses require plenty of woods for the construction of walls and roofs which increases the cost and deforestation rate, hence these mud walls using soil is considered to be defective.Recently, the advancement of house construction in the southern regions of Ethiopia is upgraded by using bricks as the construction material. In current practice, the brick masonry units are made of a composition of soil and teff straw fibre, wherein the s oil is preferably collected from the far distance regions like Ziway, Alemtena and Meki. The negligence of their native southern region soil is due to its poor brick construction characteristics and hence this complicates Re search Article

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Section: Discussionmentioning

confidence: 99%

Section: 1effect Of Fibre and Lime Content On The Compressive Strengthmentioning

confidence: 99%

Section: 1effect Of Fibre and Lime Content On The Compressive Strengthmentioning

confidence: 99%

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An engineered alternative brick masonry unit for the poor inhabitants at hawassa village, Ethiopia

Daniel¹,

Basora²,

Gebrie³

2021

IJATEE

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“…The results showed that the dynamic strength and dynamic elastic modulus of fibrous hydroclay were influenced by the surrounding pressure, fiber type, and fiber admixture; the dynamic strength and maximum dynamic elastic modulus of fiber content increased while the dynamic deformation decreased when the fiber content increased; the greater the surrounding pressure, the greater the maximum dynamic elastic modulus of fiber cement–soil. In order to study the influence of FA and polypropylene fiber on the mechanical properties, failure mode, and microstructure of cement–soil, Duan et al [ 23 ] added 0%, 0.1%, 0.2%, 0.3%, and 0.4% of PP fiber and 0, 4, 8, and 12% of FA to cement–soil, and carried out the UCS test, split tensile strength test, and SEM test. Arıcı et al [ 24 ] employed corn cob ash to modify polypropylene fiber-reinforced cement mortars, and they reported that a cement dosage of 22%, corn cob ash of 9%, and polypropylene fiber of 7% were effective via analysis of variance.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties, Curing Mechanism, and Microscopic Experimental Study of Polypropylene Fiber Coordinated Fly Ash Modified Cement–Silty Soil

Lu¹,

Ma²,

et al. 2021

Materials

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Silty soil has the characteristics of low natural moisture content and poor viscosity, and the strength and deformation required for foundation engineering can be satisfied by reinforcing and improving the silt. In order to study the reinforcement and improvement effects of polypropylene (PP) fiber and fly ash (FA) on cement–silty soil, an unconfined compressive strength (UCS) test, scanning electron microscope (SEM) test, and X-ray diffraction (XRD) analysis test were carried out. Cement (mixed amounts are 4%, 8%, 12%, and 16% of dry soil mass) was used as the basic modifier, and PP fiber (mixed amounts are 0%, 0.15%, 0.3%, and 0.45% of dry soil mass) compounded with FA (adding amounts of 0%, 5%, 10%, and 15% of dry soil mass) were used as an external admixture of cement–silty soil to study the mechanical properties, curing mechanism, and microstructure of the modified soil in different ages of 7 d, 14 d, 28 d, and 60 d. The test results show that with the increase in cement and curing age, the UCS of the modified soil increases, and with the increase in the PP fiber and FA, the UCS of the modified soil first increases and then decreases; there is an optimal content of FA and PP fiber, which are 10 and 0.15%, respectively. A large amount of C-S-H and AFt substances are produced inside the modified soil to cover the surface of soil particles or fill in the pores between soil particles, forming a tight spatial network structure and improving the mechanical properties of the cement–soil. The intensity of the diffraction peaks of the mineral components within the modified soils is more influenced by the cement and age, and the effect of FA is weaker. The stress–strain curve of the modified soil is divided into elastic stage, plastic deformation stage, and strain-softening stage, and the specimens in each stage have corresponding deformation characteristics. By analyzing the behavioral characteristics and curing improvement mechanism of modified soil from the duo perspective of macro-mechanical properties and microstructural composition, it can provide some basis for the engineering application of silty soil.

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“…e soil-cement is a kind of compound material which is mainly mixed by soil, cement, water, and additive upon certain proportion [1]. Such soil-cement has been widely used in engineering due to unique features [2,3], such as flexibility, commercial availability, and low permeability, and achieved remarkable results.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ferronickel Slag Powder on Strength of Soil in Marine Environment

Chen

Tong

2020

Advances in Civil Engineering

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Over the past few years, soil-cement has been widely used in marine geotechnical engineering; meanwhile, the safety of soil-cement in marine environment has attracted wide attention. In order to study the influence of composite ferronickel slag powder on the strength and micro morphology of soil-cement in marine environment, the composite nickel iron slag powder was added into the soil-cement in this paper. The unconfined compressive strength test, erosion resistance coefficient analysis, SEM, and EDS test analysis of soil-cement were carried out.. Results showed that the marine environment had great influences on the strength of soil-cement, and the addition of compound nickel-iron slag powder can enhance the strength of soil-cement, and the deterioration of the strength of soil-cement is reduced. In addition, the compound ferronickel slag powder has microaggregate effect, morphological effect, and activation effect, which not only improves compaction rate of soil-cement and prevents invasion of erosive ions in marine environment but also has positive effects on the performance of soil-cement.

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Mechanical Properties, Failure Mode, and Microstructure of Soil-Cement Modified with Fly Ash and Polypropylene Fiber

Cited by 21 publications

References 25 publications

An engineered alternative brick masonry unit for the poor inhabitants at hawassa village, Ethiopia

An engineered alternative brick masonry unit for the poor inhabitants at hawassa village, Ethiopia

Mechanical Properties, Curing Mechanism, and Microscopic Experimental Study of Polypropylene Fiber Coordinated Fly Ash Modified Cement–Silty Soil

Effect of Ferronickel Slag Powder on Strength of Soil in Marine Environment

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