Climatic conditions such as ambient temperature, wind speed and relative humidity can significantly affect water loss at the concrete surface. In addition to making finishing more difficult, a surface that dries too rapidly increases shrinkage and the risk of cracking. The chemical hydration reaction of the cement requires a sufficient amount of water as well as appropriate temperature conditions to allow the concrete to achieve the specified strength and durability.

Ontario Redimix has developed a Concrete Evaporation Calculator to estimate the evaporation rate of concrete under current climatic conditions and recommends mitigation or protection measures to be put in place to ensure the quality of your concrete pour. Generally, when the evaporation rate exceeds 0.5kg/m²/hour, mitigation measures should be considered.

As a partner committed to your success, in addition to providing concrete to carry out your work and deliver on your projects, Ontario Redimix offers you products and value-added solutions that can help you contend with any challenge, including restrictive climatic conditions. Contact us if you need additional advice for your concrete work.