Why does silica fume concrete need to be cured?
Curing is a very important process in the construction of silica fume concrete, which will have an impact on the internal and surface properties, volume stability and many other aspects of hardened concrete.
Maintenance cycle
The maintenance cycle should include the initial pouring, pounding and finishing until the concrete reaches the designed performance. During the construction of concrete, conservation is usually carried out after placing or finishing.
Ordinary environment, due to its relatively slow rate of water evaporation, this maintenance procedure is more reasonable and easy to implement, modern concrete due to the addition of high-efficiency water reducing agents and active fine admixtures, concrete flow, water is easy to evaporate from the surface of the change, and the rate of secretion of concrete and low, evaporated water is difficult to get timely replenishment, therefore, the initial set at the completion of pouring should be maintained.
Maintenance methods
Maintenance methods are covered with water, around the water maintenance, spraying or sprinkling, spray film maintenance, paving film maintenance, etc.. The most commonly used are covering and watering maintenance and film maintenance.
Covering maintenance
Covering with plastic sheeting is to cover all the open surfaces of concrete members with plastic sheeting, and keep the condensed water inside the plastic sheeting not to evaporate outward. When the shape of the surface of the concrete components is not convenient to water and inconvenient to cover the maintenance with plastic sheeting, can be sprayed on the surface of the concrete components film late at night for maintenance layer, in order to prevent the evaporation of water inside the concrete.
Pavement maintenance
Pavement curing is a simple and effective curing method that integrates natural curing, spraying film curing and solar curing, which is applicable to various cast-in-place or precast concrete projects. This curing method is simple, no special spraying equipment or heat collection box, etc.; no separate ingredients, and non-toxic operation; no frequent watering, film can replace sacks and other coverings, can be reused, can improve the early strength, than natural curing can be shortened by half the time.
