Based on the mass-filling concrete of the Guangxi Longmen Bridge anchorage basement (58 606 m3), this paper conducts an online monitoring and analysis of the real thermal field and stress distribution according to the evolution mechanism of the concrete temperature gradient during the pouring period...
Concrete should not be placed when temperatures will drop below 20F. The colder the temperature, the longer it will take concrete to cure. If concrete is placed in weather below 40˚F, use curing blankets to keep the concrete warm during the initial few days of the curing process. ...
Freshly placed concrete exerts pressure on formwork during the placing operation. It is influenced by the rate of placing and the air temperature. For instance, if the concrete pouring rate is too slow, setting of concrete starts to take place. As a result, the concrete at the...
The temperature when the concrete is placed can be somewhat controlled by using cold water for the mix, cooling down aggregates using ice, or pouring at night when temperatures are naturally lower. Concrete Temperature Controlling During Mix Design An effective approach to controlling heat generation...
1.3.1 The Variation of Temperature of Mass Concrete with Time Because of the large size, the variation of temperature in a mass concrete structure is shown in Figure 1.3; the placing temperature Tp is the concrete temperature just after pouring. If the concrete cannot be completely cooled, it...
摘要: KSCE Journal of Civil Engineering - Concrete inevitably gets subjected to the effects of atmospheric wind during pouring. It is a significant factor to predict the temperature stress and gradient...关键词: Hydration heat Fluid-solid coupling Computational fluid dynamics (CFD) Finite element ...
To give the concrete a way to expand and contract during temperature changes, a jointer is used. Jointing divides the concrete, and is usually done in straight lines at regular intervals. When the concrete has dried enough that the water sheen is no longer visible, either give the slab anoth...
Pouring concrete in hot or cold weather is possible when you take the right steps and work quickly. Keep in mind, set times will vary depending on temperature, no matter the time of year. For professionals and homeowners alike, pouring concrete can be a nerve-wracking experience, but it doe...
The strength of concrete is measured in pounds per square inch or kilograms per square centimetre of force needed to crush a sample of a given age or hardness. Concrete’s strength is affected by environmental factors, especially temperature and moisture. If it is allowed to dry prematurely, it...
Concrete’s strength is affected by environmental factors, especially temperature and moisture. If it is allowed to dry prematurely, it can experience unequal tensile stresses that in an imperfectly hardened state cannot be resisted. In the process known as curing, the concrete is kept damp for ...