EFFECT OF RECYCLED COARSE AGGREGATES ON STRENGTH AND DURABILITY OF CONCRETE BY USING VARIOUS CHEMICAL TREATMENT METHODS

CIVIL ENGINEERING

India’s official recycling capacity of construction and demolition (C&DW) waste is a meagre 6,500 tonne per day. C&DW is just around 1% according to analysis by the Centre for Science and Environment (CSE). The country’s total construction and demolished waste is estimated to be 150 million tonne, according to the Building Material Promotion Council (BMPTC), India. Recycling of aggregate is a key step for construction material. However, recycled aggregate has poor quality as compared to natural and fresh aggregate, we can use recycled aggregate by some treatment of improvement to strengthen and durability approach for recycled concrete aggregate (RCA). For improving the quality of recycled coarse aggregate, various surface treatment methods such as removing the attached mortar by ultrasonic cleaning method, ball milling, heating, and then rubbing or pre soaking RCAs with HCl, H2SO4, and Na2So4, improving the quality of attached paste, such as surface coating with water glass pozzolanic materials, polyvinyl alcohol emulsion (PVA), silicone based emulsion, silica fume or silica gel, coating of cement, carbonation (CO2) curing treatment methods. However, the addition of acidic solvents can lead to new pollution, use of water glass increases the risk of alkali aggregate reaction, and the other methods require extra energy thus carbonation process is more adequate to be used. Strength properties of the treated and untreated coarse aggregate were compared. The results indicated that the compressive, flexure and split tensile strength of recycle aggregate is found to be less than the natural aggregate and treated recycle aggregate is found to be nearest or more than the natural aggregate.

This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.