Fresh Concrete Temperature (ACI 305.1)
The batch temperature concrete-evaporation-rate takes as a given, from the ACI 305.1 ingredient heat balance: T = [0.22(Ta Wa + Tc Wc) + Tw Ww + Twa Wwa] / [0.22(Wa + Wc) + Ww + Wwa], solids weighted by their ~0.22 specific heat and water by 1.0. Aggregate 3000 lb at 80 F, cement 564 lb at 150 F, 240 lb of 70 F water, and 60 lb of aggregate moisture batch to 85.8 F. Water's heat capacity is four times the solids', so chilling the mix water or adding ice is the cheapest way to beat the ~90 F hot-weather ceiling. A batching aid; the mix design governs.
Formula and source
T = [0.22(Ta x Wa + Tc x Wc) + Tw x Ww + Ta x Wwa] / [0.22(Wa + Wc) + Ww + Wwa]; solids specific heat 0.22 Btu/lb-F, water 1.0, aggregate free moisture at the aggregate temperature.
ACI 305.1 Specification for Hot Weather Concreting (the batch heat-balance for fresh concrete temperature); PCA Design and Control of Concrete Mixtures, by name; the mix design and project specification govern.
Audience
This tile is built for trades and the adjacent professions in the Carpentry and Construction group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
Related tools
Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.