• Muskan pathan
• Monali bharne

Concrete is complete composite man-made material, is the most widely used in building material in construction industry. Concrete is a very strong and versatile moldable construction material. It consists of cement, sand and aggregate mixed with water .as the grade of concrete increases . for M20 concrete we can retempered concrete up to 120 min. but for M40 concrete retempering time is only 30 min. the quantity of cement also increase which affects the properties of retempered concrete . usually the retempering process is used with normal retempered concrete with additional retarder . adding water to plastic mix increase the porosity . placement operation can take place from 10 to 60 min. depending upon field condition and load size.

Comparison of two different grade retempered concrete (M40) and medium grade retempered concrete(M20)

"Comparison of two different grade retempered concrete (M40) and medium grade retempered concrete(M20)", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 3, page no.21-25, March-2021, Available :http://www.jetir.org/papers/JETIREN06005.pdf

"Comparison of two different grade retempered concrete (M40) and medium grade retempered concrete(M20)", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 3, page no. pp21-25, March-2021, Available at : http://www.jetir.org/papers/JETIREN06005.pdf