| 摘要 |
To accelerate the curing of concrete, heat is applied to a fluid concrete mix substantially uniformily over the outer mix surface. The temperature of the mix is sensed and the application of the heat is terminated when that temperature reaches a predetermined level such that the immediately subsequent exothermic heating within the mix further increases its temperature only to a substantially predetermined maximum value that corresponds to substantially maximum subsequently ultimate compressive strength of the concrete. In one structural embodiment, an electrically energized element is disposed substantially in convective contact with a form in which the mix is received; the element produces heat substantially uniformly over the surface of the form. The heating element is de-energized when the temperature of the form reaches a preselected value. In another structural version, a frame is shaped to mount upon the upper periphery of the sidewalls of a form, a layer of heat-conductive material is carried by the frame in a position to overlie the upper surface of the mix and an electrically energized element is disposed substantially in conductive contact with that layer and produces heat substantially uniformly thereover; another layer of heat-insulating material overlies the heat element. Also disclosed is a flexible blanket that may be placed over the exposed upper surface of a curing concrete mix. The blanket includes one layer of flexible moisture-impervious material substantially reflective to ultraviolet rays and another layer of flexible material substantially reflective to visible light; also preferably included in the blanket is an electrically energized flexible heating element that produces heat uniformly over the surface of the bottom layer.
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