The forms are usually left in place as long as the construction schedule allows. Left in place forms usually provide satisfactory protection against moisture loss for formed concrete surfaces. Wet coverings saturated with water should be used after concrete has hardened enough to prevent surface damage. Fogging can minimize plastic shrinkage cracking until the concrete attains final set. Spraying and fogging are used when the ambient temperatures are well above freezing and the humidity is low. Care should be taken to maintain curing water temperature at not more than 20 degrees Fahrenheit cooler than the concrete to prevent cracking due to thermal stresses. Immersion is mainly used in the laboratory for curing concrete test specimens. Ponding is typically used to cure flat surfaces on smaller jobs. There are three main functions of curing:ġ) Maintaining mixing water in concrete during the early hardening process Effect of Curing Temperature on Compressive Strength Effect of curing temperature on compressive strength development is presented in Figure 2.įigure 2. Higher curing temperatures promote an early strength gain in concrete but may decrease its 28-day strength. Moist Curing Time and Compressive Strength Gain
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