If you are looking for superior concrete control the best temperature for the freshly mixed concrete as delivered is between 16° - 26°. However, The typical maximum values of temperature are between 26° and 35° as stated by ASTM C 1064. ACI 305R section 3.2.1 states that “concrete can be produced in hot weather without maximum limits on placing temperature and will perform satisfactorily if proper precautions are observed in proportioning, production, delivery, placing, and curing. As part of these precautions, an effort should be made to keep the concrete temperature as low as practical.”
i think that 23 oC can be ok. u can see the file below
http://www.cement.org/docs/default-source/th-paving-pdfs/soil_cement/rd113-the-influence-of-casting-and-curing-temperature-on-the-properties-of-fresh-and-hardened-concrete.pdf
If you are looking for superior concrete control the best temperature for the freshly mixed concrete as delivered is between 16° - 26°. However, The typical maximum values of temperature are between 26° and 35° as stated by ASTM C 1064. ACI 305R section 3.2.1 states that “concrete can be produced in hot weather without maximum limits on placing temperature and will perform satisfactorily if proper precautions are observed in proportioning, production, delivery, placing, and curing. As part of these precautions, an effort should be made to keep the concrete temperature as low as practical.”
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