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Physical Characterization of Batie and Bandjoun-Djione Sands(West-Cameroon),Used in the Manufacture of Concrete:Improvement of Resistance to Compression

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Journal of Materials Science and Chemical Engineering 2020年第5期8卷 10-20页

作者： Jules H.Keyangue Tchouata Casimir Gouafo Grégoire Kamdjo francois ngapgue Armand S.L.Wouatong School of Geology and Mining Engineering University of NgaoundereNgaoundereCameroon Fotso Victor Institute of Technology University of DschangDschangCameroon Faculty of Sciences University of DschangDschangCameroon

The objective of this work, was to characterize the sands of the quarries of: Bandjoun-Djione, Djengou, Hiala and La’gou I, mainly from their mechanical strengths, the equivalent of sand and the finesse module. In order to study the compressive strength of concrete made from these sands, we determined their granularity, fineness modulus and density;the concrete was then formulated by the Dreux-Gorisse method. A total of 72 specimens were constructed with the objective of achieving an average compressive strength of 25 MPa at 28 days. But we have obtained a compressive strength at 28 days, varying from 13.14 MPa to 17.50 MPa. The correction of the modulus of fineness of these sands made it possible to improve the granularity and increase the compressive strength of these concretes by more than 70%. We have thus obtained the compression resistance of 25 MPa aimed for each of the corrected sands.

关键词： Sand Granulometry Concrete Mechanical Resistance Djengou Hiala La’gou I Bandjoun-Djione

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Concrete Based on Recycled Aggregates for Their Use in Construction: Case of Goma (DRC)

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Open Journal of Civil Engineering 2020年第3期10卷 226-238页

作者： Masika Muhiwa Grâce Alinabiwe Nyamuhanga Ally Muhindo Wa Muhindo Abdias Kubuya Binwa Patient Muhatikani Trésor Manjia Marcelline Blanche ngapgue francois Department of Civil Engineering Faculty of Applied Sciences and Technologies UniversitéLibre des Pays des GrandsLacs Goma Democratic Republic of Congo Buildings and Publics Works Section Institut du Batiment et des Travaux Publics Butembo Democratic Republic of Congo Department of Civil Engineering National Advanced School of Engineering University of Yaoundé 1 Yaoundé Cameroon Department of Civil Engineering Fotso Victor University Institute of Technology University of Dschang Bandjoun Cameroon

The following study is aimed at valorizing an important part of waste from building demolition, particularly concrete as a source of aggregates for their usage in new hydraulic concrete formulation. The experimental study mainly consisted of physical characterization of natural and recycled aggregates respectively and the impact of the latter on some properties of the new formulated concrete, actually their respective consistencies for fresh concrete and mechanical strength for the hardened one. The outcome of the study shows that the recycled aggregates are more heterogeneous and have a high capacity of water absorption, but which still respects the current standards of concrete. The need for additional water has been observed for recycled aggregates-based concrete so as to have the same workability. About the compressive strength, mechanical properties obviously show that, at 28 days from setting up, concretes from recycled aggregates can reach compressive strengths range between 20 and 25 MPa without any sophisticated technology. So, these results show that we can efficiently contribute to the protection of environment by valorizing waste from concrete-based building demolition on the one hand;and the preservation of natural reserve on the other. And both advantages contribute to sustainable development overall goals.

关键词： Demolition Recycling Water Absorption Concrete Mechanic Resistance

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