Deflection Properties of Pavement Constructed on Subgrade Containing Crushed Oyster Shell

Yamada, Mikio; Taniguchi, Katsuya; Okumura, Mitsushi; Sano, Hiroaki

doi:10.2472/jsms.53.25

Cited by 3 publications

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“…The general findings reveal that seashells can be used as an aggregate replacement, but the salt content and chloride ion presence in seashells can be harmful to concrete or asphalt mixes. Some others researchers have explored its uses in pavement subgrade stabilization of clayed or compressive soils [22][23][24][25]. The results show that crushed shell can be effectively utilized as a subgrade improvement, reducing plasticity and increasing the bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

Use of crushed seashell by-products for sandy subgrade stabilization for pavement purpose

Ruiz

Farfán²

2016

Proceedings of the 14th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Engineering Innovati

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This research aims to explore an alternative utilization of seashell wastes in sandy subgrade stabilization in order to reduce environmental pollution. Crushed Peruvian Scallop was mixed with silty sand subgrade through mechanical stabilization at 20%, 40%, 60%, and 80% soil subgrade replacement. Seashells were simply washed and sun-dried before being crushed. Evaluation of the crushed seashell (CSS) reveals that it can be considered as a gravel material, with flat but not elongated particles of 25% of Los Angeles Abrasion loss value. Laboratory testing and analysis determined that it meets the American Association of State Highway and Transportation Officials' (AASHTO) requirements for use as a subbase and base coarse material at 45% replacement of fine soil aggregate. The CSS addition in sandy soil increases the maximum density using less water than the control group, with the same compaction energy. The CSS addition also increases the California Bearing Ratio (CBR) of sandy soil from 51% to more than 100%. It can be concluded that crushed waste Peruvian Scallop has the potential to perform as a mechanical soil stabilizer, or for soil modification for pavement applications, simply using washing and sun-drying treatment.

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Section: Introductionmentioning

confidence: 99%

Use of crushed seashell by-products for sandy subgrade stabilization for pavement purpose

Ruiz

Farfán²

2016

Proceedings of the 14th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Engineering Innovati

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Removal of hydrogen sulfide using crushed oyster shell from pore water to remediate organically enriched coastal marine sediments

Asaoka

Yamamoto

Kondo

et al. 2009

Bioresource Technology

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Hydrogen sulfide is highly toxic and fatal to benthic organisms as well as causing depletion of dissolved oxygen and generating blue tide in eutrophic coastal seas. The purposes of this study are to reveal adsorption characteristics of hydrogen sulfide onto crushed oyster shell, and to evaluate removal efficiency of hydrogen sulfide from pore water in organically enriched sediments using container experiment in order to develop a coastal sediment amendment. The crushed oyster shell was mainly composed of CaCO(3) with calcite and CaO crystal phase. The batch experiment showed removal kinetics of hydrogen sulfide can be expressed as the first order equation and Langmuir plot fitted well in describing the adsorption behavior with the adsorption maximum at 12 mg-S g(-1). The container experiments suggested the oyster shell adsorbs hydrogen sulfide in pore water effectively and reduces oxygen consumption in the overlying water. Furthermore, oxidation-reduction potential of the sediment was higher with addition of crushed oyster shell than the control without oyster shell. Thus, it is concluded that crushed oyster shell can be an effective amendment to remediate organically enriched sediments in eutrophic coastal seas.

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A Study on Stabilization Effect of the Acid Sulfate Soil by Using Crushed Oyster Shell

Yamada¹,

Tatsuno²,

Sano³

et al. 2005

J. Soc. Mat. Sci., Japan

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Excavating the ground which consists of the marine deposits formed during Neogen and/or Quaternary period, the acid sulfate soil occasionally appears on the execution basis. As this soil includes sulfuric acid produced with the oxidation of sulfide, the growth of plants is disturbed and it becomes difficult to improve the soil by adding a stabilizer. In general, the calcic materials such as stone powder and zeolite have been employed to neutralize the acid sulfate soil from the past. Therefore, the shells which are composed mainly of a calcium carbonate can also be considered to be useful as a material for the neutralization process. We have ascertained the stabilization effect due to the using of crushed oyster shell by comparing the amount of swelling and CBR value for soil-stabilizer-shell mixture with those for soil-stabilizer mixture. Mixing crushed oyster shell into the soil, pH value of the mixture gradually shifted to neutral with elapsed time and its water content decreased immediately. Furthermore, the amount of swelling which occurred during submergence curing was extremely small for soil-stabilizer-shell mixture and CBR value of this mixture was 1.5 to 4 times larger than that of soil-stabilizer mixture. These results indicate that both surplus soil and non-industrial waste will be utilized effectively as embankment and subgrade materials at a time.

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Deflection Properties of Pavement Constructed on Subgrade Containing Crushed Oyster Shell

Cited by 3 publications

References 0 publications

Use of crushed seashell by-products for sandy subgrade stabilization for pavement purpose

Use of crushed seashell by-products for sandy subgrade stabilization for pavement purpose

Removal of hydrogen sulfide using crushed oyster shell from pore water to remediate organically enriched coastal marine sediments

A Study on Stabilization Effect of the Acid Sulfate Soil by Using Crushed Oyster Shell

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