Abstract
The quality of a concrete parking lots, floors or slabs is highly dependent on achieving a hard and durable surface that is flat, relatively free of cracks and at the proper grade and elevation. The properties are determined by the aggregate characteristics, cementitious materials and the mixture proportions. Concrete industry is one of the largest consumers of natural resources due to which sustainability of concrete industry is under threat. The environmental and economic concern is the biggest challenge concrete industry is facing. This study addressed, the issues of environmental and economic concern through the use of saw dust ash and egg shell powder mixture as partial replacement of cement in concrete. Hydraulic Cement was replaced by the mixture of Saw Dust Ash and egg shell powder at 5%, 10%, 15%, 20% and 25% by weight. The cylindrical concrete specimens were tested for compressive strength, flexural strength, splitting tensile strength, slump and density .The compressive strength of the specimens was evaluated at the 3rd, 7th, 14th, 28th and 56th days of age. The flexural strength and the splitting tensile strengths were evaluated at 14th and 28 days of age. The results obtained satisfied the minimum specifications of relevant standards and manuals. The study concluded that mixture of saw dust ash and egg shell powder is a suitable supplementary cementitious material and can satisfactorily replace hydraulic cement up to 20% by weight in the construction and maintenance of concrete parking lot placed on the ground. DOI: http://dx.doi.org/10.5755/j01.sace.21.4.19331
Highlights
Hydraulic cement is the most important and most expensive constituent of concrete, the replacement of cement with certain percentage of these saw dust ash and egg shell powder to see their influence on slump, flexural strength and compressive strength at the same time reduces the cost of concrete and reduce the environmental hazard
Crushed granites passing through sieve 31.5mm but retained in sieves 25mm, 18.75mm, 16.0mm, 12.5mm, 9.5mm, 6.25mm and 4.75mm was used as natural coarse aggregate (NCA)
The natural coarse aggregate (NCA) and the fine aggregate were selected in accordance with the specifications of ASTM D 448 – 12 (2012), ACI 201.2R-16 (2016).ACI Education Bulletin E1-07 (2007), and ACI Education Bulletin E1-16 (2016)
Summary
Hydraulic cement is the most important and most expensive constituent of concrete, the replacement of cement with certain percentage of these saw dust ash and egg shell powder to see their influence on slump, flexural strength and compressive strength at the same time reduces the cost of concrete and reduce the environmental hazard. These objectives justify the need for this research
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