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@dik thanks We can do a different mix with GGBFS but it will take time for testing, approvals and rafts are ready to pour. so we dont have time for a new mix approval. Flyash increase will not help in achieving below 70 Deg C because of high strength mix, and large depths (3.5meters avg). Max...

@SlideRuleEra thanks Flyash Type F is used. Microsilica was used for below reasons, 1. durability requirements in terms of RCP, water permeability 2. ACI 201.2R16 specifies microsilica (min 5%) to be used in combination with flyash(min 25%). The table is attached in my posts. 3. strengths are...

ACI 301 Section 8 on "Mass Concrete" specifies 70 Deg C peak core temperature and differential temp as 20 Deg C without specifying if the mix contains pozzolans or no. It could be talking about 100% portland cement mix that is more susceptible to thermal reactions and higher evolution of heat...

ACI 201.2R-16 attached for your ready referencehttps://files.engineering.com/getfile.aspx?folder=64c24238-3140-4cbe-b089-be36f428d7a0&file=Screenshot_2023-04-11_143159.png

DEAR Concrete Experts, Mass concrete pours are planned with C60 CYLINDER strength mix with 30% Flyash and 7% microsilica. The specs calls for ACI 301 limits on temperatures (70 Deg C max peak internal temp & 20 Deg C differential). A mock up cube 2mx2mx2m was casted during winter season and...