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...
A micro-scale finite element method (FEM) was proposed to precisely calculate the heat conduction between mortar and aggregate, and thus to accurately predict the non-uniformity of concrete pouring temperature. The concrete temperature feld during vibration was also precisely calculated by accurate descr...
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...
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...
Concrete curing is an important quality control and quality assurance aspect of all concrete structures. You need to ensure adequate control of moisture and favorable temperature of during concrete pouring. Curing in the right manner will prevent concrete from having excessive drying shrinkage or crackin...
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. ...
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 ...
stress distributions within the age range and provide reasonable and effective control measures for the building of the bridge deck, large commercial software ANSYS is employed to conduct numerical simulation of the temperature field and temperature stress within seven days after the pouring of concrete...
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...
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...