HOW TO USE IMPERVIOUS PAPER, POLYTHENE SHEET AND HEAT FOR EFFECTIVE CONCRETE CURING? скачать в хорошем качестве

HOW TO USE IMPERVIOUS PAPER, POLYTHENE SHEET AND HEAT FOR EFFECTIVE CONCRETE CURING?

The terms heat curing, heat treatment, accelerated curing, and elevated temperature curing are often used interchangeably to mean a deliberate and defined application of some form of heat on fresh concrete with the intent of promoting rapid cement hydration. The process is a low pressure curing operation conducted in enclosed chambers, tunnels or beds where the precast elements are subjected to some form of heat exposure. Steam and radiant heat sources are often used. Radiant heat may be applied by direct electric heating elements or electric blankets, by circulating warm air around formwork, or by using pipes to circulate hot water, steam or hot oil. Heat curing will improve the productivity and also help to gain strength in the cold climatic regions. Mainly in cold climates this method is useful as compared to water curing because its difficult to maintain the water temperature. Preferably the alternate methods such as covering with polythene sheets or impervious papers will improve the durability of the concrete in cold climates.