Steam Curing
Steam Curing - Related Videos
03:54
Steam Distillation - Concepts
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2020
Steam Distillation Steam distillation is a separation technique that harnesses the low boiling point property of immiscible mixtures. It is predominately used to separate temperature-sensitive organic molecules from a non-volatile contaminant. The organic molecule must be immiscible in water. In steam distillation, the immiscible mixture is heated to boiling, causing the distillation of both water and the volatile organic compounds. This means that the gaseous mixture travels upwards to a...
10:58
Steam Distillation - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Steam DistillationExpand In this experiment, you will perform a steam distillation to extract an essential oil from an orange peel. Before you start the lab, put on the appropriate personal protective equipment, including a lab coat, safety goggles, and gloves. This experiment must be performed in a hood. First, you will need to assemble the steam distillation apparatus. Check the...
03:59
Steam Distillation - Instructor Prep
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2020
Source: Lara Al Hariri at the University of Massachusetts Amherst, MA, USA Preparation of the LaboratoryExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. To begin, put on the appropriate personal protective equipment, including a lab coat, safety goggles, and gloves. Set out the following glassware and equipment that the students will need to build the distillation apparatus (we suggest that...
01:25
Accelerated Curing of Concrete
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2024
Accelerating concrete curing is achieved by applying heat and additional moisture. This process accelerates the hydration of the cement, resulting in an earlier strength gain in the concrete. Steam curing is a method wherein the concrete products are either transported through a chamber on a conveyor belt or encased in plastic, allowing steam at atmospheric pressure to circulate freely around them. This process begins with a phase of moist curing that typically lasts between 3 to 5 hours, after...
01:20
Curing of Concrete
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2024
The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
FAQs
The key mechanism is accelerated cement hydration under simultaneous heat and moisture. Elevated temperature increases the rate at which hydration progresses, while saturated steam or another warm, humid environment supplies the moisture needed during early hardening. Because the concrete does not dry out as readily, the treatment can promote faster early strength development and earlier handling of precast components.
Heating and cooling must be controlled because abrupt temperature changes can create thermal stresses in the concrete. Steam curing therefore depends not only on reaching an elevated temperature, but also on managing the transition into and out of the exposure period. This control helps limit cracking while preserving the intended acceleration in early strength development.
Temperature, exposure time, concrete composition, and the timing of steam application all influence the result. A suitable temperature alone does not guarantee effective curing if exposure is too brief or begins at an unsuitable stage. Engineers evaluate these variables together to obtain consistent early hardening and to coordinate curing with the required production cycle.
A basic steam-curing sequence begins after freshly cast concrete has been prepared for treatment, followed by exposure to saturated steam or a warm, humid environment. The process maintains moisture during elevated-temperature exposure, then uses controlled cooling before the component proceeds to handling or demolding. The exact timing and duration depend on the concrete and production requirements.
The curing environment must provide both elevated temperature and sustained humidity, rather than heat alone. Saturated steam directly supplies these conditions, while a warm, humid environment can serve the same general purpose. In either arrangement, engineers control the exposure conditions and transitions so moisture is maintained and thermal effects remain controlled.
Steam curing is especially valuable where precast production requires rapid turnaround. Faster early strength development can shorten the interval before demolding and help maintain efficient manufacturing cycles. Engineering applications include precast beams, pipes, panels, and other concrete components, where controlled curing also supports more consistent quality across repeated production.