Abstract
Recycling industrial waste materials has become an environmental and economic necessity. The utilization of these materials to develop concrete contributes not only to their disposal, but also to the preservation of the environment. This study attempted to evaluate the properties of sprayed concrete with Marble Dust (MD) as partial replacement of concrete components. For this purpose two series of concrete mixtures were prepared: the first series included six mixtures containing MD as cement replacement with percentages of 5%, 10%, 15%, 20%, 25%, and 30% by weight, the second series included six mixtures containing 5%, 10%, 15%, 20%, 25%, and 30% of MD as replacement for sand. Also, conventional concrete mixture with 100% cement and 100% sand was produced as control mixture. Rheological and mechanical properties as pumpability, build-up thickness, rebound percentage, adhesion strength, and compressive and tensile strength were studied. In general, the results indicate that use of MD improves shotcreting as an application and shotcrete’s performance.
Highlights
Shotcrete, referred to as sprayed concrete or spraycrete, is defined as concrete shooted through a hose at high velocity and pneumatically projected onto a surface [1] or as concrete produced with basic mix and projected pneumatically from nozzle into place to produce a dense homogeneous layer [2]
Studies have shown that the slump of the concrete mixtures is negatively influenced by the Marble Dust (MD) substitution and this effect occurs at greater substitution levels [26]
Concrete mixtures containing MD as cement or sand replacement with percentages from 5% to 30% have slump values lower than the control mixture (0% MD), but still higher than 50mm, which means that these mixtures fulfill the shotcrete requirements reported in [4]
Summary
Referred to as sprayed concrete or spraycrete, is defined as concrete shooted through a hose at high velocity and pneumatically projected onto a surface [1] or as concrete produced with basic mix and projected pneumatically from nozzle into place to produce a dense homogeneous layer [2]. EFNARC defines it as a concrete mix projected pneumatically into a surface to produce a homogeneous and dense mass [3]. Authors in [6, 7] studied the effect of sand replacement with different levels of MD on concrete properties. They observed that the replacement of sand with 15% MD results in compressive strength increment. Authors in [12] studied the effects of sand replacement with 0%, 25%, 50%, 75%, and 100% of MP on the mechanical properties of concrete They reported that substituting sand with 50% MP increased the compressive and flexural strengths by 13.52% and 35.54% respectively
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Engineering, Technology & Applied Science Research
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
