住宅の量産化に関する研究

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Industrial production of building construction has recently been notable for the solution of the problems caused by the housing shortage due to the rapid increase of city poplations. The first step to the industrial production is the planting production of constructual members. Of these the matter of primary importance is nothing but the speedy production of the member (closely related to mass production). From this view point, the existing curing method of concrete products, which requires a considerably long time, is unsuitable. In other words, rapid development of concrete strength is an important point indispensable to the prefabrication of concrete products. This report deals with the research on low pressure (one atmosphere) steam curing method (aboutout 100℃) which is a rapid producting method of concrete products, namely the curing method and the property of steam curing concrete. The outline is as follows, (a) The Curing Method……It is extremely important during the curing process to cover and restrain the external surface of concrete so that no water drip may be mixed, or no volume expansion of concrete may be provoked. The proper period for steam curing necessary from the mixing of concrete to steam curing is about two hours. The rate of temperature rise is found to be hardly effective upon the strength of concrete. In case of thin members (less than 5cm), proper steam curing period is about three hours. The rate of temperature drop after curing should be as slow as possible to get the best results. (b) Property of Steam Curing Concrete……The compressive strength of the concrete cured in the above conditions (ordinary PC, W/C:55%) grew to approximately 200kg/cm^2 in 1 day, which is almost equivalent to the design strength for a structural member. The Tensile strength of concrete which is steam cured, was less than that altained by normal temperature curing. The bond strength, becoming about 22kg/cm^2 in 7days, shows little variation from the one cured at normal temperature, but the drying shrinkage became almost half when atmosphere dried after remolding.
明治大学の論文

住宅の量産化に関する研究

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