Results 141 to 150 of about 513 (164)
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An investigation of periwinkle shells as coarse aggregate in concrete
Building and Environment, 1995Abstract An Investigation into using periwinkle shells (PWS) partially or wholly in concrete is reported. Three standard mixes of cement: sand: granite + PWS (1: 1 1 2 :3, 1:2:4 and 1:3:6) and two design mixes of cement: sand: PWS (1: 3 1 2 :1 and 1: 4 1 2 : 1 case1 2 ) were used.
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A geographically-based study of shell shape in small rough periwinkles
Hydrobiologia, 1995A study using principal component analysis and discriminant analysis was carried out on shell shape variation in 3093 specimens of rough periwinkles, 2500 of which were below 5.5 mm in columella length, from around the North Atlantic. Using a combination of colour plus sculpture, and life history trait, the snails were classified by inspection and ...
K. J. Caley, J. Grahame, Peter J. Mill
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The suitability of periwinkle shells as coarse aggregate for structural concrete
Matériaux et Constructions, 1974The results of an exploratory investigation on the suitability of periwinkle shells as coarse aggregate for concrete are reported. The tests show that the strength of concrete made with periwinkle shells are limited by the strength of the shells but high enough for structural concrete.
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Strength Characteristics of Periwinkle Shell Ash Blended Cement Concrete
International Journal of Architecture, Engineering and Construction, 2012The study investigated the eect of periwinkle shell ash (PSA) as cement substitute on the strengths of concrete. Specimens were prepared from a mix of designed strength 25N=mm 2 and the replacement of cement with PSA was from 0% up to 40%. A total of 180 specimens were cast and tested for compressive and tensile splitting strength at 7 and up to 180 ...
Kolapo O. Olusola, Akaninyene A. Umoh
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Stimulated Biodegradation of Crude Oil in Soil Amended with Periwinkle Shells
Environmentalist, 2003The potential of periwinkle shell (PS) in enhancing the microbial break down of crude oil spilled in soil were studied. The results revealed that the counts of crude oil degrading bacteria in oil-polluted soil fortified with PS were higher than the counts in unfortified soil.
U.J.J. Ijah, M. Ndana
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Effect of periwinkle shell on the physical and mechanical properties of sandcrete block
Nigerian Journal of Technological Research, 2022Periwinkle shells are waste products derived from Periwinkles. They can be recycled and processed either as fine aggregate, coarse aggregate, filler, or cement replacement. This study investigates crushed periwinkle shells' suitability as an alternate material for natural sand in sandcrete hollow blocks for sustainable infrastructure.
Davies, Iyinoluwa E. E. +1 more
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Environmental Science and Pollution Research
Periwinkle and coconut shells are becoming increasingly popular as dielectric materials with thermal insulation properties. Natural sources of synthesis could provide a cheaper and more ecologically friendly alternative to chemically synthesizing such compounds as thermal insulators or fillers in polymer composites.
Thomas Ojonugwa Daniel
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Periwinkle and coconut shells are becoming increasingly popular as dielectric materials with thermal insulation properties. Natural sources of synthesis could provide a cheaper and more ecologically friendly alternative to chemically synthesizing such compounds as thermal insulators or fillers in polymer composites.
Thomas Ojonugwa Daniel
exaly +3 more sources
Biomaterials from Periwinkle Shells: Composition and Functional Properties
2007The study evaluated the composition and functional properties of chitosan from the shells of two species of periwinkle L. punctata and N. natalensis. The chitosan samples from both species had a moisture content of 7–8%, ash 86–87% and crude fibre of 4%.
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Production of concrete using laterite, periwinkle shell and river stone
International Journal of Natural and Applied Sciences, 2013This paper presents the success recorded in producing concrete using laterite, periwinkle shell and river stone. Laterite was used to replace 100% of sand. Periwinkle shell replaces 50% by volume of the total coarse aggregate, while river stone made up the rest 50%.
Ibearugbulem, OM, Ettu, LO, Ezeh, JC
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Shell Growth in the Periwinkle, Littorina litorea
The American Naturalist, 1932Green, C V, Green, S K
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