International Journal of Natural Sciences Research

Published by: Conscientia Beam
Online ISSN: 2311-4746
Print ISSN: 2311-7435
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No. 4

Efficiency of Plastic Fibres Waste on the Physico-Mechanical Properties of Mortars in Hot-Dry Conditions

Pages: 75-82
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Efficiency of Plastic Fibres Waste on the Physico-Mechanical Properties of Mortars in Hot-Dry Conditions

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DOI: 10.18488/journal.63/2016.4.4/63.4.75.82

Khadra Bendjillali , Mohamed Chemrouk

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Khadra Bendjillali , Mohamed Chemrouk (2016). Efficiency of Plastic Fibres Waste on the Physico-Mechanical Properties of Mortars in Hot-Dry Conditions. International Journal of Natural Sciences Research, 4(4): 75-82. DOI: 10.18488/journal.63/2016.4.4/63.4.75.82
This experimental study was aimed at evaluating the effect of plastic fibres waste on the physical and mechanical performances of mortars prepared and conserved under hot-dry conditions. The used fibres are recycled polypropylene fibres coming from industrial waste. Two dosages of fibres are used 0.5 and 1 % by weight. The results showed that the exposition of mortars to hot-dry conditions reduces their long-term mechanical strength and increases their shrinkage. Under hot-dry conditions, the reinforcement of mortars by plastic fibres waste has a positive effect on their flexural and compressive strength. The shrinkage of mortars conserved under these conditions is reduced by the addition of plastic fibres waste.
Contribution/ Originality
This study contributes to enrich the fibres mortars researches. For technico-economical and environmental interests, we used local materials coming from natural and industrial waste, such as the sand and fibres. It is one of very few studies which have investigated the effect of hot-dry conditions on the properties of mortars.

Multi-User Searchable Encryption Scheme with User Revocation

Pages: 68-74
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Multi-User Searchable Encryption Scheme with User Revocation

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Microsoft Academic Search
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DOI: 10.18488/journal.63/2016.4.4/63.4.68.74

Chia-Chi Wu , Iuon-Chang Lin , Ya-Hui Liu

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Chia-Chi Wu , Iuon-Chang Lin , Ya-Hui Liu (2016). Multi-User Searchable Encryption Scheme with User Revocation. International Journal of Natural Sciences Research, 4(4): 68-74. DOI: 10.18488/journal.63/2016.4.4/63.4.68.74
We improve the previous method to add the function of user revocation in searchable encryption scheme. When document owner doesn’t want to share someone he had shared, he can revoke the user who can’t retrieve the specific document. More importantly, the revocation process must not affect other authorized users, the scheme has to keep a low maintenance cost.
Contribution/ Originality
This study contributes in the existing literature are to provide a searchable keyword encryption scheme and the document owner can dynamically authorize a user to retrieve documents or revoke the authorization. The maintenance cost of the revocation process is low.