Effects of Temperature on Concrete and the Installation Process
Temperature is something that we can’t control naturally. Varying temperatures can effect the outcome of new residential or commercial concrete projects and is something to be very mindful of when laying it down. Concrete is initially a plastic material that’s made from a combination of cement, water, and aggregates. Water is something that can become too hot or too cold thus effecting how the concrete appears once it solidifies. This mixture in definite proportions hardens overtime to give the strength that it is designed to have. Even during the process of setting, concrete will release a lot of heat and lose water, which requires being controlled by the process known as curing.
Affects of Temperature on Concrete
Temperatures during the manufacture and placing of concrete can affect on its setting time and final strength. When temperatures are high, this can lead to cracks, and many mass concrete works use chilled water for the mixing process to control the temperature of the concrete and reduce the chances of cracking and damage. Once the concrete has set and gained its design strength, generally accepted as 28 days, the concrete will expand and contract depending on the temperatures in the ambiance in which it is existing. This movement is determined by the coefficient of thermal expansion of the concrete and the changes in temperature that the structure is subjected to externally. The ratio of development is primarily determined by the aggregates that are used as they make up for 70 to 80 percent of the volume of the concrete.
Higher temperatures can lead to an expansion in concrete, and this can lead to cracks. The overall length of the concrete structure can also lead to additional stresses in the composition. This factor is especially important in bridges. Low temperatures, on the other hand, can lead to shrinkage of the concrete and this can be disrupted if water gets into cracks, leading to ice formation that can cause significant stresses in concrete due to increase in volume.
Impact of Variations of Temperature
Temperature variations can have both negative and positive impact on concrete and its strength. The temperature of the environment in which it is mixed when it is first laid must be under controlled conditions so that the concrete achieves the design strength that it is meant to have. Increased temperatures affect increasing initial power while reducing strength in the long term.
Temperature variations can have effects on different properties of concrete. Early high temperatures affect the later strength of concrete, as this increases the hydration and leads to a non-uniform distribution of the products of hydration. This leads to concentration of products in the area of the hydrating particles and this retards further hydration and affects strength. High temperatures during placing can also increase the voids in concrete, and this can severely affect its durability.
High temperatures also tend to decrease the workability of concrete, and this makes it more difficult for proper consolidation. The fast hydration leads to concrete gaining its initial strength early and difficulties when it is being vibrated and placed. This can lead to the formation of honeycombs in the concrete, which can have a severe effect on the strength of the concrete.
Concrete is best laid at temperatures that are between 5 degrees Centigrade and 40 degrees Centigrade. Any temperatures more than this or lower than this needs special attention to the temperature of the water used in the mixing, and subsequent care while curing the concrete. This process can take years of experience to perfect. When you have a bog project and need professionals, call us, an experienced Frederick concrete company.