Abstract
The aim of this paper is to study experimentally the effect of marble powder and green sand as partial substitute for fine aggregate on the strength and durability of M40 grade concrete. The use of metakaolin as a pozzolanic admixture by using as binder replacement is also studied to assess the properties with respect to fresh and hardened state. Several formulations were prepared with constant water-binder ratio 0.4 and varying percentages of marble powder and green sand. The results indicated that the properties of concrete were much enhanced by extent incorporation of marble powder and green sand as fine aggregate and metakaolin for cement when compared to normal concrete. The microscopic studies also confirmed the viability of using green sand and marble powder as fine aggregates.
Highlights
Recent decades have witnessed the rapid demand for river sand as fine aggregate which is one of the most essential ingredients in the production of concrete [1]
The workability was considerably decreased for all the mixes with metakaolin as cement replacement and marble and green sand as fine aggregate replacement
The concrete mixes suffered from variations in workability due to the grading and shape of the fine aggregates and the characteristics of the materials used as fine aggregate
Summary
Recent decades have witnessed the rapid demand for river sand as fine aggregate which is one of the most essential ingredients in the production of concrete [1]. Sustainable construction requires the use of supplementary cementitious materials in the concrete as well as minimize the demand of river sand in concrete [3,4]. Supplementary cementitious materials are an integral part of the concrete system to produce high strength concrete with improved durability [7,8]. Apart from the economic benefits the technical importance lies in the performance improvement of concrete when the by-products and wastes are used as concrete ingredients [14]. Marble powder as fine aggregate replacement provided several benefits in terms of strength enhancement as well as positive cost efficiency ratio [15].
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