Effect of two stages of mixing water approach on recycled aggregate concrete

Abstract

Construction Waste Management (CWM) is a different task because of it has different characteristics and polluting agents. Nowadays the volume of construction waste is increased day by day. Crushed, graded inorganic particles are Recycled Concrete Aggregates (RCA), and are made from the materials that have been used in construction and demolition.The aim for this project is to determine the strength characteristics of RCA for application in structure concrete, which will give a better understanding on the properties of concrete with RCA, an alternative material to Natural Coarse Aggregate (NCA) in structural concrete. The present experimental study deals with two stages of mixing water approach (TSMWA) for achieving best mechanical properties. The Recycled aggregate was used in five variant as 0 %, 10 %, 20 %, 30 %, 40 % and 50 % replacements of NCA in M20 grade of concrete. In this project, the strength of the concrete was determined and compared by using different percentage of RCA. The investigation was carried out using workability test, compression test, split tensile test and flexure test. Through experimental study and analysis, it is observed that using TSMWA WITH the replacement of 30 % RCA with NCA does not more affect the characteristics of concrete. TSMWA method improve up to 6.35 % the strength of Recycled Aggregate Concrete (RCA) made up of RCA at 28 days respectively w.r.t. Normal Mixing Approach (NMA). It is observed that concrete prepared with TSMWA gives better properties than concrete mixed with NMA.