Evaluating the Quality of Aggregate from a Doubtful Source for Structural Concrete | Chapter 8 | Recent Progress in Science and Technology Vol. 7

 For the result of structural actual, sedimentary rock aggregates are repeatedly used in Nigeria. It is believed expected one of the causes of many structural bankruptcies in the nation by way of its changeable quality, strength, and contaminations. In this study, the kind of gravels ranging in diameter from 8 to 16 mm from Oji River pits was examined. The substance of concrete from the gravels was optimized utilizing Scheffe's simplex method of addition, and the resultant analytical model provided an ideal compressive substance of 11.78 N/mm2 and a mix percentage of 1:1.4:2.5 for a water/cement ratio of 0.53. Because of the littleness of this optimum substance and the predictions of the model, it was urged that such aggregate (8 - 16mm from Oji- River) be restricted to oversite concretes, processions and lintels of buildings with load posture walls and a maximum storey of three; and it shouldn't always be used for slabs of postponed floors, retaining obstruction, bridges, and culverts.

Author(s) Details:

B .O. Adinna,
Department of Civil Engineering, Nnamdi Azikiwe University, Awka, P.M.B 5025, Nigeria.

C. Chijioke,
Department of Civil Engineering, Federal Polytechnic, Nekede, Owerri, Nigeria.

P. N. Kalu,
Department of Civil Engineering, Federal Polytechnic, Nekede, Owerri, Nigeria.

Please see the link here: https://stm.bookpi.org/RPST-V7/article/view/10032

Evaluating the Quality of Aggregate from a Doubtful Source for Structural Concrete | Chapter 7 | Recent Progress in Science and Technology Vol. 7

 For the result of structural actual, sedimentary rock aggregates are commonly used in Nigeria. It is believed expected one of the causes of many structural declines in the nation by way of its changeable quality, strength, and contaminations. In this study, the character of gravels ranging in magnitude from 8 to 16 mm from Oji River pits was examined. The substance of concrete from the gravels was optimized utilizing Scheffe's simplex method of growth, and the resultant analytical model provided an ideal compressive substance of 11.78 N/mm2 and a mix percentage of 1:1.4:2.5 for a water/cement ratio of 0.53. Because of the littleness of this optimum substance and the predictions of the model, it was urged that such aggregate (8 - 16mm from Oji- River) be restricted to oversite concretes, lines and lintels of buildings with load posture walls and a maximum storey of three; and it shouldn't always be used for slabs of pensile floors, retaining divider, bridges, and culverts.

Author(s) Details:

B .O. Adinna,
Department of Civil Engineering, Nnamdi Azikiwe University, Awka, P.M.B 5025, Nigeria.

C. Chijioke,
Department of Civil Engineering, Federal Polytechnic, Nekede, Owerri, Nigeria.

P. N. Kalu,
Department of Civil Engineering, Federal Polytechnic, Nekede, Owerri, Nigeria.

Please see the link here: https://stm.bookpi.org/RPST-V7/article/view/10032

Application of Mollusc Seashell as Aggregate in Concrete | Chapter 6 | Novel Perspectives of Engineering Research Vol. 3

 Recycling waste materials in cement-based products has been the subject of recent studies on sustainable construction. Large quantities of mollusk seashells are frequently discarded as rubbish along beaches or in landfills, bringing health and environmental problems including as pollution and vector breeding. Mollusc seashell waste is managed by recycling the seashell as a partial or complete replacement for natural aggregate in concrete. Cockle, mussel, oyster, periwinkle, and scallop shells have been utilised as coarse and fine aggregate replacements in concrete. The calcium carbonate content of mollusc seashells is similar to that of limestone-type rocks. Although mollusk seashells contain chlorides, sulphates, and harmful organic materials, their contents can be reduced by washing and boiling. The qualities of mollusc seashell concrete, as well as the treatment, preparation, and features of mollusk seashells, are covered in this chapter. The existing state, limitations, and future potential of mollusk seashell in sustainable concrete building are also discussed. Concrete's workability, density, and strength qualities all diminish as more seashells are replaced. Crushed seashell can be used as a partial fine aggregate in concrete up to 20% without compromising the density or strength of the concrete. As a result, mollusk seashells can be utilised as a secondary aggregate in concrete, especially in areas where large quantities of seashells are available.

Author(S) Details

Uchechi G. Eziefula
Department of Agricultural and Bio-Environmental Engineering Technology, Imo State Polytechnic, Umuagwo, Nigeria.

David O. Onwuka
Department of Civil Engineering, Federal University of Technology, Owerri, Nigeria.

Hyginus E. Opara
Department of Civil Engineering, Imo State University, Owerri, Nigeria.

View Book:- https://stm.bookpi.org/NPER-V3/article/view/4757