Suitability of Flyash-Lime-Phosphogypsum Composite in Road Pavements

Dutta, Rakesh Kumar; Kumar, V. Giridhar

doi:10.3311/ppci.7800

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…Three studies stood out in particular due to the similarities in the composition of the blend investigated. These investigations were done by Shen et al ( 2007 ), Dutta and Kumar ( 2016 ) and Mashifana et al ( 2018 ). The former two considered the LFP combination for use as a road base material, whereas the latter considered the combination for stabilizing expansive soils to be used as a road base.…”

Section: Resultsmentioning

confidence: 99%

“…Although the test was originally proposed for determining the lime proportion required for modifying soil properties, this was extended to the solid wastes in the present study. In earlier studies, involving lime–FA–PG (LFP) combinations, the lime required for activation was determined based on strength tests (Shen et al 2007 ) or compaction tests (Dutta and Kumar 2016 ). Following the determination of ICL values for the three trial mixes, the FA–PG blends were mixed with lime as determined from the pH tests to prepare a binder paste.…”

Section: Methodsmentioning

confidence: 99%

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Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

James¹,

Arthi²,

Balaji³

et al. 2021

Int. J. Environ. Sci. Technol.

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This study investigates the potential of a blended binder formulated from two industrial solid wastes viz. phosphogypsum and fly ash in combination with lime. Three mix proportions of phosphogypsum and fly ash were investigated, and the minimum lime contents required for activation were determined using the Eades and Grim pH test. The lime–fly ash–phosphogypsum blends were then cast into cubes, both in their paste form as well as mortar form, mixed with sand in the ratio of 1:3. They were cured for a period of seven days, and afterwards, their compressive strength was determined. Ordinary Portland cement and lime mortar blocks were also cast as control specimens for comparative evaluation of the strength. The optimal lime–fly ash–phosphogypsum blend was identified and used to construct a masonry prism, and the strengths of the masonry prisms were also evaluated. The optimal lime–fly ash–phosphogypsum blend mortar was also subjected to an X-ray diffraction analysis to determine the reaction products formed during hydration. The study revealed that 5% lime mixed with fly ash:phosphogypsum in the ratio of 3:1 was the optimal proportion which gave the maximum strength to the cubes. The optimal lime–fly ash–phosphogypsum blend mortar developed strength that was higher than conventional Portland cement and lime mortar. The optimal lime–fly ash–phosphogypsum blend mortar masonry prisms developed strength that was comparable to that of Portland cement mortar masonry. The X-ray diffraction analysis revealed the formation of calcium silicate hydrate minerals as well as ettringite and portlandite which were responsible for strength gain.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

James¹,

Arthi²,

Balaji³

et al. 2021

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

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“…In India, tests were conducted on mixtures of PG, lime and Fly ash to be used in road base and sub base construction; therefore, the characteristics of raw materials and formed mixtures were determined. However, mixture consisting 2%PG, 8% lime plus 90% fly ash satisfies the requirement of road base and sub base construction, where results showed an increasing in UCS, split tensile strength and CBR with curing age [17].…”

Section: Introductionmentioning

confidence: 94%

Improving of Base Course Materials Characteristics using Industrial Wastes

Almallouhi*,

Mahdy,

Kandil

2019

IJEAT

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Phosphogypsum is a solid by-product waste generated from phosphoric acid industry. This paper presents the effectiveness of mixing Phosphogypsum with crushed limestone to use this blend as road base course. Seven percentages (0,5,10,15, 20, 25 and 30%) of Phosphogypsum were replaced from crushed limestone mixture dry weight. The influence of blending Phosphogypsum with crushed limestone was evaluated by preparing and testing mixture with several percentages of phosphogypsum and crushed limestone to determine some of their properties as maximum dry density, optimum moisture content, un-soaked California bearing ratio, soaked California bearing ratio, swelling percent and California bearing ratio after a series of wetting-drying cycles. The results indicate that the mechanical characteristics were improved by adding phosphogypsum to the crushed limestone mixtures.

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“…So, the quantity and quality of the abovesaid minerals may also be check, if the electrical resistivity is a prime concern at mineral rich site. The sulphate ions react with available alumina and helps to create a dense hydrate structure to promote the strength in soil [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Eggshell and Natural Chloride Stabilized Soil Using Geophysical Techniques

Kumar

Soni

2021

IJIE

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Although many techniques are available for the evaluation of soil parameters, but a quick and efficient method is always welcome. To avoid the hassle calculation and tedious procedures of testing; practitioners seek a fast method for site implementation of laboratory results. In the recent era of development and technology, it has been necessary to adopt the advanced techniques to evaluate the geotechnical parameters. In the present study, correlations between geophysical and compaction tests results have been derived. Eggshell powder (ESP), a waste material along with sodium chloride (NaCl) and polypropylene fiber (PPF) was used to stabilize the soil. Design of experiments was done by Taguchi technique using Minitab 17 software. A series of non-destructive geophysical tests i.e., Ultrasonic pulse velocity (UPV) and Electrical resistivity (Re) tests was carried out on 21 days aged soil specimens. Not only software based analytical results showed ESP as the dominating factor for attaining improvement in packing of soil particles and make soil resistive but also the results confirmed the same. UPV of the stabilized soil was found increased up to 69%-122% with respect to an increase in dry density of about 1.16%-1.74%. The utility of the present study can be found in places where dense soil and electric resistive properties meets such as transmission lines and railway electric poles etc. and for the purpose seismic and resistivity mapping methods can be used

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Suitability of Flyash-Lime-Phosphogypsum Composite in Road Pavements

Abstract: Abstract

Cited by 23 publications

References 21 publications

Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

Lime activated flyash-phosphogypsum blend as a low-cost alternative binder

Improving of Base Course Materials Characteristics using Industrial Wastes

Characterization of Eggshell and Natural Chloride Stabilized Soil Using Geophysical Techniques

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